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Unified Diff: experimental/skpdiff/SkPMetric.cpp

Issue 19787006: ports for mac, ios, android, linux, windows (Closed) Base URL: https://skia.googlecode.com/svn/trunk
Patch Set: Created 7 years, 5 months ago
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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;

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