ACME-1236 : Add lines as a new type of vignette and Brightscan as an example

2 files changed, 24 insertions, 6 deletions

diff --git a/indra/llimage/llimage.cpp b/indra/llimage/llimage.cpp
index 14fa71d828..3105fe3746 100755
--- a/indra/llimage/llimage.cpp
+++ b/indra/llimage/llimage.cpp
@@ -1372,9 +1372,10 @@ void LLImageRaw::filterScreen(EScreenMode mode, const S32 wave_length, const F32
 	}
 }
 
-void LLImageRaw::setVignette(EVignetteMode mode, F32 gamma, F32 min)
+void LLImageRaw::setVignette(EVignetteMode mode, EVignetteType type, F32 gamma, F32 min)
 {
     mVignetteMode = mode;
+    mVignetteType = type;
     mVignetteGamma = gamma;
     mVignetteMin = llclampf(min);
     // We always center the vignette on the image and fits it in the image smallest dimension
@@ -1385,10 +1386,20 @@ void LLImageRaw::setVignette(EVignetteMode mode, F32 gamma, F32 min)
 
 F32 LLImageRaw::getVignetteAlpha(S32 i, S32 j)
 {
-    // alpha is a modified gaussian value, with a center and fading in a circular pattern toward the edges
-    // The gamma parameter controls the intensity of the drop down from alpha 1.0 (center) to 0.0
-    F32 d_center_square = (i - mVignetteCenterX)*(i - mVignetteCenterX) + (j - mVignetteCenterY)*(j - mVignetteCenterY);
-    F32 alpha = powf(F_E, -(powf((d_center_square/(mVignetteWidth*mVignetteWidth)),mVignetteGamma)/2.0f));
+    F32 alpha = 1.0;
+    if (mVignetteType == VIGNETTE_TYPE_CENTER)
+    {
+        // alpha is a modified gaussian value, with a center and fading in a circular pattern toward the edges
+        // The gamma parameter controls the intensity of the drop down from alpha 1.0 (center) to 0.0
+        F32 d_center_square = (i - mVignetteCenterX)*(i - mVignetteCenterX) + (j - mVignetteCenterY)*(j - mVignetteCenterY);
+        alpha = powf(F_E, -(powf((d_center_square/(mVignetteWidth*mVignetteWidth)),mVignetteGamma)/2.0f));
+    }
+    else if (mVignetteType == VIGNETTE_TYPE_LINES)
+    {
+        // alpha varies according to a squared sine function vertically.
+        // gamma is interpreted as the wavelength (in pixels) of the sine in that case.
+        alpha = (sinf(2*F_PI*j/mVignetteGamma) > 0.0 ? 1.0 : 0.0);
+    }
     // We rescale alpha between min and 1.0 so to avoid complete fading if so desired.
     return (mVignetteMin + alpha * (1.0 - mVignetteMin));
 }
diff --git a/indra/llimage/llimage.h b/indra/llimage/llimage.h
index f2bb91a329..a600f2e4a6 100755
--- a/indra/llimage/llimage.h
+++ b/indra/llimage/llimage.h
@@ -95,6 +95,12 @@ typedef enum e_vignette_mode
 	VIGNETTE_MODE_FADE  = 2
 } EVignetteMode;
 
+typedef enum e_vignette_type
+{
+	VIGNETTE_TYPE_CENTER = 0,
+	VIGNETTE_TYPE_LINES  = 1
+} EVignetteType;
+
 typedef enum e_screen_mode
 {
 	SCREEN_MODE_2DSINE   = 0,
@@ -173,6 +179,7 @@ protected:
     
     // Vignette filtering
     EVignetteMode mVignetteMode;
+    EVignetteType mVignetteType;
     S32 mVignetteCenterX;
     S32 mVignetteCenterY;
     S32 mVignetteWidth;
@@ -306,7 +313,7 @@ public:
     void colorTransform(const LLMatrix3 &transform);
     void colorCorrect(const U8* lut_red, const U8* lut_green, const U8* lut_blue);
     void filterScreen(EScreenMode mode, const S32 wave_length, const F32 angle);
-    void setVignette(EVignetteMode mode, F32 gamma, F32 min);
+    void setVignette(EVignetteMode mode, EVignetteType type, F32 gamma, F32 min);
     U32* getBrightnessHistogram();
 
 protected: