Minor cleanup of a few RS filter ports.

on Manta these reduce the times from
Contrast: 180ms to 21ms
Exposure: 177ms to 19ms

Change-Id: I1224ecaeaee22dc49069383e2f000a193c331b4c

5 files changed, 25 insertions, 34 deletions

diff --git a/tests/RenderScriptTests/ImageProcessing/src/com/android/rs/image/Contrast.java b/tests/RenderScriptTests/ImageProcessing/src/com/android/rs/image/Contrast.java
index 80e0f1a..f3cf1b7 100644
--- a/tests/RenderScriptTests/ImageProcessing/src/com/android/rs/image/Contrast.java
+++ b/tests/RenderScriptTests/ImageProcessing/src/com/android/rs/image/Contrast.java
@@ -28,7 +28,7 @@ public class Contrast extends TestBase {
     }
 
     public void runTest() {
-        mScript.set_bright(50.f);
+        mScript.invoke_setBright(50.f);
         mScript.forEach_contrast(mInPixelsAllocation, mOutPixelsAllocation);
     }
 
diff --git a/tests/RenderScriptTests/ImageProcessing/src/com/android/rs/image/Exposure.java b/tests/RenderScriptTests/ImageProcessing/src/com/android/rs/image/Exposure.java
index 6aad4be..bec53ab 100644
--- a/tests/RenderScriptTests/ImageProcessing/src/com/android/rs/image/Exposure.java
+++ b/tests/RenderScriptTests/ImageProcessing/src/com/android/rs/image/Exposure.java
@@ -28,7 +28,7 @@ public class Exposure extends TestBase {
     }
 
     public void runTest() {
-        mScript.set_bright(50.f);
+        mScript.invoke_setBright(50.f);
         mScript.forEach_exposure(mInPixelsAllocation, mOutPixelsAllocation);
     }
 
diff --git a/tests/RenderScriptTests/ImageProcessing/src/com/android/rs/image/bwfilter.rs b/tests/RenderScriptTests/ImageProcessing/src/com/android/rs/image/bwfilter.rs
index 80a626a..2818bf5 100644
--- a/tests/RenderScriptTests/ImageProcessing/src/com/android/rs/image/bwfilter.rs
+++ b/tests/RenderScriptTests/ImageProcessing/src/com/android/rs/image/bwfilter.rs
@@ -48,6 +48,6 @@ void bwFilterKernel(const uchar4 *in, uchar4 *out) {
     localMin = fmin(r,localMin);
     localMax = fmax(g,b);
     localMax = fmax(r,localMax);
-    avg =(localMin+localMax)/2;
+    avg = (localMin+localMax) * 0.5f;
     out->r = out->g = out->b = rsClamp(avg, 0, 255);
 }
diff --git a/tests/RenderScriptTests/ImageProcessing/src/com/android/rs/image/contrast.rs b/tests/RenderScriptTests/ImageProcessing/src/com/android/rs/image/contrast.rs
index 987315e..5fd7be1 100644
--- a/tests/RenderScriptTests/ImageProcessing/src/com/android/rs/image/contrast.rs
+++ b/tests/RenderScriptTests/ImageProcessing/src/com/android/rs/image/contrast.rs
@@ -16,27 +16,24 @@
 
 #pragma version(1)
 #pragma rs java_package_name(com.android.rs.image)
-#pragma rs_fp_relaxed
+#pragma rs_fp_full
 
-float bright = 0.f;
+static float brightM = 0.f;
+static float brightC = 0.f;
 
-static unsigned char contrastClamp(int c)
-{
-    int N = 255;
-    c &= ~(c >> 31);
-    c -= N;
-    c &= (c >> 31);
-    c += N;
-    return  (unsigned char) c;
+void setBright(float v) {
+    brightM = pow(2.f, v / 100.f);
+    brightC = 127.f - brightM * 127.f;
 }
 
 void contrast(const uchar4 *in, uchar4 *out)
 {
-    float m =  (float)pow(2, bright/100.f);
-    float c =  127-m*127;
-
-    out->r = contrastClamp((int)(m*in->r+c));
-    out->g = contrastClamp((int)(m*in->g+c));
-    out->b = contrastClamp((int)(m*in->b+c));
-
+#if 0
+    out->r = rsClamp((int)(brightM * in->r + brightC), 0, 255);
+    out->g = rsClamp((int)(brightM * in->g + brightC), 0, 255);
+    out->b = rsClamp((int)(brightM * in->b + brightC), 0, 255);
+#else
+    float3 v = convert_float3(in->rgb) * brightM + brightC;
+    out->rgb = convert_uchar3(clamp(v, 0.f, 255.f));
+#endif
 }
diff --git a/tests/RenderScriptTests/ImageProcessing/src/com/android/rs/image/exposure.rs b/tests/RenderScriptTests/ImageProcessing/src/com/android/rs/image/exposure.rs
index d15fd87..adfae4a 100644
--- a/tests/RenderScriptTests/ImageProcessing/src/com/android/rs/image/exposure.rs
+++ b/tests/RenderScriptTests/ImageProcessing/src/com/android/rs/image/exposure.rs
@@ -16,24 +16,18 @@
 
 #pragma version(1)
 #pragma rs java_package_name(com.android.rs.image)
-#pragma rs_fp_relaxed
+#pragma rs_fp_full
 
-float bright = 0.f;
+static float bright = 0.f;
 
-static unsigned char contrastClamp(int c)
-{
-    int N = 255;
-    c &= ~(c >> 31);
-    c -= N;
-    c &= (c >> 31);
-    c += N;
-    return  (unsigned char) c;
+void setBright(float v) {
+    bright = 255.f / (255.f - v);
 }
 
 void exposure(const uchar4 *in, uchar4 *out)
 {
-    int m = 255 - bright;
-    out->r = contrastClamp((255 * in->r)/m);
-    out->g = contrastClamp((255 * in->g)/m);
-    out->b = contrastClamp((255 * in->b)/m);
+    out->r = rsClamp((int)(bright * in->r), 0, 255);
+    out->g = rsClamp((int)(bright * in->g), 0, 255);
+    out->b = rsClamp((int)(bright * in->b), 0, 255);
 }
+