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LibAccelGfx+LibWeb: Move glyph atlas into a singleton class

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This is going to allow us reuse glyph texture across painters and page
repaints.
This commit is contained in:
Aliaksandr Kalenik 2023-11-26 15:22:06 +01:00 • committed by Andreas Kling
parent 4b23046a22
commit 28723d8be1
6 changed files with 157 additions and 105 deletions
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81
Userland/Libraries/LibAccelGfx/GlyphAtlas.cpp Normal file
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/*
* Copyright (c) 2023, Aliaksandr Kalenik <kalenik.aliaksandr@gmail.com>
*
* SPDX-License-Identifier: BSD-2-Clause
*/
#include <AK/QuickSort.h>
#include <LibAccelGfx/GlyphAtlas.h>
#include <LibGfx/Painter.h>
namespace AccelGfx {
GlyphAtlas& GlyphAtlas::the()
{
static OwnPtr<GlyphAtlas> s_the;
if (!s_the)
s_the = make<GlyphAtlas>();
return *s_the;
}
void GlyphAtlas::update(HashMap<Gfx::Font const*, HashTable<u32>> const& unique_glyphs)
{
HashMap<GlyphsTextureKey, NonnullRefPtr<Gfx::Bitmap>> glyph_bitmaps;
for (auto const& [font, code_points] : unique_glyphs) {
for (auto const& code_point : code_points) {
auto glyph = font->glyph(code_point);
if (glyph.bitmap()) {
auto atlas_key = GlyphsTextureKey { font, code_point };
glyph_bitmaps.set(atlas_key, *glyph.bitmap());
}
}
}
if (glyph_bitmaps.is_empty())
return;
Vector<GlyphsTextureKey> glyphs_sorted_by_height;
glyphs_sorted_by_height.ensure_capacity(glyph_bitmaps.size());
for (auto const& [atlas_key, bitmap] : glyph_bitmaps) {
glyphs_sorted_by_height.append(atlas_key);
}
quick_sort(glyphs_sorted_by_height, [&](auto const& a, auto const& b) {
auto const& bitmap_a = *glyph_bitmaps.get(a);
auto const& bitmap_b = *glyph_bitmaps.get(b);
return bitmap_a->height() > bitmap_b->height();
});
int current_x = 0;
int current_y = 0;
int row_height = 0;
int const texture_width = 512;
int const padding = 1;
for (auto const& glyphs_texture_key : glyphs_sorted_by_height) {
auto const& bitmap = *glyph_bitmaps.get(glyphs_texture_key);
if (current_x + bitmap->width() > texture_width) {
current_x = 0;
current_y += row_height + padding;
row_height = 0;
}
m_glyphs_texture_map.set(glyphs_texture_key, { current_x, current_y, bitmap->width(), bitmap->height() });
current_x += bitmap->width() + padding;
row_height = max(row_height, bitmap->height());
}
auto glyphs_texture_bitmap = MUST(Gfx::Bitmap::create(Gfx::BitmapFormat::BGRA8888, { texture_width, current_y + row_height }));
auto glyphs_texture_painter = Gfx::Painter(*glyphs_texture_bitmap);
for (auto const& [glyphs_texture_key, glyph_bitmap] : glyph_bitmaps) {
auto rect = m_glyphs_texture_map.get(glyphs_texture_key).value();
glyphs_texture_painter.blit({ rect.x(), rect.y() }, glyph_bitmap, glyph_bitmap->rect());
}
GL::upload_texture_data(m_texture, *glyphs_texture_bitmap);
}
Optional<Gfx::IntRect> GlyphAtlas::get_glyph_rect(Gfx::Font const* font, u32 code_point) const
{
auto atlas_key = GlyphsTextureKey { font, code_point };
return m_glyphs_texture_map.get(atlas_key);
}
}