blob: 3224cc883a0ae3b52c29bcf3bf541b7ecb6cbc47 [file] [log] [blame]
/*
* Copyright 2014 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/SkCanvas.h"
#include "include/core/SkColor.h"
#include "include/core/SkImageInfo.h"
#include "include/core/SkPaint.h"
#include "include/core/SkRefCnt.h"
#include "include/core/SkShader.h"
#include "include/core/SkSize.h"
#include "include/core/SkString.h"
#include "include/core/SkSurface.h"
#include "include/core/SkTypes.h"
#include "include/gpu/GrDirectContext.h"
#include "include/gpu/GrRecordingContext.h"
#include "include/gpu/ganesh/SkSurfaceGanesh.h"
#include "src/base/SkRandom.h"
#include "tools/ToolUtils.h"
#if defined(SK_GRAPHITE)
#include "include/gpu/graphite/Surface.h"
#endif
namespace skiagm {
/*
* This GM exercises SkCanvas::discard() by creating an offscreen SkSurface and repeatedly
* discarding it, drawing to it, and then drawing it to the main canvas.
*/
class DiscardGM : public GM {
public:
DiscardGM() {}
protected:
SkString onShortName() override {
return SkString("discard");
}
SkISize onISize() override {
return SkISize::Make(100, 100);
}
DrawResult onDraw(SkCanvas* canvas, SkString* errorMsg) override {
SkISize size = this->getISize();
size.fWidth /= 10;
size.fHeight /= 10;
SkImageInfo info = SkImageInfo::MakeN32Premul(size);
sk_sp<SkSurface> surface;
auto dContext = GrAsDirectContext(canvas->recordingContext());
if (dContext && !dContext->abandoned()) {
surface = SkSurfaces::RenderTarget(dContext, skgpu::Budgeted::kNo, info);
}
#if defined(SK_GRAPHITE)
auto recorder = canvas->recorder();
if (recorder) {
surface = SkSurfaces::RenderTarget(recorder, info);
}
#endif
if (!surface) {
surface = SkSurfaces::Raster(info);
}
if (!surface) {
*errorMsg = "Could not create surface.";
return DrawResult::kFail;
}
canvas->clear(SK_ColorBLACK);
SkRandom rand;
for (int x = 0; x < 10; ++x) {
for (int y = 0; y < 10; ++y) {
surface->getCanvas()->discard();
// Make something that isn't too close to the background color, black.
SkColor color = ToolUtils::color_to_565(rand.nextU() | 0xFF404040);
switch (rand.nextULessThan(3)) {
case 0:
surface->getCanvas()->drawColor(color);
break;
case 1:
surface->getCanvas()->clear(color);
break;
case 2:
SkPaint paint;
paint.setShader(SkShaders::Color(color));
surface->getCanvas()->drawPaint(paint);
break;
}
surface->draw(canvas, 10.f*x, 10.f*y);
}
}
surface->getCanvas()->discard();
return DrawResult::kOk;
}
};
//////////////////////////////////////////////////////////////////////////////
DEF_GM(return new DiscardGM;)
} // namespace skiagm