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ada48a1daf
This adds the option to pass a subpixel offset when fetching a glyph from a font, this offset is currently snapped to thirds of a pixel (i.e. 0, 0.33, 0.66). This is then used when rasterizing the glyph, which is then cached like usual. Note that when using subpixel offsets you're trading a bit of space for accuracy. With the current third of a pixel offsets you can end up with up to 9 bitmaps per glyph.
51 lines
1.4 KiB
C++
51 lines
1.4 KiB
C++
/*
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* Copyright (c) 2022, the SerenityOS developers.
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*
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* SPDX-License-Identifier: BSD-2-Clause
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*/
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#pragma once
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#include <AK/Noncopyable.h>
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#include <AK/RefCounted.h>
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#include <LibGfx/Font/Font.h>
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#include <LibGfx/Forward.h>
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namespace Gfx {
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struct ScaledFontMetrics {
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float ascender { 0 };
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float descender { 0 };
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float line_gap { 0 };
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int height() const
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{
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return ascender - descender;
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}
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};
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struct ScaledGlyphMetrics {
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float ascender;
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float descender;
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float advance_width;
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float left_side_bearing;
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};
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class VectorFont : public RefCounted<VectorFont> {
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public:
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virtual ~VectorFont() { }
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virtual ScaledFontMetrics metrics(float x_scale, float y_scale) const = 0;
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virtual ScaledGlyphMetrics glyph_metrics(u32 glyph_id, float x_scale, float y_scale) const = 0;
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virtual float glyphs_horizontal_kerning(u32 left_glyph_id, u32 right_glyph_id, float x_scale) const = 0;
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virtual RefPtr<Gfx::Bitmap> rasterize_glyph(u32 glyph_id, float x_scale, float y_scale, GlyphSubpixelOffset) const = 0;
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virtual u32 glyph_count() const = 0;
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virtual u16 units_per_em() const = 0;
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virtual u32 glyph_id_for_code_point(u32 code_point) const = 0;
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virtual DeprecatedString family() const = 0;
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virtual DeprecatedString variant() const = 0;
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virtual u16 weight() const = 0;
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virtual u8 slope() const = 0;
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virtual bool is_fixed_width() const = 0;
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};
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}
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