| /* |
| * 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/gm.h" |
| #include "include/core/SkBitmap.h" |
| #include "include/core/SkBlurTypes.h" |
| #include "include/core/SkCanvas.h" |
| #include "include/core/SkColor.h" |
| #include "include/core/SkColorFilter.h" |
| #include "include/core/SkImage.h" |
| #include "include/core/SkImageInfo.h" |
| #include "include/core/SkMaskFilter.h" |
| #include "include/core/SkPaint.h" |
| #include "include/core/SkRefCnt.h" |
| #include "include/core/SkShader.h" |
| #include "tools/Resources.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() { |
| float 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 SkColorFilters::Matrix(colorMatrix); |
| } |
| |
| DEF_SIMPLE_GM(alpha_image, canvas, 256, 256) { |
| auto image = make_alpha_image(96, 96).asImage(); |
| SkPaint paint; |
| |
| paint.setColorFilter(make_color_filter()); |
| paint.setMaskFilter(SkMaskFilter::MakeBlur(kNormal_SkBlurStyle, 10.0f)); |
| canvas->drawImage(image.get(), 16, 16, SkSamplingOptions(), &paint); |
| |
| paint.setColorFilter(nullptr); |
| paint.setShader(SkShaders::Color(SK_ColorCYAN)); |
| canvas->drawImage(image.get(), 144, 16, SkSamplingOptions(), &paint); |
| |
| paint.setColorFilter(make_color_filter()); |
| canvas->drawImage(image.get(), 16, 144, SkSamplingOptions(), &paint); |
| |
| paint.setMaskFilter(nullptr); |
| canvas->drawImage(image.get(), 144, 144, SkSamplingOptions(), &paint); |
| } |
| |
| // Created to demonstrate skbug.com/10556 - GPU backend was failing to apply paint alpha to |
| // alpha-only image shaders. The two boxes should look the same. |
| DEF_SIMPLE_GM(alpha_image_alpha_tint, canvas, 152, 80) { |
| canvas->clear(SK_ColorGRAY); |
| |
| SkBitmap bm; |
| bm.allocPixels(SkImageInfo::MakeA8(64, 64)); |
| for (int y = 0; y < bm.height(); ++y) { |
| for (int x = 0; x < bm.width(); ++x) { |
| *bm.getAddr8(x, y) = y * 4; |
| } |
| } |
| bm.setImmutable(); |
| auto image = bm.asImage(); |
| |
| SkPaint paint; |
| paint.setColor4f({ 0, 1, 0, 0.5f }); |
| |
| canvas->translate(8, 8); |
| canvas->drawImage(image.get(), 0, 0, SkSamplingOptions(), &paint); |
| |
| canvas->translate(72, 0); |
| paint.setShader(image->makeShader(SkSamplingOptions())); |
| canvas->drawRect({ 0, 0, 64, 64 }, paint); |
| } |
| |
| #if defined(SK_SUPPORT_LEGACY_ALPHA_BITMAP_AS_COVERAGE) |
| // For a long time, the CPU backend treated A8 bitmaps as coverage, rather than alpha. This was |
| // inconsistent with the GPU backend (skbug.com/9692). When this was fixed, it altered behavior |
| // for some Android apps (b/231400686). This GM verifies that our Android framework workaround |
| // produces the old result (mandrill with a round-rect border). |
| DEF_SIMPLE_GM(alpha_bitmap_is_coverage_ANDROID, canvas, 128, 128) { |
| SkBitmap maskBitmap; |
| maskBitmap.allocPixels(SkImageInfo::MakeA8(128, 128)); |
| { |
| SkCanvas maskCanvas(maskBitmap); |
| maskCanvas.clear(SK_ColorWHITE); |
| |
| SkPaint maskPaint; |
| maskPaint.setAntiAlias(true); |
| maskPaint.setColor(SK_ColorWHITE); |
| maskPaint.setBlendMode(SkBlendMode::kClear); |
| maskCanvas.drawRoundRect({0, 0, 128, 128}, 16, 16, maskPaint); |
| } |
| |
| SkBitmap offscreenBitmap; |
| offscreenBitmap.allocN32Pixels(128, 128); |
| { |
| SkCanvas offscreenCanvas(offscreenBitmap); |
| offscreenCanvas.drawImage(GetResourceAsImage("images/mandrill_128.png"), 0, 0); |
| |
| SkPaint clearPaint; |
| clearPaint.setAntiAlias(true); |
| clearPaint.setBlendMode(SkBlendMode::kClear); |
| // At tip-of-tree (or at any time on the GPU backend), this draw produces full coverage, |
| // completely erasing the mandrill. With the workaround enabled, the alpha border is treated |
| // as coverage, so we only apply kClear to those pixels, just erasing the outer border. |
| offscreenCanvas.drawImage(maskBitmap.asImage(), 0, 0, SkSamplingOptions{}, &clearPaint); |
| } |
| |
| canvas->drawImage(offscreenBitmap.asImage(), 0, 0); |
| } |
| #endif |