rgb2rgb: rgb12to15()

Signed-off-by: Ronald S. Bultje <rsbultje@gmail.com>

1 files changed, 19 insertions, 0 deletions

diff --git a/libswscale/rgb2rgb.c b/libswscale/rgb2rgb.c
index 9fbb6cfd60..47b06f53fc 100644
--- a/libswscale/rgb2rgb.c
+++ b/libswscale/rgb2rgb.c
@@ -183,6 +183,25 @@ void rgb16tobgr32(const uint8_t *src, uint8_t *dst, int src_size)
     }
 }
 
+void rgb12to15(const uint8_t *src, uint8_t *dst, int src_size)
+{
+    const uint16_t *end;
+    uint16_t *d = (uint16_t *)dst;
+    const uint16_t *s = (const uint16_t *)src;
+    uint16_t rgb, r, g, b;
+    end = s + src_size / 2;
+    while (s < end) {
+        rgb = *s++;
+        r = rgb & 0xF00;
+        g = rgb & 0x0F0;
+        b = rgb & 0x00F;
+        r = (r << 3) | ((r & 0x800) >> 1);
+        g = (g << 2) | ((g & 0x080) >> 2);
+        b = (b << 1) | ( b          >> 3);
+        *d++ = r | g | b;
+    }
+}
+
 void rgb16to24(const uint8_t *src, uint8_t *dst, int src_size)
 {
     const uint16_t *end;