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add test for different srcover implementations

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git-svn-id: http://skia.googlecode.com/svn/trunk@103 2bbb7eff-a529-9590-31e7-b0007b416f81
This commit is contained in:
reed@android.com 2009-03-03 18:35:18 +00:00
parent 5755a2a9ab
commit d66efc273e
4 changed files with 85 additions and 2 deletions
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4
Makefile
View File

@ -92,8 +92,8 @@ bench: $(BENCH_OBJS) out/libskia.a
TESTS_SRCS := GeometryTest.cpp MathTest.cpp MatrixTest.cpp PackBitsTest.cpp \
Sk64Test.cpp StringTest.cpp Test.cpp UtilsTest.cpp PathTest.cpp \
ClipCubicTest.cpp \
main.cpp
ClipCubicTest.cpp SrcOverTest.cpp main.cpp
TESTS_SRCS := $(addprefix tests/, $(TESTS_SRCS))
TESTS_OBJS := $(TESTS_SRCS:.cpp=.o)

71
tests/SrcOverTest.cpp Normal file
View File

@ -0,0 +1,71 @@
#include "Test.h"
#include "SkColorPriv.h"
#include "SkXfermode.h"
// our std SkAlpha255To256
static int test_srcover0(unsigned dst, unsigned alpha) {
return alpha + SkAlphaMul(dst, SkAlpha255To256(255 - alpha));
}
// faster hack +1
static int test_srcover1(unsigned dst, unsigned alpha) {
return alpha + SkAlphaMul(dst, 256 - alpha);
}
// slower "correct"
static int test_srcover2(unsigned dst, unsigned alpha) {
return alpha + SkMulDiv255Round(dst, 255 - alpha);
}
static void test_srcover_hack(skiatest::Reporter* reporter) {
/* Here's the idea. Can we ensure that when we blend on top of an opaque
dst, that the result always stay's opaque (i.e. exactly 255)?
*/
unsigned i;
int opaqueCounter0 = 0;
int opaqueCounter1 = 0;
int opaqueCounter2 = 0;
for (i = 0; i <= 255; i++) {
unsigned result0 = test_srcover0(0xFF, i);
unsigned result1 = test_srcover1(0xFF, i);
unsigned result2 = test_srcover2(0xFF, i);
opaqueCounter0 += (result0 == 0xFF);
opaqueCounter1 += (result1 == 0xFF);
opaqueCounter2 += (result2 == 0xFF);
}
#if 0
SkDebugf("---- opaque test: [%d %d %d]\n",
opaqueCounter0, opaqueCounter1, opaqueCounter2);
#endif
// we acknowledge that technique0 does not always return opaque
REPORTER_ASSERT(reporter, opaqueCounter0 == 129);
REPORTER_ASSERT(reporter, opaqueCounter1 == 256);
REPORTER_ASSERT(reporter, opaqueCounter2 == 256);
// Now ensure that we never over/underflow a byte
for (i = 0; i <= 255; i++) {
for (unsigned dst = 0; dst <= 255; dst++) {
unsigned r0 = test_srcover0(dst, i);
unsigned r1 = test_srcover1(dst, i);
unsigned r2 = test_srcover2(dst, i);
unsigned max = SkMax32(dst, i);
// ignore the known failure
if (dst != 255) {
REPORTER_ASSERT(reporter, r0 <= 255 && r0 >= max);
}
REPORTER_ASSERT(reporter, r1 <= 255 && r1 >= max);
REPORTER_ASSERT(reporter, r2 <= 255 && r2 >= max);
#if 0
// this shows where r1 (faster) differs from r2 (more exact)
if (r1 != r2) {
SkDebugf("--- dst=%d i=%d r1=%d r2=%d exact=%g\n", dst, i, r1, r2, i + dst - dst*i/255.0f);
}
#endif
}
}
}
#include "TestClassDef.h"
DEFINE_TESTCLASS("SrcOver", SrcOverTestClass, test_srcover_hack)

8
tests/TestXCode/Tests.xcodeproj/project.pbxproj
View File

@ -15,6 +15,8 @@
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0086350F0F57A3140044DA64 /* UtilsTest.cpp in Sources */ = {isa = PBXBuildFile; fileRef = 0086350E0F57A3140044DA64 /* UtilsTest.cpp */; };
009CC7840F5DAE2B002185BE /* SrcOverTest.cpp in Sources */ = {isa = PBXBuildFile; fileRef = 009CC7830F5DAE2B002185BE /* SrcOverTest.cpp */; };
009CC7880F5DAF16002185BE /* ClipCubicTest.cpp in Sources */ = {isa = PBXBuildFile; fileRef = 009CC7870F5DAF16002185BE /* ClipCubicTest.cpp */; };
00A9BF860F584CF30091AD2D /* Sk64Test.cpp in Sources */ = {isa = PBXBuildFile; fileRef = 00A9BF850F584CF30091AD2D /* Sk64Test.cpp */; };
00A9BFA30F584E150091AD2D /* StringTest.cpp in Sources */ = {isa = PBXBuildFile; fileRef = 00A9BFA20F584E150091AD2D /* StringTest.cpp */; };
00A9BFBC0F5851570091AD2D /* GeometryTest.cpp in Sources */ = {isa = PBXBuildFile; fileRef = 00A9BFBB0F5851570091AD2D /* GeometryTest.cpp */; };
@ -76,6 +78,8 @@
008634DB0F579B7A0044DA64 /* PackBitsTest.cpp */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.cpp.cpp; name = PackBitsTest.cpp; path = ../PackBitsTest.cpp; sourceTree = SOURCE_ROOT; };
008634F00F579E410044DA64 /* MatrixTest.cpp */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.cpp.cpp; name = MatrixTest.cpp; path = ../MatrixTest.cpp; sourceTree = SOURCE_ROOT; };
0086350E0F57A3140044DA64 /* UtilsTest.cpp */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.cpp.cpp; name = UtilsTest.cpp; path = ../UtilsTest.cpp; sourceTree = SOURCE_ROOT; };
009CC7830F5DAE2B002185BE /* SrcOverTest.cpp */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.cpp.cpp; name = SrcOverTest.cpp; path = ../SrcOverTest.cpp; sourceTree = SOURCE_ROOT; };
009CC7870F5DAF16002185BE /* ClipCubicTest.cpp */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.cpp.cpp; name = ClipCubicTest.cpp; path = ../ClipCubicTest.cpp; sourceTree = SOURCE_ROOT; };
00A9BF850F584CF30091AD2D /* Sk64Test.cpp */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.cpp.cpp; name = Sk64Test.cpp; path = ../Sk64Test.cpp; sourceTree = SOURCE_ROOT; };
00A9BFA20F584E150091AD2D /* StringTest.cpp */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.cpp.cpp; name = StringTest.cpp; path = ../StringTest.cpp; sourceTree = SOURCE_ROOT; };
00A9BFA60F584F200091AD2D /* TestClassDef.h */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.c.h; name = TestClassDef.h; path = ../TestClassDef.h; sourceTree = SOURCE_ROOT; };
@ -129,6 +133,7 @@
08FB7795FE84155DC02AAC07 /* Source */ = {
isa = PBXGroup;
children = (
009CC7870F5DAF16002185BE /* ClipCubicTest.cpp */,
276D93070F5B9FEA0081B3B9 /* PathTest.cpp */,
00A9BF850F584CF30091AD2D /* Sk64Test.cpp */,
00A9BFBB0F5851570091AD2D /* GeometryTest.cpp */,
@ -141,6 +146,7 @@
008634F00F579E410044DA64 /* MatrixTest.cpp */,
00A9BFA60F584F200091AD2D /* TestClassDef.h */,
008634DB0F579B7A0044DA64 /* PackBitsTest.cpp */,
009CC7830F5DAE2B002185BE /* SrcOverTest.cpp */,
);
name = Source;
sourceTree = "<group>";
@ -243,6 +249,8 @@
00A9BFA30F584E150091AD2D /* StringTest.cpp in Sources */,
00A9BFBC0F5851570091AD2D /* GeometryTest.cpp in Sources */,
276D93080F5B9FEA0081B3B9 /* PathTest.cpp in Sources */,
009CC7840F5DAE2B002185BE /* SrcOverTest.cpp in Sources */,
009CC7880F5DAF16002185BE /* ClipCubicTest.cpp in Sources */,
);
runOnlyForDeploymentPostprocessing = 0;
};

4
xcode/core/core.xcodeproj/project.pbxproj
View File

@ -126,6 +126,7 @@
005F25E70EF94F7900582A90 /* SkXfermode.cpp in Sources */ = {isa = PBXBuildFile; fileRef = 005F256E0EF94F7900582A90 /* SkXfermode.cpp */; };
005F26960EF955D400582A90 /* SkComposeShader.cpp in Sources */ = {isa = PBXBuildFile; fileRef = 005F26950EF955D400582A90 /* SkComposeShader.cpp */; };
007C786A0F3B4D5F0004B142 /* SkQuadClipper.cpp in Sources */ = {isa = PBXBuildFile; fileRef = 007C78690F3B4D5F0004B142 /* SkQuadClipper.cpp */; };
009CC7920F5DAF4B002185BE /* SkCubicClipper.cpp in Sources */ = {isa = PBXBuildFile; fileRef = 009CC7910F5DAF4B002185BE /* SkCubicClipper.cpp */; };
/* End PBXBuildFile section */
/* Begin PBXFileReference section */
@ -248,6 +249,7 @@
005F256E0EF94F7900582A90 /* SkXfermode.cpp */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.cpp.cpp; name = SkXfermode.cpp; path = ../../src/core/SkXfermode.cpp; sourceTree = SOURCE_ROOT; };
005F26950EF955D400582A90 /* SkComposeShader.cpp */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.cpp.cpp; name = SkComposeShader.cpp; path = ../../src/core/SkComposeShader.cpp; sourceTree = SOURCE_ROOT; };
007C78690F3B4D5F0004B142 /* SkQuadClipper.cpp */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.cpp.cpp; name = SkQuadClipper.cpp; path = ../../src/core/SkQuadClipper.cpp; sourceTree = SOURCE_ROOT; };
009CC7910F5DAF4B002185BE /* SkCubicClipper.cpp */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.cpp.cpp; name = SkCubicClipper.cpp; path = ../../src/core/SkCubicClipper.cpp; sourceTree = SOURCE_ROOT; };
D2AAC046055464E500DB518D /* libcore.a */ = {isa = PBXFileReference; explicitFileType = archive.ar; includeInIndex = 0; path = libcore.a; sourceTree = BUILT_PRODUCTS_DIR; };
/* End PBXFileReference section */
@ -275,6 +277,7 @@
08FB7795FE84155DC02AAC07 /* src */ = {
isa = PBXGroup;
children = (
009CC7910F5DAF4B002185BE /* SkCubicClipper.cpp */,
007C78690F3B4D5F0004B142 /* SkQuadClipper.cpp */,
002884D40EFAB8F80083E387 /* SkStream.cpp */,
002884C70EFAB8B90083E387 /* SkMMapStream.cpp */,
@ -584,6 +587,7 @@
002884C80EFAB8B90083E387 /* SkMMapStream.cpp in Sources */,
002884D50EFAB8F80083E387 /* SkStream.cpp in Sources */,
007C786A0F3B4D5F0004B142 /* SkQuadClipper.cpp in Sources */,
009CC7920F5DAF4B002185BE /* SkCubicClipper.cpp in Sources */,
);
runOnlyForDeploymentPostprocessing = 0;
};