Python2/PyMuPDF: mupdf-source/source/fitz/draw-device.c comparison

comparison mupdf-source/source/fitz/draw-device.c @ 2:b50eed0cc0ef upstream

ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4. The directory name has changed: no version number in the expanded directory now.

author	Franz Glasner <fzglas.hg@dom66.de>
date	Mon, 15 Sep 2025 11:43:07 +0200
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-:1d09e1dec1d9
+:b50eed0cc0ef
+// Copyright (C) 2004-2024 Artifex Software, Inc.
+//
+// This file is part of MuPDF.
+//
+// MuPDF is free software: you can redistribute it and/or modify it under the
+// terms of the GNU Affero General Public License as published by the Free
+// Software Foundation, either version 3 of the License, or (at your option)
+// any later version.
+//
+// MuPDF is distributed in the hope that it will be useful, but WITHOUT ANY
+// WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
+// FOR A PARTICULAR PURPOSE. See the GNU Affero General Public License for more
+// details.
+//
+// You should have received a copy of the GNU Affero General Public License
+// along with MuPDF. If not, see <https://www.gnu.org/licenses/agpl-3.0.en.html>
+//
+// Alternative licensing terms are available from the licensor.
+// For commercial licensing, see <https://www.artifex.com/> or contact
+// Artifex Software, Inc., 39 Mesa Street, Suite 108A, San Francisco,
+// CA 94129, USA, for further information.
+#include "mupdf/fitz.h"
+#include "context-imp.h"
+#include "color-imp.h"
+#include "draw-imp.h"
+#include "glyph-imp.h"
+#include "pixmap-imp.h"
+#include <string.h>
+#include <assert.h>
+#include <math.h>
+#include <float.h>
+#define STACK_SIZE 96
+/* Enable the following to attempt to support knockout and/or isolated
+* blending groups. */
+#define ATTEMPT_KNOCKOUT_AND_ISOLATED
+/* Enable the following to help debug group blending. */
+#undef DUMP_GROUP_BLENDS
+/* Enable the following to help debug graphics stack pushes/pops */
+#undef DUMP_STACK_CHANGES
+enum {
+	FZ_DRAWDEV_FLAGS_TYPE3 = 1,
+};
+typedef struct {
+	fz_irect scissor;
+	fz_pixmap *dest;
+	fz_pixmap *mask;
+	fz_pixmap *shape;
+	fz_pixmap *group_alpha;
+	int blendmode;
+	int id;
+	int doc_id;
+	int encache;
+	float alpha;
+	fz_matrix ctm;
+	float xstep, ystep;
+	fz_irect area;
+	int flags;
+} fz_draw_state;
+typedef struct fz_draw_device
+{
+	fz_device super;
+	fz_matrix transform;
+	fz_rasterizer *rast;
+	fz_default_colorspaces *default_cs;
+	fz_colorspace *proof_cs;
+	int flags;
+	int resolve_spots;
+	int overprint_possible;
+	int top;
+	fz_scale_cache *cache_x;
+	fz_scale_cache *cache_y;
+	fz_draw_state *stack;
+	int stack_cap;
+	fz_draw_state init_stack[STACK_SIZE];
+	fz_shade_color_cache *shade_cache;
+} fz_draw_device;
+#ifdef DUMP_GROUP_BLENDS
+#include <stdio.h>
+static int group_dump_count = 0;
+static void fz_dump_blend(fz_context *ctx, const char *s, fz_pixmap *pix)
+{
+	char name[80];
+	int psd = 0;
+	if (!pix)
+		return;
+	if (pix->s || fz_colorspace_is_subtractive(ctx, pix->colorspace))
+		psd = 1;
+	fz_snprintf(name, sizeof(name), "dump%02d.%s", group_dump_count, psd ? "psd" : "png");
+	printf("%s%02d%s(%p)", s ? s : "", group_dump_count++, psd ? "(PSD)" : "", pix);
+	if (psd)
+		fz_save_pixmap_as_psd(ctx, pix, name);
+	else
+		fz_save_pixmap_as_png(ctx, pix, name);
+}
+static void dump_spaces(int x, const char *s)
+{
+	int i;
+	for (i = 0; i < x; i++)
+		printf(" ");
+	printf("%s", s);
+}
+#endif
+#ifdef DUMP_STACK_CHANGES
+#define STACK_PUSHED(A) stack_change(ctx, dev, '>', A)
+#define STACK_POPPED(A) stack_change(ctx, dev, '<', A)
+#define STACK_CONVERT(A) stack_change(ctx, dev, '=', A)
+static void stack_change(fz_context *ctx, fz_draw_device *dev, int c, const char *s)
+{
+	int n, depth = dev->top;
+	if (c != '<')
+		depth--;
+	n = depth;
+	while (n-- > 0)
+		fputc('\t', stderr);
+	fprintf(stderr, "%c%s (%d)\n", c, s, depth);
+}
+#else
+#define STACK_PUSHED(A) do {} while (0)
+#define STACK_POPPED(A) do {} while (0)
+#define STACK_CONVERT(A) do {} while (0)
+#endif
+/* Logic below assumes that default cs is set to color context cs if there
+* was not a default in the document for that particular cs
+*/
+static fz_colorspace *fz_default_colorspace(fz_context *ctx, fz_default_colorspaces *default_cs, fz_colorspace *cs)
+{
+	if (cs == NULL)
+		return NULL;
+	if (default_cs == NULL)
+		return cs;
+	switch (fz_colorspace_type(ctx, cs))
+	{
+	case FZ_COLORSPACE_GRAY:
+		if (cs == fz_device_gray(ctx))
+			return fz_default_gray(ctx, default_cs);
+		break;
+	case FZ_COLORSPACE_RGB:
+		if (cs == fz_device_rgb(ctx))
+			return fz_default_rgb(ctx, default_cs);
+		break;
+	case FZ_COLORSPACE_CMYK:
+		if (cs == fz_device_cmyk(ctx))
+			return fz_default_cmyk(ctx, default_cs);
+		break;
+	default:
+		break;
+	}
+	return cs;
+}
+static void grow_stack(fz_context *ctx, fz_draw_device *dev)
+{
+	int max = dev->stack_cap * 2;
+	fz_draw_state *stack;
+	if (dev->stack == &dev->init_stack[0])
+	{
+		stack = fz_malloc_array(ctx, max, fz_draw_state);
+		memcpy(stack, dev->stack, sizeof(*stack) * dev->stack_cap);
+	}
+	else
+	{
+		stack = fz_realloc_array(ctx, dev->stack, max, fz_draw_state);
+	}
+	dev->stack = Memento_label(stack, "draw_stack");
+	dev->stack_cap = max;
+}
+/* 'Push' the stack. Returns a pointer to the current state, with state[1]
+* already having been initialised to contain the same thing. Simply
+* change any contents of state[1] that you want to and continue. */
+static fz_draw_state *push_stack(fz_context *ctx, fz_draw_device *dev, const char *message)
+{
+	fz_draw_state *state;
+	if (dev->top == dev->stack_cap-1)
+		grow_stack(ctx, dev);
+	state = &dev->stack[dev->top];
+	dev->top++;
+	memcpy(&state[1], state, sizeof(*state));
+	STACK_PUSHED(message);
+	return state;
+}
+static fz_draw_state *pop_stack(fz_context *ctx, fz_draw_device *dev, const char *message)
+{
+	fz_draw_state *state = &dev->stack[--dev->top];
+	STACK_POPPED(message);
+	return state;
+}
+static void
+cleanup_post_pop(fz_context *ctx, fz_draw_state *state)
+{
+	if (state[0].dest != state[1].dest)
+	{
+		fz_drop_pixmap(ctx, state[1].dest);
+		state[1].dest = NULL;
+	}
+	if (state[0].mask != state[1].mask)
+	{
+		fz_drop_pixmap(ctx, state[1].mask);
+		state[1].mask = NULL;
+	}
+	if (state[1].group_alpha != state[0].group_alpha)
+	{
+		fz_drop_pixmap(ctx, state[1].group_alpha);
+		state[1].group_alpha = NULL;
+	}
+	if (state[1].shape != state[0].shape)
+	{
+		fz_drop_pixmap(ctx, state[1].shape);
+		state[1].shape = NULL;
+	}
+}
+static fz_draw_state *convert_stack(fz_context *ctx, fz_draw_device *dev, const char *message)
+{
+	fz_draw_state *state = &dev->stack[dev->top-1];
+	STACK_CONVERT(message);
+	return state;
+}
+static fz_draw_state *
+fz_knockout_begin(fz_context *ctx, fz_draw_device *dev)
+{
+	fz_irect bbox, ga_bbox;
+	fz_draw_state *state = &dev->stack[dev->top];
+	int isolated = state->blendmode & FZ_BLEND_ISOLATED;
+	if ((state->blendmode & FZ_BLEND_KNOCKOUT) == 0)
+		return state;
+	state = push_stack(ctx, dev, "knockout");
+	bbox = fz_pixmap_bbox(ctx, state->dest);
+	bbox = fz_intersect_irect(bbox, state->scissor);
+	state[1].dest = fz_new_pixmap_with_bbox(ctx, state->dest->colorspace, bbox, state->dest->seps, state->dest->alpha);
+	if (state[0].group_alpha)
+	{
+		ga_bbox = fz_pixmap_bbox(ctx, state->group_alpha);
+		ga_bbox = fz_intersect_irect(ga_bbox, state->scissor);
+		state[1].group_alpha = fz_new_pixmap_with_bbox(ctx, state->group_alpha->colorspace, ga_bbox, state->group_alpha->seps, state->group_alpha->alpha);
+	}
+	if (isolated)
+	{
+		fz_clear_pixmap(ctx, state[1].dest);
+		if (state[1].group_alpha)
+			fz_clear_pixmap(ctx, state[1].group_alpha);
+	}
+	else
+	{
+		/* Find the last but one destination to copy */
+		int i = dev->top-1; /* i = the one on entry (i.e. the last one) */
+		fz_draw_state *prev = state;
+		while (i > 0)
+		{
+			prev = &dev->stack[--i];
+			if (prev->dest != state->dest)
+				break;
+		}
+		if (prev->dest)
+		{
+			fz_copy_pixmap_rect(ctx, state[1].dest, prev->dest, bbox, dev->default_cs);
+			if (state[1].group_alpha)
+			{
+				if (prev->group_alpha)
+					fz_copy_pixmap_rect(ctx, state[1].group_alpha, prev->group_alpha, ga_bbox, dev->default_cs);
+				else
+					fz_clear_pixmap(ctx, state[1].group_alpha);
+			}
+		}
+		else
+		{
+			fz_clear_pixmap(ctx, state[1].dest);
+			if (state[1].group_alpha)
+				fz_clear_pixmap(ctx, state[1].group_alpha);
+		}
+	}
+	/* Knockout groups (and only knockout groups) rely on shape */
+	state[1].shape = fz_new_pixmap_with_bbox(ctx, NULL, bbox, NULL, 1);
+	fz_clear_pixmap(ctx, state[1].shape);
+#ifdef DUMP_GROUP_BLENDS
+	dump_spaces(dev->top-1, "");
+	fz_dump_blend(ctx, "Knockout begin: background is ", state[1].dest);
+	if (state[1].shape)
+		fz_dump_blend(ctx, "/S=", state[1].shape);
+	if (state[1].group_alpha)
+		fz_dump_blend(ctx, "/GA=", state[1].group_alpha);
+	printf("\n");
+#endif
+	state[1].scissor = bbox;
+	state[1].blendmode &= ~(FZ_BLEND_MODEMASK | FZ_BLEND_ISOLATED);
+	return &state[1];
+}
+static void fz_knockout_end(fz_context *ctx, fz_draw_device *dev)
+{
+	fz_draw_state *state;
+	if (dev->top == 0)
+		fz_throw(ctx, FZ_ERROR_ARGUMENT, "unexpected knockout end");
+	state = pop_stack(ctx, dev, "knockout");
+	if ((state[0].blendmode & FZ_BLEND_KNOCKOUT) == 0)
+	{
+		cleanup_post_pop(ctx, state);
+		return;
+	}
+	fz_try(ctx)
+	{
+		assert((state[1].blendmode & FZ_BLEND_ISOLATED) == 0);
+		assert((state[1].blendmode & FZ_BLEND_MODEMASK) == 0);
+		assert(state[1].shape);
+#ifdef DUMP_GROUP_BLENDS
+		dump_spaces(dev->top, "");
+		fz_dump_blend(ctx, "Knockout end: blending ", state[1].dest);
+		if (state[1].shape)
+			fz_dump_blend(ctx, "/S=", state[1].shape);
+		if (state[1].group_alpha)
+			fz_dump_blend(ctx, "/GA=", state[1].group_alpha);
+		fz_dump_blend(ctx, " onto ", state[0].dest);
+		if (state[0].shape)
+			fz_dump_blend(ctx, "/S=", state[0].shape);
+		if (state[0].group_alpha)
+			fz_dump_blend(ctx, "/GA=", state[0].group_alpha);
+		if ((state->blendmode & FZ_BLEND_MODEMASK) != 0)
+			printf(" (blend %d)", state->blendmode & FZ_BLEND_MODEMASK);
+		if ((state->blendmode & FZ_BLEND_ISOLATED) != 0)
+			printf(" (isolated)");
+		printf(" (knockout)");
+#endif
+		fz_blend_pixmap_knockout(ctx, state[0].dest, state[1].dest, state[1].shape);
+		if (state[1].group_alpha && state[0].group_alpha != state[1].group_alpha)
+		{
+			if (state[0].group_alpha)
+				fz_blend_pixmap_knockout(ctx, state[0].group_alpha, state[1].group_alpha, state[1].shape);
+		}
+		if (state[0].shape != state[1].shape)
+		{
+			if (state[0].shape)
+				fz_paint_pixmap(state[0].shape, state[1].shape, 255);
+		}
+#ifdef DUMP_GROUP_BLENDS
+		fz_dump_blend(ctx, " to get ", state[0].dest);
+		if (state[0].shape)
+			fz_dump_blend(ctx, "/S=", state[0].shape);
+		if (state[0].group_alpha)
+			fz_dump_blend(ctx, "/GA=", state[0].group_alpha);
+		printf("\n");
+#endif
+	}
+	fz_always(ctx)
+		cleanup_post_pop(ctx, state);
+	fz_catch(ctx)
+		fz_rethrow(ctx);
+}
+static int
+colors_supported(fz_context *ctx, fz_colorspace *cs, fz_pixmap *dest)
+{
+	/* Even if we support separations in the destination, if the color space has CMY or K as one of
+	 * its colorants and we are in RGB or Gray we will want to do the tint transform */
+	if (!fz_colorspace_is_subtractive(ctx, dest->colorspace) && fz_colorspace_device_n_has_cmyk(ctx, cs))
+		return 0;
+	/* If we have separations then we should support it */
+	if (dest->seps)
+		return 1;
+	/* If our destination is CMYK and the source color space is only C, M, Y or K we support it
+	 * even if we have no seps */
+	if (fz_colorspace_is_subtractive(ctx, dest->colorspace))
+	{
+		int i, n;
+		if (fz_colorspace_device_n_has_only_cmyk(ctx, cs))
+			return 1;
+		n = fz_colorspace_n(ctx, cs);
+		for (i = 0; i < n; i++)
+		{
+			const char *name = fz_colorspace_colorant(ctx, cs, i);
+			if (!name)
+				return 0;
+			if (!strcmp(name, "All"))
+				continue;
+			if (!strcmp(name, "Cyan"))
+				continue;
+			if (!strcmp(name, "Magenta"))
+				continue;
+			if (!strcmp(name, "Yellow"))
+				continue;
+			if (!strcmp(name, "Black"))
+				continue;
+			if (!strcmp(name, "None"))
+				continue;
+			return 0;
+		}
+		return 1;
+	}
+	return 0;
+}
+static fz_overprint *
+set_op_from_spaces(fz_context *ctx, fz_overprint *op, const fz_pixmap *dest, fz_colorspace *src, int opm)
+{
+	int dn, sn, i, j, dc;
+	if (!op)
+		return NULL;
+	if (fz_colorspace_is_indexed(ctx, src))
+		src = fz_base_colorspace(ctx, src);
+	if (!fz_colorspace_is_subtractive(ctx, dest->colorspace))
+		return NULL;
+	if (fz_colorspace_is_gray(ctx, src))
+	{
+		/* gray counts as a CMYK with CMY = 0 */
+	}
+	else if (!fz_colorspace_is_subtractive(ctx, src))
+	{
+		/* The source pixmap was not in a subtractive space, so we can't
+		 * base overprint decisions on that. But we know we've converted
+		 * to a subtractive destination, so we can base overprint
+		 * decisions on what we ended up with. */
+		src = dest->colorspace;
+	}
+	sn = fz_colorspace_n(ctx, src);
+	dn = dest->n - dest->alpha;
+	dc = dn - dest->s;
+	/* If a source colorant is not mentioned in the destination
+	 * colorants (either process or spots), then it will be mapped
+	 * to process colorants. In this case, the process colorants
+	 * can never be protected.
+	 */
+	for (j = 0; j < sn; j++)
+	{
+		/* Run through the colorants looking for one that isn't mentioned.
+		 * i.e. continue if we we find one, break if not. */
+		const char *sname = fz_colorspace_colorant(ctx, src, j);
+		if (!sname)
+			break;
+		if (!strcmp(sname, "All") || !strcmp(sname, "None"))
+			continue;
+		for (i = 0; i < dc; i++)
+		{
+			const char *name = fz_colorspace_colorant(ctx, dest->colorspace, i);
+			if (!name)
+				continue;
+			if (!strcmp(name, sname))
+				break;
+		}
+		if (i != dc)
+			continue;
+		for (; i < dn; i++)
+		{
+			const char *name = fz_separation_name(ctx, dest->seps, i - dc);
+			if (!name)
+				continue;
+			if (!strcmp(name, sname))
+				break;
+		}
+		if (i == dn)
+		{
+			/* This source colorant wasn't mentioned */
+			break;
+		}
+	}
+	if (j == sn)
+	{
+		/* We did not find any source colorants that weren't mentioned, so
+		 * process colorants might not be touched... */
+		for (i = 0; i < dc; i++)
+		{
+			const char *name = fz_colorspace_colorant(ctx, dest->colorspace, i);
+			for (j = 0; j < sn; j++)
+			{
+				const char *sname = fz_colorspace_colorant(ctx, src, j);
+				if (!name || !sname)
+					continue;
+				if (!strcmp(name, sname))
+					break;
+				if (!strcmp(sname, "All"))
+					break;
+			}
+			if (j == sn)
+				fz_set_overprint(op, i);
+		}
+	}
+	for (i = dc; i < dn; i++)
+	{
+		const char *name = fz_separation_name(ctx, dest->seps, i - dc);
+		for (j = 0; j < sn; j++)
+		{
+			const char *sname = fz_colorspace_colorant(ctx, src, j);
+			if (!name || !sname)
+				continue;
+			if (!strcmp(name, sname))
+				break;
+			if (!strcmp(sname, "All"))
+				break;
+		}
+		if (j == sn)
+			fz_set_overprint(op, i);
+	}
+	return op;
+}
+static fz_overprint *
+resolve_color(fz_context *ctx,
+	fz_overprint *op,
+	const float *color,
+	fz_colorspace *colorspace,
+	float alpha,
+	fz_color_params color_params,
+	unsigned char *colorbv,
+	fz_pixmap *dest,
+	int overprint_possible)
+{
+	float colorfv[FZ_MAX_COLORS];
+	int i;
+	int n = dest->n - dest->alpha;
+	fz_colorspace *model = dest->colorspace;
+	int devn, devgray;
+	int effective_opm;
+	if (colorspace == NULL && model != NULL)
+		fz_throw(ctx, FZ_ERROR_ARGUMENT, "color destination requires source color");
+	effective_opm = color_params.opm;
+	devn = fz_colorspace_is_device_n(ctx, colorspace);
+	devgray = fz_colorspace_is_device_gray(ctx, colorspace);
+	/* We can only overprint when enabled, and when we are in a subtractive colorspace */
+	if (color_params.op == 0 || !fz_colorspace_is_subtractive(ctx, dest->colorspace) || !overprint_possible)
+		op = NULL;
+	else if (devgray)
+	{
+		/* Device Gray is additive, but seems to still be
+		 * counted for overprint (see
+		 * Ghent_V3.0/030_Gray_K_black_OP_x1a.pdf 030.pdf). */
+	}
+	/* If we are in a CMYK space (i.e. not a devn one, given we know we are subtractive at this point),
+	 * then we only adhere to overprint mode if it's the same space as the destination. */
+	/* FIXME: Possibly we need a better equivalency test here. */
+	else if (!devn && colorspace != dest->colorspace)
+	{
+		effective_opm = 0;
+	}
+	if (n == 0)
+		i = 0;
+	else if (devn && colors_supported(ctx, colorspace, dest))
+	{
+		fz_convert_separation_colors(ctx, colorspace, color, dest->seps, dest->colorspace, colorfv, color_params);
+		for (i = 0; i < n; i++)
+			colorbv[i] = colorfv[i] * 255;
+		op = set_op_from_spaces(ctx, op, dest, colorspace, effective_opm);
+	}
+	else
+	{
+		int c = n - dest->s;
+		fz_convert_color(ctx, colorspace, color, dest->colorspace, colorfv, NULL, color_params);
+		for (i = 0; i < c; i++)
+			colorbv[i] = colorfv[i] * 255;
+		for (; i < n; i++)
+		{
+			colorfv[i] = 0;
+			colorbv[i] = 0;
+		}
+	}
+	colorbv[i] = alpha * 255;
+	/* op && !devn => overprinting in cmyk or devicegray. */
+	if (op && !devn)
+	{
+		/* We are overprinting, so protect all spots. */
+		for (i = 4; i < n; i++)
+			fz_set_overprint(op, i);
+		/* If OPM, then protect all components for which the color values are zero.
+		 * (but only if we're in devicecmyk). */
+		if (effective_opm == 1 && colorspace != fz_device_gray(ctx))
+			for (i = 0; i < n; i++)
+				if (colorfv[i] == 0)
+					fz_set_overprint(op, i);
+	}
+	return op;
+}
+static fz_draw_state *
+push_group_for_separations(fz_context *ctx, fz_draw_device *dev, fz_color_params color_params, fz_default_colorspaces *default_cs)
+{
+	fz_separations *clone = fz_clone_separations_for_overprint(ctx, dev->stack[0].dest->seps);
+	fz_colorspace *oi = fz_default_output_intent(ctx, default_cs);
+	fz_colorspace *dcs = fz_device_cmyk(ctx);
+	/* Pick sep target CMYK based upon proof and output intent settings.  Priority
+	* is oi, proof, devicecmyk. */
+	if (dev->proof_cs)
+	{
+		dcs = dev->proof_cs;
+	}
+	if (oi)
+	{
+		dcs = oi;
+	}
+	/* Not needed if dest has the seps, and we are not using a proof or the target is the same as the proof and we don't have an oi or the target is the same as the oi */
+	if ((clone == dev->stack[0].dest->seps) && (dev->proof_cs == NULL || dev->proof_cs == dev->stack[0].dest->colorspace) && (oi == NULL || oi == dev->stack[0].dest->colorspace))
+	{
+		fz_drop_separations(ctx, clone);
+		dev->resolve_spots = 0;
+		return &dev->stack[0];
+	}
+	/* Make a new pixmap to render to. */
+	fz_try(ctx)
+	{
+		push_stack(ctx, dev, "separations");
+		dev->stack[1].dest = fz_clone_pixmap_area_with_different_seps(ctx, dev->stack[0].dest, &dev->stack[0].scissor, dcs, clone, color_params, default_cs);
+	}
+	fz_always(ctx)
+		fz_drop_separations(ctx, clone);
+	fz_catch(ctx)
+		fz_rethrow(ctx);
+	return &dev->stack[1];
+}
+static void
+fz_draw_fill_path(fz_context *ctx, fz_device *devp, const fz_path *path, int even_odd, fz_matrix in_ctm,
+	fz_colorspace *colorspace_in, const float *color, float alpha, fz_color_params color_params)
+{
+	fz_draw_device *dev = (fz_draw_device*)devp;
+	fz_matrix ctm = fz_concat(in_ctm, dev->transform);
+	fz_rasterizer *rast = dev->rast;
+	fz_colorspace *colorspace = fz_default_colorspace(ctx, dev->default_cs, colorspace_in);
+	float expansion = fz_matrix_expansion(ctm);
+	float flatness;
+	unsigned char colorbv[FZ_MAX_COLORS + 1];
+	fz_irect bbox;
+	fz_draw_state *state = &dev->stack[dev->top];
+	fz_overprint op = { { 0 } };
+	fz_overprint *eop;
+	if (dev->top == 0 && dev->resolve_spots)
+		state = push_group_for_separations(ctx, dev, color_params, dev->default_cs);
+	if (expansion < FLT_EPSILON)
+		expansion = 1;
+	flatness = 0.3f / expansion;
+	if (flatness < 0.001f)
+		flatness = 0.001f;
+	bbox = fz_intersect_irect(fz_pixmap_bbox(ctx, state->dest), state->scissor);
+	if (fz_flatten_fill_path(ctx, rast, path, ctm, flatness, bbox, &bbox))
+		return;
+	if (alpha == 0)
+		return;
+	if (state->blendmode & FZ_BLEND_KNOCKOUT && alpha != 1)
+		state = fz_knockout_begin(ctx, dev);
+	eop = resolve_color(ctx, &op, color, colorspace, alpha, color_params, colorbv, state->dest, dev->overprint_possible);
+	fz_convert_rasterizer(ctx, rast, even_odd, state->dest, colorbv, eop);
+	if (state->shape)
+	{
+		if (!rast->fns.reusable)
+			fz_flatten_fill_path(ctx, rast, path, ctm, flatness, bbox, NULL);
+		colorbv[0] = 255;
+		fz_convert_rasterizer(ctx, rast, even_odd, state->shape, colorbv, 0);
+	}
+	if (state->group_alpha)
+	{
+		if (!rast->fns.reusable)
+			fz_flatten_fill_path(ctx, rast, path, ctm, flatness, bbox, NULL);
+		colorbv[0] = alpha * 255;
+		fz_convert_rasterizer(ctx, rast, even_odd, state->group_alpha, colorbv, 0);
+	}
+	if (state->blendmode & FZ_BLEND_KNOCKOUT && alpha != 1)
+		fz_knockout_end(ctx, dev);
+}
+static void
+fz_draw_stroke_path(fz_context *ctx, fz_device *devp, const fz_path *path, const fz_stroke_state *stroke, fz_matrix in_ctm,
+	fz_colorspace *colorspace_in, const float *color, float alpha, fz_color_params color_params)
+{
+	fz_draw_device *dev = (fz_draw_device*)devp;
+	fz_matrix ctm = fz_concat(in_ctm, dev->transform);
+	fz_rasterizer *rast = dev->rast;
+	fz_colorspace *colorspace = fz_default_colorspace(ctx, dev->default_cs, colorspace_in);
+	float expansion = fz_matrix_expansion(ctm);
+	float flatness;
+	float linewidth = stroke->linewidth;
+	unsigned char colorbv[FZ_MAX_COLORS + 1];
+	fz_irect bbox;
+	float aa_level = 2.0f/(fz_rasterizer_graphics_aa_level(rast)+2);
+	fz_draw_state *state = &dev->stack[dev->top];
+	float mlw = fz_rasterizer_graphics_min_line_width(rast);
+	fz_overprint op = { { 0 } };
+	fz_overprint *eop;
+	if (dev->top == 0 && dev->resolve_spots)
+		state = push_group_for_separations(ctx, dev, color_params, dev->default_cs);
+	if (mlw > aa_level)
+		aa_level = mlw;
+	if (expansion < FLT_EPSILON)
+		expansion = 1;
+	if (linewidth * expansion < aa_level)
+		linewidth = aa_level / expansion;
+	flatness = 0.3f / expansion;
+	if (flatness < 0.001f)
+		flatness = 0.001f;
+	bbox = fz_intersect_irect(fz_pixmap_bbox_no_ctx(state->dest), state->scissor);
+	if (fz_flatten_stroke_path(ctx, rast, path, stroke, ctm, flatness, linewidth, bbox, &bbox))
+		return;
+	if (alpha == 0)
+		return;
+	if (state->blendmode & FZ_BLEND_KNOCKOUT && alpha != 1)
+		state = fz_knockout_begin(ctx, dev);
+	eop = resolve_color(ctx, &op, color, colorspace, alpha, color_params, colorbv, state->dest, dev->overprint_possible);
+#ifdef DUMP_GROUP_BLENDS
+	dump_spaces(dev->top, "");
+	fz_dump_blend(ctx, "Before stroke ", state->dest);
+	if (state->shape)
+		fz_dump_blend(ctx, "/S=", state->shape);
+	if (state->group_alpha)
+		fz_dump_blend(ctx, "/GA=", state->group_alpha);
+	printf("\n");
+#endif
+	fz_convert_rasterizer(ctx, rast, 0, state->dest, colorbv, eop);
+	if (state->shape)
+	{
+		if (!rast->fns.reusable)
+			(void)fz_flatten_stroke_path(ctx, rast, path, stroke, ctm, flatness, linewidth, bbox, NULL);
+		colorbv[0] = 255;
+		fz_convert_rasterizer(ctx, rast, 0, state->shape, colorbv, 0);
+	}
+	if (state->group_alpha)
+	{
+		if (!rast->fns.reusable)
+			(void)fz_flatten_stroke_path(ctx, rast, path, stroke, ctm, flatness, linewidth, bbox, NULL);
+		colorbv[0] = 255 * alpha;
+		fz_convert_rasterizer(ctx, rast, 0, state->group_alpha, colorbv, 0);
+	}
+#ifdef DUMP_GROUP_BLENDS
+	dump_spaces(dev->top, "");
+	fz_dump_blend(ctx, "After stroke ", state->dest);
+	if (state->shape)
+		fz_dump_blend(ctx, "/S=", state->shape);
+	if (state->group_alpha)
+		fz_dump_blend(ctx, "/GA=", state->group_alpha);
+	printf("\n");
+#endif
+	if (state->blendmode & FZ_BLEND_KNOCKOUT && alpha != 1)
+		fz_knockout_end(ctx, dev);
+}
+static void
+fz_draw_clip_path(fz_context *ctx, fz_device *devp, const fz_path *path, int even_odd, fz_matrix in_ctm, fz_rect scissor)
+{
+	fz_draw_device *dev = (fz_draw_device*)devp;
+	fz_matrix ctm = fz_concat(in_ctm, dev->transform);
+	fz_rasterizer *rast = dev->rast;
+	float expansion = fz_matrix_expansion(ctm);
+	float flatness;
+	fz_irect bbox;
+	fz_draw_state *state = &dev->stack[dev->top];
+	fz_colorspace *model;
+	if (dev->top == 0 && dev->resolve_spots)
+		state = push_group_for_separations(ctx, dev, fz_default_color_params /* FIXME */, dev->default_cs);
+	if (expansion < FLT_EPSILON)
+		expansion = 1;
+	flatness = 0.3f / expansion;
+	if (flatness < 0.001f)
+		flatness = 0.001f;
+	state = push_stack(ctx, dev, "clip path");
+	model = state->dest->colorspace;
+	bbox = fz_intersect_irect(fz_pixmap_bbox(ctx, state->dest), state->scissor);
+	if (!fz_is_infinite_rect(scissor))
+		bbox = fz_intersect_irect(bbox, fz_irect_from_rect(fz_transform_rect(scissor, dev->transform)));
+	if (fz_flatten_fill_path(ctx, rast, path, ctm, flatness, bbox, &bbox) || fz_is_rect_rasterizer(ctx, rast))
+	{
+		state[1].scissor = bbox;
+		state[1].mask = NULL;
+#ifdef DUMP_GROUP_BLENDS
+		dump_spaces(dev->top-1, "Clip (rectangular) begin\n");
+#endif
+		return;
+	}
+	state[1].mask = fz_new_pixmap_with_bbox(ctx, NULL, bbox, NULL, 1);
+	fz_clear_pixmap(ctx, state[1].mask);
+	state[1].dest = fz_new_pixmap_with_bbox(ctx, model, bbox, state[0].dest->seps, state[0].dest->alpha);
+	fz_copy_pixmap_rect(ctx, state[1].dest, state[0].dest, bbox, dev->default_cs);
+	if (state[1].shape)
+	{
+		state[1].shape = fz_new_pixmap_with_bbox(ctx, NULL, bbox, NULL, 1);
+		fz_copy_pixmap_rect(ctx, state[1].shape, state[0].shape, bbox, dev->default_cs);
+	}
+	if (state[1].group_alpha)
+	{
+		state[1].group_alpha = fz_new_pixmap_with_bbox(ctx, NULL, bbox, NULL, 1);
+		fz_copy_pixmap_rect(ctx, state[1].group_alpha, state[0].group_alpha, bbox, dev->default_cs);
+	}
+	fz_convert_rasterizer(ctx, rast, even_odd, state[1].mask, NULL, 0);
+	state[1].scissor = bbox;
+#ifdef DUMP_GROUP_BLENDS
+	dump_spaces(dev->top-1, "Clip (non-rectangular) begin\n");
+#endif
+}
+static void
+fz_draw_clip_stroke_path(fz_context *ctx, fz_device *devp, const fz_path *path, const fz_stroke_state *stroke, fz_matrix in_ctm, fz_rect scissor)
+{
+	fz_draw_device *dev = (fz_draw_device*)devp;
+	fz_matrix ctm = fz_concat(in_ctm, dev->transform);
+	fz_rasterizer *rast = dev->rast;
+	float expansion = fz_matrix_expansion(ctm);
+	float flatness;
+	float linewidth = stroke->linewidth;
+	fz_irect bbox;
+	fz_draw_state *state = &dev->stack[dev->top];
+	fz_colorspace *model;
+	float aa_level = 2.0f/(fz_rasterizer_graphics_aa_level(rast)+2);
+	float mlw = fz_rasterizer_graphics_min_line_width(rast);
+	if (dev->top == 0 && dev->resolve_spots)
+		state = push_group_for_separations(ctx, dev, fz_default_color_params /* FIXME */, dev->default_cs);
+	if (mlw > aa_level)
+		aa_level = mlw;
+	if (expansion < FLT_EPSILON)
+		expansion = 1;
+	if (linewidth * expansion < aa_level)
+		linewidth = aa_level / expansion;
+	flatness = 0.3f / expansion;
+	if (flatness < 0.001f)
+		flatness = 0.001f;
+	state = push_stack(ctx, dev, "clip stroke");
+	model = state->dest->colorspace;
+	bbox = fz_intersect_irect(fz_pixmap_bbox(ctx, state->dest), state->scissor);
+	if (!fz_is_infinite_rect(scissor))
+		bbox = fz_intersect_irect(bbox, fz_irect_from_rect(fz_transform_rect(scissor, dev->transform)));
+	if (fz_flatten_stroke_path(ctx, rast, path, stroke, ctm, flatness, linewidth, bbox, &bbox))
+	{
+		state[1].scissor = bbox;
+		state[1].mask = NULL;
+#ifdef DUMP_GROUP_BLENDS
+		dump_spaces(dev->top-1, "Clip (stroke, empty) begin\n");
+#endif
+		return;
+	}
+	state[1].mask = fz_new_pixmap_with_bbox(ctx, NULL, bbox, NULL, 1);
+	fz_clear_pixmap(ctx, state[1].mask);
+	state[1].dest = fz_new_pixmap_with_bbox(ctx, model, bbox, state[0].dest->seps, state[0].dest->alpha);
+	fz_copy_pixmap_rect(ctx, state[1].dest, state[0].dest, bbox, dev->default_cs);
+	if (state->shape)
+	{
+		state[1].shape = fz_new_pixmap_with_bbox(ctx, NULL, bbox, NULL, 1);
+		fz_copy_pixmap_rect(ctx, state[1].shape, state[0].shape, bbox, dev->default_cs);
+	}
+	if (state->group_alpha)
+	{
+		state[1].group_alpha = fz_new_pixmap_with_bbox(ctx, NULL, bbox, NULL, 1);
+		fz_copy_pixmap_rect(ctx, state[1].group_alpha, state[0].group_alpha, bbox, dev->default_cs);
+	}
+	fz_convert_rasterizer(ctx, rast, 0, state[1].mask, NULL, 0);
+	state[1].blendmode |= FZ_BLEND_ISOLATED;
+	state[1].scissor = bbox;
+#ifdef DUMP_GROUP_BLENDS
+	dump_spaces(dev->top-1, "Clip (stroke) begin\n");
+#endif
+}
+static void
+draw_glyph(unsigned char *colorbv, fz_pixmap *dst, fz_glyph *glyph,
+	int xorig, int yorig, const fz_irect *scissor, fz_overprint *eop)
+{
+	unsigned char *dp;
+	fz_irect bbox;
+	int x, y, w, h;
+	int skip_x, skip_y;
+	fz_pixmap *msk;
+	bbox = fz_glyph_bbox_no_ctx(glyph);
+	bbox = fz_translate_irect(bbox, xorig, yorig);
+	bbox = fz_intersect_irect(bbox, *scissor); /* scissor < dst */
+	bbox = fz_intersect_irect(bbox, fz_pixmap_bbox_no_ctx(dst));
+	if (fz_is_empty_irect(bbox))
+		return;
+	x = bbox.x0;
+	y = bbox.y0;
+	w = bbox.x1 - bbox.x0;
+	h = bbox.y1 - bbox.y0;
+	skip_x = x - glyph->x - xorig;
+	skip_y = y - glyph->y - yorig;
+	msk = glyph->pixmap;
+	dp = dst->samples + (y - dst->y) * (size_t)dst->stride + (x - dst->x) * (size_t)dst->n;
+	if (msk == NULL)
+	{
+		fz_paint_glyph(colorbv, dst, dp, glyph, w, h, skip_x, skip_y, eop);
+	}
+	else
+	{
+		unsigned char *mp = msk->samples + skip_y * msk->stride + skip_x;
+		int da = dst->alpha;
+		if (dst->colorspace)
+		{
+			fz_span_color_painter_t *fn;
+			fn = fz_get_span_color_painter(dst->n, da, colorbv, eop);
+			if (fn == NULL)
+				return;
+			while (h--)
+			{
+				(*fn)(dp, mp, dst->n, w, colorbv, da, eop);
+				dp += dst->stride;
+				mp += msk->stride;
+			}
+		}
+		else
+		{
+			fz_span_painter_t *fn;
+			int col = colorbv ? colorbv[0] : 255;
+			fn = fz_get_span_painter(da, 1, 0, col, eop);
+			if (fn == NULL)
+				return;
+			while (h--)
+			{
+				(*fn)(dp, da, mp, 1, 0, w, col, eop);
+				dp += dst->stride;
+				mp += msk->stride;
+			}
+		}
+	}
+}
+static void
+fz_draw_fill_text(fz_context *ctx, fz_device *devp, const fz_text *text, fz_matrix in_ctm,
+	fz_colorspace *colorspace_in, const float *color, float alpha, fz_color_params color_params)
+{
+	fz_draw_device *dev = (fz_draw_device*)devp;
+	fz_matrix ctm = fz_concat(in_ctm, dev->transform);
+	fz_draw_state *state = &dev->stack[dev->top];
+	fz_colorspace *model = state->dest->colorspace;
+	unsigned char colorbv[FZ_MAX_COLORS + 1];
+	unsigned char shapebv, shapebva;
+	fz_text_span *span;
+	int i;
+	fz_colorspace *colorspace = NULL;
+	fz_rasterizer *rast = dev->rast;
+	fz_overprint op = { { 0 } };
+	fz_overprint *eop;
+	if (dev->top == 0 && dev->resolve_spots)
+		state = push_group_for_separations(ctx, dev, color_params, dev->default_cs);
+	if (colorspace_in)
+		colorspace = fz_default_colorspace(ctx, dev->default_cs, colorspace_in);
+	if (colorspace == NULL && model != NULL)
+		fz_throw(ctx, FZ_ERROR_ARGUMENT, "color destination requires source color");
+	if (alpha == 0)
+		return;
+	if (state->blendmode & FZ_BLEND_KNOCKOUT && alpha != 1)
+		state = fz_knockout_begin(ctx, dev);
+	eop = resolve_color(ctx, &op, color, colorspace, alpha, color_params, colorbv, state->dest, dev->overprint_possible);
+	shapebv = 255;
+	shapebva = 255 * alpha;
+	for (span = text->head; span; span = span->next)
+	{
+		fz_matrix tm, trm;
+		fz_glyph *glyph;
+		int gid;
+		tm = span->trm;
+		for (i = 0; i < span->len; i++)
+		{
+			gid = span->items[i].gid;
+			if (gid < 0)
+				continue;
+			tm.e = span->items[i].x;
+			tm.f = span->items[i].y;
+			trm = fz_concat(tm, ctm);
+			glyph = fz_render_glyph(ctx, span->font, gid, &trm, model, &state->scissor, state->dest->alpha, fz_rasterizer_text_aa_level(rast));
+			if (glyph)
+			{
+				fz_pixmap *pixmap = glyph->pixmap;
+				int x = floorf(trm.e);
+				int y = floorf(trm.f);
+				if (pixmap == NULL || pixmap->n == 1)
+				{
+					draw_glyph(colorbv, state->dest, glyph, x, y, &state->scissor, eop);
+					if (state->shape)
+						draw_glyph(&shapebv, state->shape, glyph, x, y, &state->scissor, 0);
+					if (state->group_alpha)
+						draw_glyph(&shapebva, state->group_alpha, glyph, x, y, &state->scissor, 0);
+				}
+				else
+				{
+					fz_matrix mat;
+					mat.a = pixmap->w; mat.b = mat.c = 0; mat.d = pixmap->h;
+					mat.e = x + pixmap->x; mat.f = y + pixmap->y;
+					mat = fz_gridfit_matrix(devp->flags & FZ_DEVFLAG_GRIDFIT_AS_TILED, mat);
+					fz_paint_image(ctx, state->dest, &state->scissor, state->shape, state->group_alpha, pixmap, mat, alpha * 255, !(devp->hints & FZ_DONT_INTERPOLATE_IMAGES), eop);
+				}
+				fz_drop_glyph(ctx, glyph);
+			}
+			else
+			{
+				fz_path *path = fz_outline_glyph(ctx, span->font, gid, tm);
+				if (path)
+				{
+					fz_try(ctx)
+						fz_draw_fill_path(ctx, devp, path, 0, in_ctm, colorspace, color, alpha, color_params);
+					fz_always(ctx)
+						fz_drop_path(ctx, path);
+					fz_catch(ctx)
+						fz_rethrow(ctx);
+				}
+				else
+				{
+					fz_warn(ctx, "cannot render glyph");
+				}
+			}
+		}
+	}
+	if (state->blendmode & FZ_BLEND_KNOCKOUT && alpha != 1)
+		fz_knockout_end(ctx, dev);
+}
+static void
+fz_draw_stroke_text(fz_context *ctx, fz_device *devp, const fz_text *text, const fz_stroke_state *stroke,
+	fz_matrix in_ctm, fz_colorspace *colorspace_in, const float *color, float alpha, fz_color_params color_params)
+{
+	fz_draw_device *dev = (fz_draw_device*)devp;
+	fz_matrix ctm = fz_concat(in_ctm, dev->transform);
+	fz_draw_state *state = &dev->stack[dev->top];
+	fz_colorspace *model = state->dest->colorspace;
+	unsigned char colorbv[FZ_MAX_COLORS + 1];
+	unsigned char solid = 255;
+	unsigned char alpha_byte = alpha * 255;
+	fz_text_span *span;
+	int i;
+	fz_colorspace *colorspace = NULL;
+	int aa = fz_rasterizer_text_aa_level(dev->rast);
+	fz_overprint op = { { 0 } };
+	fz_overprint *eop;
+	if (dev->top == 0 && dev->resolve_spots)
+		state = push_group_for_separations(ctx, dev, color_params, dev->default_cs);
+	if (colorspace_in)
+		colorspace = fz_default_colorspace(ctx, dev->default_cs, colorspace_in);
+	if (alpha == 0)
+		return;
+	if (state->blendmode & FZ_BLEND_KNOCKOUT && alpha != 1)
+		state = fz_knockout_begin(ctx, dev);
+	eop = resolve_color(ctx, &op, color, colorspace, alpha, color_params, colorbv, state->dest, dev->overprint_possible);
+	for (span = text->head; span; span = span->next)
+	{
+		fz_matrix tm, trm;
+		fz_glyph *glyph;
+		int gid;
+		tm = span->trm;
+		for (i = 0; i < span->len; i++)
+		{
+			gid = span->items[i].gid;
+			if (gid < 0)
+				continue;
+			tm.e = span->items[i].x;
+			tm.f = span->items[i].y;
+			trm = fz_concat(tm, ctm);
+			glyph = fz_render_stroked_glyph(ctx, span->font, gid, &trm, ctm, model, stroke, &state->scissor, aa);
+			if (glyph)
+			{
+				fz_pixmap *pixmap = glyph->pixmap;
+				int x = (int)trm.e;
+				int y = (int)trm.f;
+				if (pixmap == NULL || pixmap->n == 1)
+				{
+					draw_glyph(colorbv, state->dest, glyph, x, y, &state->scissor, eop);
+					if (state->shape)
+						draw_glyph(&solid, state->shape, glyph, x, y, &state->scissor, 0);
+					if (state->group_alpha)
+						draw_glyph(&alpha_byte, state->group_alpha, glyph, x, y, &state->scissor, 0);
+				}
+				else
+				{
+					fz_matrix mat;
+					mat.a = pixmap->w; mat.b = mat.c = 0; mat.d = pixmap->h;
+					mat.e = x + pixmap->x; mat.f = y + pixmap->y;
+					mat = fz_gridfit_matrix(devp->flags & FZ_DEVFLAG_GRIDFIT_AS_TILED, mat);
+					fz_paint_image(ctx, state->dest, &state->scissor, state->shape, state->group_alpha, pixmap, mat, alpha * 255, !(devp->hints & FZ_DONT_INTERPOLATE_IMAGES), eop);
+				}
+				fz_drop_glyph(ctx, glyph);
+			}
+			else
+			{
+				fz_path *path = fz_outline_glyph(ctx, span->font, gid, tm);
+				if (!path)
+					fz_warn(ctx, "cannot render glyph");
+				else
+				{
+					fz_try(ctx)
+						fz_draw_stroke_path(ctx, devp, path, stroke, in_ctm, colorspace, color, alpha, color_params);
+					fz_always(ctx)
+						fz_drop_path(ctx, path);
+					fz_catch(ctx)
+						fz_rethrow(ctx);
+				}
+			}
+		}
+	}
+	if (state->blendmode & FZ_BLEND_KNOCKOUT && alpha != 1)
+		fz_knockout_end(ctx, dev);
+}
+static void
+fz_draw_clip_text(fz_context *ctx, fz_device *devp, const fz_text *text, fz_matrix in_ctm, fz_rect scissor)
+{
+	fz_draw_device *dev = (fz_draw_device*)devp;
+	fz_matrix ctm = fz_concat(in_ctm, dev->transform);
+	fz_irect bbox;
+	fz_matrix tm, trm;
+	fz_glyph *glyph;
+	int i, gid;
+	fz_draw_state *state;
+	fz_colorspace *model;
+	fz_text_span *span;
+	fz_rasterizer *rast = dev->rast;
+	if (dev->top == 0 && dev->resolve_spots)
+		state = push_group_for_separations(ctx, dev, fz_default_color_params /* FIXME */, dev->default_cs);
+	state = push_stack(ctx, dev, "clip text");
+	model = state->dest->colorspace;
+	/* make the mask the exact size needed */
+	bbox = fz_irect_from_rect(fz_bound_text(ctx, text, NULL, ctm));
+	bbox = fz_intersect_irect(bbox, state->scissor);
+	if (!fz_is_infinite_rect(scissor))
+	{
+		fz_rect tscissor = fz_transform_rect(scissor, dev->transform);
+		bbox = fz_intersect_irect(bbox, fz_irect_from_rect(tscissor));
+	}
+	state[1].mask = fz_new_pixmap_with_bbox(ctx, NULL, bbox, NULL, 1);
+	fz_clear_pixmap(ctx, state[1].mask);
+	/* When there is no alpha in the current destination (state[0].dest->alpha == 0)
+	 * we have a choice. We can either create the new destination WITH alpha, or
+	 * we can copy the old pixmap contents in. We opt for the latter here, but
+	 * may want to revisit this decision in the future. */
+	state[1].dest = fz_new_pixmap_with_bbox(ctx, model, bbox, state[0].dest->seps, state[0].dest->alpha);
+	if (state[0].dest->alpha)
+		fz_clear_pixmap(ctx, state[1].dest);
+	else
+		fz_copy_pixmap_rect(ctx, state[1].dest, state[0].dest, bbox, dev->default_cs);
+	if (state->shape)
+	{
+		state[1].shape = fz_new_pixmap_with_bbox(ctx, NULL, bbox, NULL, 1);
+		fz_copy_pixmap_rect(ctx, state[1].shape, state[0].shape, bbox, dev->default_cs);
+	}
+	else
+		state[1].shape = NULL;
+	if (state->group_alpha)
+	{
+		state[1].group_alpha = fz_new_pixmap_with_bbox(ctx, NULL, bbox, NULL, 1);
+		fz_copy_pixmap_rect(ctx, state[1].group_alpha, state[0].group_alpha, bbox, dev->default_cs);
+	}
+	else
+		state[1].group_alpha = NULL;
+	state[1].blendmode |= FZ_BLEND_ISOLATED;
+	state[1].scissor = bbox;
+#ifdef DUMP_GROUP_BLENDS
+	dump_spaces(dev->top-1, "Clip (text) begin\n");
+#endif
+	if (!fz_is_empty_irect(bbox) && state[1].mask)
+	{
+		for (span = text->head; span; span = span->next)
+		{
+			tm = span->trm;
+			for (i = 0; i < span->len; i++)
+			{
+				gid = span->items[i].gid;
+				if (gid < 0)
+					continue;
+				tm.e = span->items[i].x;
+				tm.f = span->items[i].y;
+				trm = fz_concat(tm, ctm);
+				glyph = fz_render_glyph(ctx, span->font, gid, &trm, model, &state->scissor, state[1].dest->alpha, fz_rasterizer_text_aa_level(rast));
+				if (glyph)
+				{
+					int x = (int)trm.e;
+					int y = (int)trm.f;
+					draw_glyph(NULL, state[1].mask, glyph, x, y, &bbox, 0);
+					if (state[1].shape)
+						draw_glyph(NULL, state[1].shape, glyph, x, y, &bbox, 0);
+					if (state[1].group_alpha)
+						draw_glyph(NULL, state[1].group_alpha, glyph, x, y, &bbox, 0);
+					fz_drop_glyph(ctx, glyph);
+				}
+				else
+				{
+					fz_path *path = fz_outline_glyph(ctx, span->font, gid, tm);
+					if (path)
+					{
+						fz_pixmap *old_dest;
+						float white = 1;
+						old_dest = state[1].dest;
+						state[1].dest = state[1].mask;
+						state[1].mask = NULL;
+						fz_try(ctx)
+						{
+							fz_draw_fill_path(ctx, devp, path, 0, in_ctm, fz_device_gray(ctx), &white, 1, fz_default_color_params);
+						}
+						fz_always(ctx)
+						{
+							state[1].mask = state[1].dest;
+							state[1].dest = old_dest;
+							fz_drop_path(ctx, path);
+						}
+						fz_catch(ctx)
+						{
+							fz_rethrow(ctx);
+						}
+					}
+					else
+					{
+						fz_warn(ctx, "cannot render glyph for clipping");
+					}
+				}
+			}
+		}
+	}
+}
+static void
+fz_draw_clip_stroke_text(fz_context *ctx, fz_device *devp, const fz_text *text, const fz_stroke_state *stroke, fz_matrix in_ctm, fz_rect scissor)
+{
+	fz_draw_device *dev = (fz_draw_device*)devp;
+	fz_matrix ctm = fz_concat(in_ctm, dev->transform);
+	fz_irect bbox;
+	fz_pixmap *mask, *shape, *group_alpha;
+	fz_matrix tm, trm;
+	fz_glyph *glyph;
+	int i, gid;
+	fz_draw_state *state = push_stack(ctx, dev, "clip stroke text");
+	fz_colorspace *model = state->dest->colorspace;
+	fz_text_span *span;
+	int aa = fz_rasterizer_text_aa_level(dev->rast);
+	if (dev->top == 0 && dev->resolve_spots)
+		state = push_group_for_separations(ctx, dev, fz_default_color_params /* FIXME */, dev->default_cs);
+	/* make the mask the exact size needed */
+	bbox = fz_irect_from_rect(fz_bound_text(ctx, text, stroke, ctm));
+	bbox = fz_intersect_irect(bbox, state->scissor);
+	if (!fz_is_infinite_rect(scissor))
+	{
+		fz_rect tscissor = fz_transform_rect(scissor, dev->transform);
+		bbox = fz_intersect_irect(bbox, fz_irect_from_rect(tscissor));
+	}
+	state[1].mask = mask = fz_new_pixmap_with_bbox(ctx, NULL, bbox, NULL, 1);
+	fz_clear_pixmap(ctx, mask);
+	/* When there is no alpha in the current destination (state[0].dest->alpha == 0)
+	 * we have a choice. We can either create the new destination WITH alpha, or
+	 * we can copy the old pixmap contents in. We opt for the latter here, but
+	 * may want to revisit this decision in the future. */
+	state[1].dest = fz_new_pixmap_with_bbox(ctx, model, bbox, state[0].dest->seps, state[0].dest->alpha);
+	if (state[0].dest->alpha)
+		fz_clear_pixmap(ctx, state[1].dest);
+	else
+		fz_copy_pixmap_rect(ctx, state[1].dest, state[0].dest, bbox, dev->default_cs);
+	if (state->shape)
+	{
+		state[1].shape = shape = fz_new_pixmap_with_bbox(ctx, NULL, bbox, NULL, 1);
+		fz_copy_pixmap_rect(ctx, state[1].shape, state[0].shape, bbox, dev->default_cs);
+	}
+	else
+		shape = state->shape;
+	if (state->group_alpha)
+	{
+		state[1].group_alpha = group_alpha = fz_new_pixmap_with_bbox(ctx, NULL, bbox, NULL, 1);
+		fz_copy_pixmap_rect(ctx, state[1].group_alpha, state[0].group_alpha, bbox, dev->default_cs);
+	}
+	else
+		group_alpha = NULL;
+	state[1].blendmode |= FZ_BLEND_ISOLATED;
+	state[1].scissor = bbox;
+#ifdef DUMP_GROUP_BLENDS
+	dump_spaces(dev->top-1, "Clip (stroke text) begin\n");
+#endif
+	if (!fz_is_empty_irect(bbox))
+	{
+		for (span = text->head; span; span = span->next)
+		{
+			tm = span->trm;
+			for (i = 0; i < span->len; i++)
+			{
+				gid = span->items[i].gid;
+				if (gid < 0)
+					continue;
+				tm.e = span->items[i].x;
+				tm.f = span->items[i].y;
+				trm = fz_concat(tm, ctm);
+				glyph = fz_render_stroked_glyph(ctx, span->font, gid, &trm, ctm, model, stroke, &state->scissor, aa);
+				if (glyph)
+				{
+					int x = (int)trm.e;
+					int y = (int)trm.f;
+					draw_glyph(NULL, mask, glyph, x, y, &bbox, 0);
+					if (shape)
+						draw_glyph(NULL, shape, glyph, x, y, &bbox, 0);
+					if (group_alpha)
+						draw_glyph(NULL, group_alpha, glyph, x, y, &bbox, 0);
+					fz_drop_glyph(ctx, glyph);
+				}
+				else
+				{
+					fz_path *path = fz_outline_glyph(ctx, span->font, gid, tm);
+					if (path)
+					{
+						fz_pixmap *old_dest;
+						float white = 1;
+						state = &dev->stack[dev->top];
+						old_dest = state[0].dest;
+						state[0].dest = state[0].mask;
+						state[0].mask = NULL;
+						fz_try(ctx)
+						{
+							fz_draw_stroke_path(ctx, devp, path, stroke, in_ctm, fz_device_gray(ctx), &white, 1, fz_default_color_params);
+						}
+						fz_always(ctx)
+						{
+							state[0].mask = state[0].dest;
+							state[0].dest = old_dest;
+							fz_drop_path(ctx, path);
+						}
+						fz_catch(ctx)
+						{
+							fz_rethrow(ctx);
+						}
+					}
+					else
+					{
+						fz_warn(ctx, "cannot render glyph for stroked clipping");
+					}
+				}
+			}
+		}
+	}
+}
+static void
+fz_draw_ignore_text(fz_context *ctx, fz_device *dev, const fz_text *text, fz_matrix ctm)
+{
+}
+static void
+fz_draw_fill_shade(fz_context *ctx, fz_device *devp, fz_shade *shade, fz_matrix in_ctm, float alpha, fz_color_params color_params)
+{
+	fz_draw_device *dev = (fz_draw_device*)devp;
+	fz_matrix ctm = fz_concat(in_ctm, dev->transform);
+	fz_irect bbox, scissor;
+	fz_pixmap *dest, *shape, *group_alpha;
+	unsigned char colorbv[FZ_MAX_COLORS + 1];
+	unsigned char alpha_byte = 255 * alpha;
+	fz_draw_state *state = &dev->stack[dev->top];
+	fz_overprint op = { { 0 } };
+	fz_overprint *eop;
+	fz_colorspace *colorspace = fz_default_colorspace(ctx, dev->default_cs, shade->colorspace);
+	if (dev->top == 0 && dev->resolve_spots)
+		state = push_group_for_separations(ctx, dev, color_params, dev->default_cs);
+	scissor = state->scissor;
+	bbox = fz_irect_from_rect(fz_bound_shade(ctx, shade, ctm));
+	bbox = fz_intersect_irect(bbox, scissor);
+	if (fz_is_empty_irect(bbox))
+		return;
+	if (alpha == 0)
+		return;
+	if (state->blendmode & FZ_BLEND_KNOCKOUT && alpha != 1)
+		state = fz_knockout_begin(ctx, dev);
+	fz_var(dest);
+	fz_var(shape);
+	fz_var(group_alpha);
+	dest = state->dest;
+	shape = state->shape;
+	group_alpha = state->group_alpha;
+	fz_try(ctx)
+	{
+		if (alpha < 1)
+		{
+			dest = fz_new_pixmap_with_bbox(ctx, state->dest->colorspace, bbox, state->dest->seps, state->dest->alpha);
+			if (state->dest->alpha)
+				fz_clear_pixmap(ctx, dest);
+			else
+				fz_copy_pixmap_rect(ctx, dest, state[0].dest, bbox, dev->default_cs);
+			if (shape)
+			{
+				shape = fz_new_pixmap_with_bbox(ctx, NULL, bbox, NULL, 1);
+				fz_clear_pixmap(ctx, shape);
+			}
+			if (group_alpha)
+			{
+				group_alpha = fz_new_pixmap_with_bbox(ctx, NULL, bbox, NULL, 1);
+				fz_clear_pixmap(ctx, group_alpha);
+			}
+		}
+		if (shade->use_background)
+		{
+			unsigned char *s;
+			int x, y, n, i;
+			/* Disable OPM */
+			color_params.opm = 0;
+			eop = resolve_color(ctx, &op, shade->background, colorspace, alpha, color_params, colorbv, state->dest, dev->overprint_possible);
+			n = dest->n;
+			if (fz_overprint_required(eop))
+			{
+				for (y = scissor.y0; y < scissor.y1; y++)
+				{
+					s = dest->samples + (unsigned int)((y - dest->y) * dest->stride + (scissor.x0 - dest->x) * n);
+					for (x = scissor.x0; x < scissor.x1; x++)
+					{
+						for (i = 0; i < n; i++)
+							if (fz_overprint_component(eop, i))
+								*s++ = colorbv[i];
+					}
+				}
+			}
+			else
+			{
+				for (y = scissor.y0; y < scissor.y1; y++)
+				{
+					s = dest->samples + (unsigned int)((y - dest->y) * dest->stride + (scissor.x0 - dest->x) * n);
+					for (x = scissor.x0; x < scissor.x1; x++)
+					{
+						for (i = 0; i < n; i++)
+							*s++ = colorbv[i];
+					}
+				}
+			}
+			if (shape)
+			{
+				for (y = scissor.y0; y < scissor.y1; y++)
+				{
+					s = shape->samples + (unsigned int)((y - shape->y) * shape->stride + (scissor.x0 - shape->x));
+					for (x = scissor.x0; x < scissor.x1; x++)
+					{
+						*s++ = 255;
+					}
+				}
+			}
+			if (group_alpha)
+			{
+				for (y = scissor.y0; y < scissor.y1; y++)
+				{
+					s = group_alpha->samples + (unsigned int)((y - group_alpha->y) * group_alpha->stride + (scissor.x0 - group_alpha->x));
+					for (x = scissor.x0; x < scissor.x1; x++)
+					{
+						*s++ = alpha_byte;
+					}
+				}
+			}
+		}
+		if (color_params.op)
+			eop = set_op_from_spaces(ctx, &op, dest, colorspace, 0);
+		else
+			eop = NULL;
+		fz_paint_shade(ctx, shade, colorspace, ctm, dest, color_params, bbox, eop, &dev->shade_cache);
+		if (shape)
+			fz_clear_pixmap_rect_with_value(ctx, shape, 255, bbox);
+		if (group_alpha)
+			fz_clear_pixmap_rect_with_value(ctx, group_alpha, 255, bbox);
+#ifdef DUMP_GROUP_BLENDS
+		dump_spaces(dev->top, "");
+		fz_dump_blend(ctx, "Shade ", dest);
+		if (shape)
+			fz_dump_blend(ctx, "/S=", shape);
+		if (group_alpha)
+			fz_dump_blend(ctx, "/GA=", group_alpha);
+		printf("\n");
+#endif
+		if (alpha < 1)
+		{
+			/* FIXME: eop */
+			fz_paint_pixmap(state->dest, dest, alpha * 255);
+			fz_drop_pixmap(ctx, dest);
+			dest = NULL;
+			if (shape)
+			{
+				fz_paint_pixmap(state->shape, shape, 255);
+				fz_drop_pixmap(ctx, shape);
+				shape = NULL;
+			}
+			if (group_alpha)
+			{
+				fz_paint_pixmap(state->group_alpha, group_alpha, alpha * 255);
+				fz_drop_pixmap(ctx, group_alpha);
+				group_alpha = NULL;
+			}
+		}
+		if (state->blendmode & FZ_BLEND_KNOCKOUT && alpha != 1)
+			fz_knockout_end(ctx, dev);
+	}
+	fz_catch(ctx)
+	{
+		if (dest != state[0].dest) fz_drop_pixmap(ctx, dest);
+		if (shape != state[0].shape) fz_drop_pixmap(ctx, shape);
+		if (group_alpha != state[0].group_alpha) fz_drop_pixmap(ctx, group_alpha);
+		fz_rethrow(ctx);
+	}
+}
+static fz_pixmap *
+fz_transform_pixmap(fz_context *ctx, fz_draw_device *dev, const fz_pixmap *image, fz_matrix *ctm, int x, int y, int dx, int dy, int gridfit, const fz_irect *clip)
+{
+	fz_pixmap *scaled;
+	if (clip != NULL && fz_is_empty_irect(*clip))
+		return NULL;
+	if (ctm->a != 0 && ctm->b == 0 && ctm->c == 0 && ctm->d != 0)
+	{
+		/* Unrotated or X-flip or Y-flip or XY-flip */
+		fz_matrix m = *ctm;
+		if (gridfit)
+		{
+			m = fz_gridfit_matrix(dev->flags & FZ_DEVFLAG_GRIDFIT_AS_TILED, m);
+		}
+		scaled = fz_scale_pixmap_cached(ctx, image, m.e, m.f, m.a, m.d, clip, dev->cache_x, dev->cache_y);
+		if (!scaled)
+			return NULL;
+		ctm->a = scaled->w;
+		ctm->d = scaled->h;
+		ctm->e = scaled->x;
+		ctm->f = scaled->y;
+		return scaled;
+	}
+	if (ctm->a == 0 && ctm->b != 0 && ctm->c != 0 && ctm->d == 0)
+	{
+		/* Other orthogonal flip/rotation cases */
+		fz_matrix m = *ctm;
+		fz_irect rclip;
+		if (gridfit)
+			m = fz_gridfit_matrix(dev->flags & FZ_DEVFLAG_GRIDFIT_AS_TILED, m);
+		if (clip)
+		{
+			rclip.x0 = clip->y0;
+			rclip.y0 = clip->x0;
+			rclip.x1 = clip->y1;
+			rclip.y1 = clip->x1;
+		}
+		scaled = fz_scale_pixmap_cached(ctx, image, m.f, m.e, m.b, m.c, (clip ? &rclip : NULL), dev->cache_x, dev->cache_y);
+		if (!scaled)
+			return NULL;
+		ctm->b = scaled->w;
+		ctm->c = scaled->h;
+		ctm->f = scaled->x;
+		ctm->e = scaled->y;
+		return scaled;
+	}
+	/* Downscale, non rectilinear case */
+	if (dx > 0 && dy > 0)
+	{
+		scaled = fz_scale_pixmap_cached(ctx, image, 0, 0, dx, dy, NULL, dev->cache_x, dev->cache_y);
+		return scaled;
+	}
+	return NULL;
+}
+int
+fz_default_image_scale(void *arg, int dst_w, int dst_h, int src_w, int src_h)
+{
+	(void)arg;
+	return dst_w < src_w && dst_h < src_h;
+}
+static fz_pixmap *
+convert_pixmap_for_painting(fz_context *ctx, fz_pixmap *pixmap, fz_colorspace *model, fz_colorspace *src_cs, fz_pixmap *dest, fz_color_params color_params, fz_draw_device *dev, fz_overprint **eop)
+{
+	fz_pixmap *converted;
+	/* It's OK to plot a pixmap with no seps onto a dest with seps, but if the pixmap has seps, then they must match! */
+	if ((fz_colorspace_is_device_n(ctx, src_cs) && dest->seps) || (pixmap->seps != NULL && fz_compare_separations(ctx, pixmap->seps, dest->seps)))
+	{
+		converted = fz_clone_pixmap_area_with_different_seps(ctx, pixmap, NULL, model, dest->seps, color_params, dev->default_cs);
+		*eop = set_op_from_spaces(ctx, *eop, dest, src_cs, 0);
+	}
+	else
+	{
+		converted = fz_convert_pixmap(ctx, pixmap, model, NULL, dev->default_cs, color_params, 1);
+		if (*eop)
+		{
+			if (fz_colorspace_type(ctx, model) != FZ_COLORSPACE_CMYK)
+			{
+				/* Can only overprint to CMYK based spaces */
+				*eop = NULL;
+			}
+			else if (!fz_colorspace_is_device_n(ctx, pixmap->colorspace))
+			{
+				int i;
+				int n = dest->n - dest->alpha;
+				for (i = 4; i < n; i++)
+					fz_set_overprint(*eop, i);
+			}
+			else
+			{
+				*eop = set_op_from_spaces(ctx, *eop, dest, src_cs, 0);
+			}
+		}
+	}
+	fz_drop_pixmap(ctx, pixmap);
+	return converted;
+}
+static fz_irect
+find_src_area_required(fz_matrix local_ctm, fz_image *image, fz_irect clip)
+{
+	fz_matrix inverse;
+	fz_irect src_area;
+	/* ctm maps the image (expressed as the unit square) onto the
+	 * destination device. Reverse that to get a mapping from
+	 * the destination device to the source pixels. */
+	if (fz_try_invert_matrix(&inverse, local_ctm))
+	{
+		/* Not invertible. Could just bail? Use the whole image
+		 * for now. */
+		src_area.x0 = 0;
+		src_area.x1 = image->w;
+		src_area.y0 = 0;
+		src_area.y1 = image->h;
+	}
+	else
+	{
+		float exp;
+		fz_rect rect;
+		fz_irect sane;
+		/* We want to scale from image coords, not from unit square */
+		inverse = fz_post_scale(inverse, image->w, image->h);
+		/* Are we scaling up or down? exp < 1 means scaling down. */
+		exp = fz_matrix_max_expansion(inverse);
+		rect = fz_rect_from_irect(clip);
+		rect = fz_transform_rect(rect, inverse);
+		/* Allow for support requirements for scalers. */
+		rect = fz_expand_rect(rect, fz_max(exp, 1) * 4);
+		src_area = fz_irect_from_rect(rect);
+		sane.x0 = 0;
+		sane.y0 = 0;
+		sane.x1 = image->w;
+		sane.y1 = image->h;
+		src_area = fz_intersect_irect(src_area, sane);
+	}
+	return src_area;
+}
+static void
+fz_draw_fill_image(fz_context *ctx, fz_device *devp, fz_image *image, fz_matrix in_ctm, float alpha, fz_color_params color_params)
+{
+	fz_draw_device *dev = (fz_draw_device*)devp;
+	fz_matrix local_ctm = fz_concat(in_ctm, dev->transform);
+	fz_pixmap *pixmap;
+	int after;
+	int dx, dy;
+	fz_draw_state *state = &dev->stack[dev->top];
+	fz_colorspace *model;
+	fz_irect clip;
+	fz_irect src_area;
+	fz_colorspace *src_cs;
+	fz_overprint op = { { 0 } };
+	fz_overprint *eop = &op;
+	if (alpha == 0)
+		return;
+	if (dev->top == 0 && dev->resolve_spots)
+		state = push_group_for_separations(ctx, dev, color_params, dev->default_cs);
+	model = state->dest->colorspace;
+	clip = fz_intersect_irect(fz_pixmap_bbox(ctx, state->dest), state->scissor);
+	if (image->w == 0 || image->h == 0 || fz_is_empty_irect(clip))
+		return;
+	if (color_params.op == 0)
+		eop = NULL;
+	if (!(dev->flags & FZ_DRAWDEV_FLAGS_TYPE3))
+		local_ctm = fz_gridfit_matrix(devp->flags & FZ_DEVFLAG_GRIDFIT_AS_TILED, local_ctm);
+	src_area = find_src_area_required(local_ctm, image, clip);
+	if (fz_is_empty_irect(src_area))
+		return;
+	pixmap = fz_get_pixmap_from_image(ctx, image, &src_area, &local_ctm, &dx, &dy);
+	src_cs = fz_default_colorspace(ctx, dev->default_cs, pixmap->colorspace);
+	/* convert images with more components (cmyk->rgb) before scaling */
+	/* convert images with fewer components (gray->rgb) after scaling */
+	/* convert images with expensive colorspace transforms after scaling */
+	fz_var(pixmap);
+	fz_try(ctx)
+	{
+		int conversion_required = (src_cs != model || fz_compare_separations(ctx, state->dest->seps, pixmap->seps));
+		if (state->blendmode & FZ_BLEND_KNOCKOUT && alpha != 1)
+			state = fz_knockout_begin(ctx, dev);
+		switch (fz_colorspace_type(ctx, src_cs))
+		{
+		case FZ_COLORSPACE_GRAY:
+			after = 1;
+			break;
+		case FZ_COLORSPACE_INDEXED:
+			after = 0;
+			break;
+		default:
+			if (fz_colorspace_n(ctx, src_cs) <= fz_colorspace_n(ctx, model))
+				after = 1;
+			else
+				after = 0;
+			break;
+		}
+		if (conversion_required && !after)
+			pixmap = convert_pixmap_for_painting(ctx, pixmap, model, src_cs, state->dest, color_params, dev, &eop);
+		if (!(devp->hints & FZ_DONT_INTERPOLATE_IMAGES) && ctx->tuning->image_scale(ctx->tuning->image_scale_arg, dx, dy, pixmap->w, pixmap->h))
+		{
+			int gridfit = alpha == 1.0f && !(dev->flags & FZ_DRAWDEV_FLAGS_TYPE3);
+			fz_pixmap *scaled = fz_transform_pixmap(ctx, dev, pixmap, &local_ctm, state->dest->x, state->dest->y, dx, dy, gridfit, &clip);
+			if (!scaled)
+			{
+				if (dx < 1)
+					dx = 1;
+				if (dy < 1)
+					dy = 1;
+				scaled = fz_scale_pixmap_cached(ctx, pixmap, pixmap->x, pixmap->y, dx, dy, NULL, dev->cache_x, dev->cache_y);
+			}
+			if (scaled)
+			{
+				fz_drop_pixmap(ctx, pixmap);
+				pixmap = scaled;
+			}
+		}
+		if (conversion_required && after)
+		{
+#if FZ_PLOTTERS_RGB
+			if (state->dest->seps == NULL &&
+				((src_cs == fz_device_gray(ctx) && model == fz_device_rgb(ctx)) ||
+				(src_cs == fz_device_gray(ctx) && model == fz_device_bgr(ctx))))
+			{
+				/* We have special case rendering code for gray -> rgb/bgr */
+			}
+			else
+#endif
+				pixmap = convert_pixmap_for_painting(ctx, pixmap, model, src_cs, state->dest, color_params, dev, &eop);
+		}
+		fz_paint_image(ctx, state->dest, &state->scissor, state->shape, state->group_alpha, pixmap, local_ctm, alpha * 255, !(devp->hints & FZ_DONT_INTERPOLATE_IMAGES), eop);
+		if (state->blendmode & FZ_BLEND_KNOCKOUT && alpha != 1)
+			fz_knockout_end(ctx, dev);
+	}
+	fz_always(ctx)
+		fz_drop_pixmap(ctx, pixmap);
+	fz_catch(ctx)
+		fz_rethrow(ctx);
+}
+static void
+fz_draw_fill_image_mask(fz_context *ctx, fz_device *devp, fz_image *image, fz_matrix in_ctm,
+	fz_colorspace *colorspace_in, const float *color, float alpha, fz_color_params color_params)
+{
+	fz_draw_device *dev = (fz_draw_device*)devp;
+	fz_matrix local_ctm = fz_concat(in_ctm, dev->transform);
+	unsigned char colorbv[FZ_MAX_COLORS + 1];
+	fz_pixmap *scaled = NULL;
+	fz_pixmap *pixmap;
+	int dx, dy;
+	fz_draw_state *state = &dev->stack[dev->top];
+	fz_irect clip;
+	fz_irect src_area;
+	fz_colorspace *colorspace = NULL;
+	fz_overprint op = { { 0 } };
+	fz_overprint *eop;
+	if (alpha == 0)
+		return;
+	if (dev->top == 0 && dev->resolve_spots)
+		state = push_group_for_separations(ctx, dev, color_params, dev->default_cs);
+	if (colorspace_in)
+		colorspace = fz_default_colorspace(ctx, dev->default_cs, colorspace_in);
+	clip = fz_pixmap_bbox(ctx, state->dest);
+	clip = fz_intersect_irect(clip, state->scissor);
+	if (image->w == 0 || image->h == 0)
+		return;
+	if (!(dev->flags & FZ_DRAWDEV_FLAGS_TYPE3))
+		local_ctm = fz_gridfit_matrix(devp->flags & FZ_DEVFLAG_GRIDFIT_AS_TILED, local_ctm);
+	src_area = find_src_area_required(local_ctm, image, clip);
+	if (fz_is_empty_irect(src_area))
+		return;
+	pixmap = fz_get_pixmap_from_image(ctx, image, &src_area, &local_ctm, &dx, &dy);
+	fz_var(pixmap);
+	fz_try(ctx)
+	{
+		if (state->blendmode & FZ_BLEND_KNOCKOUT && alpha != 1)
+			state = fz_knockout_begin(ctx, dev);
+		if (!(devp->hints & FZ_DONT_INTERPOLATE_IMAGES) && ctx->tuning->image_scale(ctx->tuning->image_scale_arg, dx, dy, pixmap->w, pixmap->h))
+		{
+			int gridfit = alpha == 1.0f && !(dev->flags & FZ_DRAWDEV_FLAGS_TYPE3);
+			scaled = fz_transform_pixmap(ctx, dev, pixmap, &local_ctm, state->dest->x, state->dest->y, dx, dy, gridfit, &clip);
+			if (!scaled)
+			{
+				if (dx < 1)
+					dx = 1;
+				if (dy < 1)
+					dy = 1;
+				scaled = fz_scale_pixmap_cached(ctx, pixmap, pixmap->x, pixmap->y, dx, dy, NULL, dev->cache_x, dev->cache_y);
+			}
+			if (scaled)
+			{
+				fz_drop_pixmap(ctx, pixmap);
+				pixmap = scaled;
+			}
+		}
+		eop = resolve_color(ctx, &op, color, colorspace, alpha, color_params, colorbv, state->dest, dev->overprint_possible);
+		fz_paint_image_with_color(ctx, state->dest, &state->scissor, state->shape, state->group_alpha, pixmap, local_ctm, colorbv, !(devp->hints & FZ_DONT_INTERPOLATE_IMAGES), eop);
+		if (state->blendmode & FZ_BLEND_KNOCKOUT && alpha != 1)
+			fz_knockout_end(ctx, dev);
+	}
+	fz_always(ctx)
+		fz_drop_pixmap(ctx, pixmap);
+	fz_catch(ctx)
+		fz_rethrow(ctx);
+}
+static void
+fz_draw_clip_image_mask(fz_context *ctx, fz_device *devp, fz_image *image, fz_matrix in_ctm, fz_rect scissor)
+{
+	fz_draw_device *dev = (fz_draw_device*)devp;
+	fz_matrix local_ctm = fz_concat(in_ctm, dev->transform);
+	fz_irect bbox;
+	fz_pixmap *scaled = NULL;
+	fz_pixmap *pixmap = NULL;
+	int dx, dy;
+	fz_draw_state *state = push_stack(ctx, dev, "clip image mask");
+	fz_colorspace *model = state->dest->colorspace;
+	fz_irect clip;
+	fz_irect src_area;
+	fz_var(pixmap);
+	if (dev->top == 0 && dev->resolve_spots)
+		state = push_group_for_separations(ctx, dev, fz_default_color_params /* FIXME */, dev->default_cs);
+	clip = fz_pixmap_bbox(ctx, state->dest);
+	clip = fz_intersect_irect(clip, state->scissor);
+	if (image->w == 0 || image->h == 0)
+	{
+#ifdef DUMP_GROUP_BLENDS
+		dump_spaces(dev->top-1, "Clip (image mask) (empty) begin\n");
+#endif
+		state[1].scissor = fz_empty_irect;
+		state[1].mask = NULL;
+		return;
+	}
+	if (!(dev->flags & FZ_DRAWDEV_FLAGS_TYPE3))
+		local_ctm = fz_gridfit_matrix(devp->flags & FZ_DEVFLAG_GRIDFIT_AS_TILED, local_ctm);
+	src_area = find_src_area_required(local_ctm, image, clip);
+	if (fz_is_empty_irect(src_area))
+	{
+#ifdef DUMP_GROUP_BLENDS
+		dump_spaces(dev->top-1, "Clip (image mask) (empty source area) begin\n");
+#endif
+		state[1].scissor = fz_empty_irect;
+		state[1].mask = NULL;
+		return;
+	}
+	bbox = fz_irect_from_rect(fz_transform_rect(fz_unit_rect, local_ctm));
+	bbox = fz_intersect_irect(bbox, state->scissor);
+	if (!fz_is_infinite_rect(scissor))
+	{
+		fz_rect tscissor = fz_transform_rect(scissor, dev->transform);
+		bbox = fz_intersect_irect(bbox, fz_irect_from_rect(tscissor));
+	}
+	if (!fz_is_valid_irect(bbox))
+	{
+#ifdef DUMP_GROUP_BLENDS
+		dump_spaces(dev->top-1, "Clip (image mask) (invalid) begin\n");
+#endif
+		state[1].scissor = fz_empty_irect;
+		state[1].mask = NULL;
+		return;
+	}
+#ifdef DUMP_GROUP_BLENDS
+	dump_spaces(dev->top-1, "Clip (image mask) begin\n");
+#endif
+	fz_try(ctx)
+	{
+		pixmap = fz_get_pixmap_from_image(ctx, image, &src_area, &local_ctm, &dx, &dy);
+		state[1].mask = fz_new_pixmap_with_bbox(ctx, NULL, bbox, NULL, 1);
+		fz_clear_pixmap(ctx, state[1].mask);
+		state[1].dest = fz_new_pixmap_with_bbox(ctx, model, bbox, state[0].dest->seps, state[0].dest->alpha);
+		fz_copy_pixmap_rect(ctx, state[1].dest, state[0].dest, bbox, dev->default_cs);
+		if (state[0].shape)
+		{
+			state[1].shape = fz_new_pixmap_with_bbox(ctx, NULL, bbox, NULL, 1);
+			fz_clear_pixmap(ctx, state[1].shape);
+		}
+		if (state[0].group_alpha)
+		{
+			state[1].group_alpha = fz_new_pixmap_with_bbox(ctx, NULL, bbox, NULL, 1);
+			fz_clear_pixmap(ctx, state[1].group_alpha);
+		}
+		state[1].blendmode |= FZ_BLEND_ISOLATED;
+		state[1].scissor = bbox;
+		if (!(devp->hints & FZ_DONT_INTERPOLATE_IMAGES) && ctx->tuning->image_scale(ctx->tuning->image_scale_arg, dx, dy, pixmap->w, pixmap->h))
+		{
+			int gridfit = !(dev->flags & FZ_DRAWDEV_FLAGS_TYPE3);
+			scaled = fz_transform_pixmap(ctx, dev, pixmap, &local_ctm, state->dest->x, state->dest->y, dx, dy, gridfit, &clip);
+			if (!scaled)
+			{
+				if (dx < 1)
+					dx = 1;
+				if (dy < 1)
+					dy = 1;
+				scaled = fz_scale_pixmap_cached(ctx, pixmap, pixmap->x, pixmap->y, dx, dy, NULL, dev->cache_x, dev->cache_y);
+			}
+			if (scaled)
+			{
+				fz_drop_pixmap(ctx, pixmap);
+				pixmap = scaled;
+			}
+		}
+#ifdef DUMP_GROUP_BLENDS
+		dump_spaces(dev->top, "");
+		fz_dump_blend(ctx, "Creating imagemask: plotting ", pixmap);
+		fz_dump_blend(ctx, " onto ", state[1].mask);
+		if (state[1].shape)
+			fz_dump_blend(ctx, "/S=", state[1].shape);
+		if (state[1].group_alpha)
+			fz_dump_blend(ctx, "/GA=", state[1].group_alpha);
+#endif
+		fz_paint_image(ctx, state[1].mask, &bbox, state[1].shape, state[1].group_alpha, pixmap, local_ctm, 255, !(devp->hints & FZ_DONT_INTERPOLATE_IMAGES), 0);
+#ifdef DUMP_GROUP_BLENDS
+		fz_dump_blend(ctx, " to get ", state[1].mask);
+		if (state[1].shape)
+			fz_dump_blend(ctx, "/S=", state[1].shape);
+		if (state[1].group_alpha)
+			fz_dump_blend(ctx, "/GA=", state[1].group_alpha);
+		printf("\n");
+#endif
+	}
+	fz_always(ctx)
+		fz_drop_pixmap(ctx, pixmap);
+	fz_catch(ctx)
+		fz_rethrow(ctx);
+}
+static void
+fz_draw_pop_clip(fz_context *ctx, fz_device *devp)
+{
+	fz_draw_device *dev = (fz_draw_device*)devp;
+	fz_draw_state *state;
+	if (dev->top == 0)
+		fz_throw(ctx, FZ_ERROR_ARGUMENT, "unexpected pop clip");
+	state = pop_stack(ctx, dev, "clip");
+	/* We can get here with state[1].mask == NULL if the clipping actually
+	 * resolved to a rectangle earlier.
+	 */
+	if (state[1].mask)
+	{
+		fz_try(ctx)
+		{
+#ifdef DUMP_GROUP_BLENDS
+			dump_spaces(dev->top, "");
+			fz_dump_blend(ctx, "Clipping ", state[1].dest);
+			if (state[1].shape)
+				fz_dump_blend(ctx, "/S=", state[1].shape);
+			if (state[1].group_alpha)
+				fz_dump_blend(ctx, "/GA=", state[1].group_alpha);
+			fz_dump_blend(ctx, " onto ", state[0].dest);
+			if (state[0].shape)
+				fz_dump_blend(ctx, "/S=", state[0].shape);
+			if (state[0].group_alpha)
+				fz_dump_blend(ctx, "/GA=", state[0].group_alpha);
+			fz_dump_blend(ctx, " with ", state[1].mask);
+#endif
+			fz_paint_pixmap_with_mask(state[0].dest, state[1].dest, state[1].mask);
+			if (state[0].shape != state[1].shape)
+			{
+				fz_paint_over_pixmap_with_mask(state[0].shape, state[1].shape, state[1].mask);
+			}
+			if (state[0].group_alpha != state[1].group_alpha)
+			{
+				fz_paint_over_pixmap_with_mask(state[0].group_alpha, state[1].group_alpha, state[1].mask);
+			}
+#ifdef DUMP_GROUP_BLENDS
+			fz_dump_blend(ctx, " to get ", state[0].dest);
+			if (state[0].shape)
+				fz_dump_blend(ctx, "/S=", state[0].shape);
+			if (state[0].group_alpha)
+				fz_dump_blend(ctx, "/GA=", state[0].group_alpha);
+			printf("\n");
+#endif
+		}
+		fz_always(ctx)
+			cleanup_post_pop(ctx, state);
+		fz_catch(ctx)
+			fz_rethrow(ctx);
+	}
+	else
+	{
+#ifdef DUMP_GROUP_BLENDS
+		dump_spaces(dev->top, "Clip end\n");
+#endif
+	}
+}
+static void
+fz_draw_begin_mask(fz_context *ctx, fz_device *devp, fz_rect area, int luminosity, fz_colorspace *colorspace_in, const float *colorfv, fz_color_params color_params)
+{
+	fz_draw_device *dev = (fz_draw_device*)devp;
+	fz_pixmap *dest;
+	fz_irect bbox;
+	fz_draw_state *state = push_stack(ctx, dev, "mask");
+	fz_pixmap *shape = state->shape;
+	fz_pixmap *group_alpha = state->group_alpha;
+	fz_rect trect;
+	fz_colorspace *colorspace = NULL;
+	if (dev->top == 0 && dev->resolve_spots)
+		state = push_group_for_separations(ctx, dev, color_params, dev->default_cs);
+	if (colorspace_in)
+		colorspace = fz_default_colorspace(ctx, dev->default_cs, colorspace_in);
+	trect = fz_transform_rect(area, dev->transform);
+	bbox = fz_intersect_irect(fz_irect_from_rect(trect), state->scissor);
+	/* Reset the blendmode for the mask rendering. In particular,
+	 * don't carry forward knockout or isolated. */
+	state[1].blendmode = 0;
+	/* If luminosity, then we generate a mask from the greyscale value of the shapes.
+	 * If !luminosity, then we generate a mask from the alpha value of the shapes.
+	 */
+	if (luminosity)
+		state[1].dest = dest = fz_new_pixmap_with_bbox(ctx, fz_device_gray(ctx), bbox, NULL, 0);
+	else
+		state[1].dest = dest = fz_new_pixmap_with_bbox(ctx, NULL, bbox, NULL, 1);
+	if (state->shape)
+	{
+		/* FIXME: If we ever want to support AIS true, then
+		 * we probably want to create a shape pixmap here,
+		 * using: shape = fz_new_pixmap_with_bbox(NULL, bbox);
+		 * then, in the end_mask code, we create the mask
+		 * from this rather than dest.
+		 */
+		state[1].shape = shape = NULL;
+	}
+	if (state->group_alpha)
+	{
+		state[1].group_alpha = group_alpha = NULL;
+	}
+	if (luminosity)
+	{
+		float bc;
+		if (!colorspace)
+			colorspace = fz_device_gray(ctx);
+		fz_convert_color(ctx, colorspace, colorfv, fz_device_gray(ctx), &bc, NULL, color_params);
+		fz_clear_pixmap_with_value(ctx, dest, bc * 255);
+		if (shape)
+			fz_clear_pixmap_with_value(ctx, shape, 255);
+		if (group_alpha)
+			fz_clear_pixmap_with_value(ctx, group_alpha, 255);
+	}
+	else
+	{
+		fz_clear_pixmap(ctx, dest);
+		if (shape)
+			fz_clear_pixmap(ctx, shape);
+		if (group_alpha)
+			fz_clear_pixmap(ctx, group_alpha);
+	}
+#ifdef DUMP_GROUP_BLENDS
+	dump_spaces(dev->top-1, "Mask begin\n");
+#endif
+	state[1].scissor = bbox;
+}
+static void
+apply_transfer_function_to_pixmap(fz_context *ctx, fz_pixmap *pix, fz_function *tr)
+{
+	int w, h;
+	ptrdiff_t stride;
+	uint8_t *s;
+	assert(pix && pix->n == 1);
+	if (pix->w * (size_t)pix->h > 1024)
+	{
+		uint8_t memo[256];
+		for (w = 0; w < 256; w++)
+		{
+			float f = w / 255.0f;
+			float d;
+			fz_eval_function(ctx, tr, &f, 1, &d, 1);
+			memo[w] = (uint8_t)fz_clampi(d*255.0f, 0, 255);
+		}
+		s = pix->samples;
+		stride = pix->stride - pix->w;
+		for (h = pix->h; h > 0; h--)
+		{
+			for (w = pix->w; w > 0; w--)
+			{
+				*s = memo[*s];
+				s++;
+			}
+			s += stride;
+		}
+		return;
+	}
+	s = pix->samples;
+	stride = pix->stride - pix->w;
+	for (h = pix->h; h > 0; h--)
+	{
+		for (w = pix->w; w > 0; w--)
+		{
+			float f = *s / 255.0f;
+			float d;
+			fz_eval_function(ctx, tr, &f, 1, &d, 1);
+			*s++ = (uint8_t)fz_clampi(d*255.0f, 0, 255);
+		}
+		s += stride;
+	}
+}
+static void
+fz_draw_end_mask(fz_context *ctx, fz_device *devp, fz_function *tr)
+{
+	fz_draw_device *dev = (fz_draw_device*)devp;
+	fz_pixmap *temp, *dest;
+	fz_irect bbox;
+	fz_draw_state *state;
+	if (dev->top == 0)
+		fz_throw(ctx, FZ_ERROR_ARGUMENT, "unexpected end mask");
+	state = convert_stack(ctx, dev, "mask");
+#ifdef DUMP_GROUP_BLENDS
+	dump_spaces(dev->top-1, "Mask -> Clip: ");
+	fz_dump_blend(ctx, "Mask ", state[1].dest);
+	if (state[1].shape)
+		fz_dump_blend(ctx, "/S=", state[1].shape);
+	if (state[1].group_alpha)
+		fz_dump_blend(ctx, "/GA=", state[1].group_alpha);
+#endif
+	{
+		/* convert to alpha mask */
+		temp = fz_alpha_from_gray(ctx, state[1].dest);
+		if (state[1].mask != state[0].mask)
+			fz_drop_pixmap(ctx, state[1].mask);
+		state[1].mask = temp;
+		if (state[1].dest != state[0].dest)
+			fz_drop_pixmap(ctx, state[1].dest);
+		state[1].dest = NULL;
+		if (state[1].shape != state[0].shape)
+			fz_drop_pixmap(ctx, state[1].shape);
+		state[1].shape = NULL;
+		if (state[1].group_alpha != state[0].group_alpha)
+			fz_drop_pixmap(ctx, state[1].group_alpha);
+		state[1].group_alpha = NULL;
+#ifdef DUMP_GROUP_BLENDS
+		fz_dump_blend(ctx, "-> Clip ", temp);
+		printf("\n");
+#endif
+		if (tr)
+		{
+			/* Apply transfer function to state[1].mask */
+			apply_transfer_function_to_pixmap(ctx, state[1].mask, tr);
+		}
+		/* create new dest scratch buffer */
+		bbox = fz_pixmap_bbox(ctx, temp);
+		dest = fz_new_pixmap_with_bbox(ctx, state->dest->colorspace, bbox, state->dest->seps, state->dest->alpha);
+		fz_copy_pixmap_rect(ctx, dest, state->dest, bbox, dev->default_cs);
+		/* push soft mask as clip mask */
+		state[1].dest = dest;
+		state[1].blendmode |= FZ_BLEND_ISOLATED;
+		/* If we have a shape, then it'll need to be masked with the
+		 * clip mask when we pop. So create a new shape now. */
+		if (state[0].shape)
+		{
+			state[1].shape = fz_new_pixmap_with_bbox(ctx, NULL, bbox, NULL, 1);
+			fz_clear_pixmap(ctx, state[1].shape);
+		}
+		if (state[0].group_alpha)
+		{
+			state[1].group_alpha = fz_new_pixmap_with_bbox(ctx, NULL, bbox, NULL, 1);
+			fz_clear_pixmap(ctx, state[1].group_alpha);
+		}
+		state[1].scissor = bbox;
+	}
+}
+static void
+fz_draw_begin_group(fz_context *ctx, fz_device *devp, fz_rect area, fz_colorspace *cs, int isolated, int knockout, int blendmode, float alpha)
+{
+	fz_draw_device *dev = (fz_draw_device*)devp;
+	fz_irect bbox;
+	fz_pixmap *dest;
+	fz_draw_state *state = &dev->stack[dev->top];
+	fz_colorspace *model = state->dest->colorspace;
+	fz_rect trect;
+	if (dev->top == 0 && dev->resolve_spots)
+		state = push_group_for_separations(ctx, dev, fz_default_color_params /* FIXME */, dev->default_cs);
+	if (cs != NULL)
+		model = fz_default_colorspace(ctx, dev->default_cs, cs);
+	if (state->blendmode & FZ_BLEND_KNOCKOUT)
+		fz_knockout_begin(ctx, dev);
+	state = push_stack(ctx, dev, "group");
+	trect = fz_transform_rect(area, dev->transform);
+	bbox = fz_intersect_irect(fz_irect_from_rect(trect), state->scissor);
+#ifndef ATTEMPT_KNOCKOUT_AND_ISOLATED
+	knockout = 0;
+	isolated = 1;
+#endif
+	state[1].dest = dest = fz_new_pixmap_with_bbox(ctx, model, bbox, state[0].dest->seps, state[0].dest->alpha || isolated);
+	if (isolated)
+	{
+		fz_clear_pixmap(ctx, dest);
+		state[1].group_alpha = NULL;
+	}
+	else
+	{
+		fz_copy_pixmap_rect(ctx, dest, state[0].dest, bbox, dev->default_cs);
+		state[1].group_alpha = fz_new_pixmap_with_bbox(ctx, NULL, bbox, NULL, 1);
+		fz_clear_pixmap(ctx, state[1].group_alpha);
+	}
+	/* shape is inherited from the previous group */
+	state[1].alpha = alpha;
+#ifdef DUMP_GROUP_BLENDS
+	dump_spaces(dev->top-1, "");
+	{
+		char text[240];
+		char atext[80];
+		char btext[80];
+		if (alpha != 1)
+			sprintf(atext, " (alpha %g)", alpha);
+		else
+			atext[0] = 0;
+		if (blendmode != 0)
+			sprintf(btext, " (blend %d)", blendmode);
+		else
+			btext[0] = 0;
+		sprintf(text, "Group begin%s%s%s%s: background is ", isolated ? " (isolated)" : "", knockout ? " (knockout)" : "", atext, btext);
+		fz_dump_blend(ctx, text, state[1].dest);
+	}
+	if (state[1].shape)
+		fz_dump_blend(ctx, "/S=", state[1].shape);
+	if (state[1].group_alpha)
+		fz_dump_blend(ctx, "/GA=", state[1].group_alpha);
+	printf("\n");
+#endif
+	state[1].scissor = bbox;
+	state[1].blendmode = blendmode | (isolated ? FZ_BLEND_ISOLATED : 0) | (knockout ? FZ_BLEND_KNOCKOUT : 0);
+}
+static void
+fz_draw_end_group(fz_context *ctx, fz_device *devp)
+{
+	fz_draw_device *dev = (fz_draw_device*)devp;
+	int blendmode;
+	int isolated;
+	float alpha;
+	fz_draw_state *state;
+	if (dev->top == 0)
+		fz_throw(ctx, FZ_ERROR_ARGUMENT, "unexpected end group");
+	state = pop_stack(ctx, dev, "group");
+	fz_try(ctx)
+	{
+		alpha = state[1].alpha;
+		blendmode = state[1].blendmode & FZ_BLEND_MODEMASK;
+		isolated = state[1].blendmode & FZ_BLEND_ISOLATED;
+#ifdef DUMP_GROUP_BLENDS
+		dump_spaces(dev->top, "");
+		fz_dump_blend(ctx, "Group end: blending ", state[1].dest);
+		if (state[1].shape)
+			fz_dump_blend(ctx, "/S=", state[1].shape);
+		if (state[1].group_alpha)
+			fz_dump_blend(ctx, "/GA=", state[1].group_alpha);
+		fz_dump_blend(ctx, " onto ", state[0].dest);
+		if (state[0].shape)
+			fz_dump_blend(ctx, "/S=", state[0].shape);
+		if (state[0].group_alpha)
+			fz_dump_blend(ctx, "/GA=", state[0].group_alpha);
+		if (alpha != 1.0f)
+			printf(" (alpha %g)", alpha);
+		if (blendmode != 0)
+			printf(" (blend %d)", blendmode);
+		if (isolated != 0)
+			printf(" (isolated)");
+		if (state[1].blendmode & FZ_BLEND_KNOCKOUT)
+			printf(" (knockout)");
+#endif
+		if (state[0].dest->colorspace != state[1].dest->colorspace)
+		{
+			fz_pixmap *converted = fz_convert_pixmap(ctx, state[1].dest, state[0].dest->colorspace, NULL, dev->default_cs, fz_default_color_params, 1);
+			fz_drop_pixmap(ctx, state[1].dest);
+			state[1].dest = converted;
+		}
+		if ((blendmode == 0) && (state[0].shape == state[1].shape) && (state[0].group_alpha == state[1].group_alpha))
+			fz_paint_pixmap(state[0].dest, state[1].dest, alpha * 255);
+		else
+			fz_blend_pixmap(ctx, state[0].dest, state[1].dest, alpha * 255, blendmode, isolated, state[1].group_alpha);
+		if (state[0].shape != state[1].shape)
+		{
+			/* The 'D' on page 7 of Altona_Technical_v20_x4.pdf goes wrong if this
+			 * isn't alpha * 255, as the blend back fails to take account of alpha. */
+			if (state[0].shape)
+			{
+				if (state[1].shape)
+					fz_paint_pixmap(state[0].shape, state[1].shape, alpha * 255);
+				else
+					fz_paint_pixmap_alpha(state[0].shape, state[1].dest, alpha * 255);
+			}
+		}
+		assert(state[0].group_alpha == NULL || state[0].group_alpha != state[1].group_alpha);
+		if (state[0].group_alpha && state[0].group_alpha != state[1].group_alpha)
+		{
+			/* The 'D' on page 7 of Altona_Technical_v20_x4.pdf uses an isolated group,
+			 * and goes wrong if this is 255 * alpha, as an alpha effectively gets
+			 * applied twice. CATX5233 page 7 uses a non-isolated group, and goes wrong
+			 * if alpha isn't applied here. */
+			if (state[1].group_alpha)
+				fz_paint_pixmap(state[0].group_alpha, state[1].group_alpha, isolated ? 255 : alpha * 255);
+			else
+				fz_paint_pixmap_alpha(state[0].group_alpha, state[1].dest, isolated ? 255 : alpha * 255);
+		}
+		assert(state[0].dest != state[1].dest);
+#ifdef DUMP_GROUP_BLENDS
+		fz_dump_blend(ctx, " to get ", state[0].dest);
+		if (state[0].shape)
+			fz_dump_blend(ctx, "/S=", state[0].shape);
+		if (state[0].group_alpha)
+			fz_dump_blend(ctx, "/GA=", state[0].group_alpha);
+		printf("\n");
+#endif
+	}
+	fz_always(ctx)
+		cleanup_post_pop(ctx, state);
+	fz_catch(ctx)
+		fz_rethrow(ctx);
+	if (state[0].blendmode & FZ_BLEND_KNOCKOUT)
+		fz_knockout_end(ctx, dev);
+}
+typedef struct
+{
+	int refs;
+	float ctm[4];
+	int id;
+	int doc_id;
+	char has_shape;
+	char has_group_alpha;
+	fz_colorspace *cs;
+} tile_key;
+typedef struct
+{
+	fz_storable storable;
+	fz_pixmap *dest;
+	fz_pixmap *shape;
+	fz_pixmap *group_alpha;
+} tile_record;
+static int
+fz_make_hash_tile_key(fz_context *ctx, fz_store_hash *hash, void *key_)
+{
+	tile_key *key = key_;
+	hash->u.im.id = key->id;
+	hash->u.im.doc_id = key->doc_id;
+	hash->u.im.has_shape = key->has_shape;
+	hash->u.im.has_group_alpha = key->has_group_alpha;
+	hash->u.im.m[0] = key->ctm[0];
+	hash->u.im.m[1] = key->ctm[1];
+	hash->u.im.m[2] = key->ctm[2];
+	hash->u.im.m[3] = key->ctm[3];
+	hash->u.im.ptr = key->cs;
+	return 1;
+}
+static void *
+fz_keep_tile_key(fz_context *ctx, void *key_)
+{
+	tile_key *key = key_;
+	return fz_keep_imp(ctx, key, &key->refs);
+}
+static void
+fz_drop_tile_key(fz_context *ctx, void *key_)
+{
+	tile_key *key = key_;
+	if (fz_drop_imp(ctx, key, &key->refs))
+	{
+		fz_drop_colorspace_store_key(ctx, key->cs);
+		fz_free(ctx, key);
+	}
+}
+static int
+fz_cmp_tile_key(fz_context *ctx, void *k0_, void *k1_)
+{
+	tile_key *k0 = k0_;
+	tile_key *k1 = k1_;
+	return k0->id == k1->id &&
+		k0->doc_id == k1->doc_id &&
+		k0->has_shape == k1->has_shape &&
+		k0->has_group_alpha == k1->has_group_alpha &&
+		k0->ctm[0] == k1->ctm[0] &&
+		k0->ctm[1] == k1->ctm[1] &&
+		k0->ctm[2] == k1->ctm[2] &&
+		k0->ctm[3] == k1->ctm[3] &&
+		k0->cs == k1->cs;
+}
+static void
+fz_format_tile_key(fz_context *ctx, char *s, size_t n, void *key_)
+{
+	tile_key *key = (tile_key *)key_;
+	fz_snprintf(s, n, "(tile id=%x, doc_id=%x, ctm=%g %g %g %g, cs=%x, shape=%d, ga=%d)",
+			key->id, key->doc_id, key->ctm[0], key->ctm[1], key->ctm[2], key->ctm[3], key->cs,
+			key->has_shape, key->has_group_alpha);
+}
+static const fz_store_type fz_tile_store_type =
+{
+	"struct tile_record",
+	fz_make_hash_tile_key,
+	fz_keep_tile_key,
+	fz_drop_tile_key,
+	fz_cmp_tile_key,
+	fz_format_tile_key,
+	NULL
+};
+static void
+fz_drop_tile_record_imp(fz_context *ctx, fz_storable *storable)
+{
+	tile_record *tr = (tile_record *)storable;
+	fz_drop_pixmap(ctx, tr->dest);
+	fz_drop_pixmap(ctx, tr->shape);
+	fz_drop_pixmap(ctx, tr->group_alpha);
+	fz_free(ctx, tr);
+}
+static void
+fz_drop_tile_record(fz_context *ctx, tile_record *tile)
+{
+	fz_drop_storable(ctx, &tile->storable);
+}
+static tile_record *
+fz_new_tile_record(fz_context *ctx, fz_pixmap *dest, fz_pixmap *shape, fz_pixmap *group_alpha)
+{
+	tile_record *tile = fz_malloc_struct(ctx, tile_record);
+	FZ_INIT_STORABLE(tile, 1, fz_drop_tile_record_imp);
+	tile->dest = fz_keep_pixmap(ctx, dest);
+	tile->shape = fz_keep_pixmap(ctx, shape);
+	tile->group_alpha = fz_keep_pixmap(ctx, group_alpha);
+	return tile;
+}
+size_t
+fz_tile_size(fz_context *ctx, tile_record *tile)
+{
+	if (!tile)
+		return 0;
+	return sizeof(*tile) + fz_pixmap_size(ctx, tile->dest) + fz_pixmap_size(ctx, tile->shape) + fz_pixmap_size(ctx, tile->group_alpha);
+}
+static int
+fz_draw_begin_tile(fz_context *ctx, fz_device *devp, fz_rect area, fz_rect view, float xstep, float ystep, fz_matrix in_ctm, int id, int doc_id)
+{
+	fz_draw_device *dev = (fz_draw_device*)devp;
+	fz_matrix ctm = fz_concat(in_ctm, dev->transform);
+	fz_pixmap *dest = NULL;
+	fz_pixmap *shape, *group_alpha;
+	fz_irect bbox;
+	fz_draw_state *state = &dev->stack[dev->top];
+	fz_colorspace *model = state->dest->colorspace;
+	fz_rect local_view;
+	if (dev->top == 0 && dev->resolve_spots)
+		state = push_group_for_separations(ctx, dev, fz_default_color_params /* FIXME */, dev->default_cs);
+	/* area, view, xstep, ystep are in pattern space
+	 * area = the extent that we need to tile the pattern into. (i.e this is
+	 * the area to be filled with the pattern mapped back into pattern space).
+	 * view = the pattern bbox.
+	 * xstep and ystep are the repeats for the file.
+	 */
+	/* ctm maps from pattern space to device space */
+	if (state->blendmode & FZ_BLEND_KNOCKOUT)
+		fz_knockout_begin(ctx, dev);
+	state = push_stack(ctx, dev, "tile");
+	state[1].flags = dev->flags;
+	dev->flags &= ~FZ_DRAWDEV_FLAGS_TYPE3;
+	local_view = fz_transform_rect(view, ctm);
+	bbox = fz_irect_from_rect(local_view);
+	/* We should never have a bbox that entirely covers our destination.
+	 * If we do, then the check for only 1 tile being visible above has
+	 * failed. Actually, this *can* fail due to the round_rect, at extreme
+	 * resolutions, so disable this assert.
+	 * assert(bbox.x0 > state->dest->x || bbox.x1 < state->dest->x + state->dest->w ||
+	 *	bbox.y0 > state->dest->y || bbox.y1 < state->dest->y + state->dest->h);
+	 */
+	/* A BBox of zero height or width should still paint one pixel! */
+	if (bbox.x1 == bbox.x0)
+		bbox.x1 = bbox.x0 + 1;
+	if (bbox.y1 == bbox.y0)
+		bbox.y1 = bbox.y0 + 1;
+	/* Check to see if we have one cached */
+	if (id)
+	{
+		tile_key tk;
+		tile_record *tile;
+		tk.ctm[0] = ctm.a;
+		tk.ctm[1] = ctm.b;
+		tk.ctm[2] = ctm.c;
+		tk.ctm[3] = ctm.d;
+		tk.id = id;
+		tk.doc_id = doc_id;
+		tk.cs = state[1].dest->colorspace;
+		tk.has_shape = (state[1].shape != NULL);
+		tk.has_group_alpha = (state[1].group_alpha != NULL);
+		tile = fz_find_item(ctx, fz_drop_tile_record_imp, &tk, &fz_tile_store_type);
+		if (tile)
+		{
+			state[1].dest = fz_keep_pixmap(ctx, tile->dest);
+			state[1].shape = fz_keep_pixmap(ctx, tile->shape);
+			state[1].group_alpha = fz_keep_pixmap(ctx, tile->group_alpha);
+			state[1].blendmode |= FZ_BLEND_ISOLATED;
+			state[1].xstep = xstep;
+			state[1].ystep = ystep;
+			state[1].id = id;
+			state[1].doc_id = doc_id;
+			state[1].encache = 0;
+			state[1].area = fz_irect_from_rect(area);
+			state[1].ctm = ctm;
+			state[1].scissor = bbox;
+#ifdef DUMP_GROUP_BLENDS
+			dump_spaces(dev->top-1, "Tile begin (cached)\n");
+#endif
+			fz_drop_tile_record(ctx, tile);
+			return 1;
+		}
+	}
+	/* Patterns can be transparent, so we need to have an alpha here. */
+	state[1].dest = dest = fz_new_pixmap_with_bbox(ctx, model, bbox, state[0].dest->seps, 1);
+	fz_clear_pixmap(ctx, dest);
+	shape = state[0].shape;
+	if (shape)
+	{
+		state[1].shape = shape = fz_new_pixmap_with_bbox(ctx, NULL, bbox, NULL, 1);
+		fz_clear_pixmap(ctx, shape);
+	}
+	group_alpha = state[0].group_alpha;
+	if (group_alpha)
+	{
+		state[1].group_alpha = group_alpha = fz_new_pixmap_with_bbox(ctx, NULL, bbox, NULL, 1);
+		fz_clear_pixmap(ctx, group_alpha);
+	}
+	state[1].blendmode |= FZ_BLEND_ISOLATED;
+	state[1].xstep = xstep;
+	state[1].ystep = ystep;
+	state[1].id = id;
+	state[1].doc_id = doc_id;
+	state[1].encache = 1;
+	state[1].area = fz_irect_from_rect(area);
+	state[1].ctm = ctm;
+	state[1].scissor = bbox;
+#ifdef DUMP_GROUP_BLENDS
+	dump_spaces(dev->top-1, "Tile begin\n");
+#endif
+	return 0;
+}
+static void
+fz_draw_end_tile(fz_context *ctx, fz_device *devp)
+{
+	fz_draw_device *dev = (fz_draw_device*)devp;
+	float xstep, ystep;
+	fz_matrix ttm, ctm, shapectm, gactm;
+	fz_irect area, scissor, tile_bbox;
+	fz_rect scissor_tmp, tile_tmp;
+	int x0, y0, x1, y1, x, y, extra_x, extra_y;
+	fz_draw_state *state;
+	fz_pixmap *dest = NULL;
+	fz_pixmap *shape = NULL;
+	fz_pixmap *group_alpha = NULL;
+	if (dev->top == 0)
+		fz_throw(ctx, FZ_ERROR_ARGUMENT, "unexpected end tile");
+	state = pop_stack(ctx, dev, "tile");
+	dev->flags = state[1].flags;
+	xstep = state[1].xstep;
+	ystep = state[1].ystep;
+	area = state[1].area;
+	ctm = state[1].ctm;
+	/* Fudge the scissor bbox a little to allow for inaccuracies in the
+	 * matrix inversion. */
+	ttm = fz_invert_matrix(ctm);
+	scissor_tmp = fz_rect_from_irect(state[0].scissor);
+	scissor_tmp = fz_expand_rect(scissor_tmp, 1);
+	scissor_tmp = fz_transform_rect(scissor_tmp, ttm);
+	scissor = fz_irect_from_rect(scissor_tmp);
+	area = fz_intersect_irect(area, scissor);
+	tile_bbox.x0 = state[1].dest->x;
+	tile_bbox.y0 = state[1].dest->y;
+	tile_bbox.x1 = state[1].dest->w + tile_bbox.x0;
+	tile_bbox.y1 = state[1].dest->h + tile_bbox.y0;
+	tile_tmp = fz_rect_from_irect(tile_bbox);
+	tile_tmp = fz_expand_rect(tile_tmp, 1);
+	tile_tmp = fz_transform_rect(tile_tmp, ttm);
+	/* FIXME: area is a bbox, so FP not appropriate here */
+	/* In PDF files xstep/ystep can be smaller than view (the area of a
+	 * single tile) (see fts_15_1506.pdf for an example). This means that
+	 * we have to bias the left hand/bottom edge calculations by the
+	 * difference between the step and the width/height of the tile. */
+	/* scissor, xstep and area are all in pattern space. */
+	extra_x = tile_tmp.x1 - tile_tmp.x0 - xstep;
+	if (extra_x < 0)
+		extra_x = 0;
+	extra_y = tile_tmp.y1 - tile_tmp.y0 - ystep;
+	if (extra_y < 0)
+		extra_y = 0;
+	x0 = floorf((area.x0 - tile_tmp.x0 - extra_x) / xstep);
+	y0 = floorf((area.y0 - tile_tmp.y0 - extra_y) / ystep);
+	x1 = ceilf((area.x1 - tile_tmp.x0 + extra_x) / xstep);
+	y1 = ceilf((area.y1 - tile_tmp.y0 + extra_y) / ystep);
+	ctm.e = state[1].dest->x;
+	ctm.f = state[1].dest->y;
+	if (state[1].shape)
+	{
+		shapectm = ctm;
+		shapectm.e = state[1].shape->x;
+		shapectm.f = state[1].shape->y;
+	}
+	if (state[1].group_alpha)
+	{
+		gactm = ctm;
+		gactm.e = state[1].group_alpha->x;
+		gactm.f = state[1].group_alpha->y;
+	}
+#ifdef DUMP_GROUP_BLENDS
+	dump_spaces(dev->top, "");
+	fz_dump_blend(ctx, "Tiling ", state[1].dest);
+	if (state[1].shape)
+		fz_dump_blend(ctx, "/S=", state[1].shape);
+	if (state[1].group_alpha)
+		fz_dump_blend(ctx, "/GA=", state[1].group_alpha);
+	fz_dump_blend(ctx, " onto ", state[0].dest);
+	if (state[0].shape)
+		fz_dump_blend(ctx, "/S=", state[0].shape);
+	if (state[0].group_alpha)
+		fz_dump_blend(ctx, "/GA=", state[0].group_alpha);
+#endif
+	fz_var(dest);
+	fz_var(shape);
+	fz_var(group_alpha);
+	fz_try(ctx)
+	{
+		dest = fz_new_pixmap_from_pixmap(ctx, state[1].dest, NULL);
+		shape = fz_new_pixmap_from_pixmap(ctx, state[1].shape, NULL);
+		group_alpha = fz_new_pixmap_from_pixmap(ctx, state[1].group_alpha, NULL);
+		for (y = y0; y < y1; y++)
+		{
+			for (x = x0; x < x1; x++)
+			{
+				ttm = fz_pre_translate(ctm, x * xstep, y * ystep);
+				dest->x = ttm.e;
+				dest->y = ttm.f;
+				/* Check for overflow due to float -> int conversions */
+				if (dest->x > 0 && dest->x + dest->w < 0)
+					continue;
+				if (dest->y > 0 && dest->y + dest->h < 0)
+					continue;
+				fz_paint_pixmap_with_bbox(state[0].dest, dest, 255, state[0].scissor);
+				if (shape)
+				{
+					ttm = fz_pre_translate(shapectm, x * xstep, y * ystep);
+					shape->x = ttm.e;
+					shape->y = ttm.f;
+					fz_paint_pixmap_with_bbox(state[0].shape, shape, 255, state[0].scissor);
+				}
+				if (group_alpha)
+				{
+					ttm = fz_pre_translate(gactm, x * xstep, y * ystep);
+					group_alpha->x = ttm.e;
+					group_alpha->y = ttm.f;
+					fz_paint_pixmap_with_bbox(state[0].group_alpha, group_alpha, 255, state[0].scissor);
+				}
+			}
+		}
+		/* Now we try to cache the tiles. Any failure here will just result in us not caching. */
+		if (state[1].encache && state[1].id != 0)
+		{
+			tile_record *tile = NULL;
+			tile_key *key = NULL;
+			fz_var(tile);
+			fz_var(key);
+			fz_try(ctx)
+			{
+				tile_record *existing_tile;
+				tile = fz_new_tile_record(ctx, state[1].dest, state[1].shape, state[1].group_alpha);
+				key = fz_malloc_struct(ctx, tile_key);
+				key->refs = 1;
+				key->id = state[1].id;
+				key->doc_id = state[1].doc_id;
+				key->ctm[0] = ctm.a;
+				key->ctm[1] = ctm.b;
+				key->ctm[2] = ctm.c;
+				key->ctm[3] = ctm.d;
+				key->cs = fz_keep_colorspace_store_key(ctx, state[1].dest->colorspace);
+				key->has_shape = (state[1].shape != NULL);
+				key->has_group_alpha = (state[1].group_alpha != NULL);
+				existing_tile = fz_store_item(ctx, key, tile, fz_tile_size(ctx, tile), &fz_tile_store_type);
+				if (existing_tile)
+				{
+					/* We already have a tile. This will either have been
+					 * produced by a racing thread, or there is already
+					 * an entry for this one in the store. */
+					fz_drop_tile_record(ctx, tile);
+					tile = existing_tile;
+				}
+			}
+			fz_always(ctx)
+			{
+				fz_drop_tile_key(ctx, key);
+				fz_drop_tile_record(ctx, tile);
+			}
+			fz_catch(ctx)
+			{
+				/* Do nothing */
+			}
+		}
+	}
+	fz_always(ctx)
+	{
+		cleanup_post_pop(ctx, state);
+		fz_drop_pixmap(ctx, dest);
+		fz_drop_pixmap(ctx, shape);
+		fz_drop_pixmap(ctx, group_alpha);
+	}
+	fz_catch(ctx)
+		fz_rethrow(ctx);
+#ifdef DUMP_GROUP_BLENDS
+	fz_dump_blend(ctx, " to get ", state[0].dest);
+	if (state[0].shape)
+		fz_dump_blend(ctx, "/S=", state[0].shape);
+	if (state[0].group_alpha)
+		fz_dump_blend(ctx, "/GA=", state[0].group_alpha);
+	printf("\n");
+#endif
+	if (state->blendmode & FZ_BLEND_KNOCKOUT)
+		fz_knockout_end(ctx, dev);
+}
+static void
+fz_draw_render_flags(fz_context *ctx, fz_device *devp, int set, int clear)
+{
+	fz_draw_device *dev = (fz_draw_device*)devp;
+	dev->flags = (dev->flags | set ) & ~clear;
+}
+static void
+fz_draw_set_default_colorspaces(fz_context *ctx, fz_device *devp, fz_default_colorspaces *default_cs)
+{
+	fz_draw_device *dev = (fz_draw_device*)devp;
+	fz_drop_default_colorspaces(ctx, dev->default_cs);
+	dev->default_cs = fz_keep_default_colorspaces(ctx, default_cs);
+}
+static void
+fz_draw_close_device(fz_context *ctx, fz_device *devp)
+{
+	fz_draw_device *dev = (fz_draw_device*)devp;
+	/* pop and free the stacks */
+	if (dev->top > dev->resolve_spots)
+		fz_throw(ctx, FZ_ERROR_ARGUMENT, "items left on stack in draw device: %d", dev->top);
+	if (dev->resolve_spots && dev->top)
+	{
+		fz_draw_state *state = &dev->stack[--dev->top];
+		fz_try(ctx)
+		{
+			fz_copy_pixmap_area_converting_seps(ctx, state[1].dest, state[0].dest, dev->proof_cs, fz_default_color_params, dev->default_cs);
+			assert(state[1].mask == NULL);
+			assert(state[1].shape == NULL);
+			assert(state[1].group_alpha == NULL);
+		}
+		fz_always(ctx)
+		{
+			fz_drop_pixmap(ctx, state[1].dest);
+			state[1].dest = NULL;
+		}
+		fz_catch(ctx)
+			fz_rethrow(ctx);
+	}
+}
+static void
+fz_draw_drop_device(fz_context *ctx, fz_device *devp)
+{
+	fz_draw_device *dev = (fz_draw_device*)devp;
+	fz_rasterizer *rast = dev->rast;
+	fz_drop_default_colorspaces(ctx, dev->default_cs);
+	fz_drop_colorspace(ctx, dev->proof_cs);
+	/* pop and free the stacks */
+	for (; dev->top > 0; dev->top--)
+	{
+		fz_draw_state *state = &dev->stack[dev->top - 1];
+		if (state[1].mask != state[0].mask)
+			fz_drop_pixmap(ctx, state[1].mask);
+		if (state[1].dest != state[0].dest)
+			fz_drop_pixmap(ctx, state[1].dest);
+		if (state[1].shape != state[0].shape)
+			fz_drop_pixmap(ctx, state[1].shape);
+		if (state[1].group_alpha != state[0].group_alpha)
+			fz_drop_pixmap(ctx, state[1].group_alpha);
+	}
+	/* We never free the dest/mask/shape at level 0, as:
+	 * 1) dest is passed in and ownership remains with the caller.
+	 * 2) shape and mask are NULL at level 0.
+	 */
+	if (dev->stack != &dev->init_stack[0])
+		fz_free(ctx, dev->stack);
+	fz_drop_scale_cache(ctx, dev->cache_x);
+	fz_drop_scale_cache(ctx, dev->cache_y);
+	fz_drop_rasterizer(ctx, rast);
+	fz_drop_shade_color_cache(ctx, dev->shade_cache);
+}
+static fz_device *
+new_draw_device(fz_context *ctx, fz_matrix transform, fz_pixmap *dest, const fz_aa_context *aa, const fz_irect *clip, fz_colorspace *proof_cs)
+{
+	fz_draw_device *dev = fz_new_derived_device(ctx, fz_draw_device);
+	dev->super.drop_device = fz_draw_drop_device;
+	dev->super.close_device = fz_draw_close_device;
+	dev->super.fill_path = fz_draw_fill_path;
+	dev->super.stroke_path = fz_draw_stroke_path;
+	dev->super.clip_path = fz_draw_clip_path;
+	dev->super.clip_stroke_path = fz_draw_clip_stroke_path;
+	dev->super.fill_text = fz_draw_fill_text;
+	dev->super.stroke_text = fz_draw_stroke_text;
+	dev->super.clip_text = fz_draw_clip_text;
+	dev->super.clip_stroke_text = fz_draw_clip_stroke_text;
+	dev->super.ignore_text = fz_draw_ignore_text;
+	dev->super.fill_image_mask = fz_draw_fill_image_mask;
+	dev->super.clip_image_mask = fz_draw_clip_image_mask;
+	dev->super.fill_image = fz_draw_fill_image;
+	dev->super.fill_shade = fz_draw_fill_shade;
+	dev->super.pop_clip = fz_draw_pop_clip;
+	dev->super.begin_mask = fz_draw_begin_mask;
+	dev->super.end_mask = fz_draw_end_mask;
+	dev->super.begin_group = fz_draw_begin_group;
+	dev->super.end_group = fz_draw_end_group;
+	dev->super.begin_tile = fz_draw_begin_tile;
+	dev->super.end_tile = fz_draw_end_tile;
+	dev->super.render_flags = fz_draw_render_flags;
+	dev->super.set_default_colorspaces = fz_draw_set_default_colorspaces;
+	dev->proof_cs = fz_keep_colorspace(ctx, proof_cs);
+	dev->transform = transform;
+	dev->flags = 0;
+	dev->resolve_spots = 0;
+	dev->top = 0;
+	dev->stack = &dev->init_stack[0];
+	dev->stack_cap = STACK_SIZE;
+	dev->stack[0].dest = dest;
+	dev->stack[0].shape = NULL;
+	dev->stack[0].group_alpha = NULL;
+	dev->stack[0].mask = NULL;
+	dev->stack[0].blendmode = 0;
+	dev->stack[0].scissor.x0 = dest->x;
+	dev->stack[0].scissor.y0 = dest->y;
+	dev->stack[0].scissor.x1 = dest->x + dest->w;
+	dev->stack[0].scissor.y1 = dest->y + dest->h;
+	dev->stack[0].flags = dev->flags;
+	if (clip)
+	{
+		if (clip->x0 > dev->stack[0].scissor.x0)
+			dev->stack[0].scissor.x0 = clip->x0;
+		if (clip->x1 < dev->stack[0].scissor.x1)
+			dev->stack[0].scissor.x1 = clip->x1;
+		if (clip->y0 > dev->stack[0].scissor.y0)
+			dev->stack[0].scissor.y0 = clip->y0;
+		if (clip->y1 < dev->stack[0].scissor.y1)
+			dev->stack[0].scissor.y1 = clip->y1;
+	}
+	/* If we have no separations structure at all, then we want a
+	 * simple composite rendering (with no overprint simulation).
+	 * If we do have a separations structure, so: 1) Any
+	 * 'disabled' separations are ignored. 2) Any 'composite'
+	 * separations means we will need to do an overprint
+	 * simulation.
+	 *
+	 * The supplied pixmaps 's' will match the number of
+	 * 'spots' separations. If we have any 'composite'
+	 * separations therefore, we'll need to make a new pixmap
+	 * with a new (completely 'spots') separations structure,
+	 * render to that, and then map down at the end.
+	 *
+	 * Unfortunately we can't produce this until we know what
+	 * the default_colorspaces etc are, so set a flag for us
+	 * to trigger on later.
+	 */
+	if (dest->seps || dev->proof_cs != NULL)
+#if FZ_ENABLE_SPOT_RENDERING
+		dev->resolve_spots = 1;
+#else
+		fz_throw(ctx, FZ_ERROR_ARGUMENT, "Spot rendering (and overprint/overprint simulation) not available in this build");
+#endif
+	dev->overprint_possible = (dest->seps != NULL);
+	fz_try(ctx)
+	{
+		dev->rast = fz_new_rasterizer(ctx, aa);
+		dev->cache_x = fz_new_scale_cache(ctx);
+		dev->cache_y = fz_new_scale_cache(ctx);
+	}
+	fz_catch(ctx)
+	{
+		fz_drop_device(ctx, (fz_device*)dev);
+		fz_rethrow(ctx);
+	}
+	return (fz_device*)dev;
+}
+fz_device *
+fz_new_draw_device(fz_context *ctx, fz_matrix transform, fz_pixmap *dest)
+{
+	return new_draw_device(ctx, transform, dest, NULL, NULL, NULL);
+}
+fz_device *
+fz_new_draw_device_with_bbox(fz_context *ctx, fz_matrix transform, fz_pixmap *dest, const fz_irect *clip)
+{
+	return new_draw_device(ctx, transform, dest, NULL, clip, NULL);
+}
+fz_device *
+fz_new_draw_device_with_proof(fz_context *ctx, fz_matrix transform, fz_pixmap *dest, fz_colorspace *cs)
+{
+	return new_draw_device(ctx, transform, dest, NULL, NULL, cs);
+}
+fz_device *
+fz_new_draw_device_with_bbox_proof(fz_context *ctx, fz_matrix transform, fz_pixmap *dest, const fz_irect *clip, fz_colorspace *cs)
+{
+	return new_draw_device(ctx, transform, dest, NULL, clip, cs);
+}
+fz_device *
+fz_new_draw_device_type3(fz_context *ctx, fz_matrix transform, fz_pixmap *dest)
+{
+	fz_draw_device *dev = (fz_draw_device*)fz_new_draw_device(ctx, transform, dest);
+	dev->flags |= FZ_DRAWDEV_FLAGS_TYPE3;
+	return (fz_device*)dev;
+}
+fz_irect *
+fz_bound_path_accurate(fz_context *ctx, fz_irect *bbox, fz_irect scissor, const fz_path *path, const fz_stroke_state *stroke, fz_matrix ctm, float flatness, float linewidth)
+{
+	fz_rasterizer *rast = fz_new_rasterizer(ctx, NULL);
+	fz_try(ctx)
+	{
+		if (stroke)
+			(void)fz_flatten_stroke_path(ctx, rast, path, stroke, ctm, flatness, linewidth, scissor, bbox);
+		else
+			(void)fz_flatten_fill_path(ctx, rast, path, ctm, flatness, scissor, bbox);
+	}
+	fz_always(ctx)
+		fz_drop_rasterizer(ctx, rast);
+	fz_catch(ctx)
+		fz_rethrow(ctx);
+	return bbox;
+}
+const char *fz_draw_options_usage =
+	"Raster output options:\n"
+	"\trotate=N: rotate rendered pages N degrees counterclockwise\n"
+	"\tresolution=N: set both X and Y resolution in pixels per inch\n"
+	"\tx-resolution=N: X resolution of rendered pages in pixels per inch\n"
+	"\ty-resolution=N: Y resolution of rendered pages in pixels per inch\n"
+	"\twidth=N: render pages to fit N pixels wide (ignore resolution option)\n"
+	"\theight=N: render pages to fit N pixels tall (ignore resolution option)\n"
+	"\tcolorspace=(gray|rgb|cmyk): render using specified colorspace\n"
+	"\talpha: render pages with alpha channel and transparent background\n"
+	"\tgraphics=(aaN|cop|app): set the rasterizer to use\n"
+	"\ttext=(aaN|cop|app): set the rasterizer to use for text\n"
+	"\t\taaN=antialias with N bits (0 to 8)\n"
+	"\t\tcop=center of pixel\n"
+	"\t\tapp=any part of pixel\n"
+	"\n";
+static int parse_aa_opts(const char *val)
+{
+	if (fz_option_eq(val, "cop"))
+		return 9;
+	if (fz_option_eq(val, "app"))
+		return 10;
+	if (val[0] == 'a' && val[1] == 'a' && val[2] >= '0' && val[2] <= '9')
+		return  fz_clampi(fz_atoi(&val[2]), 0, 8);
+	return 8;
+}
+fz_draw_options *
+fz_parse_draw_options(fz_context *ctx, fz_draw_options *opts, const char *args)
+{
+	const char *val;
+	memset(opts, 0, sizeof *opts);
+	opts->x_resolution = 96;
+	opts->y_resolution = 96;
+	opts->rotate = 0;
+	opts->width = 0;
+	opts->height = 0;
+	opts->colorspace = fz_device_rgb(ctx);
+	opts->alpha = 0;
+	opts->graphics = fz_aa_level(ctx);
+	opts->text = fz_text_aa_level(ctx);
+	if (fz_has_option(ctx, args, "rotate", &val))
+		opts->rotate = fz_atoi(val);
+	if (fz_has_option(ctx, args, "resolution", &val))
+		opts->x_resolution = opts->y_resolution = fz_atoi(val);
+	if (fz_has_option(ctx, args, "x-resolution", &val))
+		opts->x_resolution = fz_atoi(val);
+	if (fz_has_option(ctx, args, "y-resolution", &val))
+		opts->y_resolution = fz_atoi(val);
+	if (fz_has_option(ctx, args, "width", &val))
+		opts->width = fz_atoi(val);
+	if (fz_has_option(ctx, args, "height", &val))
+		opts->height = fz_atoi(val);
+	if (fz_has_option(ctx, args, "colorspace", &val))
+	{
+		if (fz_option_eq(val, "gray") || fz_option_eq(val, "grey") || fz_option_eq(val, "mono"))
+			opts->colorspace = fz_device_gray(ctx);
+		else if (fz_option_eq(val, "rgb"))
+			opts->colorspace = fz_device_rgb(ctx);
+		else if (fz_option_eq(val, "cmyk"))
+			opts->colorspace = fz_device_cmyk(ctx);
+		else
+			fz_throw(ctx, FZ_ERROR_ARGUMENT, "unknown colorspace in options");
+	}
+	if (fz_has_option(ctx, args, "alpha", &val))
+		opts->alpha = fz_option_eq(val, "yes");
+	if (fz_has_option(ctx, args, "graphics", &val))
+		opts->text = opts->graphics = parse_aa_opts(val);
+	if (fz_has_option(ctx, args, "text", &val))
+		opts->text = parse_aa_opts(val);
+	/* Sanity check values */
+	if (opts->x_resolution <= 0) opts->x_resolution = 96;
+	if (opts->y_resolution <= 0) opts->y_resolution = 96;
+	if (opts->width < 0) opts->width = 0;
+	if (opts->height < 0) opts->height = 0;
+	return opts;
+}
+fz_device *
+fz_new_draw_device_with_options(fz_context *ctx, const fz_draw_options *opts, fz_rect mediabox, fz_pixmap **pixmap)
+{
+	fz_aa_context aa = ctx->aa;
+	float x_zoom = opts->x_resolution / 72.0f;
+	float y_zoom = opts->y_resolution / 72.0f;
+	float page_w = mediabox.x1 - mediabox.x0;
+	float page_h = mediabox.y1 - mediabox.y0;
+	float w = opts->width;
+	float h = opts->height;
+	float x_scale, y_scale;
+	fz_matrix transform;
+	fz_irect bbox;
+	fz_device *dev;
+	fz_set_rasterizer_graphics_aa_level(ctx, &aa, opts->graphics);
+	fz_set_rasterizer_text_aa_level(ctx, &aa, opts->text);
+	if (w > 0)
+	{
+		x_scale = w / page_w;
+		if (h > 0)
+			y_scale = h / page_h;
+		else
+			y_scale = floorf(page_h * x_scale + 0.5f) / page_h;
+	}
+	else if (h > 0)
+	{
+		y_scale = h / page_h;
+		x_scale = floorf(page_w * y_scale + 0.5f) / page_w;
+	}
+	else
+	{
+		x_scale = floorf(page_w * x_zoom + 0.5f) / page_w;
+		y_scale = floorf(page_h * y_zoom + 0.5f) / page_h;
+	}
+	transform = fz_pre_rotate(fz_scale(x_scale, y_scale), opts->rotate);
+	bbox = fz_irect_from_rect(fz_transform_rect(mediabox, transform));
+	*pixmap = fz_new_pixmap_with_bbox(ctx, opts->colorspace, bbox, NULL, opts->alpha);
+	fz_try(ctx)
+	{
+		fz_set_pixmap_resolution(ctx, *pixmap, opts->x_resolution, opts->y_resolution);
+		if (opts->alpha)
+			fz_clear_pixmap(ctx, *pixmap);
+		else
+			fz_clear_pixmap_with_value(ctx, *pixmap, 255);
+		dev = new_draw_device(ctx, transform, *pixmap, &aa, NULL, NULL);
+	}
+	fz_catch(ctx)
+	{
+		fz_drop_pixmap(ctx, *pixmap);
+		*pixmap = NULL;
+		fz_rethrow(ctx);
+	}
+	return dev;
+}
+static int
+drop_tile_doc(fz_context *ctx, void *doc_id, void *key_)
+{
+	tile_key *key = (tile_key *)key_;
+	return (key->doc_id == (int)(intptr_t)doc_id);
+}
+void
+fz_drop_drawn_tiles_for_document(fz_context *ctx, fz_document *doc)
+{
+	fz_filter_store(ctx, drop_tile_doc, (void *)(intptr_t)doc->id, &fz_tile_store_type);
+}

Mercurial > hgrepos > Python2 > PyMuPDF

comparison mupdf-source/source/fitz/draw-device.c @ 2:b50eed0cc0ef upstream