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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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64
Userland/Libraries/LibAccelGfx/GlyphAtlas.h Normal file
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/*
* Copyright (c) 2023, Aliaksandr Kalenik <kalenik.aliaksandr@gmail.com>
*
* SPDX-License-Identifier: BSD-2-Clause
*/
#pragma once
#include <AK/HashMap.h>
#include <AK/Noncopyable.h>
#include <LibAccelGfx/GL.h>
#include <LibGfx/Font/Font.h>
namespace AccelGfx {
class GlyphAtlas {
AK_MAKE_NONCOPYABLE(GlyphAtlas);
public:
GlyphAtlas()
: m_texture(GL::create_texture())
{
}
~GlyphAtlas()
{
GL::delete_texture(m_texture);
}
static GlyphAtlas& the();
struct GlyphsTextureKey {
Gfx::Font const* font;
u32 code_point;
bool operator==(GlyphsTextureKey const& other) const
{
return font == other.font && code_point == other.code_point;
}
};
void update(HashMap<Gfx::Font const*, HashTable<u32>> const& unique_glyphs);
Optional<Gfx::IntRect> get_glyph_rect(Gfx::Font const*, u32 code_point) const;
GL::Texture const& texture() const { return m_texture; }
private:
GL::Texture m_texture;
HashMap<GlyphsTextureKey, Gfx::IntRect> m_glyphs_texture_map;
};
}
namespace AK {
template<>
struct Traits<AccelGfx::GlyphAtlas::GlyphsTextureKey> : public DefaultTraits<AccelGfx::GlyphAtlas::GlyphsTextureKey> {
static unsigned hash(AccelGfx::GlyphAtlas::GlyphsTextureKey const& key)
{
return pair_int_hash(ptr_hash(key.font), key.code_point);
}
};
}