/*
* Copyright 2013 Google Inc.
*
* Use of this source code is governed by a BSD-style license that can be
* found in the LICENSE file.
*/
#include "gm.h"
#include "SkGradientShader.h"
#include "SkBitmapAlphaThresholdShader.h"
#include "SkTArray.h"
#include "SkParsePath.h"
class BitmapAlphaThresholdGM : public skiagm::GM {
public:
BitmapAlphaThresholdGM() {
this->setBGColor(0xFF000000);
}
private:
virtual uint32_t onGetFlags() const SK_OVERRIDE {
// narrow this flags when the shader has a CPU implementation and
// when it serializes.
return
kSkipPDF_Flag |
kSkipPicture_Flag |
kSkipPipe_Flag |
kSkipPipeCrossProcess_Flag |
kSkipTiled_Flag |
kSkip565_Flag |
kSkipScaledReplay_Flag |
kSkipPDFRasterization_Flag |
kGPUOnly_Flag;
}
virtual void onOnceBeforeDraw() SK_OVERRIDE {
fBM.setConfig(SkBitmap::kARGB_8888_Config, 100, 100);
if (!fBM.allocPixels()) {
return;
}
SkCanvas canvas(fBM);
SkPoint pts[] = { {0, 0}, {SkIntToScalar(fBM.width()), SkIntToScalar(fBM.height())} };
SkColor colors[] = {0x00000000, 0xffffffff};
SkShader* grad = SkGradientShader::CreateLinear(pts, colors, NULL, 2,
SkShader::kClamp_TileMode);
SkPaint gradPaint;
gradPaint.setShader(grad)->unref();
gradPaint.setXfermodeMode(SkXfermode::kSrc_Mode);
canvas.drawPaint(gradPaint);
// Construct the region used as a mask.
SkRegion bmpBoundsClip;
bmpBoundsClip.setRect(0, 0, fBM.width(), fBM.height());
SkPath circlePath;
SkScalar radius = SkScalarSqrt(SkIntToScalar(fBM.width() * fBM.height())) / 2;
circlePath.addCircle(SkIntToScalar(fBM.width() / 2),
SkIntToScalar(fBM.height() / 2),
radius);
fMask.setPath(circlePath, bmpBoundsClip);
SkPath batPath;
SkParsePath::FromSVGString(
"M305.214,374.779c2.463,0,3.45,0.493,3.45,0.493l1.478-6.241c0,0,1.15,4.763,1.643,9.034"
"c0.493,4.271,8.048,1.479,14.454,0.164c6.405-1.314,7.72-11.662,7.72-11.662h59.294c0,0-35.807,10.841-26.772,34.656"
"c0,0-52.889-8.048-61.101,24.967h-0.001c-8.212-33.015-61.101-24.967-61.101-24.967c9.034-23.815-26.772-34.656-26.772-34.656"
"h59.294c0,0,1.314,10.348,7.719,11.662c6.406,1.314,13.962,4.106,14.454-0.164c0.493-4.271,1.643-9.034,1.643-9.034l1.479,6.241"
"c0,0,0.985-0.493,3.449-0.493H305.214L305.214,374.779z",
&batPath);
SkMatrix matrix;
matrix.setTranslate(-208, -280);
matrix.postScale(radius / 100, radius / 100);
batPath.transform(matrix, &batPath);
SkRegion batRegion;
batRegion.setPath(batPath, bmpBoundsClip);
fMask.op(batRegion, SkRegion::kDifference_Op);
}
virtual SkString onShortName() SK_OVERRIDE {
return SkString("bat");
}
virtual SkISize onISize() SK_OVERRIDE {
return SkISize::Make(518, 735);
}
virtual void onDraw(SkCanvas* canvas) SK_OVERRIDE {
SkTArray<SkMatrix> lms;
lms.push_back().reset();
lms.push_back().setScale(SK_Scalar1 / 2, SK_Scalar1);
lms.push_back().setScale(SK_Scalar1, 2 * SK_Scalar1);
lms.push_back().setRotate(-SK_Scalar1 * 30);
lms.push_back().setSkew(0, SK_Scalar1 / 5);
static const SkScalar kMargin = 5 * SK_Scalar1;
canvas->translate(kMargin, kMargin);
canvas->save();
static const U8CPU kThresholds[] = { 0x0, 0x08, 0x40, 0x80, 0xC0, 0xF0, 0xFF };
for (size_t i = 0; i < SK_ARRAY_COUNT(kThresholds); ++i) {
for (int j = 0; j < lms.count(); ++j) {
SkRect rect;
rect.fLeft = 0;
rect.fTop = 0;
rect.fRight = SkIntToScalar(fBM.width());
rect.fBottom = SkIntToScalar(fBM.height());
SkShader* thresh;
// This SkShader currently only has a GPU implementation.
if (canvas->getDevice()->accessRenderTarget()) {
thresh = SkBitmapAlphaThresholdShader::Create(fBM, fMask, kThresholds[i]);
} else {
thresh = SkShader::CreateBitmapShader(fBM, SkShader::kClamp_TileMode,
SkShader::kClamp_TileMode);
}
thresh->setLocalMatrix(lms[j]);
SkPaint paint;
paint.setShader(thresh)->unref();
canvas->drawRect(rect, paint);
canvas->translate(SkIntToScalar(fBM.width() + kMargin), 0);
}
canvas->restore();
canvas->translate(0, SkIntToScalar(fBM.height() + kMargin));
canvas->save();
}
}
SkBitmap fBM;
SkRegion fMask;
typedef skiagm::GM INHERITED;
};
//////////////////////////////////////////////////////////////////////////////
DEF_GM( return new BitmapAlphaThresholdGM(); )