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Apply a simple box filter on the subpixels

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Magnus Norddahl 2023-12-29 00:10:06 +01:00 committed by Christoph Oelckers
parent 787eb625e5
commit 9675ac978d
1 changed files with 15 additions and 35 deletions
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50
libraries/ZWidget/src/core/canvas.cpp
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@ -80,6 +80,7 @@ public:
int w = (glyph->metrics.minWidth + 3) & ~3;
int h = glyph->metrics.minHeight;
int maxw = w - 1;
int destwidth = (w + 2) / 3;
@ -103,44 +104,23 @@ public:
{
uint8_t* sline = grayscale + y * w;
uint32_t* dline = dest + y * destwidth;
for (int x = 2; x < w; x += 3)
for (int x = 0; x < w; x += 3)
{
uint32_t red = sline[x - 2];
uint32_t green = sline[x - 1];
uint32_t blue = sline[x];
uint32_t values[5] =
{
sline[std::max(x - 1, 0)],
sline[x],
sline[std::min(x + 1, maxw)],
sline[std::min(x + 2, maxw)],
sline[std::min(x + 3, maxw)],
};
uint32_t red = (values[0] + values[1] + values[1] + values[2] + 2) >> 2;
uint32_t green = (values[1] + values[2] + values[2] + values[3] + 2) >> 2;
uint32_t blue = (values[2] + values[3] + values[3] + values[4] + 2) >> 2;
uint32_t alpha = (red | green | blue) ? 255 : 0;
//red = (red + green) / 2;
//green = (red + green + blue) / 3;
//blue = (green + blue) / 2;
dline[x / 3] = (alpha << 24) | (red << 16) | (green << 8) | blue;
}
if (w % 3 == 1)
{
uint32_t red = sline[w - 1];
uint32_t green = 0;
uint32_t blue = 0;
uint32_t alpha = (red | green | blue) ? 255 : 0;
//red = (red + green) / 2;
//green = (red + green + blue) / 3;
//blue = (green + blue) / 2;
dline[(w - 1) / 3] = (alpha << 24) | (red << 16) | (green << 8) | blue;
}
else if (w % 3 == 2)
{
uint32_t red = sline[w - 2];
uint32_t green = sline[w - 1];
uint32_t blue = 0;
uint32_t alpha = (red | green | blue) ? 255 : 0;
//red = (red + green) / 2;
//green = (red + green + blue) / 3;
//blue = (green + blue) / 2;
dline[(w - 1) / 3] = (alpha << 24) | (red << 16) | (green << 8) | blue;
*(dline++) = (alpha << 24) | (red << 16) | (green << 8) | blue;
}
}