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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 "SkTypes.h"
#include "SkCanvas.h"
#include "SkSurface.h"
#if SK_SUPPORT_GPU
#include "GrContext.h"
#include "GrTest.h"
#include "Test.h"
static SkBitmap read_pixels(sk_sp<SkSurface> surface) {
SkBitmap bmp;
bmp.allocN32Pixels(surface->width(), surface->height());
if (!surface->readPixels(bmp, 0, 0)) {
SkDebugf("readPixels failed\n");
}
return bmp;
}
static sk_sp<SkSurface> make_surface(GrContext* context) {
SkImageInfo info = SkImageInfo::Make(50, 50, kRGBA_8888_SkColorType, kPremul_SkAlphaType);
return SkSurface::MakeRenderTarget(context, SkBudgeted::kNo, info, 4,
kBottomLeft_GrSurfaceOrigin, nullptr);
}
// Tests that readPixels returns up-to-date results. Demonstrates a bug on Galaxy S6
// (Mali T760), in MSAA mode.
DEF_GPUTEST_FOR_RENDERING_CONTEXTS(skbug6653, reporter, ctxInfo) {
GrContext* ctx = ctxInfo.grContext();
SkRect rect = SkRect::MakeWH(50, 50);
SkPaint paint;
paint.setColor(SK_ColorWHITE);
paint.setStrokeWidth(5);
paint.setStyle(SkPaint::kStroke_Style);
// The one device that fails this test (Galaxy S6) does so in a flaky fashion. Trying many
// times makes it more likely to fail. Also, interacting with the phone (eg swiping between
// different home screens) while the test is running makes it fail close to 100%.
static const int kNumIterations = 50;
for (int i = 0; i < kNumIterations; ++i) {
auto s0 = make_surface(ctx);
if (!s0) {
// MSAA may not be supported
return;
}
auto s1 = make_surface(ctx);
s1->getCanvas()->clear(SK_ColorBLACK);
s1->getCanvas()->drawOval(rect, paint);
SkBitmap b1 = read_pixels(s1);
s1 = nullptr;
// The bug requires that all three of the following surfaces are cleared to the same color
auto s2 = make_surface(ctx);
s2->getCanvas()->clear(SK_ColorBLUE);
SkBitmap b2 = read_pixels(s2);
s2 = nullptr;
auto s3 = make_surface(ctx);
s3->getCanvas()->clear(SK_ColorBLUE);
SkBitmap b3 = read_pixels(s3);
s0->getCanvas()->drawBitmap(b3, 0, 0);
s3 = nullptr;
auto s4 = make_surface(ctx);
s4->getCanvas()->clear(SK_ColorBLUE);
s4->getCanvas()->drawOval(rect, paint);
// When this fails, b4 will "succeed", but return an empty bitmap (containing just the
// clear color). Regardless, b5 will contain the oval that was just drawn, so diffing the
// two bitmaps tests for the failure case.
SkBitmap b4 = read_pixels(s4);
SkBitmap b5 = read_pixels(s4);
bool match = true;
for (int y = 0; y < b4.height() && match; ++y) {
for (int x = 0; x < b4.width() && match; ++x) {
uint32_t pixelA = *b4.getAddr32(x, y);
uint32_t pixelB = *b5.getAddr32(x, y);
if (pixelA != pixelB) {
match = false;
}
}
}
REPORTER_ASSERT(reporter, match);
}
}
#endif
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