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add experimental test for blending math (disabled for now)

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git-svn-id: http://skia.googlecode.com/svn/trunk@2648 2bbb7eff-a529-9590-31e7-b0007b416f81
This commit is contained in:
reed@google.com 2011-11-09 17:12:08 +00:00
parent 5a412e51c8
commit 8d7e39c835
1 changed files with 56 additions and 0 deletions
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56
tests/MathTest.cpp
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@ -16,6 +16,59 @@ static float float_blend(int src, int dst, float unit) {
return dst + (src - dst) * unit;
}
static int blend31(int src, int dst, int a31) {
return dst + ((src - dst) * a31 * 2114 >> 16);
// return dst + ((src - dst) * a31 * 33 >> 10);
}
static int blend31_slow(int src, int dst, int a31) {
int prod = src * a31 + (31 - a31) * dst + 16;
prod = (prod + (prod >> 5)) >> 5;
return prod;
}
static int blend31_round(int src, int dst, int a31) {
int prod = (src - dst) * a31 + 16;
prod = (prod + (prod >> 5)) >> 5;
return dst + prod;
}
static int blend31_old(int src, int dst, int a31) {
a31 += a31 >> 4;
return dst + ((src - dst) * a31 >> 5);
}
static void test_blend31() {
int failed = 0;
int death = 0;
for (int src = 0; src <= 255; src++) {
for (int dst = 0; dst <= 255; dst++) {
for (int a = 0; a <= 31; a++) {
// int r0 = blend31(src, dst, a);
// int r0 = blend31_round(src, dst, a);
// int r0 = blend31_old(src, dst, a);
int r0 = blend31_slow(src, dst, a);
float f = float_blend(src, dst, a / 31.f);
int r1 = (int)f;
int r2 = SkScalarRoundToInt(SkFloatToScalar(f));
if (r0 != r1 && r0 != r2) {
printf("src:%d dst:%d a:%d result:%d float:%g\n",
src, dst, a, r0, f);
failed += 1;
}
if (r0 > 255) {
death += 1;
printf("death src:%d dst:%d a:%d result:%d float:%g\n",
src, dst, a, r0, f);
}
}
}
}
SkDebugf("---- failed %d death %d\n", failed, death);
}
static void test_blend(skiatest::Reporter* reporter) {
for (int src = 0; src <= 255; src++) {
for (int dst = 0; dst <= 255; dst++) {
@ -499,6 +552,9 @@ static void TestMath(skiatest::Reporter* reporter) {
#ifdef SK_SCALAR_IS_FLOAT
test_blend(reporter);
#endif
// disable for now
// test_blend31();
}
#include "TestClassDef.h"