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coretext: colored glyph rendering

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This commit is contained in:
Mitchell Hashimoto
2023-06-30 15:57:59 -07:00
parent 286944cd43
commit a74e49833b
2 changed files with 47 additions and 13 deletions
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10
pkg/macos/graphics/context.zig
View File

@ -101,6 +101,16 @@ pub fn Context(comptime T: type) type {
);
}
pub fn setRGBStrokeColor(self: *T, r: f64, g: f64, b: f64, alpha: f64) void {
c.CGContextSetRGBStrokeColor(
@ptrCast(self),
r,
g,
b,
alpha,
);
}
pub fn setTextDrawingMode(self: *T, mode: TextDrawingMode) void {
c.CGContextSetTextDrawingMode(
@ptrCast(self),

44
src/font/face/coretext.zig
View File

@ -151,30 +151,49 @@ pub const Face = struct {
const width = glyph_width + (padding * 2);
const height = glyph_height + (padding * 2);
// Settings that are specific to if we are rendering text or emoji.
const color: struct {
color: bool,
depth: u32,
space: *macos.graphics.ColorSpace,
context_opts: c_uint,
} = if (self.presentation == .text) .{
.color = false,
.depth = 1,
.space = try macos.graphics.ColorSpace.createDeviceGray(),
.context_opts = @intFromEnum(macos.graphics.BitmapInfo.alpha_mask) &
@intFromEnum(macos.graphics.ImageAlphaInfo.none),
} else .{
.color = true,
.depth = 4,
.space = try macos.graphics.ColorSpace.createDeviceRGB(),
.context_opts = @intFromEnum(macos.graphics.BitmapInfo.byte_order_32_little) |
@intFromEnum(macos.graphics.ImageAlphaInfo.premultiplied_first),
};
defer color.space.release();
// Our buffer for rendering
// TODO(perf): cache this buffer
// TODO(mitchellh): color is going to require a depth here
var buf = try alloc.alloc(u8, width * height);
var buf = try alloc.alloc(u8, width * height * color.depth);
defer alloc.free(buf);
@memset(buf, 0);
const space = try macos.graphics.ColorSpace.createDeviceGray();
defer space.release();
const ctx = try macos.graphics.BitmapContext.create(
buf,
width,
height,
8,
width,
space,
@intFromEnum(macos.graphics.BitmapInfo.alpha_mask) &
@intFromEnum(macos.graphics.ImageAlphaInfo.none),
width * color.depth,
color.space,
color.context_opts,
);
defer ctx.release();
// Perform an initial fill. This ensures that we don't have any
// uninitialized pixels in the bitmap.
if (color.color)
ctx.setRGBFillColor(1, 1, 1, 0)
else
ctx.setGrayFillColor(0, 0);
ctx.fillRect(.{
.origin = .{ .x = 0, .y = 0 },
@ -185,7 +204,7 @@ pub const Face = struct {
});
ctx.setAllowsFontSmoothing(true);
ctx.setShouldSmoothFonts(true);
ctx.setShouldSmoothFonts(true); // The amadeus "enthicken"
ctx.setAllowsFontSubpixelQuantization(true);
ctx.setShouldSubpixelQuantizeFonts(true);
ctx.setAllowsFontSubpixelPositioning(true);
@ -194,8 +213,13 @@ pub const Face = struct {
ctx.setShouldAntialias(true);
// Set our color for drawing
if (color.color) {
ctx.setRGBFillColor(1, 1, 1, 1);
ctx.setRGBStrokeColor(1, 1, 1, 1);
} else {
ctx.setGrayFillColor(1, 1);
ctx.setGrayStrokeColor(1, 1);
}
// We want to render the glyphs at (0,0), but the glyphs themselves
// are offset by bearings, so we have to undo those bearings in order