mirror of
https://github.com/RGBCube/serenity
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50d33f79fa
This updates fonts so rather than rastering directly to a bitmap, you
can extract paths for glyphs. This is then used to implement a
Gfx::Path::text("some text", font) API, that if given a vector font
appends the path of the text to your Gfx::Path. This then allows
arbitrary manipulation of the text (rotation, skewing, etc), paving the
way for Word Art in Serenity.
57 lines
1.6 KiB
C++
57 lines
1.6 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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#include <LibGfx/Path.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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float x_height { 0 };
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float 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, float point_width, float point_height) 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 bool append_glyph_path_to(Gfx::Path&, u32 glyph_id, float x_scale, float y_scale) 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 String family() const = 0;
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virtual String variant() const = 0;
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virtual u16 weight() const = 0;
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virtual u16 width() 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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virtual bool has_color_bitmaps() const = 0;
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};
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}
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