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-rw-r--r--graphics/scaler/intern.h47
1 files changed, 47 insertions, 0 deletions
diff --git a/graphics/scaler/intern.h b/graphics/scaler/intern.h
index b1219fb909..72f3232ee2 100644
--- a/graphics/scaler/intern.h
+++ b/graphics/scaler/intern.h
@@ -68,6 +68,29 @@ static inline uint32 interpolate32_3_1(uint32 p1, uint32 p2) {
}
/**
+ * Interpolate two 32 bit pixels with weights 2 and 1 and 1, i.e., (2*p1+p2)/3.
+ */
+template<typename ColorMask>
+uint32 interpolate32_2_1(uint32 pixel1, uint32 pixel2)
+{
+ uint32 rsum, gsum, bsum;
+
+ rsum = (pixel1 & ColorMask::kRedMask) << 1;
+ rsum += (pixel2 & ColorMask::kRedMask);
+ rsum /= 3;
+
+ gsum = (pixel1 & ColorMask::kGreenMask) << 1;
+ gsum += (pixel2 & ColorMask::kGreenMask);
+ gsum /= 3;
+
+ bsum = (pixel1 & ColorMask::kBlueMask) << 1;
+ bsum += (pixel2 & ColorMask::kBlueMask);
+ bsum /= 3;
+
+ return (rsum & ColorMask::kRedMask) | (gsum & ColorMask::kGreenMask) | (bsum & ColorMask::kBlueMask);
+}
+
+/**
* Interpolate two 32 bit pixels with weights 5 and 3 and 1, i.e., (5*p1+3*p2)/8.
* @see interpolate_32_3_1 for similar method
*/
@@ -294,6 +317,30 @@ static inline unsigned interpolate16_3_1(unsigned p1, unsigned p2) {
}
/**
+ * Interpolate two 16 bit pixels with weights 2 and 1, i.e., (2*p1+p2)/3.
+ */
+template<typename ColorMask>
+uint16 interpolate16_2_1(uint16 pixel1, uint16 pixel2)
+{
+ uint32 rsum;
+ uint16 gsum, bsum;
+
+ rsum = (pixel1 & ColorMask::kRedMask) << 1;
+ rsum += (pixel2 & ColorMask::kRedMask);
+ rsum /= 3;
+
+ gsum = (pixel1 & ColorMask::kGreenMask) << 1;
+ gsum += (pixel2 & ColorMask::kGreenMask);
+ gsum /= 3;
+
+ bsum = (pixel1 & ColorMask::kBlueMask) << 1;
+ bsum += (pixel2 & ColorMask::kBlueMask);
+ bsum /= 3;
+
+ return (rsum & ColorMask::kRedMask) | (gsum & ColorMask::kGreenMask) | (bsum & ColorMask::kBlueMask);
+}
+
+/**
* Interpolate two 16 bit pixels with weights 5 and 3 and 1, i.e., (5*p1+3*p2)/8.
*/
template<typename ColorMask>