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/*
* Copyright 2014 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 "SkColor.h"
#include "SkMatrixImageFilter.h"
namespace skiagm {
class MatrixImageFilterGM : public GM {
public:
MatrixImageFilterGM() {
this->setBGColor(0x00000000);
}
protected:
virtual SkString onShortName() {
return SkString("matriximagefilter");
}
void draw(SkCanvas* canvas, const SkRect& rect, const SkBitmap& bitmap,
const SkMatrix& matrix, SkPaint::FilterLevel filterLevel) {
SkAutoTUnref<SkImageFilter> imageFilter(
SkMatrixImageFilter::Create(matrix, filterLevel));
SkPaint paint;
paint.setImageFilter(imageFilter.get());
canvas->saveLayer(&rect, &paint);
canvas->drawBitmap(bitmap, 0, 0);
canvas->restore();
}
virtual SkISize onISize() {
return make_isize(420, 100);
}
void make_checkerboard(SkBitmap* bitmap) {
bitmap->allocN32Pixels(64, 64);
SkCanvas canvas(*bitmap);
SkPaint darkPaint;
darkPaint.setColor(0xFF404040);
SkPaint lightPaint;
lightPaint.setColor(0xFFA0A0A0);
for (int y = 0; y < 64; y += 32) {
for (int x = 0; x < 64; x += 32) {
canvas.save();
canvas.translate(SkIntToScalar(x), SkIntToScalar(y));
canvas.drawRect(SkRect::MakeXYWH(0, 0, 16, 16), darkPaint);
canvas.drawRect(SkRect::MakeXYWH(16, 0, 16, 16), lightPaint);
canvas.drawRect(SkRect::MakeXYWH(0, 16, 16, 16), lightPaint);
canvas.drawRect(SkRect::MakeXYWH(16, 16, 16, 16), darkPaint);
canvas.restore();
}
}
}
virtual void onDraw(SkCanvas* canvas) {
canvas->clear(0x00000000);
SkPaint paint;
SkMatrix matrix;
SkScalar margin = SkIntToScalar(10);
matrix.setSkew(SkDoubleToScalar(0.5), SkDoubleToScalar(0.2));
SkRect srcBounds;
SkBitmap checkerboard;
make_checkerboard(&checkerboard);
checkerboard.getBounds(&srcBounds);
// Outer paint does no filtering; leave it all for the filter
paint.setFilterLevel(SkPaint::kNone_FilterLevel);
SkRect srcRect = SkRect::MakeWH(96, 96);
canvas->translate(margin, margin);
draw(canvas, srcRect, checkerboard, matrix, SkPaint::kNone_FilterLevel);
canvas->translate(srcRect.width() + margin, 0);
draw(canvas, srcRect, checkerboard, matrix, SkPaint::kLow_FilterLevel);
canvas->translate(srcRect.width() + margin, 0);
draw(canvas, srcRect, checkerboard, matrix, SkPaint::kMedium_FilterLevel);
canvas->translate(srcRect.width() + margin, 0);
draw(canvas, srcRect, checkerboard, matrix, SkPaint::kHigh_FilterLevel);
}
private:
typedef GM INHERITED;
};
//////////////////////////////////////////////////////////////////////////////
static GM* MyFactory(void*) { return new MatrixImageFilterGM; }
static GMRegistry reg(MyFactory);
}
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