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Fix alpha blending - sent - simple plaintext presentation tool |
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git clone git://git.suckless.org/sent |
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--- |
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commit 68ac6486b106751f79e2ff2f4d53e56843521ce5 |
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parent b0ad67036e35bc148ebda08184881375e716ec0b |
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Author: FRIGN <[email protected]> |
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Date: Sun, 31 Jan 2016 11:05:00 +0100 |
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Fix alpha blending |
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- "/ 257", because 255 * 257 = UINT16_MAX |
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- "/ 255", because that's the maximum possible RGB value |
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Diffstat: |
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M sent.c | 14 +++++++------- |
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1 file changed, 7 insertions(+), 7 deletions(-) |
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--- |
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diff --git a/sent.c b/sent.c |
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@@ -258,15 +258,15 @@ int ffread(Image *img) |
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nbytes += count; |
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} |
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for (x = 0; x < rowlen / 2; x += 4) { |
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- fg_r = ntohs(row[x + 0]) / 256; |
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- fg_g = ntohs(row[x + 1]) / 256; |
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- fg_b = ntohs(row[x + 2]) / 256; |
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- opac = ntohs(row[x + 3]) / 256; |
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+ fg_r = ntohs(row[x + 0]) / 257; |
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+ fg_g = ntohs(row[x + 1]) / 257; |
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+ fg_b = ntohs(row[x + 2]) / 257; |
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+ opac = ntohs(row[x + 3]) / 257; |
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/* blend opaque part of image data with window backgro… |
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* emulate transparency */ |
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- img->buf[off++] = (fg_r * opac + bg_r * (255 - opac)) … |
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- img->buf[off++] = (fg_g * opac + bg_g * (255 - opac)) … |
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- img->buf[off++] = (fg_b * opac + bg_b * (255 - opac)) … |
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+ img->buf[off++] = (fg_r * opac + bg_r * (255 - opac)) … |
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+ img->buf[off++] = (fg_g * opac + bg_g * (255 - opac)) … |
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+ img->buf[off++] = (fg_b * opac + bg_b * (255 - opac)) … |
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} |
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} |
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