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add tests for extractAlpha

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git-svn-id: http://skia.googlecode.com/svn/trunk@346 2bbb7eff-a529-9590-31e7-b0007b416f81
This commit is contained in:
reed@android.com 2009-08-31 21:04:24 +00:00
parent 289e4fca43
commit 113244f1e1
2 changed files with 97 additions and 0 deletions
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93
samplecode/SampleExtractAlpha.cpp Normal file
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@ -0,0 +1,93 @@
#include "SampleCode.h"
#include "SkColorPriv.h"
#include "SkGradientShader.h"
#include "SkView.h"
#include "SkCanvas.h"
#include "SkUtils.h"
static SkBitmap make_bitmap() {
SkBitmap bm;
SkColorTable* ctable = new SkColorTable(256);
SkPMColor* c = ctable->lockColors();
for (int i = 0; i < 256; i++) {
c[i] = SkPackARGB32(255 - i, 0, 0, 0);
}
ctable->unlockColors(true);
bm.setConfig(SkBitmap::kIndex8_Config, 256, 256);
bm.allocPixels(ctable);
ctable->unref();
bm.lockPixels();
const float cx = bm.width() * 0.5f;
const float cy = bm.height() * 0.5f;
for (int y = 0; y < bm.height(); y++) {
float dy = y - cy;
dy *= dy;
uint8_t* p = bm.getAddr8(0, y);
for (int x = 0; x < 256; x++) {
float dx = x - cx;
dx *= dx;
float d = (dx + dy) / (cx/2);
int id = (int)d;
if (id > 255) {
id = 255;
}
p[x] = id;
}
}
bm.unlockPixels();
return bm;
}
class ExtractAlphaView : public SkView {
SkBitmap fBM8;
SkBitmap fBM32;
SkBitmap fBM4;
public:
ExtractAlphaView() {
fBM8 = make_bitmap();
fBM8.copyTo(&fBM32, SkBitmap::kARGB_8888_Config);
fBM8.copyTo(&fBM4, SkBitmap::kARGB_4444_Config);
}
protected:
// overrides from SkEventSink
virtual bool onQuery(SkEvent* evt) {
if (SampleCode::TitleQ(*evt)) {
SampleCode::TitleR(evt, "DitherBitmap");
return true;
}
return this->INHERITED::onQuery(evt);
}
void drawBG(SkCanvas* canvas) {
canvas->drawColor(0xFFDDDDDD);
}
virtual void onDraw(SkCanvas* canvas) {
drawBG(canvas);
const SkBitmap* srcBM[] = { &fBM8, &fBM32, &fBM4 };
SkPaint paint;
paint.setColor(SK_ColorRED);
for (int i = 0; i < 3; i++) {
canvas->drawBitmap(*srcBM[i], 0, 0, &paint);
SkBitmap tmp;
srcBM[i]->extractAlpha(&tmp);
canvas->drawBitmap(tmp, 0, SkIntToScalar(tmp.height() + 10), &paint);
canvas->translate(SkIntToScalar(tmp.width() + 10), 0);
}
}
private:
typedef SkView INHERITED;
};
//////////////////////////////////////////////////////////////////////////////
static SkView* MyFactory() { return new ExtractAlphaView; }
static SkViewRegister reg(MyFactory);

4
xcode/sampleapp/SampleApp.xcodeproj/project.pbxproj
View File

@ -62,6 +62,7 @@
007A7CBF0F01658C00A2D6EE /* SampleTypeface.cpp in Sources */ = {isa = PBXBuildFile; fileRef = 007A7CB00F01658C00A2D6EE /* SampleTypeface.cpp */; };
007A7CC00F01658C00A2D6EE /* SampleVertices.cpp in Sources */ = {isa = PBXBuildFile; fileRef = 007A7CB10F01658C00A2D6EE /* SampleVertices.cpp */; };
007C785E0F3B4C230004B142 /* SamplePathClip.cpp in Sources */ = {isa = PBXBuildFile; fileRef = 007C785D0F3B4C230004B142 /* SamplePathClip.cpp */; };
00840B75104C69F5005B3EDC /* SampleExtractAlpha.cpp in Sources */ = {isa = PBXBuildFile; fileRef = 00840B74104C69F5005B3EDC /* SampleExtractAlpha.cpp */; };
0088C1160FEC311C00CE52F5 /* SampleXfermodes.cpp in Sources */ = {isa = PBXBuildFile; fileRef = 007A7CB20F01658C00A2D6EE /* SampleXfermodes.cpp */; };
008C4D980F77DAEE0056981C /* SampleHairline.cpp in Sources */ = {isa = PBXBuildFile; fileRef = 008C4D970F77DAEE0056981C /* SampleHairline.cpp */; };
009490320FB0A5B90063C792 /* SampleLayerMask.cpp in Sources */ = {isa = PBXBuildFile; fileRef = 009490310FB0A5B90063C792 /* SampleLayerMask.cpp */; };
@ -195,6 +196,7 @@
007A7CB10F01658C00A2D6EE /* SampleVertices.cpp */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.cpp.cpp; name = SampleVertices.cpp; path = ../../samplecode/SampleVertices.cpp; sourceTree = SOURCE_ROOT; };
007A7CB20F01658C00A2D6EE /* SampleXfermodes.cpp */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.cpp.cpp; name = SampleXfermodes.cpp; path = ../../samplecode/SampleXfermodes.cpp; sourceTree = SOURCE_ROOT; };
007C785D0F3B4C230004B142 /* SamplePathClip.cpp */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.cpp.cpp; name = SamplePathClip.cpp; path = ../../samplecode/SamplePathClip.cpp; sourceTree = SOURCE_ROOT; };
00840B74104C69F5005B3EDC /* SampleExtractAlpha.cpp */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.cpp.cpp; name = SampleExtractAlpha.cpp; path = ../../samplecode/SampleExtractAlpha.cpp; sourceTree = SOURCE_ROOT; };
008C4D970F77DAEE0056981C /* SampleHairline.cpp */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.cpp.cpp; name = SampleHairline.cpp; path = ../../samplecode/SampleHairline.cpp; sourceTree = SOURCE_ROOT; };
009490310FB0A5B90063C792 /* SampleLayerMask.cpp */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.cpp.cpp; name = SampleLayerMask.cpp; path = ../../samplecode/SampleLayerMask.cpp; sourceTree = SOURCE_ROOT; };
009CC9180F65918A002185BE /* SampleFontScalerTest.cpp */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.cpp.cpp; name = SampleFontScalerTest.cpp; path = ../../samplecode/SampleFontScalerTest.cpp; sourceTree = SOURCE_ROOT; };
@ -286,6 +288,7 @@
0041CE260F00A12400695E8C /* SampleEncode.cpp */,
0041CE270F00A12400695E8C /* SampleFillType.cpp */,
00AF9B17103CD5EB00CBBCB3 /* SampleDitherBitmap.cpp */,
00840B74104C69F5005B3EDC /* SampleExtractAlpha.cpp */,
0041CE280F00A12400695E8C /* SampleFilter.cpp */,
0041CE290F00A12400695E8C /* SampleFilter2.cpp */,
0041CE2A0F00A12400695E8C /* SampleFontCache.cpp */,
@ -591,6 +594,7 @@
001B871E1042184D00C84ED4 /* Forth.cpp in Sources */,
00BB289B104781D00057BF7E /* SampleForth.cpp in Sources */,
00ED55F3104A10EB00F51FF8 /* StdWords.cpp in Sources */,
00840B75104C69F5005B3EDC /* SampleExtractAlpha.cpp in Sources */,
);
runOnlyForDeploymentPostprocessing = 0;
};