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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);
| }
|
|
