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chromahold: Fix hue calculation for red colors
Also make the calculation much more accurate...
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parent
10e0187df1
commit
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1 changed files with 9 additions and 8 deletions
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@ -52,7 +52,7 @@ GST_DEBUG_CATEGORY_STATIC (gst_chroma_hold_debug);
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#define DEFAULT_TARGET_R 255
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#define DEFAULT_TARGET_G 0
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#define DEFAULT_TARGET_B 0
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#define DEFAULT_TOLERANCE 2
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#define DEFAULT_TOLERANCE 30
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enum
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{
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@ -301,23 +301,24 @@ gst_chroma_hold_set_caps (GstBaseTransform * btrans,
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static inline gint
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rgb_to_hue (gint r, gint g, gint b)
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{
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gint m, M, C, h;
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gint m, M, C, C2, h;
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m = MIN (MIN (r, g), b);
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M = MAX (MAX (r, g), b);
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C = M - m;
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C2 = C >> 1;
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if (C == 0) {
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return G_MAXUINT;
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} else if (M == r) {
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h = ((g - b) / C) % 6;
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h = ((256 * 60 * (g - b) + C2) / C);
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} else if (M == g) {
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h = ((b - r) / C) + 2;
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} else { /* if (M == b) */
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h = ((r - g) / C) + 4;
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h = ((256 * 60 * (b - r) + C2) / C) + 120 * 256;
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} else {
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/* if (M == b) */
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h = ((256 * 60 * (r - g) + C2) / C) + 240 * 256;
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}
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h = 60 * h;
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h >>= 8;
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if (h >= 360)
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h -= 360;
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