UnpremulGPU.cpp File Reference

#include "tools/fiddle/examples.h"

Go to the source code of this file.

Functions
	REG_FIDDLE (UnpremulGPU, 256, 256, false, 6)

Function Documentation

REG_FIDDLE()

REG_FIDDLE	(	UnpremulGPU	,
		256	,
		256	,
		false	,
		6
	)

Definition at line 4 of file UnpremulGPU.cpp.

                                            {
void draw(SkCanvas* canvas) {
    canvas->clear(0xffa020a0);
    SkImageInfo premulInfo = SkImageInfo::MakeS32(10, 10, kPremul_SkAlphaType);
    SkBitmap premulBitmap;
    premulBitmap.allocPixels(premulInfo);
    for (int y = 0; y < 10; y++) {
        for (int x = 0; x < 10; x++) {
            *(premulBitmap.getAddr32(x, y)) = 0x80808080;
        }
    }
    sk_sp<SkImage> premulImage = premulBitmap.asImage();
 
    SkImageInfo unpremulInfo = premulInfo.makeAlphaType(kUnpremul_SkAlphaType);
    SkBitmap unpremulBitmap;
    unpremulBitmap.allocPixels(unpremulInfo);
    for (int y = 0; y < 10; y++) {
        for (int x = 0; x < 10; x++) {
            *(unpremulBitmap.getAddr32(x, y)) = 0x80FFFFFF;
        }
    }
    sk_sp<SkImage> unpremulImage = unpremulBitmap.asImage();
 
    SkPaint paint;
    const SkTileMode tile = SkTileMode::kRepeat;
    paint.setShader(premulImage->makeShader(tile, tile, SkSamplingOptions()));
    canvas->drawCircle(10.0f, 10.0f, 10.0f, paint);
 
    paint.setShader(unpremulImage->makeShader(tile, tile, SkSamplingOptions()));
    canvas->drawCircle(10.0f, 35.0f, 10.0f, paint);
}
}  // END FIDDLE