third_party/angle/src/libANGLE/gen_overlay_fonts.py - cobalt - Git at Google

 #!/usr/bin/env vpython
 #
 # [VPYTHON:BEGIN]
 # wheel: <
 #   name: "infra/python/wheels/freetype-py/${vpython_platform}"
 #   version: "version:2.1.0.post1"
 # >
 # [VPYTHON:END]

 # Copyright 2019 The ANGLE Project Authors. All rights reserved.
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 #
 # gen_vk_overlay_fonts.py:
 #  Code generation for overlay fonts.  Should be run if the font file under overlay/ is changed,
 #  or the font sizes declared in this file are modified.  The font is assumed to be monospace.
 #  The output will contain ASCII characters in order from ' ' to '~'.  The output will be images
 #  with 3 rows of 32 characters each.
 #  NOTE: don't run this script directly. Run scripts/run_code_generation.py.

 from datetime import date
 import sys

 if len(sys.argv) < 2:
     from freetype import *

 out_file_cpp = 'Overlay_font_autogen.cpp'
 out_file_h = 'Overlay_font_autogen.h'
 font_file = 'overlay/DejaVuSansMono-Bold.ttf'

 template_out_file_h = u"""// GENERATED FILE - DO NOT EDIT.
 // Generated by {script_name} using {font_file}.
 //
 // Copyright {copyright_year} The ANGLE Project Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 //
 // {out_file_name}:
 //   Autogenerated overlay font data.

 #include "libANGLE/Overlay.h"

 namespace gl
 {{
 namespace overlay
 {{
 constexpr int kFontCount = {font_count};
 constexpr int kFontGlyphWidths[kFontCount] = {{ {font_glyph_widths} }};
 constexpr int kFontGlyphHeights[kFontCount] = {{ {font_glyph_heights} }};
 constexpr int kFontCharactersPerRow = 32;
 constexpr int kFontCharactersPerCol = 3;
 constexpr int kFontCharacters = kFontCharactersPerRow * kFontCharactersPerCol;
 constexpr int kFontImageWidth = {max_font_width} * kFontCharactersPerRow;
 constexpr int kFontImageHeight = {max_font_height} * kFontCharactersPerCol;
 {font_layers}
 }}  // namespace overlay
 }}  // namespace gl

 """

 template_out_file_cpp = u"""// GENERATED FILE - DO NOT EDIT.
 // Generated by {script_name} using images from {font_file}.
 //
 // Copyright {copyright_year} The ANGLE Project Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 //
 // {out_file_name}:
 //   Autogenerated overlay font data.

 #include "libANGLE/Overlay.h"
 #include "libANGLE/Overlay_font_autogen.h"

 #include <numeric>

 namespace gl
 {{
 using namespace overlay;

 // Save binary size if the font images are never to be used.
 #if ANGLE_ENABLE_OVERLAY
 namespace
 {{
 constexpr int kFontWidths[kFontCount] = {{ {font_layer_widths} }};
 constexpr int kFontHeights[kFontCount] = {{ {font_layer_heights} }};

 {font_data}

 // Returns a bit with the value of the pixel.
 template<int kFontWidth, int kFontHeight>
 uint32_t GetFontLayerPixel(const uint32_t fontImage[kFontHeight][kFontWidth / 32], int x, int y)
 {{
     ASSERT(x >= 0 && x < kFontWidth && y >= 0 && y < kFontHeight);
     return fontImage[y][x / 32] >> (x % 32) & 1;
 }}

 inline uint32_t GetFontPixel(int layer, int x, int y)
 {{
     switch (layer)
     {{
     {get_font_layer_pixel}
     default:
         UNREACHABLE();
         return 0;
     }}
 }}

 }}  // anonymous namespace

 void OverlayState::initFontData(uint8_t *fontData) const
 {{
     constexpr int kFontDataLayerSize = kFontImageWidth * kFontImageHeight;

     // Unpack the font bitmap into R8_UNORM format.  Border pixels are given a 0.5 value for better
     // font visibility.
     for (int layer = 0; layer < kFontCount; ++layer)
     {{
         memset(fontData, 0, kFontDataLayerSize);
         for (int y = 0; y < kFontHeights[layer]; ++y)
         {{
             for (int x = 0; x < kFontWidths[layer]; ++x)
             {{
                 uint32_t src     = GetFontPixel(layer, x, y);
                 uint8_t dstValue = src ? 255 : 0;
                 fontData[y * kFontImageWidth + x] = dstValue;
             }}
         }}
         fontData += kFontDataLayerSize;
     }}
 }}
 #else
 void OverlayState::initFontData(uint8_t *fontData) const
 {{
     memset(fontData, 0, kFontCount * kFontImageWidth * kFontImageHeight * sizeof(*fontData));
 }}
 #endif
 }}  // namespace gl
 """

 template_get_font_layer_pixel = u"""case {layer}:
     return GetFontLayerPixel<kFontWidths[{layer}], kFontHeights[{layer}]>({font_image}, x, y);
 """


 def main():
     if len(sys.argv) == 2 and sys.argv[1] == 'inputs':
         # disabled because of issues on Windows. http://anglebug.com/3892
         # print(font_file)
         return
     if len(sys.argv) == 2 and sys.argv[1] == 'outputs':
         print(','.join([out_file_cpp, out_file_h]))
         return

     font_defs = [('large', 36), ('medium', 23), ('small', 14)]
     chars = ' !"#$%&\'()*+,-./0123456789:;<=>?' + \
             '@ABCDEFGHIJKLMNOPQRSTUVWXYZ[\]^_' + \
             '`abcdefghijklmnopqrstuvwxyz{|}~ '
     output_rows = 3
     output_cols = 32
     assert (len(chars) == output_rows * output_cols)

     font_glyph_widths = []
     font_glyph_heights = []
     font_layers = []
     font_data = []
     get_font_layer_pixel = []
     current_font_layer = 0

     # Load the font file.
     face = Face(font_file)
     assert (face.is_fixed_width)

     for font_name, font_size in font_defs:

         # Since the font is fixed width, we can retrieve its size right away.
         face.set_char_size(font_size << 6)
         glyph_width = face.size.max_advance >> 6
         glyph_ascender = face.size.ascender >> 6
         glyph_descender = face.size.descender >> 6
         glyph_height = glyph_ascender - glyph_descender

         font_tag = font_name.capitalize()
         font_layer = str(current_font_layer)
         font_layer_symbol = 'kFontLayer' + font_tag
         font_array_name = 'kFontImage' + font_tag
         font_width = 'kFontWidths[' + font_layer_symbol + ']'
         font_height = 'kFontHeights[' + font_layer_symbol + ']'

         # Font pixels are packed in 32-bit values.
         font_array_width = output_cols * glyph_width / 32
         font_array_height = output_rows * glyph_height
         font_array = [[0] * font_array_width for i in range(font_array_height)]

         for charIndex in range(len(chars)):
             char = chars[charIndex]
             base_x = (charIndex % output_cols) * glyph_width
             base_y = (charIndex / output_cols) * glyph_height

             # Render the character.
             face.load_char(char)
             bitmap = face.glyph.bitmap
             left = face.glyph.bitmap_left
             top = face.glyph.bitmap_top
             width = bitmap.width
             rows = bitmap.rows
             pitch = bitmap.pitch

             offset_x = left
             offset_y = glyph_height - (top - glyph_descender)

             # '#' in the smallest font generates a larger glyph than the "fixed" font width.
             if offset_x + width > glyph_width:
                 offset_x = glyph_width - width
                 if offset_x < 0:
                     width += offset_x
                     offset_x = 0

             base_x += offset_x
             base_y += offset_y

             assert (offset_x + width <= glyph_width)
             assert (offset_y + rows <= glyph_height)

             # Write the character bitmap in the font image.
             for y in range(rows):
                 for x in range(width):
                     pixel_value = bitmap.buffer[y * pitch + x]
                     output_bit = 1 if pixel_value >= 122 else 0

                     font_array_row = base_y + y
                     font_array_col = (base_x + x) / 32
                     font_array_bit = (base_x + x) % 32
                     font_array[font_array_row][font_array_col] |= output_bit << font_array_bit

         # Output the image to a C array.
         data = 'constexpr uint32_t ' + font_array_name + '[' + font_height + '][' + font_width + '/32] = {\n'
         for y in range(font_array_height):
             data += '{'
             for x in range(font_array_width):
                 data += '0x{:08X}, '.format(font_array[y][x])
             data += '},\n'
         data += '};\n'

         font_glyph_widths.append(glyph_width)
         font_glyph_heights.append(glyph_height)
         font_layers.append('constexpr int ' + font_layer_symbol + ' = ' + font_layer + ';')
         font_data.append(data)
         get_font_layer_pixel.append(
             template_get_font_layer_pixel.format(
                 layer=font_layer_symbol, font_image=font_array_name))
         current_font_layer += 1

     with open(out_file_h, 'w') as outfile:
         outfile.write(
             template_out_file_h.format(
                 script_name=__file__,
                 font_file=font_file,
                 copyright_year=date.today().year,
                 out_file_name=out_file_h,
                 font_count=len(font_data),
                 font_glyph_widths=','.join(map(str, font_glyph_widths)),
                 font_glyph_heights=','.join(map(str, font_glyph_heights)),
                 max_font_width=max(font_glyph_widths),
                 max_font_height=max(font_glyph_heights),
                 font_layers='\n'.join(font_layers)))
         outfile.close()

     font_layer_widths = [
         'kFontGlyphWidths[' + str(layer) + '] * kFontCharactersPerRow'
         for layer in range(len(font_data))
     ]
     font_layer_heights = [
         'kFontGlyphHeights[' + str(layer) + '] * kFontCharactersPerCol'
         for layer in range(len(font_data))
     ]

     with open(out_file_cpp, 'w') as outfile:
         outfile.write(
             template_out_file_cpp.format(
                 script_name=__file__,
                 font_file=font_file,
                 copyright_year=date.today().year,
                 out_file_name=out_file_cpp,
                 font_layer_widths=','.join(font_layer_widths),
                 font_layer_heights=','.join(font_layer_heights),
                 font_data='\n'.join(font_data),
                 get_font_layer_pixel=''.join(get_font_layer_pixel)))
         outfile.close()


 if __name__ == '__main__':
     sys.exit(main())
	#!/usr/bin/env vpython
	#
	# [VPYTHON:BEGIN]
	# wheel: <
	# name: "infra/python/wheels/freetype-py/${vpython_platform}"
	# version: "version:2.1.0.post1"
	# >
	# [VPYTHON:END]

	# Copyright 2019 The ANGLE Project Authors. All rights reserved.
	# Use of this source code is governed by a BSD-style license that can be
	# found in the LICENSE file.
	#
	# gen_vk_overlay_fonts.py:
	# Code generation for overlay fonts. Should be run if the font file under overlay/ is changed,
	# or the font sizes declared in this file are modified. The font is assumed to be monospace.
	# The output will contain ASCII characters in order from ' ' to '~'. The output will be images
	# with 3 rows of 32 characters each.
	# NOTE: don't run this script directly. Run scripts/run_code_generation.py.

	from datetime import date
	import sys

	if len(sys.argv) < 2:
	from freetype import *

	out_file_cpp = 'Overlay_font_autogen.cpp'
	out_file_h = 'Overlay_font_autogen.h'
	font_file = 'overlay/DejaVuSansMono-Bold.ttf'

	template_out_file_h = u"""// GENERATED FILE - DO NOT EDIT.
	// Generated by {script_name} using {font_file}.
	//
	// Copyright {copyright_year} The ANGLE Project Authors. All rights reserved.
	// Use of this source code is governed by a BSD-style license that can be
	// found in the LICENSE file.
	//
	// {out_file_name}:
	// Autogenerated overlay font data.

	#include "libANGLE/Overlay.h"

	namespace gl
	{{
	namespace overlay
	{{
	constexpr int kFontCount = {font_count};
	constexpr int kFontGlyphWidths[kFontCount] = {{ {font_glyph_widths} }};
	constexpr int kFontGlyphHeights[kFontCount] = {{ {font_glyph_heights} }};
	constexpr int kFontCharactersPerRow = 32;
	constexpr int kFontCharactersPerCol = 3;
	constexpr int kFontCharacters = kFontCharactersPerRow * kFontCharactersPerCol;
	constexpr int kFontImageWidth = {max_font_width} * kFontCharactersPerRow;
	constexpr int kFontImageHeight = {max_font_height} * kFontCharactersPerCol;
	{font_layers}
	}} // namespace overlay
	}} // namespace gl

	"""

	template_out_file_cpp = u"""// GENERATED FILE - DO NOT EDIT.
	// Generated by {script_name} using images from {font_file}.
	//
	// Copyright {copyright_year} The ANGLE Project Authors. All rights reserved.
	// Use of this source code is governed by a BSD-style license that can be
	// found in the LICENSE file.
	//
	// {out_file_name}:
	// Autogenerated overlay font data.

	#include "libANGLE/Overlay.h"
	#include "libANGLE/Overlay_font_autogen.h"

	#include <numeric>

	namespace gl
	{{
	using namespace overlay;

	// Save binary size if the font images are never to be used.
	#if ANGLE_ENABLE_OVERLAY
	namespace
	{{
	constexpr int kFontWidths[kFontCount] = {{ {font_layer_widths} }};
	constexpr int kFontHeights[kFontCount] = {{ {font_layer_heights} }};

	{font_data}

	// Returns a bit with the value of the pixel.
	template<int kFontWidth, int kFontHeight>
	uint32_t GetFontLayerPixel(const uint32_t fontImage[kFontHeight][kFontWidth / 32], int x, int y)
	{{
	ASSERT(x >= 0 && x < kFontWidth && y >= 0 && y < kFontHeight);
	return fontImage[y][x / 32] >> (x % 32) & 1;
	}}

	inline uint32_t GetFontPixel(int layer, int x, int y)
	{{
	switch (layer)
	{{
	{get_font_layer_pixel}
	default:
	UNREACHABLE();
	return 0;
	}}
	}}

	}} // anonymous namespace

	void OverlayState::initFontData(uint8_t *fontData) const
	{{
	constexpr int kFontDataLayerSize = kFontImageWidth * kFontImageHeight;

	// Unpack the font bitmap into R8_UNORM format. Border pixels are given a 0.5 value for better
	// font visibility.
	for (int layer = 0; layer < kFontCount; ++layer)
	{{
	memset(fontData, 0, kFontDataLayerSize);
	for (int y = 0; y < kFontHeights[layer]; ++y)
	{{
	for (int x = 0; x < kFontWidths[layer]; ++x)
	{{
	uint32_t src = GetFontPixel(layer, x, y);
	uint8_t dstValue = src ? 255 : 0;
	fontData[y * kFontImageWidth + x] = dstValue;
	}}
	}}
	fontData += kFontDataLayerSize;
	}}
	}}
	#else
	void OverlayState::initFontData(uint8_t *fontData) const
	{{
	memset(fontData, 0, kFontCount * kFontImageWidth * kFontImageHeight * sizeof(*fontData));
	}}
	#endif
	}} // namespace gl
	"""

	template_get_font_layer_pixel = u"""case {layer}:
	return GetFontLayerPixel<kFontWidths[{layer}], kFontHeights[{layer}]>({font_image}, x, y);
	"""


	def main():
	if len(sys.argv) == 2 and sys.argv[1] == 'inputs':
	# disabled because of issues on Windows. http://anglebug.com/3892
	# print(font_file)
	return
	if len(sys.argv) == 2 and sys.argv[1] == 'outputs':
	print(','.join([out_file_cpp, out_file_h]))
	return

	font_defs = [('large', 36), ('medium', 23), ('small', 14)]
	chars = ' !"#$%&\'()*+,-./0123456789:;<=>?' + \
	'@ABCDEFGHIJKLMNOPQRSTUVWXYZ[\]^_' + \
	'`abcdefghijklmnopqrstuvwxyz{\|}~ '
	output_rows = 3
	output_cols = 32
	assert (len(chars) == output_rows * output_cols)

	font_glyph_widths = []
	font_glyph_heights = []
	font_layers = []
	font_data = []
	get_font_layer_pixel = []
	current_font_layer = 0

	# Load the font file.
	face = Face(font_file)
	assert (face.is_fixed_width)

	for font_name, font_size in font_defs:

	# Since the font is fixed width, we can retrieve its size right away.
	face.set_char_size(font_size << 6)
	glyph_width = face.size.max_advance >> 6
	glyph_ascender = face.size.ascender >> 6
	glyph_descender = face.size.descender >> 6
	glyph_height = glyph_ascender - glyph_descender

	font_tag = font_name.capitalize()
	font_layer = str(current_font_layer)
	font_layer_symbol = 'kFontLayer' + font_tag
	font_array_name = 'kFontImage' + font_tag
	font_width = 'kFontWidths[' + font_layer_symbol + ']'
	font_height = 'kFontHeights[' + font_layer_symbol + ']'

	# Font pixels are packed in 32-bit values.
	font_array_width = output_cols * glyph_width / 32
	font_array_height = output_rows * glyph_height
	font_array = [[0] * font_array_width for i in range(font_array_height)]

	for charIndex in range(len(chars)):
	char = chars[charIndex]
	base_x = (charIndex % output_cols) * glyph_width
	base_y = (charIndex / output_cols) * glyph_height

	# Render the character.
	face.load_char(char)
	bitmap = face.glyph.bitmap
	left = face.glyph.bitmap_left
	top = face.glyph.bitmap_top
	width = bitmap.width
	rows = bitmap.rows
	pitch = bitmap.pitch

	offset_x = left
	offset_y = glyph_height - (top - glyph_descender)

	# '#' in the smallest font generates a larger glyph than the "fixed" font width.
	if offset_x + width > glyph_width:
	offset_x = glyph_width - width
	if offset_x < 0:
	width += offset_x
	offset_x = 0

	base_x += offset_x
	base_y += offset_y

	assert (offset_x + width <= glyph_width)
	assert (offset_y + rows <= glyph_height)

	# Write the character bitmap in the font image.
	for y in range(rows):
	for x in range(width):
	pixel_value = bitmap.buffer[y * pitch + x]
	output_bit = 1 if pixel_value >= 122 else 0

	font_array_row = base_y + y
	font_array_col = (base_x + x) / 32
	font_array_bit = (base_x + x) % 32
	font_array[font_array_row][font_array_col] \|= output_bit << font_array_bit

	# Output the image to a C array.
	data = 'constexpr uint32_t ' + font_array_name + '[' + font_height + '][' + font_width + '/32] = {\n'
	for y in range(font_array_height):
	data += '{'
	for x in range(font_array_width):
	data += '0x{:08X}, '.format(font_array[y][x])
	data += '},\n'
	data += '};\n'

	font_glyph_widths.append(glyph_width)
	font_glyph_heights.append(glyph_height)
	font_layers.append('constexpr int ' + font_layer_symbol + ' = ' + font_layer + ';')
	font_data.append(data)
	get_font_layer_pixel.append(
	template_get_font_layer_pixel.format(
	layer=font_layer_symbol, font_image=font_array_name))
	current_font_layer += 1

	with open(out_file_h, 'w') as outfile:
	outfile.write(
	template_out_file_h.format(
	script_name=__file__,
	font_file=font_file,
	copyright_year=date.today().year,
	out_file_name=out_file_h,
	font_count=len(font_data),
	font_glyph_widths=','.join(map(str, font_glyph_widths)),
	font_glyph_heights=','.join(map(str, font_glyph_heights)),
	max_font_width=max(font_glyph_widths),
	max_font_height=max(font_glyph_heights),
	font_layers='\n'.join(font_layers)))
	outfile.close()

	font_layer_widths = [
	'kFontGlyphWidths[' + str(layer) + '] * kFontCharactersPerRow'
	for layer in range(len(font_data))
	]
	font_layer_heights = [
	'kFontGlyphHeights[' + str(layer) + '] * kFontCharactersPerCol'
	for layer in range(len(font_data))
	]

	with open(out_file_cpp, 'w') as outfile:
	outfile.write(
	template_out_file_cpp.format(
	script_name=__file__,
	font_file=font_file,
	copyright_year=date.today().year,
	out_file_name=out_file_cpp,
	font_layer_widths=','.join(font_layer_widths),
	font_layer_heights=','.join(font_layer_heights),
	font_data='\n'.join(font_data),
	get_font_layer_pixel=''.join(get_font_layer_pixel)))
	outfile.close()


	if __name__ == '__main__':
	sys.exit(main())