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font: set alpha to 0xff in rasterizer

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Since fonts now use dual source blending, the pixel colors are
interpreted as individual alpha channels.  The A component should
be set to 1.0, so that's what we do here.

refs: #1025
This commit is contained in:
Wez Furlong 2021-09-04 18:54:32 -07:00
parent 311bd78902
commit 18ddf38174
1 changed files with 2 additions and 4 deletions
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6
wezterm-font/src/rasterizer/freetype.rs
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@ -124,7 +124,6 @@ impl FreeTypeRasterizer {
let dest_offset = y * width * 4;
for x in 0..width {
let linear_gray = data[src_offset + x];
let gray = linear_u8_to_srgb8(linear_gray);
// Texture is SRGBA, which in OpenGL means
@ -135,7 +134,7 @@ impl FreeTypeRasterizer {
rgba[dest_offset + (x * 4)] = gray;
rgba[dest_offset + (x * 4) + 1] = gray;
rgba[dest_offset + (x * 4) + 2] = gray;
rgba[dest_offset + (x * 4) + 3] = linear_gray;
rgba[dest_offset + (x * 4) + 3] = 0xff;
}
}
RasterizedGlyph {
@ -165,7 +164,6 @@ impl FreeTypeRasterizer {
let red = data[src_offset + (x * 3)];
let green = data[src_offset + (x * 3) + 1];
let blue = data[src_offset + (x * 3) + 2];
let alpha = red.max(green).max(blue);
// Texture is SRGBA, which in OpenGL means
// that the RGB values are gamma adjusted
@ -179,7 +177,7 @@ impl FreeTypeRasterizer {
rgba[dest_offset + (x * 4)] = red;
rgba[dest_offset + (x * 4) + 1] = green;
rgba[dest_offset + (x * 4) + 2] = blue;
rgba[dest_offset + (x * 4) + 3] = alpha;
rgba[dest_offset + (x * 4) + 3] = 0xff;
}
}