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Improve readability of alpha-blending sections - farbfeld - suckless image form… |
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git clone git://git.suckless.org/farbfeld |
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--- |
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commit a5a5706f16408ce181775d319b264d03e67819f3 |
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parent 6afe09e729e3428a5317c57c8315897f7110bffa |
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Author: Laslo Hunhold <[email protected]> |
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Date: Fri, 14 Apr 2017 22:15:25 +0200 |
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Improve readability of alpha-blending sections |
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Diffstat: |
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M ff2jpg.c | 6 ++++-- |
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M ff2ppm.c | 6 ++++-- |
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2 files changed, 8 insertions(+), 4 deletions(-) |
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--- |
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diff --git a/ff2jpg.c b/ff2jpg.c |
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@@ -106,9 +106,11 @@ main(int argc, char *argv[]) |
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for (j = 0, k = 0; j < rowlen; j += 4, k += 3) { |
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a = ntohs(row[j + 3]); |
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for (l = 0; l < 3; l++) { |
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+ /* alpha blending and 8-bit-reduction */ |
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rowout[k + l] = (a * ntohs(row[j + l]) + |
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- (65535 - a) * mask[l]) / |
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- (257 * 65535); |
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+ (UINT16_MAX - a) * mask[l]) / |
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+ (UINT16_MAX * |
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+ (UINT16_MAX / UINT8_MAX)); |
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} |
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} |
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jpeg_write_scanlines(&jcomp, &rowout, 1); |
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diff --git a/ff2ppm.c b/ff2ppm.c |
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@@ -66,9 +66,11 @@ main(int argc, char *argv[]) |
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for (j = 0, k = 0; j < rowlen; j += 4, k += 3) { |
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a = ntohs(row[j + 3]); |
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for (l = 0; l < 3; l++) { |
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+ /* alpha blending and 8-bit-reduction */ |
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rowout[k + l] = (a * ntohs(row[j + l]) + |
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- (65535 - a) * mask[l]) / |
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- (257 * 65535); |
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+ (UINT16_MAX - a) * mask[l]) / |
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+ (UINT16_MAX * |
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+ (UINT16_MAX / UINT8_MAX)); |
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} |
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} |
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if (fwrite(rowout, sizeof(uint8_t), rowoutlen, stdout) != rowo… |
