src/test-ot-color.cc - third_party/harfbuzz - Git at Google

 /*
  * Copyright © 2018  Ebrahim Byagowi
  * Copyright © 2018  Khaled Hosny
  *
  *  This is part of HarfBuzz, a text shaping library.
  *
  * Permission is hereby granted, without written agreement and without
  * license or royalty fees, to use, copy, modify, and distribute this
  * software and its documentation for any purpose, provided that the
  * above copyright notice and the following two paragraphs appear in
  * all copies of this software.
  *
  * IN NO EVENT SHALL THE COPYRIGHT HOLDER BE LIABLE TO ANY PARTY FOR
  * DIRECT, INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES
  * ARISING OUT OF THE USE OF THIS SOFTWARE AND ITS DOCUMENTATION, EVEN
  * IF THE COPYRIGHT HOLDER HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH
  * DAMAGE.
  *
  * THE COPYRIGHT HOLDER SPECIFICALLY DISCLAIMS ANY WARRANTIES, INCLUDING,
  * BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND
  * FITNESS FOR A PARTICULAR PURPOSE.  THE SOFTWARE PROVIDED HEREUNDER IS
  * ON AN "AS IS" BASIS, AND THE COPYRIGHT HOLDER HAS NO OBLIGATION TO
  * PROVIDE MAINTENANCE, SUPPORT, UPDATES, ENHANCEMENTS, OR MODIFICATIONS.
  */

 #include "hb.h"
 #include "hb-ot.h"

 #include "hb-ft.h"

 #include <ft2build.h>
 #include FT_FREETYPE_H
 #include FT_GLYPH_H

 #include <cairo.h>
 #include <cairo-ft.h>
 #include <cairo-svg.h>

 #include <stdlib.h>
 #include <stdio.h>

 static void
 svg_dump (hb_face_t *face, unsigned int face_index)
 {
   unsigned glyph_count = hb_face_get_glyph_count (face);

   for (unsigned int glyph_id = 0; glyph_id < glyph_count; glyph_id++)
   {
     hb_blob_t *blob = hb_ot_color_glyph_reference_svg (face, glyph_id);

     if (hb_blob_get_length (blob) == 0) continue;

     unsigned int length;
     const char *data = hb_blob_get_data (blob, &length);

     char output_path[255];
     sprintf (output_path, "out/svg-%u-%u.svg%s",
 	     glyph_id,
 	     face_index,
 	     // append "z" if the content is gzipped, https://stackoverflow.com/a/6059405
 	     (length > 2 && (data[0] == '\x1F') && (data[1] == '\x8B')) ? "z" : "");

     FILE *f = fopen (output_path, "wb");
     fwrite (data, 1, length, f);
     fclose (f);

     hb_blob_destroy (blob);
   }
 }

 /* _png API is so easy to use unlike the below code, don't get confused */
 static void
 png_dump (hb_face_t *face, unsigned int face_index)
 {
   unsigned glyph_count = hb_face_get_glyph_count (face);
   hb_font_t *font = hb_font_create (face);

   /* scans the font for strikes */
   unsigned int sample_glyph_id;
   /* we don't care about different strikes for different glyphs at this point */
   for (sample_glyph_id = 0; sample_glyph_id < glyph_count; sample_glyph_id++)
   {
     hb_blob_t *blob = hb_ot_color_glyph_reference_png (font, sample_glyph_id);
     unsigned int blob_length = hb_blob_get_length (blob);
     hb_blob_destroy (blob);
     if (blob_length != 0)
       break;
   }

   unsigned int upem = hb_face_get_upem (face);
   unsigned int blob_length = 0;
   unsigned int strike = 0;
   for (unsigned int ppem = 1; ppem < upem; ppem++)
   {
     hb_font_set_ppem (font, ppem, ppem);
     hb_blob_t *blob = hb_ot_color_glyph_reference_png (font, sample_glyph_id);
     unsigned int new_blob_length = hb_blob_get_length (blob);
     hb_blob_destroy (blob);
     if (new_blob_length != blob_length)
     {
       for (unsigned int glyph_id = 0; glyph_id < glyph_count; glyph_id++)
       {
 	hb_blob_t *blob = hb_ot_color_glyph_reference_png (font, glyph_id);

 	if (hb_blob_get_length (blob) == 0) continue;

 	unsigned int length;
 	const char *data = hb_blob_get_data (blob, &length);

 	char output_path[255];
 	sprintf (output_path, "out/png-%u-%u-%u.png", glyph_id, strike, face_index);

 	FILE *f = fopen (output_path, "wb");
 	fwrite (data, 1, length, f);
 	fclose (f);

 	hb_blob_destroy (blob);
       }

       strike++;
       blob_length = new_blob_length;
     }
   }

   hb_font_destroy (font);
 }

 static void
 layered_glyph_dump (hb_face_t *face, cairo_font_face_t *cairo_face, unsigned int face_index)
 {
   unsigned int upem = hb_face_get_upem (face);

   unsigned glyph_count = hb_face_get_glyph_count (face);
   for (hb_codepoint_t gid = 0; gid < glyph_count; ++gid)
   {
     unsigned int num_layers = hb_ot_color_glyph_get_layers (face, gid, 0, NULL, NULL);
     if (!num_layers)
       continue;

     hb_ot_color_layer_t *layers = (hb_ot_color_layer_t*) malloc (num_layers * sizeof (hb_ot_color_layer_t));

     hb_ot_color_glyph_get_layers (face, gid, 0, &num_layers, layers);
     if (num_layers)
     {
       // Measure
       cairo_text_extents_t extents;
       {
 	cairo_surface_t *surface = cairo_image_surface_create (CAIRO_FORMAT_ARGB32, 1, 1);
 	cairo_t *cr = cairo_create (surface);
 	cairo_set_font_face (cr, cairo_face);
 	cairo_set_font_size (cr, upem);

 	cairo_glyph_t *glyphs = (cairo_glyph_t *) calloc (num_layers, sizeof (cairo_glyph_t));
 	for (unsigned int j = 0; j < num_layers; ++j)
 	  glyphs[j].index = layers[j].glyph;
 	cairo_glyph_extents (cr, glyphs, num_layers, &extents);
 	free (glyphs);
 	cairo_surface_destroy (surface);
 	cairo_destroy (cr);
       }

       // Add a slight margin
       extents.width += extents.width / 10;
       extents.height += extents.height / 10;
       extents.x_bearing -= extents.width / 20;
       extents.y_bearing -= extents.height / 20;

       // Render
       unsigned int palette_count = hb_ot_color_palette_get_count (face);
       for (unsigned int palette = 0; palette < palette_count; palette++)
       {
 	unsigned int num_colors = hb_ot_color_palette_get_colors (face, palette, 0, NULL, NULL);
 	if (!num_colors)
 	  continue;

 	hb_color_t *colors = (hb_color_t*) calloc (num_colors, sizeof (hb_color_t));
 	hb_ot_color_palette_get_colors (face, palette, 0, &num_colors, colors);
 	if (num_colors)
 	{
 	  char output_path[255];
 	  sprintf (output_path, "out/colr-%u-%u-%u.svg", gid, palette, face_index);

 	  cairo_surface_t *surface = cairo_svg_surface_create (output_path, extents.width, extents.height);
 	  cairo_t *cr = cairo_create (surface);
 	  cairo_set_font_face (cr, cairo_face);
 	  cairo_set_font_size (cr, upem);

 	  for (unsigned int layer = 0; layer < num_layers; ++layer)
 	  {
 	    hb_color_t color = 0x000000FF;
 	    if (layers[layer].color_index != 0xFFFF)
 	      color = colors[layers[layer].color_index];
 	    cairo_set_source_rgba (cr,
 				   hb_color_get_red (color) / 255.,
 				   hb_color_get_green (color) / 255.,
 				   hb_color_get_blue (color) / 255.,
 				   hb_color_get_alpha (color) / 255.);

 	    cairo_glyph_t glyph;
 	    glyph.index = layers[layer].glyph;
 	    glyph.x = -extents.x_bearing;
 	    glyph.y = -extents.y_bearing;
 	    cairo_show_glyphs (cr, &glyph, 1);
 	  }

 	  cairo_surface_destroy (surface);
 	  cairo_destroy (cr);
 	}
 	free (colors);
       }
     }

     free (layers);
   }
 }

 static void
 dump_glyphs (cairo_font_face_t *cairo_face, unsigned int upem,
 	     unsigned int num_glyphs, unsigned int face_index)
 {
   for (unsigned int i = 0; i < num_glyphs; ++i)
   {
     cairo_text_extents_t extents;
     cairo_glyph_t glyph = {0};
     glyph.index = i;

     // Measure
     {
       cairo_surface_t *surface = cairo_image_surface_create (CAIRO_FORMAT_ARGB32, 1, 1);
       cairo_t *cr = cairo_create (surface);
       cairo_set_font_face (cr, cairo_face);
       cairo_set_font_size (cr, upem);

       cairo_glyph_extents (cr, &glyph, 1, &extents);
       cairo_surface_destroy (surface);
       cairo_destroy (cr);
     }

     // Add a slight margin
     extents.width += extents.width / 10;
     extents.height += extents.height / 10;
     extents.x_bearing -= extents.width / 20;
     extents.y_bearing -= extents.height / 20;

     // Render
     {
       char output_path[255];
       sprintf (output_path, "out/%u-%u.svg", face_index, i);
       cairo_surface_t *surface = cairo_svg_surface_create (output_path, extents.width, extents.height);
       cairo_t *cr = cairo_create (surface);
       cairo_set_font_face (cr, cairo_face);
       cairo_set_font_size (cr, upem);
       glyph.x = -extents.x_bearing;
       glyph.y = -extents.y_bearing;
       cairo_show_glyphs (cr, &glyph, 1);
       cairo_surface_destroy (surface);
       cairo_destroy (cr);
     }
   }
 }

 int
 main (int argc, char **argv)
 {
   if (argc != 2) {
     fprintf (stderr, "usage: %s font-file.ttf\n"
 		     "run it like `rm -rf out && mkdir out && %s font-file.ttf`\n",
 		     argv[0], argv[0]);
     exit (1);
   }


   FILE *font_name_file = fopen ("out/.dumped_font_name", "r");
   if (font_name_file != NULL)
   {
     fprintf (stderr, "Purge or move ./out folder in order to run a new dump\n");
     exit (1);
   }

   font_name_file = fopen ("out/.dumped_font_name", "w");
   if (font_name_file == NULL)
   {
     fprintf (stderr, "./out is not accessible as a folder, create it please\n");
     exit (1);
   }
   fwrite (argv[1], 1, strlen (argv[1]), font_name_file);
   fclose (font_name_file);

   hb_blob_t *blob = hb_blob_create_from_file (argv[1]);
   unsigned int num_faces = hb_face_count (blob);
   if (num_faces == 0)
   {
     fprintf (stderr, "error: The file (%s) was corrupted, empty or not found", argv[1]);
     exit (1);
   }

   for (unsigned int face_index = 0; face_index < hb_face_count (blob); face_index++)
   {
     hb_face_t *face = hb_face_create (blob, face_index);
     hb_font_t *font = hb_font_create (face);

     if (hb_ot_color_has_png (face)) printf ("Dumping png (cbdt/sbix)...\n");
     png_dump (face, face_index);

     if (hb_ot_color_has_svg (face)) printf ("Dumping svg...\n");
     svg_dump (face, face_index);

     cairo_font_face_t *cairo_face;
     {
       FT_Library library;
       FT_Init_FreeType (&library);
       FT_Face ft_face;
       FT_New_Face (library, argv[1], 0, &ft_face);
       cairo_face = cairo_ft_font_face_create_for_ft_face (ft_face, 0);
     }
     if (hb_ot_color_has_layers (face) && hb_ot_color_has_palettes (face))
       printf ("Dumping layered color glyphs...\n");
     layered_glyph_dump (face, cairo_face, face_index);

     unsigned int num_glyphs = hb_face_get_glyph_count (face);
     unsigned int upem = hb_face_get_upem (face);

     // disabled when color font as cairo rendering of NotoColorEmoji is soooo slow
     if (!hb_ot_color_has_layers (face) &&
         !hb_ot_color_has_png (face) &&
         !hb_ot_color_has_svg (face))
       dump_glyphs (cairo_face, upem, num_glyphs, face_index);

     hb_font_destroy (font);
     hb_face_destroy (face);
     }

   hb_blob_destroy (blob);

   return 0;
 }
	/*
	* Copyright © 2018 Ebrahim Byagowi
	* Copyright © 2018 Khaled Hosny
	*
	* This is part of HarfBuzz, a text shaping library.
	*
	* Permission is hereby granted, without written agreement and without
	* license or royalty fees, to use, copy, modify, and distribute this
	* software and its documentation for any purpose, provided that the
	* above copyright notice and the following two paragraphs appear in
	* all copies of this software.
	*
	* IN NO EVENT SHALL THE COPYRIGHT HOLDER BE LIABLE TO ANY PARTY FOR
	* DIRECT, INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES
	* ARISING OUT OF THE USE OF THIS SOFTWARE AND ITS DOCUMENTATION, EVEN
	* IF THE COPYRIGHT HOLDER HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH
	* DAMAGE.
	*
	* THE COPYRIGHT HOLDER SPECIFICALLY DISCLAIMS ANY WARRANTIES, INCLUDING,
	* BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND
	* FITNESS FOR A PARTICULAR PURPOSE. THE SOFTWARE PROVIDED HEREUNDER IS
	* ON AN "AS IS" BASIS, AND THE COPYRIGHT HOLDER HAS NO OBLIGATION TO
	* PROVIDE MAINTENANCE, SUPPORT, UPDATES, ENHANCEMENTS, OR MODIFICATIONS.
	*/

	#include "hb.h"
	#include "hb-ot.h"

	#include "hb-ft.h"

	#include <ft2build.h>
	#include FT_FREETYPE_H
	#include FT_GLYPH_H

	#include <cairo.h>
	#include <cairo-ft.h>
	#include <cairo-svg.h>

	#include <stdlib.h>
	#include <stdio.h>

	static void
	svg_dump (hb_face_t *face, unsigned int face_index)
	{
	unsigned glyph_count = hb_face_get_glyph_count (face);

	for (unsigned int glyph_id = 0; glyph_id < glyph_count; glyph_id++)
	{
	hb_blob_t *blob = hb_ot_color_glyph_reference_svg (face, glyph_id);

	if (hb_blob_get_length (blob) == 0) continue;

	unsigned int length;
	const char *data = hb_blob_get_data (blob, &length);

	char output_path[255];
	sprintf (output_path, "out/svg-%u-%u.svg%s",
	glyph_id,
	face_index,
	// append "z" if the content is gzipped, https://stackoverflow.com/a/6059405
	(length > 2 && (data[0] == '\x1F') && (data[1] == '\x8B')) ? "z" : "");

	FILE *f = fopen (output_path, "wb");
	fwrite (data, 1, length, f);
	fclose (f);

	hb_blob_destroy (blob);
	}
	}

	/* _png API is so easy to use unlike the below code, don't get confused */
	static void
	png_dump (hb_face_t *face, unsigned int face_index)
	{
	unsigned glyph_count = hb_face_get_glyph_count (face);
	hb_font_t *font = hb_font_create (face);

	/* scans the font for strikes */
	unsigned int sample_glyph_id;
	/* we don't care about different strikes for different glyphs at this point */
	for (sample_glyph_id = 0; sample_glyph_id < glyph_count; sample_glyph_id++)
	{
	hb_blob_t *blob = hb_ot_color_glyph_reference_png (font, sample_glyph_id);
	unsigned int blob_length = hb_blob_get_length (blob);
	hb_blob_destroy (blob);
	if (blob_length != 0)
	break;
	}

	unsigned int upem = hb_face_get_upem (face);
	unsigned int blob_length = 0;
	unsigned int strike = 0;
	for (unsigned int ppem = 1; ppem < upem; ppem++)
	{
	hb_font_set_ppem (font, ppem, ppem);
	hb_blob_t *blob = hb_ot_color_glyph_reference_png (font, sample_glyph_id);
	unsigned int new_blob_length = hb_blob_get_length (blob);
	hb_blob_destroy (blob);
	if (new_blob_length != blob_length)
	{
	for (unsigned int glyph_id = 0; glyph_id < glyph_count; glyph_id++)
	{
	hb_blob_t *blob = hb_ot_color_glyph_reference_png (font, glyph_id);

	if (hb_blob_get_length (blob) == 0) continue;

	unsigned int length;
	const char *data = hb_blob_get_data (blob, &length);

	char output_path[255];
	sprintf (output_path, "out/png-%u-%u-%u.png", glyph_id, strike, face_index);

	FILE *f = fopen (output_path, "wb");
	fwrite (data, 1, length, f);
	fclose (f);

	hb_blob_destroy (blob);
	}

	strike++;
	blob_length = new_blob_length;
	}
	}

	hb_font_destroy (font);
	}

	static void
	layered_glyph_dump (hb_face_t face, cairo_font_face_t cairo_face, unsigned int face_index)
	{
	unsigned int upem = hb_face_get_upem (face);

	unsigned glyph_count = hb_face_get_glyph_count (face);
	for (hb_codepoint_t gid = 0; gid < glyph_count; ++gid)
	{
	unsigned int num_layers = hb_ot_color_glyph_get_layers (face, gid, 0, NULL, NULL);
	if (!num_layers)
	continue;

	hb_ot_color_layer_t layers = (hb_ot_color_layer_t) malloc (num_layers * sizeof (hb_ot_color_layer_t));

	hb_ot_color_glyph_get_layers (face, gid, 0, &num_layers, layers);
	if (num_layers)
	{
	// Measure
	cairo_text_extents_t extents;
	{
	cairo_surface_t *surface = cairo_image_surface_create (CAIRO_FORMAT_ARGB32, 1, 1);
	cairo_t *cr = cairo_create (surface);
	cairo_set_font_face (cr, cairo_face);
	cairo_set_font_size (cr, upem);

	cairo_glyph_t glyphs = (cairo_glyph_t ) calloc (num_layers, sizeof (cairo_glyph_t));
	for (unsigned int j = 0; j < num_layers; ++j)
	glyphs[j].index = layers[j].glyph;
	cairo_glyph_extents (cr, glyphs, num_layers, &extents);
	free (glyphs);
	cairo_surface_destroy (surface);
	cairo_destroy (cr);
	}

	// Add a slight margin
	extents.width += extents.width / 10;
	extents.height += extents.height / 10;
	extents.x_bearing -= extents.width / 20;
	extents.y_bearing -= extents.height / 20;

	// Render
	unsigned int palette_count = hb_ot_color_palette_get_count (face);
	for (unsigned int palette = 0; palette < palette_count; palette++)
	{
	unsigned int num_colors = hb_ot_color_palette_get_colors (face, palette, 0, NULL, NULL);
	if (!num_colors)
	continue;

	hb_color_t colors = (hb_color_t) calloc (num_colors, sizeof (hb_color_t));
	hb_ot_color_palette_get_colors (face, palette, 0, &num_colors, colors);
	if (num_colors)
	{
	char output_path[255];
	sprintf (output_path, "out/colr-%u-%u-%u.svg", gid, palette, face_index);

	cairo_surface_t *surface = cairo_svg_surface_create (output_path, extents.width, extents.height);
	cairo_t *cr = cairo_create (surface);
	cairo_set_font_face (cr, cairo_face);
	cairo_set_font_size (cr, upem);

	for (unsigned int layer = 0; layer < num_layers; ++layer)
	{
	hb_color_t color = 0x000000FF;
	if (layers[layer].color_index != 0xFFFF)
	color = colors[layers[layer].color_index];
	cairo_set_source_rgba (cr,
	hb_color_get_red (color) / 255.,
	hb_color_get_green (color) / 255.,
	hb_color_get_blue (color) / 255.,
	hb_color_get_alpha (color) / 255.);

	cairo_glyph_t glyph;
	glyph.index = layers[layer].glyph;
	glyph.x = -extents.x_bearing;
	glyph.y = -extents.y_bearing;
	cairo_show_glyphs (cr, &glyph, 1);
	}

	cairo_surface_destroy (surface);
	cairo_destroy (cr);
	}
	free (colors);
	}
	}

	free (layers);
	}
	}

	static void
	dump_glyphs (cairo_font_face_t *cairo_face, unsigned int upem,
	unsigned int num_glyphs, unsigned int face_index)
	{
	for (unsigned int i = 0; i < num_glyphs; ++i)
	{
	cairo_text_extents_t extents;
	cairo_glyph_t glyph = {0};
	glyph.index = i;

	// Measure
	{
	cairo_surface_t *surface = cairo_image_surface_create (CAIRO_FORMAT_ARGB32, 1, 1);
	cairo_t *cr = cairo_create (surface);
	cairo_set_font_face (cr, cairo_face);
	cairo_set_font_size (cr, upem);

	cairo_glyph_extents (cr, &glyph, 1, &extents);
	cairo_surface_destroy (surface);
	cairo_destroy (cr);
	}

	// Add a slight margin
	extents.width += extents.width / 10;
	extents.height += extents.height / 10;
	extents.x_bearing -= extents.width / 20;
	extents.y_bearing -= extents.height / 20;

	// Render
	{
	char output_path[255];
	sprintf (output_path, "out/%u-%u.svg", face_index, i);
	cairo_surface_t *surface = cairo_svg_surface_create (output_path, extents.width, extents.height);
	cairo_t *cr = cairo_create (surface);
	cairo_set_font_face (cr, cairo_face);
	cairo_set_font_size (cr, upem);
	glyph.x = -extents.x_bearing;
	glyph.y = -extents.y_bearing;
	cairo_show_glyphs (cr, &glyph, 1);
	cairo_surface_destroy (surface);
	cairo_destroy (cr);
	}
	}
	}

	int
	main (int argc, char **argv)
	{
	if (argc != 2) {
	fprintf (stderr, "usage: %s font-file.ttf\n"
	"run it like `rm -rf out && mkdir out && %s font-file.ttf`\n",
	argv[0], argv[0]);
	exit (1);
	}


	FILE *font_name_file = fopen ("out/.dumped_font_name", "r");
	if (font_name_file != NULL)
	{
	fprintf (stderr, "Purge or move ./out folder in order to run a new dump\n");
	exit (1);
	}

	font_name_file = fopen ("out/.dumped_font_name", "w");
	if (font_name_file == NULL)
	{
	fprintf (stderr, "./out is not accessible as a folder, create it please\n");
	exit (1);
	}
	fwrite (argv[1], 1, strlen (argv[1]), font_name_file);
	fclose (font_name_file);

	hb_blob_t *blob = hb_blob_create_from_file (argv[1]);
	unsigned int num_faces = hb_face_count (blob);
	if (num_faces == 0)
	{
	fprintf (stderr, "error: The file (%s) was corrupted, empty or not found", argv[1]);
	exit (1);
	}

	for (unsigned int face_index = 0; face_index < hb_face_count (blob); face_index++)
	{
	hb_face_t *face = hb_face_create (blob, face_index);
	hb_font_t *font = hb_font_create (face);

	if (hb_ot_color_has_png (face)) printf ("Dumping png (cbdt/sbix)...\n");
	png_dump (face, face_index);

	if (hb_ot_color_has_svg (face)) printf ("Dumping svg...\n");
	svg_dump (face, face_index);

	cairo_font_face_t *cairo_face;
	{
	FT_Library library;
	FT_Init_FreeType (&library);
	FT_Face ft_face;
	FT_New_Face (library, argv[1], 0, &ft_face);
	cairo_face = cairo_ft_font_face_create_for_ft_face (ft_face, 0);
	}
	if (hb_ot_color_has_layers (face) && hb_ot_color_has_palettes (face))
	printf ("Dumping layered color glyphs...\n");
	layered_glyph_dump (face, cairo_face, face_index);

	unsigned int num_glyphs = hb_face_get_glyph_count (face);
	unsigned int upem = hb_face_get_upem (face);

	// disabled when color font as cairo rendering of NotoColorEmoji is soooo slow
	if (!hb_ot_color_has_layers (face) &&
	!hb_ot_color_has_png (face) &&
	!hb_ot_color_has_svg (face))
	dump_glyphs (cairo_face, upem, num_glyphs, face_index);

	hb_font_destroy (font);
	hb_face_destroy (face);
	}

	hb_blob_destroy (blob);

	return 0;
	}