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b70394170c
This patch adds support for rendering italic fonts and bold fonts. The `font` crate has a couple of new paradigms to support this: font keys and glyph keys. `FontKey` is a lightweight (4 byte) identifier for a font loaded out of the rasterizer. This replaces `FontDesc` for rasterizing glyphs from a loaded font. `FontDesc` had the problem that it contained two strings, and the glyph cache needs to store a copy of the font key for every loaded glyph. `GlyphKey` is now passed to the glyph rasterization method instead of a simple `char`. `GlyphKey` contains information including font, size, and the character. The rasterizer APIs do not define what happens when loading the same font from a `FontDesc` more than once. It is assumed that the application will track the resulting `FontKey` instead of asking the font to be loaded multiple times. |
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