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LibAccelGfx: Introduce glyph run painting support

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Text painting operates in two steps:

1. Preparation of a texture that contains all the glyphs required for
   text painting, along with metadata that describes the locations of
   those glyphs within texture beforehand.
2. Blitting glyphs from the prepared texture onto corresponding glyph
   quads.

Users of LibAccelGfx will need to call `prepare_glyphs_texture()`,
passing a set of all unique (font, code_paint) pairs, before painting
any text.
This commit is contained in:
Aliaksandr Kalenik 2023-11-05 00:25:12 +01:00 • committed by Andreas Kling
parent efdbd8238e
commit 32ea11d45c
2 changed files with 196 additions and 11 deletions
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34
Userland/Libraries/LibAccelGfx/Painter.h
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@ -1,18 +1,22 @@
/*
* Copyright (c) 2023, Andreas Kling <kling@serenityos.org>
* 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 <AK/Vector.h>
#include <LibAccelGfx/Canvas.h>
#include <LibAccelGfx/Forward.h>
#include <LibAccelGfx/Program.h>
#include <LibGfx/AffineTransform.h>
#include <LibGfx/Font/Font.h>
#include <LibGfx/Forward.h>
#include <LibGfx/TextLayout.h>
namespace AccelGfx {
@ -45,6 +49,20 @@ public:
void draw_scaled_bitmap(Gfx::FloatRect const& dst_rect, Gfx::Bitmap const&, Gfx::FloatRect const& src_rect, ScalingMode = ScalingMode::NearestNeighbor);
void draw_scaled_bitmap(Gfx::IntRect const& dst_rect, Gfx::Bitmap const&, Gfx::IntRect const& src_rect, ScalingMode = ScalingMode::NearestNeighbor);
void prepare_glyph_texture(HashMap<Gfx::Font const*, HashTable<u32>> const& unique_glyphs);
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 draw_glyph_run(Vector<Gfx::DrawGlyphOrEmoji> const& glyph_run, Color const& color);
void set_canvas(Canvas& canvas) { m_canvas = canvas; }
void flush();
@ -65,6 +83,22 @@ private:
Program m_rectangle_program;
Program m_blit_program;
HashMap<GlyphsTextureKey, Gfx::IntRect> m_glyphs_texture_map;
Gfx::IntSize m_glyphs_texture_size;
GLuint m_glyphs_texture;
};
}
namespace AK {
template<>
struct Traits<AccelGfx::Painter::GlyphsTextureKey> : public GenericTraits<AccelGfx::Painter::GlyphsTextureKey> {
static unsigned hash(AccelGfx::Painter::GlyphsTextureKey const& key)
{
return pair_int_hash(ptr_hash(key.font), key.code_point);
}
};
}