add experimental test for different 8888->565 blends (disabled)
git-svn-id: http://skia.googlecode.com/svn/trunk@5916 2bbb7eff-a529-9590-31e7-b0007b416f81
diff --git a/tests/ColorTest.cpp b/tests/ColorTest.cpp
index 86729d2..55fdd74 100644
--- a/tests/ColorTest.cpp
+++ b/tests/ColorTest.cpp
@@ -12,6 +12,112 @@
#include "SkRandom.h"
#include "SkUnPreMultiply.h"
+#define GetPackedR16As32(packed) (SkGetPackedR16(dc) << (8 - SK_R16_BITS))
+#define GetPackedG16As32(packed) (SkGetPackedG16(dc) << (8 - SK_G16_BITS))
+#define GetPackedB16As32(packed) (SkGetPackedB16(dc) << (8 - SK_B16_BITS))
+
+static bool S32A_D565_Blend_0(SkPMColor sc, uint16_t dc, U8CPU alpha) {
+ unsigned dst_scale = 255 - SkMulDiv255Round(SkGetPackedA32(sc), alpha);
+ unsigned dr = SkMulS16(SkPacked32ToR16(sc), alpha) + SkMulS16(SkGetPackedR16(dc), dst_scale);
+ unsigned dg = SkMulS16(SkPacked32ToG16(sc), alpha) + SkMulS16(SkGetPackedG16(dc), dst_scale);
+
+ unsigned rr = SkDiv255Round(dr);
+ unsigned rg = SkDiv255Round(dg);
+
+ if (rr <= 31 && rg <= 63) {
+ return true;
+ }
+ return false;
+}
+
+static bool S32A_D565_Blend_01(SkPMColor sc, uint16_t dc, U8CPU alpha) {
+ unsigned dst_scale = 255 - SkMulDiv255Round(SkGetPackedA32(sc), alpha);
+ unsigned dr = SkMulS16(SkGetPackedR32(sc), alpha) + SkMulS16(SkGetPackedR16(dc) << 3, dst_scale);
+ unsigned dg = SkMulS16(SkGetPackedG32(sc), alpha) + SkMulS16(SkGetPackedG16(dc) << 2, dst_scale);
+
+ unsigned rr = SkDiv255Round(dr) >> 3;
+ unsigned rg = SkDiv255Round(dg) >> 2;
+
+ if (rr <= 31 && rg <= 63) {
+ return true;
+ }
+ return false;
+}
+
+static bool S32A_D565_Blend_02(SkPMColor sc, uint16_t dc, U8CPU alpha) {
+ unsigned dst_scale = 255 - SkMulDiv255Round(SkGetPackedA32(sc), alpha);
+ unsigned dr = SkMulS16(SkGetPackedR32(sc), alpha) + SkMulS16(GetPackedR16As32(dc), dst_scale);
+ unsigned dg = SkMulS16(SkGetPackedG32(sc), alpha) + SkMulS16(GetPackedG16As32(dc), dst_scale);
+ unsigned db = SkMulS16(SkGetPackedB32(sc), alpha) + SkMulS16(GetPackedB16As32(dc), dst_scale);
+ int rc = SkPack888ToRGB16(SkDiv255Round(dr),
+ SkDiv255Round(dg),
+ SkDiv255Round(db));
+
+ unsigned rr = SkGetPackedR16(rc);
+ unsigned rg = SkGetPackedG16(rc);
+
+ if (rr <= 31 && rg <= 63) {
+ return true;
+ }
+ return false;
+}
+
+static bool S32A_D565_Blend_1(SkPMColor sc, uint16_t dc, U8CPU alpha) {
+ unsigned dst_scale = 255 - SkMulDiv255Round(SkGetPackedA32(sc), alpha);
+ unsigned dr = (SkMulS16(SkGetPackedR32(sc), alpha) >> 3) + SkMulS16(SkGetPackedR16(dc), dst_scale);
+ unsigned dg = (SkMulS16(SkGetPackedG32(sc), alpha) >> 2) + SkMulS16(SkGetPackedG16(dc), dst_scale);
+
+ unsigned rr = SkDiv255Round(dr);
+ unsigned rg = SkDiv255Round(dg);
+
+ if (rr <= 31 && rg <= 63) {
+ return true;
+ }
+ return false;
+}
+
+static int SkDiv65025Round(int x) {
+ return (x + 65025/2) / 65025;
+// return x / 65025;
+}
+static bool S32A_D565_Blend_2(SkPMColor sc, uint16_t dc, U8CPU alpha) {
+ unsigned dst_scale = 255*255 - SkGetPackedA32(sc) * alpha;
+ alpha *= 255;
+ unsigned dr = (SkGetPackedR32(sc) >> 3) * alpha + SkGetPackedR16(dc) * dst_scale;
+ unsigned dg = (SkGetPackedG32(sc) >> 2) * alpha + SkGetPackedG16(dc) * dst_scale;
+
+ unsigned rr = SkDiv65025Round(dr);
+ unsigned rg = SkDiv65025Round(dg);
+
+ if (rr <= 31 && rg <= 63) {
+ return true;
+ }
+ return false;
+}
+
+static void test_565blend(skiatest::Reporter* reporter) {
+ int total_failures = 0;
+ for (int global_alpha = 0; global_alpha <= 255; ++global_alpha) {
+ int failures = 0;
+ int total = 0;
+ for (int src_a = 0; src_a <= 255; ++src_a) {
+ for (int src_c = 0; src_c <= src_a; ++src_c) {
+ SkPMColor sc = SkPackARGB32(src_a, src_c, src_c, src_c);
+ for (int dst_r = 0; dst_r <= 31; ++dst_r) {
+ for (int dst_g = 0; dst_g <= 63; ++dst_g) {
+ uint16_t dc = SkPackRGB16(dst_r, dst_g, dst_r);
+ failures += !S32A_D565_Blend_0(sc, dc, global_alpha);
+ total += 1;
+ }
+ }
+ }
+ }
+ SkDebugf("global_alpha=%d failures=%d total=%d %g\n", global_alpha, failures, total, failures * 100.0 / total);
+ total_failures += failures;
+ }
+ SkDebugf("total failures %d\n", total_failures);
+}
+
static void test_premul(skiatest::Reporter* reporter) {
for (int a = 0; a <= 255; a++) {
for (int x = 0; x <= 255; x++) {
@@ -76,6 +182,7 @@
test_premul(reporter);
//test_interp(reporter);
test_fast_interp(reporter);
+// test_565blend(reporter);
}
#include "TestClassDef.h"