Index: experimental/skpdiff/SkPMetric.cpp |
diff --git a/experimental/skpdiff/SkPMetric.cpp b/experimental/skpdiff/SkPMetric.cpp |
index e6210bfa3673daeff910e31c3eaa85cd60fa6fad..a19ed826f8f1cd344708a65dd51ade5beb4b6c0d 100644 |
--- a/experimental/skpdiff/SkPMetric.cpp |
+++ b/experimental/skpdiff/SkPMetric.cpp |
@@ -90,8 +90,7 @@ typedef ImageArray<float> ImageL3D; |
#define MAT_ROW_MULT(rc,gc,bc) r*rc + g*gc + b*bc |
- |
-void adobergb_to_cielab(float r, float g, float b, LAB* lab) { |
+static void adobergb_to_cielab(float r, float g, float b, LAB* lab) { |
// Conversion of Adobe RGB to XYZ taken from from "Adobe RGB (1998) ColorImage Encoding" |
// URL:http://www.adobe.com/digitalimag/pdfs/AdobeRGB1998.pdf |
// Section: 4.3.5.3 |
@@ -152,7 +151,7 @@ static void bitmap_to_cielab(const SkBitmap* bitmap, ImageLAB* outImageLAB) { |
// From Barten SPIE 1989 |
static float contrast_sensitivity(float cyclesPerDegree, float luminance) { |
float a = 440.0f * powf(1.0f + 0.7f / luminance, -0.2f); |
- float b = 0.3f * powf(1 + 100.0 / luminance, 0.15f); |
+ float b = 0.3f * powf(1.0f + 100.0f / luminance, 0.15f); |
return a * |
cyclesPerDegree * |
expf(-b * cyclesPerDegree) * |
@@ -259,14 +258,20 @@ static void convolve(const ImageL* imageL, bool vertical, ImageL* outImageL) { |
} |
} |
-float pmetric(const ImageLAB* baselineLAB, const ImageLAB* testLAB, SkTDArray<SkIPoint>* poi) { |
+static double pmetric(const ImageLAB* baselineLAB, const ImageLAB* testLAB, SkTDArray<SkIPoint>* poi) { |
int width = baselineLAB->width; |
int height = baselineLAB->height; |
- int maxLevels = (int)log2(width < height ? width : height); |
+ int maxLevels = 0; |
+ |
+ // Calculates how many levels to make by how many times the image can be divided in two |
+ int smallerDimension = width < height ? width : height; |
+ for ( ; smallerDimension > 1; smallerDimension /= 2) { |
+ maxLevels++; |
+ } |
- const float fov = M_PI / 180.0f * 45.0f; |
+ const float fov = SK_ScalarPI / 180.0f * 45.0f; |
float contrastSensitivityMax = contrast_sensitivity(3.248f, 100.0f); |
- float pixelsPerDegree = width / (2.0f * tanf(fov * 0.5f) * 180.0f / M_PI); |
+ float pixelsPerDegree = width / (2.0f * tanf(fov * 0.5f) * 180.0f / SK_ScalarPI); |
ImageL3D baselineL(width, height, maxLevels); |
ImageL3D testL(width, height, maxLevels); |
@@ -326,8 +331,8 @@ float pmetric(const ImageLAB* baselineLAB, const ImageLAB* testLAB, SkTDArray<Sk |
testL.getLayer(maxLevels - 1)->readPixel(x, y, &avgLTest); |
float lAdapt = 0.5f * (avgLBaseline + avgLTest); |
- if (lAdapt < 1e-5) { |
- lAdapt = 1e-5; |
+ if (lAdapt < 1e-5f) { |
+ lAdapt = 1e-5f; |
} |
float contrastSum = 0.0f; |
@@ -352,15 +357,15 @@ float pmetric(const ImageLAB* baselineLAB, const ImageLAB* testLAB, SkTDArray<Sk |
baselineContrast2 : testContrast2; |
// Avoid divides by close to zero |
- if (denominator < 1e-5) { |
- denominator = 1e-5; |
+ if (denominator < 1e-5f) { |
+ denominator = 1e-5f; |
} |
contrast[levelIndex] = numerator / denominator; |
contrastSum += contrast[levelIndex]; |
} |
- if (contrastSum < 1e-5) { |
- contrastSum = 1e-5; |
+ if (contrastSum < 1e-5f) { |
+ contrastSum = 1e-5f; |
} |
float F = 0.0f; |