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/*
* Copyright 2017 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 "SkColorFilter.h"
#include "SkImage.h"
#include "SkMaskFilter.h"
#include "SkShader.h"
static SkBitmap make_alpha_image(int w, int h) {
SkBitmap bm;
bm.allocPixels(SkImageInfo::MakeA8(w, h));
bm.eraseARGB(10, 0, 0 , 0);
for (int y = 0; y < bm.height(); ++y) {
for (int x = y; x < bm.width(); ++x) {
*bm.getAddr8(x, y) = 0xFF;
}
}
bm.setImmutable();
return bm;
}
static sk_sp<SkColorFilter> make_color_filter() {
SkScalar colorMatrix[20] = {
1, 0, 0, 0, 0,
0, 1, 0, 0, 0,
0, 0, 0.5, 0.5, 0,
0, 0, 0.5, 0.5, 0}; // mix G and A.
return SkColorFilter::MakeMatrixFilterRowMajor255(colorMatrix);
}
DEF_SIMPLE_GM(alpha_image, canvas, 256, 256) {
auto image = SkImage::MakeFromBitmap(make_alpha_image(96, 96));
SkPaint paint;
paint.setColorFilter(make_color_filter());
paint.setMaskFilter(SkMaskFilter::MakeBlur(kNormal_SkBlurStyle, 10.0f));
canvas->drawImage(image.get(), 16, 16, &paint);
paint.setColorFilter(nullptr);
paint.setShader(SkShader::MakeColorShader(SK_ColorCYAN));
canvas->drawImage(image.get(), 144, 16, &paint);
paint.setColorFilter(make_color_filter());
canvas->drawImage(image.get(), 16, 144, &paint);
paint.setMaskFilter(nullptr);
canvas->drawImage(image.get(), 144, 144, &paint);
}
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