LibGfx: Move ScaledFont and new base class VectorFont out of TTF

1 files changed, 49 insertions, 0 deletions

diff --git a/Userland/Libraries/LibGfx/Font/VectorFont.h b/Userland/Libraries/LibGfx/Font/VectorFont.h
new file mode 100644
index 0000000000..4932818f4d
--- /dev/null
+++ b/Userland/Libraries/LibGfx/Font/VectorFont.h
@@ -0,0 +1,49 @@
+/*
+ * Copyright (c) 2022, the SerenityOS developers.
+ *
+ * SPDX-License-Identifier: BSD-2-Clause
+ */
+
+#pragma once
+
+#include <AK/Noncopyable.h>
+#include <AK/RefCounted.h>
+
+namespace Gfx {
+
+struct ScaledFontMetrics {
+    float ascender { 0 };
+    float descender { 0 };
+    float line_gap { 0 };
+
+    int height() const
+    {
+        return ascender - descender;
+    }
+};
+
+struct ScaledGlyphMetrics {
+    int ascender;
+    int descender;
+    int advance_width;
+    int left_side_bearing;
+};
+
+class VectorFont : public RefCounted<VectorFont> {
+public:
+    virtual ~VectorFont() { }
+    virtual ScaledFontMetrics metrics(float x_scale, float y_scale) const = 0;
+    virtual ScaledGlyphMetrics glyph_metrics(u32 glyph_id, float x_scale, float y_scale) const = 0;
+    virtual float glyphs_horizontal_kerning(u32 left_glyph_id, u32 right_glyph_id, float x_scale) const = 0;
+    virtual RefPtr<Gfx::Bitmap> rasterize_glyph(u32 glyph_id, float x_scale, float y_scale) const = 0;
+    virtual u32 glyph_count() const = 0;
+    virtual u16 units_per_em() const = 0;
+    virtual u32 glyph_id_for_code_point(u32 code_point) const = 0;
+    virtual String family() const = 0;
+    virtual String variant() const = 0;
+    virtual u16 weight() const = 0;
+    virtual u8 slope() const = 0;
+    virtual bool is_fixed_width() const = 0;
+};
+
+}