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-rw-r--r--ext/tarkin/yuv.c224
1 files changed, 224 insertions, 0 deletions
diff --git a/ext/tarkin/yuv.c b/ext/tarkin/yuv.c
new file mode 100644
index 00000000..6f5fb5c0
--- /dev/null
+++ b/ext/tarkin/yuv.c
@@ -0,0 +1,224 @@
+#include "yuv.h"
+
+/*#define TARKIN_YUV_EXACT*/
+/*#define TARKIN_YUV_LXY*/
+
+
+static inline
+uint8_t CLAMP(int16_t x)
+{
+ return ((x > 255) ? 255 : (x < 0) ? 0 : x);
+}
+
+
+
+void rgb24_to_yuv (uint8_t *rgb, Wavelet3DBuf *yuv [], uint32_t frame)
+{
+ int count = yuv[0]->width * yuv[0]->height;
+ int16_t *y = yuv[0]->data + frame * count;
+ int16_t *u = yuv[1]->data + frame * count;
+ int16_t *v = yuv[2]->data + frame * count;
+ int i;
+
+
+#if defined(TARKIN_YUV_EXACT)
+ for (i=0; i<count; i++, rgb+=3) {
+ y [i] = ((int16_t) 77 * rgb [0] + 150 * rgb [1] + 29 * rgb [2]) / 256;
+ u [i] = ((int16_t) -44 * rgb [0] - 87 * rgb [1] + 131 * rgb [2]) / 256;
+ v [i] = ((int16_t) 131 * rgb [0] - 110 * rgb [1] - 21 * rgb [2]) / 256;
+ }
+#elif defined(TARKIN_YUV_LXY)
+ for (i=0; i<count; i++, rgb+=3) {
+ y [i] = ((int16_t) 54 * rgb [0] + 182 * rgb [1] + 18 * rgb [2]) / 256;
+ u [i] = rgb [0] - y [i];
+ v [i] = rgb [2] - y [i];
+ }
+#else
+ for (i=0; i<count; i++, rgb+=3) {
+ v [i] = rgb [0] - rgb [1];
+ u [i] = rgb [2] - rgb [1];
+ y [i] = rgb [1] + (u [i] + v [i]) / 4;
+ }
+#endif
+}
+
+
+void yuv_to_rgb24 (Wavelet3DBuf *yuv [], uint8_t *rgb, uint32_t frame)
+{
+ int count = yuv[0]->width * yuv[0]->height;
+ int16_t *y = yuv[0]->data + frame * count;
+ int16_t *u = yuv[1]->data + frame * count;
+ int16_t *v = yuv[2]->data + frame * count;
+ int i;
+
+#if defined(TARKIN_YUV_EXACT)
+ for (i=0; i<count; i++, rgb+=3) {
+ rgb [0] = CLAMP(y [i] + 1.371 * v [i]);
+ rgb [1] = CLAMP(y [i] - 0.698 * v [i] - 0.336 * u [i]);
+ rgb [2] = CLAMP(y [i] + 1.732 * u [i]);
+ }
+#elif defined(TARKIN_YUV_LXY)
+ for (i=0; i<count; i++, rgb+=3) {
+ rgb [1] = CLAMP(y [i] - (76 * u [i] - 26 * v [i]) / 256);
+ rgb [0] = CLAMP(y [i] + u [i]);
+ rgb [2] = CLAMP(y [i] + v [i]);
+ }
+#else
+ for (i=0; i<count; i++, rgb+=3) {
+ rgb [1] = CLAMP(y [i] - (u [i] + v [i]) / 4);
+ rgb [2] = CLAMP(u [i] + rgb [1]);
+ rgb [0] = CLAMP(v [i] + rgb [1]);
+ }
+#endif
+}
+
+
+void rgb32_to_yuv (uint8_t *rgb, Wavelet3DBuf *yuv [], uint32_t frame)
+{
+ int count = yuv[0]->width * yuv[0]->height;
+ int16_t *y = yuv[0]->data + frame * count;
+ int16_t *u = yuv[1]->data + frame * count;
+ int16_t *v = yuv[2]->data + frame * count;
+ int i;
+
+#if defined(TARKIN_YUV_EXACT)
+ for (i=0; i<count; i++, rgb+=4) {
+ y [i] = ((int16_t) 77 * rgb [0] + 150 * rgb [1] + 29 * rgb [2]) / 256;
+ u [i] = ((int16_t) -44 * rgb [0] - 87 * rgb [1] + 131 * rgb [2]) / 256;
+ v [i] = ((int16_t) 131 * rgb [0] - 110 * rgb [1] - 21 * rgb [2]) / 256;
+ }
+#elif defined(TARKIN_YUV_LXY)
+ for (i=0; i<count; i++, rgb+=4) {
+ y [i] = ((int16_t) 54 * rgb [0] + 182 * rgb [1] + 18 * rgb [2]) / 256;
+ u [i] = rgb [0] - y [i];
+ v [i] = rgb [2] - y [i];
+ }
+#else
+ for (i=0; i<count; i++, rgb+=4) {
+ v [i] = rgb [0] - rgb [1];
+ u [i] = rgb [2] - rgb [1];
+ y [i] = rgb [1] + (u [i] + v [i]) / 4;
+ }
+#endif
+}
+
+
+void yuv_to_rgb32 (Wavelet3DBuf *yuv [], uint8_t *rgb, uint32_t frame)
+{
+ int count = yuv[0]->width * yuv[0]->height;
+ int16_t *y = yuv[0]->data + frame * count;
+ int16_t *u = yuv[1]->data + frame * count;
+ int16_t *v = yuv[2]->data + frame * count;
+ int i;
+
+#if defined(TARKIN_YUV_EXACT)
+ for (i=0; i<count; i++, rgb+=4) {
+ rgb [0] = CLAMP(y [i] + 1.371 * v [i]);
+ rgb [1] = CLAMP(y [i] - 0.698 * v [i] - 0.336 * u [i]);
+ rgb [2] = CLAMP(y [i] + 1.732 * u [i]);
+ }
+#elif defined(TARKIN_YUV_LXY)
+ for (i=0; i<count; i++, rgb+=4) {
+ rgb [1] = CLAMP(y [i] - (76 * u [i] - 26 * v [i]) / 256);
+ rgb [0] = CLAMP(y [i] + u [i]);
+ rgb [2] = CLAMP(y [i] + v [i]);
+ }
+#else
+ for (i=0; i<count; i++, rgb+=4) {
+ rgb [1] = CLAMP(y [i] - (u [i] + v [i]) / 4);
+ rgb [2] = CLAMP(u [i] + rgb [1]);
+ rgb [0] = CLAMP(v [i] + rgb [1]);
+ }
+#endif
+}
+
+
+void rgba_to_yuv (uint8_t *rgba, Wavelet3DBuf *yuva [], uint32_t frame)
+{
+ int count = yuva[0]->width * yuva[0]->height;
+ int16_t *y = yuva[0]->data + frame * count;
+ int16_t *u = yuva[1]->data + frame * count;
+ int16_t *v = yuva[2]->data + frame * count;
+ int16_t *a = yuva[3]->data + frame * count;
+ int i;
+
+#if defined(TARKIN_YUV_EXACT)
+ for (i=0; i<count; i++, rgba+=4) {
+ y [i] = ((int16_t) 77 * rgba [0] + 150 * rgba [1] + 29 * rgba [2]) / 256;
+ u [i] = ((int16_t) -44 * rgba [0] - 87 * rgba [1] + 131 * rgba [2]) / 256;
+ v [i] = ((int16_t) 131 * rgba [0] - 110 * rgba [1] - 21 * rgba [2]) / 256;
+ a [i] = rgba [3];
+ }
+#elif defined(TARKIN_YUV_LXY)
+ for (i=0; i<count; i++, rgba+=4) {
+ y [i] = ((int16_t) 54 * rgba [0] + 182 * rgba [1] + 18 * rgba [2]) / 256;
+ u [i] = rgba [0] - y [i];
+ v [i] = rgba [2] - y [i];
+ a [i] = rgba [3];
+ }
+#else
+ for (i=0; i<count; i++, rgba+=4) {
+ v [i] = rgba [0] - rgba [1];
+ u [i] = rgba [2] - rgba [1];
+ y [i] = rgba [1] + (u [i] + v [i]) / 4;
+ a [i] = rgba [3];
+ }
+#endif
+}
+
+
+void yuv_to_rgba (Wavelet3DBuf *yuva [], uint8_t *rgba, uint32_t frame)
+{
+ int count = yuva[0]->width * yuva[0]->height;
+ int16_t *y = yuva[0]->data + frame * count;
+ int16_t *u = yuva[1]->data + frame * count;
+ int16_t *v = yuva[2]->data + frame * count;
+ int16_t *a = yuva[3]->data + frame * count;
+ int i;
+
+#if defined(TARKIN_YUV_EXACT)
+ for (i=0; i<count; i++, rgba+=4) {
+ rgba [0] = CLAMP(y [i] + 1.371 * v [i]);
+ rgba [1] = CLAMP(y [i] - 0.698 * v [i] - 0.336 * u [i]);
+ rgba [2] = CLAMP(y [i] + 1.732 * u [i]);
+ rgba [3] = a [i];
+ }
+#elif defined(TARKIN_YUV_LXY)
+ for (i=0; i<count; i++, rgba+=4) {
+ rgba [1] = CLAMP(y [i] - (76 * u [i] - 26 * v [i]) / 256);
+ rgba [0] = CLAMP(y [i] + u [i]);
+ rgba [2] = CLAMP(y [i] + v [i]);
+ rgba [3] = a [i];
+ }
+#else
+ for (i=0; i<count; i++, rgba+=4) {
+ rgba [1] = CLAMP(y [i] - (u [i] + v [i]) / 4);
+ rgba [2] = CLAMP(u [i] + rgba [1]);
+ rgba [0] = CLAMP(v [i] + rgba [1]);
+ rgba [3] = a [i];
+ }
+#endif
+}
+
+void grayscale_to_y (uint8_t *rgba, Wavelet3DBuf *y [], uint32_t frame)
+{
+ int count = y[0]->width * y[0]->height;
+ int16_t *_y = y[0]->data + frame * count;
+ int i;
+
+ for (i=0; i<count; i++)
+ _y [i] = rgba [i];
+}
+
+
+void y_to_grayscale (Wavelet3DBuf *y [], uint8_t *rgba, uint32_t frame)
+{
+ int count = y[0]->width * y[0]->height;
+ int16_t *_y = y[0]->data + frame * count;
+ int i;
+
+ for (i=0; i<count; i++)
+ rgba [i] = CLAMP(_y[i]);
+}
+
+
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