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eeshow/diff.c (differences): clean up pixel processing
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@ -28,6 +28,12 @@
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#define DEFAULT_FRAME_RADIUS 30
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#define FADE_SHIFT 3
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#define FADE_MASK ((0xff >> FADE_SHIFT) * (0x010101))
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#define FADE_OFFSET (~FADE_MASK & 0xffffff)
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#define MASK 0xffffff
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struct area {
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int xa, ya, xb, yb;
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@ -208,25 +214,20 @@ static void mark_area(struct diff *diff, int x, int y)
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}
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#define MASK 0xffffff
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static void differences(struct diff *diff, uint32_t *a, const uint32_t *b)
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{
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int x, y;
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unsigned skip = diff->w * 4 - diff->stride;
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int x, y;
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for (y = 0; y != diff->h; y++) {
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for (x = 0; x != diff->w; x++) {
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if (!((*a ^ *b) & MASK)) {
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*a = ((*a >> 3) & 0x1f1f1f) | 0xe0e0e0;
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// *a = ((*a >> 2) & 0x3f3f3f) | 0xc0c0c0;
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*a = ((*a >> FADE_SHIFT) & FADE_MASK) |
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FADE_OFFSET;
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} else {
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mark_area(diff, x, y);
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//fprintf(stderr, "0x%06x 0x%06x", *a, *b);
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*a = (*a & MASK) == MASK ? ONLY_NEW :
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(*b & MASK) == MASK ? ONLY_OLD : BOTH;
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//fprintf(stderr, "-> 0x%06x\n", *a);
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}
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a++;
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b++;
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