ACME-1236 : WIP : Add 2 new color correction filters. Add a la Instagram composite filters for testing in llimage_libtest

2 files changed, 36 insertions, 1 deletions

diff --git a/indra/llimage/llimage.cpp b/indra/llimage/llimage.cpp
index d84989f9c8..3d86abb26d 100755
--- a/indra/llimage/llimage.cpp
+++ b/indra/llimage/llimage.cpp
@@ -1045,6 +1045,22 @@ void LLImageRaw::filterGamma(F32 gamma)
     colorCorrect(gamma_lut,gamma_lut,gamma_lut);
 }
 
+void LLImageRaw::filterColorBalance(F32 gamma_red, F32 gamma_green, F32 gamma_blue)
+{
+    U8 gamma_red_lut[256];
+    U8 gamma_green_lut[256];
+    U8 gamma_blue_lut[256];
+    
+    for (S32 i = 0; i < 256; i++)
+    {
+        gamma_red_lut[i]   = (U8)(255.0 * (llclampf((float)(pow((float)(i)/255.0,gamma_red)))));
+        gamma_green_lut[i] = (U8)(255.0 * (llclampf((float)(pow((float)(i)/255.0,gamma_green)))));
+        gamma_blue_lut[i]  = (U8)(255.0 * (llclampf((float)(pow((float)(i)/255.0,gamma_blue)))));
+    }
+    
+    colorCorrect(gamma_red_lut,gamma_green_lut,gamma_blue_lut);
+}
+
 void LLImageRaw::filterLinearize(F32 tail)
 {
     // Get the histogram
@@ -1191,6 +1207,23 @@ void LLImageRaw::filterBrightness(S32 add)
     colorCorrect(brightness_lut,brightness_lut,brightness_lut);
 }
 
+void LLImageRaw::filterMinMax(S32 min, S32 max)
+{
+    U8 contrast_lut[256];
+    min = llclampb(min);
+    max = llclampb(max);
+    
+    F32 slope = 255.0/(F32)(max - min);
+    F32 translate = -slope*min;
+    
+    for (S32 i = 0; i < 256; i++)
+    {
+        contrast_lut[i] = (U8)(llclampb((S32)(slope*i + translate)));
+    }
+    
+    colorCorrect(contrast_lut,contrast_lut,contrast_lut);    
+}
+
 // Filter Primitives
 void LLImageRaw::colorTransform(const LLMatrix3 &transform)
 {
diff --git a/indra/llimage/llimage.h b/indra/llimage/llimage.h
index 404f1c0769..6e58453da5 100755
--- a/indra/llimage/llimage.h
+++ b/indra/llimage/llimage.h
@@ -289,7 +289,9 @@ public:
     void filterColorize(const LLColor4U& color);    // Colorize with color. Alpha will be taken into account for colorization intensity.
     void filterContrast(F32 slope);                 // Change contrast according to slope: > 1.0 more contrast, < 1.0 less contrast
     void filterBrightness(S32 add);                 // Change brightness according to add: > 0 brighter, < 0 darker
-    
+    void filterColorBalance(F32 gamma_red, F32 gamma_green, F32 gamma_blue); // Change the color balance applying gammas to each channel
+    void filterMinMax(S32 min, S32 max);            // Redistribute contrast / brightness between min and max in a linear way
+   
     // Filter Primitives
     void colorTransform(const LLMatrix3 &transform);
     void colorCorrect(const U8* lut_red, const U8* lut_green, const U8* lut_blue);