--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/mupdf-source/platform/gl/gl-app.h	Mon Sep 15 11:43:07 2025 +0200
@@ -0,0 +1,334 @@
+// Copyright (C) 2004-2022 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.
+
+#ifndef MUPDF_GL_APP_H
+#define MUPDF_GL_APP_H
+
+#ifdef _WIN32
+#include <windows.h>
+void win_install(void);
+#endif
+
+#include "mupdf/fitz.h"
+#include "mupdf/ucdn.h"
+#include "mupdf/pdf.h" /* for pdf specifics and forms */
+
+#ifndef __APPLE__
+#include <GL/freeglut.h>
+#else
+#include <GLUT/glut.h>
+#endif
+
+/* UI */
+
+enum
+{
+	/* regular control characters */
+	KEY_ESCAPE = 27,
+	KEY_ENTER = '\r',
+	KEY_TAB = '\t',
+	KEY_BACKSPACE = '\b',
+	KEY_DELETE = 127,
+
+	KEY_CTL_A = 'A' - 64,
+	KEY_CTL_B, KEY_CTL_C, KEY_CTL_D, KEY_CTL_E, KEY_CTL_F,
+	KEY_CTL_G, KEY_CTL_H, KEY_CTL_I, KEY_CTL_J, KEY_CTL_K, KEY_CTL_L,
+	KEY_CTL_M, KEY_CTL_N, KEY_CTL_O, KEY_CTL_P, KEY_CTL_Q, KEY_CTL_R,
+	KEY_CTL_S, KEY_CTL_T, KEY_CTL_U, KEY_CTL_V, KEY_CTL_W, KEY_CTL_X,
+	KEY_CTL_Y, KEY_CTL_Z,
+
+	/* reuse control characters > 127 for special keys */
+	KEY_INSERT = 128,
+	KEY_PAGE_UP,
+	KEY_PAGE_DOWN,
+	KEY_HOME,
+	KEY_END,
+	KEY_LEFT,
+	KEY_UP,
+	KEY_RIGHT,
+	KEY_DOWN,
+	KEY_F1,
+	KEY_F2,
+	KEY_F3,
+	KEY_F4,
+	KEY_F5,
+	KEY_F6,
+	KEY_F7,
+	KEY_F8,
+	KEY_F9,
+	KEY_F10,
+	KEY_F11,
+	KEY_F12,
+};
+
+enum side { ALL, T, R, B, L };
+enum fill { NONE = 0, X = 1, Y = 2, BOTH = 3 };
+enum anchor { CENTER, N, NE, E, SE, S, SW, W, NW };
+
+struct layout
+{
+	enum side side;
+	enum fill fill;
+	enum anchor anchor;
+	int padx, pady;
+};
+
+struct ui
+{
+	int window_w, window_h;
+
+	int x, y;
+	int down, down_x, down_y;
+	int middle, middle_x, middle_y;
+	int right, right_x, right_y;
+
+	int scroll_x, scroll_y;
+	int key, mod, plain;
+
+	int grab_down, grab_middle, grab_right;
+	const void *hot, *active, *focus;
+	int last_cursor, cursor;
+
+	float scale;
+	int fontsize;
+	int baseline;
+	int lineheight;
+	int gridsize;
+	int padsize;
+
+	struct layout *layout;
+	fz_irect *cavity;
+	struct layout layout_stack[32];
+	fz_irect cavity_stack[32];
+
+	int overlay;
+	GLuint overlay_list;
+
+	void (*dialog)(void);
+
+	pdf_annot *selected_annot;
+};
+
+extern struct ui ui;
+
+void ui_init_dpi(float override_ui_scale);
+void ui_init(int w, int h, const char *title);
+void ui_quit(void);
+void ui_invalidate(void);
+void ui_finish(void);
+
+void ui_set_clipboard(const char *buf);
+const char *ui_get_clipboard(void);
+
+void ui_init_fonts(void);
+void ui_finish_fonts(void);
+
+void ui_draw_string(float x, float y, const char *str);
+void ui_draw_string_part(float x, float y, const char *s, const char *e);
+void ui_draw_character(float x, float y, int c);
+float ui_measure_character(int ucs);
+float ui_measure_string(const char *str);
+float ui_measure_string_part(const char *s, const char *e);
+
+struct line { char *a, *b; };
+
+int ui_break_lines(char *a, struct line *lines, int nlines, int width, int *maxwidth);
+void ui_draw_lines(float x, float y, struct line *lines, int n);
+
+struct texture
+{
+	GLuint id;
+	int x, y, w, h;
+	float s, t;
+};
+
+void ui_texture_from_pixmap(struct texture *tex, fz_pixmap *pix);
+void ui_draw_image(struct texture *tex, float x, float y);
+
+enum
+{
+	UI_INPUT_NONE = 0,
+	UI_INPUT_EDIT = 1,
+	UI_INPUT_ACCEPT = 2,
+};
+
+#define UI_INPUT_SIZE (16*1024)
+
+struct input
+{
+	char text[UI_INPUT_SIZE];
+	char *end, *p, *q;
+	int scroll;
+	pdf_annot *widget;
+};
+
+#define UI_READLINE_SIZE 20
+
+struct readline
+{
+	struct input input;
+	char buffer[UI_READLINE_SIZE][UI_INPUT_SIZE];
+	char *history[UI_READLINE_SIZE];
+	int used;
+	int current;
+};
+
+struct list
+{
+	fz_irect area;
+	int scroll_y;
+	int item_y;
+	int is_tree;
+};
+
+void ui_begin(void);
+void ui_end(void);
+
+int ui_mouse_inside(fz_irect area);
+
+void ui_layout(enum side side, enum fill fill, enum anchor anchor, int padx, int pady);
+fz_irect ui_pack_layout(int slave_w, int slave_h, enum side side, enum fill fill, enum anchor anchor, int padx, int pady);
+fz_irect ui_pack(int slave_w, int slave_h);
+int ui_available_width(void);
+int ui_available_height(void);
+void ui_pack_push(fz_irect cavity);
+void ui_pack_pop(void);
+
+void ui_dialog_begin(int w, int h);
+void ui_dialog_end(void);
+void ui_panel_begin(int w, int h, int padx, int pady, int opaque);
+void ui_panel_end(void);
+
+void ui_spacer(void);
+void ui_splitter(int *start, int *x, int min, int max, enum side side);
+void ui_label(const char *fmt, ...);
+void ui_label_with_scrollbar(char *text, int width, int height, int *scroll, int *sticky);
+
+int ui_button(const char *label);
+/* flags: bit 0 -> disabled. all other bits 0 for now. */
+int ui_button_aux(const char *label, int flags);
+int ui_checkbox(const char *label, int *value);
+int ui_checkbox_aux(const char *label, int *value, int flags);
+int ui_slider(int *value, int min, int max, int width);
+int ui_select(const void *id, const char *current, const char *options[], int n);
+int ui_select_aux(const void *id, const char *current, const char *options[], int n, int flags);
+
+void ui_input_init(struct input *input, const char *text);
+int ui_input(struct input *input, int width, int height);
+void ui_scrollbar(int x0, int y0, int x1, int y1, int *value, int page_size, int max, int *sticky);
+
+void ui_readline_init(struct readline *readline, const char *text);
+const char *ui_readline(struct readline *readline, int width);
+
+void ui_tree_begin(struct list *list, int count, int req_w, int req_h, int is_tree);
+int ui_tree_item(struct list *list, const void *id, const char *label, int selected, int depth, int is_branch, int *is_open);
+void ui_tree_end(struct list *list);
+
+void ui_list_begin(struct list *list, int count, int req_w, int req_h);
+int ui_list_item(struct list *list, const void *id, const char *label, int selected);
+void ui_list_end(struct list *list);
+
+int ui_popup(const void *id, const char *label, int is_button, int count);
+int ui_popup_item(const char *title);
+int ui_popup_aux(const void *id, const char *label, int is_button, int count, int flags);
+int ui_popup_item_aux(const char *title, int flags);
+void ui_popup_end(void);
+
+void ui_init_open_file(const char *dir, int (*filter)(const char *fn));
+int ui_open_file(char *filename, const char *label);
+void ui_init_save_file(const char *path, int (*filter)(const char *fn));
+int ui_save_file(char *filename, void (*extra_panel)(void), const char *label);
+
+void ui_show_warning_dialog(const char *fmt, ...);
+void ui_show_error_dialog(const char *fmt, ...);
+
+void ui_select_annot(pdf_annot *annot);
+
+/* Theming */
+
+enum
+{
+	UI_COLOR_PANEL = 0xc0c0c0,
+	UI_COLOR_BUTTON = 0xc0c0c0,
+	UI_COLOR_SCROLLBAR = 0xdfdfdf,
+	UI_COLOR_TEXT_BG = 0xffffff,
+	UI_COLOR_TEXT_FG = 0x000000,
+	UI_COLOR_TEXT_GRAY = 0x808080,
+	UI_COLOR_TEXT_SEL_BG = 0x000080,
+	UI_COLOR_TEXT_SEL_FG = 0xffffff,
+	UI_COLOR_BEVEL_1 = 0x000000,
+	UI_COLOR_BEVEL_2 = 0x808080,
+	UI_COLOR_BEVEL_3 = 0xdfdfdf,
+	UI_COLOR_BEVEL_4 = 0xffffff,
+};
+
+void glColorHex(unsigned int hex);
+void ui_draw_bevel(fz_irect area, int depressed);
+void ui_draw_ibevel(fz_irect area, int depressed);
+void ui_draw_bevel_rect(fz_irect area, unsigned int fill, int depressed);
+void ui_draw_ibevel_rect(fz_irect area, unsigned int fill, int depressed);
+
+/* App */
+
+extern fz_context *ctx;
+extern fz_colorspace *profile;
+extern pdf_document *pdf;
+extern pdf_page *page;
+extern fz_stext_page *page_text;
+extern fz_matrix draw_page_ctm, view_page_ctm, view_page_inv_ctm;
+extern fz_rect page_bounds, draw_page_bounds, view_page_bounds;
+extern fz_irect view_page_area;
+extern char filename[];
+extern int showform;
+extern int showannotate;
+extern int reloadrequested;
+extern char *search_needle;
+extern int search_hit_count;
+extern fz_quad search_hit_quads[];
+extern int page_contents_changed;
+extern int page_annots_changed;
+
+int search_has_results(void);
+enum {
+	ANNOTATE_MODE_NONE = 0,
+	ANNOTATE_MODE_NORMAL = 1,
+	ANNOTATE_MODE_REDACT = 2
+};
+void toggle_annotate(int mode);
+void run_main_loop(void);
+void do_annotate_panel(void);
+void do_annotate_canvas(fz_irect canvas_area);
+void do_redact_panel(void);
+void do_widget_canvas(fz_irect canvas_area);
+void load_page(void);
+void update_title(void);
+void reload_document(void);
+void reload(void);
+void do_save_pdf_file(void);
+void do_save_signed_pdf_file(void);
+int do_sign(void);
+void trace_action(const char *fmt, ...);
+void trace_page_update(void);
+void trace_save_snapshot(void);
+const char *format_date(int64_t secs);
+
+#endif