blob: ed88ad748754123f8deda08e74e697d52b67ce53 [file] [log] [blame]
#!/usr/bin/env vpython3
#
# [VPYTHON:BEGIN]
# wheel: <
# name: "infra/python/wheels/freetype-py/${vpython_platform}"
# version: "version:2.2.0.chromium.4"
# >
# [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 95 layers, with each smaller font size having half the size of the previous to form a mip
# chain.
# NOTE: don't run this script directly. Run scripts/run_code_generation.py.
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/RobotoMono-Bold.ttf'
font_license = u"""// Font copyright Google:
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License."""
template_out_file_h = u"""// GENERATED FILE - DO NOT EDIT.
// Generated by {script_name} using {font_file}.
//
// Copyright 2022 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 uint32_t kFontMipCount = {font_count};
constexpr uint32_t kFontCharacters = {char_count};
constexpr uint32_t kFontGlyphWidth = {max_font_width};
constexpr uint32_t kFontGlyphHeight = {max_font_height};
constexpr uint32_t kFontMipDataSize[kFontMipCount] = {{{font_mip_data_sizes}}};
constexpr uint32_t kFontMipDataOffset[kFontMipCount] = {{{font_mip_data_offsets}}};
constexpr uint32_t kFontTotalDataSize = {total_font_data_size};
{font_mips}
}} // namespace overlay
}} // namespace gl
"""
template_out_file_cpp = u"""// GENERATED FILE - DO NOT EDIT.
// Generated by {script_name} using images from {font_file}.
//
// Copyright 2022 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.
//
{font_license}
//
// {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 uint8_t kFontData[{total_font_data_size}] = {{
// clang-format off
{all_font_data}
// clang-format on
}};
}} // anonymous namespace
const uint8_t *OverlayState::getFontData() const
{{
return kFontData;
}}
#else
const uint8_t *OverlayState::getFontData() const
{{
return nullptr;
}}
#endif
}} // namespace gl
"""
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 sizes are chosen such that the sizes form a mip chain.
font_defs = [('large', 29), ('small', 14)]
chars = ' !"#$%&\'()*+,-./0123456789:;<=>?' + \
'@ABCDEFGHIJKLMNOPQRSTUVWXYZ[\]^_' + \
'`abcdefghijklmnopqrstuvwxyz{|}~'
char_count = len(chars)
font_glyph_widths = []
font_glyph_heights = []
font_data = ""
font_mips = []
current_font_mip = 0
font_data_sizes = []
font_data_offsets = []
total_font_data_size = 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_glyph_widths.append(glyph_width)
font_glyph_heights.append(glyph_height)
# Make sure the fonts form a mipchain
if current_font_mip > 0:
assert (glyph_width == font_glyph_widths[current_font_mip - 1] // 2)
assert (glyph_height == font_glyph_heights[current_font_mip - 1] // 2)
font_tag = font_name.capitalize()
font_mip = str(current_font_mip)
font_mip_symbol = 'kFontMip' + font_tag
font_data += '// ' + font_tag + '\n'
# Font pixels are packed in 32-bit values.
font_data_size = char_count * glyph_width * glyph_height
font_data_sizes.append(font_data_size)
font_data_offsets.append(total_font_data_size)
total_font_data_size += font_data_size
for charIndex in range(char_count):
char = chars[charIndex]
font_data += "// '" + char + "'\n"
# 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)
# Some glyphs like '#', '&' etc generate 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
assert (offset_x + width <= glyph_width)
assert (offset_y + rows <= glyph_height)
# Write the character bitmap in the font image.
for y in range(glyph_height):
for x in range(glyph_width):
if y < offset_y or y >= offset_y + rows or x < offset_x or x >= offset_x + width:
font_data += ' 0,'
else:
pixel_value = bitmap.buffer[(y - offset_y) * pitch + (x - offset_x)]
if pixel_value == 0:
font_data += ' 0,'
else:
font_data += '0x{:02X},'.format(pixel_value)
font_data += '\n'
font_mips.append('constexpr uint32_t ' + font_mip_symbol + ' = ' + font_mip + ';')
current_font_mip += 1
with open(out_file_h, 'w') as outfile:
outfile.write(
template_out_file_h.format(
script_name=os.path.basename(__file__),
font_file=font_file,
out_file_name=out_file_h,
font_count=len(font_defs),
char_count=char_count,
max_font_width=font_glyph_widths[0],
max_font_height=font_glyph_heights[0],
font_mip_data_sizes=','.join([str(s) for s in font_data_sizes]),
font_mip_data_offsets=','.join([str(s) for s in font_data_offsets]),
total_font_data_size=total_font_data_size,
font_mips='\n'.join(font_mips)))
outfile.close()
with open(out_file_cpp, 'w') as outfile:
outfile.write(
template_out_file_cpp.format(
script_name=os.path.basename(__file__),
font_file=font_file,
font_license=font_license,
out_file_name=out_file_cpp,
total_font_data_size=total_font_data_size,
all_font_data=font_data))
outfile.close()
if __name__ == '__main__':
sys.exit(main())