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86 lines
3 KiB
C++
86 lines
3 KiB
C++
/*
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* Copyright (c) 2023, Aliaksandr Kalenik <kalenik.aliaksandr@gmail.com>
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*
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* SPDX-License-Identifier: BSD-2-Clause
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*/
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#include <AK/QuickSort.h>
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#include <LibAccelGfx/GlyphAtlas.h>
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#include <LibGfx/Painter.h>
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namespace AccelGfx {
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GlyphAtlas& GlyphAtlas::the()
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{
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static OwnPtr<GlyphAtlas> s_the;
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if (!s_the)
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s_the = make<GlyphAtlas>();
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return *s_the;
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}
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void GlyphAtlas::update(HashMap<Gfx::Font const*, HashTable<u32>> const& unique_glyphs)
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{
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auto need_to_rebuild_texture = false;
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HashMap<GlyphsTextureKey, NonnullRefPtr<Gfx::Bitmap>> glyph_bitmaps;
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for (auto const& [font, code_points] : unique_glyphs) {
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for (auto const& code_point : code_points) {
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auto glyph = font->glyph(code_point);
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auto atlas_key = GlyphsTextureKey { font, code_point };
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if (!m_glyphs_texture_map.contains(atlas_key))
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need_to_rebuild_texture = true;
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if (glyph.bitmap()) {
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glyph_bitmaps.set(atlas_key, *glyph.bitmap());
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}
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}
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}
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if (!need_to_rebuild_texture || glyph_bitmaps.is_empty())
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return;
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m_glyphs_texture_map.clear();
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Vector<GlyphsTextureKey> glyphs_sorted_by_height;
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glyphs_sorted_by_height.ensure_capacity(glyph_bitmaps.size());
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for (auto const& [atlas_key, bitmap] : glyph_bitmaps) {
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glyphs_sorted_by_height.append(atlas_key);
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}
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quick_sort(glyphs_sorted_by_height, [&](auto const& a, auto const& b) {
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auto const* bitmap_a = *glyph_bitmaps.get(a);
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auto const* bitmap_b = *glyph_bitmaps.get(b);
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return bitmap_a->height() > bitmap_b->height();
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});
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int current_x = 0;
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int current_y = 0;
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int row_height = 0;
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int const texture_width = 512;
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int const padding = 1;
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for (auto const& glyphs_texture_key : glyphs_sorted_by_height) {
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auto const* bitmap = *glyph_bitmaps.get(glyphs_texture_key);
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if (current_x + bitmap->width() > texture_width) {
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current_x = 0;
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current_y += row_height + padding;
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row_height = 0;
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}
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m_glyphs_texture_map.set(glyphs_texture_key, { current_x, current_y, bitmap->width(), bitmap->height() });
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current_x += bitmap->width() + padding;
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row_height = max(row_height, bitmap->height());
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}
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auto glyphs_texture_bitmap = MUST(Gfx::Bitmap::create(Gfx::BitmapFormat::BGRA8888, { texture_width, current_y + row_height }));
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auto glyphs_texture_painter = Gfx::Painter(*glyphs_texture_bitmap);
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for (auto const& [glyphs_texture_key, glyph_bitmap] : glyph_bitmaps) {
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auto rect = m_glyphs_texture_map.get(glyphs_texture_key).value();
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glyphs_texture_painter.blit({ rect.x(), rect.y() }, glyph_bitmap, glyph_bitmap->rect());
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}
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GL::upload_texture_data(m_texture, *glyphs_texture_bitmap);
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}
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Optional<Gfx::IntRect> GlyphAtlas::get_glyph_rect(Gfx::Font const* font, u32 code_point) const
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{
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auto atlas_key = GlyphsTextureKey { font, code_point };
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return m_glyphs_texture_map.get(atlas_key);
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}
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}
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