--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/mupdf-source/source/fitz/bbox-device.c	Mon Sep 15 11:43:07 2025 +0200
@@ -0,0 +1,228 @@
+// 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 <assert.h>
+
+#define STACK_SIZE 96
+
+typedef struct fz_bbox_device_s
+{
+	fz_device super;
+
+	fz_rect *result;
+	int top;
+	fz_rect stack[STACK_SIZE];
+	/* mask content and tiles are ignored */
+	int ignore;
+} fz_bbox_device;
+
+static void
+fz_bbox_add_rect(fz_context *ctx, fz_device *dev, fz_rect rect, int clip)
+{
+	fz_bbox_device *bdev = (fz_bbox_device*)dev;
+
+	if (0 < bdev->top && bdev->top <= STACK_SIZE)
+	{
+		rect = fz_intersect_rect(rect, bdev->stack[bdev->top-1]);
+	}
+	if (!clip && bdev->top <= STACK_SIZE && !bdev->ignore)
+	{
+		*bdev->result = fz_union_rect(*bdev->result, rect);
+	}
+	if (clip && ++bdev->top <= STACK_SIZE)
+	{
+		bdev->stack[bdev->top-1] = rect;
+	}
+}
+
+static void
+fz_bbox_fill_path(fz_context *ctx, fz_device *dev, const fz_path *path, int even_odd, fz_matrix ctm,
+	fz_colorspace *colorspace, const float *color, float alpha, fz_color_params color_params)
+{
+	fz_bbox_add_rect(ctx, dev, fz_bound_path(ctx, path, NULL, ctm), 0);
+}
+
+static void
+fz_bbox_stroke_path(fz_context *ctx, fz_device *dev, const fz_path *path, const fz_stroke_state *stroke,
+	fz_matrix ctm, fz_colorspace *colorspace, const float *color, float alpha, fz_color_params color_params)
+{
+	fz_bbox_add_rect(ctx, dev, fz_bound_path(ctx, path, stroke, ctm), 0);
+}
+
+static void
+fz_bbox_fill_text(fz_context *ctx, fz_device *dev, const fz_text *text, fz_matrix ctm,
+	fz_colorspace *colorspace, const float *color, float alpha, fz_color_params color_params)
+{
+	fz_bbox_add_rect(ctx, dev, fz_bound_text(ctx, text, NULL, ctm), 0);
+}
+
+static void
+fz_bbox_stroke_text(fz_context *ctx, fz_device *dev, const fz_text *text, const fz_stroke_state *stroke,
+	fz_matrix ctm, fz_colorspace *colorspace, const float *color, float alpha, fz_color_params color_params)
+{
+	fz_bbox_add_rect(ctx, dev, fz_bound_text(ctx, text, stroke, ctm), 0);
+}
+
+static void
+fz_bbox_fill_shade(fz_context *ctx, fz_device *dev, fz_shade *shade, fz_matrix ctm, float alpha, fz_color_params color_params)
+{
+	fz_bbox_add_rect(ctx, dev, fz_bound_shade(ctx, shade, ctm), 0);
+}
+
+static void
+fz_bbox_fill_image(fz_context *ctx, fz_device *dev, fz_image *image, fz_matrix ctm, float alpha, fz_color_params color_params)
+{
+	fz_bbox_add_rect(ctx, dev, fz_transform_rect(fz_unit_rect, ctm), 0);
+}
+
+static void
+fz_bbox_fill_image_mask(fz_context *ctx, fz_device *dev, fz_image *image, fz_matrix ctm,
+	fz_colorspace *colorspace, const float *color, float alpha, fz_color_params color_params)
+{
+	fz_bbox_add_rect(ctx, dev, fz_transform_rect(fz_unit_rect, ctm), 0);
+}
+
+static void
+fz_bbox_clip_path(fz_context *ctx, fz_device *dev, const fz_path *path, int even_odd, fz_matrix ctm, fz_rect scissor)
+{
+	fz_bbox_add_rect(ctx, dev, fz_bound_path(ctx, path, NULL, ctm), 1);
+}
+
+static void
+fz_bbox_clip_stroke_path(fz_context *ctx, fz_device *dev, const fz_path *path, const fz_stroke_state *stroke, fz_matrix ctm, fz_rect scissor)
+{
+	fz_bbox_add_rect(ctx, dev, fz_bound_path(ctx, path, stroke, ctm), 1);
+}
+
+static void
+fz_bbox_clip_text(fz_context *ctx, fz_device *dev, const fz_text *text, fz_matrix ctm, fz_rect scissor)
+{
+	fz_bbox_add_rect(ctx, dev, fz_bound_text(ctx, text, NULL, ctm), 1);
+}
+
+static void
+fz_bbox_clip_stroke_text(fz_context *ctx, fz_device *dev, const fz_text *text, const fz_stroke_state *stroke, fz_matrix ctm, fz_rect scissor)
+{
+	fz_bbox_add_rect(ctx, dev, fz_bound_text(ctx, text, stroke, ctm), 1);
+}
+
+static void
+fz_bbox_clip_image_mask(fz_context *ctx, fz_device *dev, fz_image *image, fz_matrix ctm, fz_rect scissor)
+{
+	fz_bbox_add_rect(ctx, dev, fz_transform_rect(fz_unit_rect, ctm), 1);
+}
+
+static void
+fz_bbox_pop_clip(fz_context *ctx, fz_device *dev)
+{
+	fz_bbox_device *bdev = (fz_bbox_device*)dev;
+	if (bdev->top > 0)
+		bdev->top--;
+	else
+		fz_warn(ctx, "unexpected pop clip");
+}
+
+static void
+fz_bbox_begin_mask(fz_context *ctx, fz_device *dev, fz_rect rect, int luminosity, fz_colorspace *colorspace, const float *color, fz_color_params color_params)
+{
+	fz_bbox_device *bdev = (fz_bbox_device*)dev;
+	fz_bbox_add_rect(ctx, dev, rect, 1);
+	bdev->ignore++;
+}
+
+static void
+fz_bbox_end_mask(fz_context *ctx, fz_device *dev, fz_function *tr)
+{
+	fz_bbox_device *bdev = (fz_bbox_device*)dev;
+	assert(bdev->ignore > 0);
+	bdev->ignore--;
+}
+
+static void
+fz_bbox_begin_group(fz_context *ctx, fz_device *dev, fz_rect rect, fz_colorspace *cs, int isolated, int knockout, int blendmode, float alpha)
+{
+	fz_bbox_add_rect(ctx, dev, rect, 1);
+}
+
+static void
+fz_bbox_end_group(fz_context *ctx, fz_device *dev)
+{
+	fz_bbox_pop_clip(ctx, dev);
+}
+
+static int
+fz_bbox_begin_tile(fz_context *ctx, fz_device *dev, fz_rect area, fz_rect view, float xstep, float ystep, fz_matrix ctm, int id, int doc_id)
+{
+	fz_bbox_device *bdev = (fz_bbox_device*)dev;
+	fz_bbox_add_rect(ctx, dev, fz_transform_rect(area, ctm), 0);
+	bdev->ignore++;
+	return 0;
+}
+
+static void
+fz_bbox_end_tile(fz_context *ctx, fz_device *dev)
+{
+	fz_bbox_device *bdev = (fz_bbox_device*)dev;
+	assert(bdev->ignore > 0);
+	bdev->ignore--;
+}
+
+fz_device *
+fz_new_bbox_device(fz_context *ctx, fz_rect *result)
+{
+	fz_bbox_device *dev = fz_new_derived_device(ctx, fz_bbox_device);
+
+	dev->super.fill_path = fz_bbox_fill_path;
+	dev->super.stroke_path = fz_bbox_stroke_path;
+	dev->super.clip_path = fz_bbox_clip_path;
+	dev->super.clip_stroke_path = fz_bbox_clip_stroke_path;
+
+	dev->super.fill_text = fz_bbox_fill_text;
+	dev->super.stroke_text = fz_bbox_stroke_text;
+	dev->super.clip_text = fz_bbox_clip_text;
+	dev->super.clip_stroke_text = fz_bbox_clip_stroke_text;
+
+	dev->super.fill_shade = fz_bbox_fill_shade;
+	dev->super.fill_image = fz_bbox_fill_image;
+	dev->super.fill_image_mask = fz_bbox_fill_image_mask;
+	dev->super.clip_image_mask = fz_bbox_clip_image_mask;
+
+	dev->super.pop_clip = fz_bbox_pop_clip;
+
+	dev->super.begin_mask = fz_bbox_begin_mask;
+	dev->super.end_mask = fz_bbox_end_mask;
+	dev->super.begin_group = fz_bbox_begin_group;
+	dev->super.end_group = fz_bbox_end_group;
+
+	dev->super.begin_tile = fz_bbox_begin_tile;
+	dev->super.end_tile = fz_bbox_end_tile;
+
+	dev->result = result;
+	dev->top = 0;
+	dev->ignore = 0;
+
+	*result = fz_empty_rect;
+
+	return (fz_device*)dev;
+}