blob: 9cb0419e3b66ba50bb42ce77f4a7d30e1cc118ce [file] [log] [blame]
/*
* 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/DecodeUtils.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(ToolUtils::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