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-rw-r--r--Build/source/libs/gd/libgd-src/src/gd_color.c30
1 files changed, 30 insertions, 0 deletions
diff --git a/Build/source/libs/gd/libgd-src/src/gd_color.c b/Build/source/libs/gd/libgd-src/src/gd_color.c
new file mode 100644
index 00000000000..6d8a8466b8a
--- /dev/null
+++ b/Build/source/libs/gd/libgd-src/src/gd_color.c
@@ -0,0 +1,30 @@
+#ifdef HAVE_CONFIG_H
+#include "config.h"
+#endif
+
+#include "gd.h"
+#include "gd_color.h"
+
+int gdColorMatch(gdImagePtr im, int col1, int col2, float threshold)
+{
+ const int dr = gdImageRed(im, col1) - gdImageRed(im, col2);
+ const int dg = gdImageGreen(im, col1) - gdImageGreen(im, col2);
+ const int db = gdImageBlue(im, col1) - gdImageBlue(im, col2);
+ const int da = gdImageAlpha(im, col1) - gdImageAlpha(im, col2);
+ const int dist = dr * dr + dg * dg + db * db + da * da;
+
+ return (100.0 * dist / 195075) < threshold;
+}
+
+/*
+ * To be implemented when we have more image formats.
+ * Buffer like gray8 gray16 or rgb8 will require some tweak
+ * and can be done in this function (called from the autocrop
+ * function. (Pierre)
+ */
+#if 0
+static int colors_equal (const int col1, const in col2)
+{
+
+}
+#endif