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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 "sk_tool_utils.h"
static const uint32_t SkCanvas_kDontClipToLayer_PrivateSaveLayerFlag = 1U << 31;
// This GM tests out the deprecated Android-specific unclipped saveLayer "feature".
// In particular, it attempts to compare the performance of unclipped saveLayers with alternatives.
static void save_layer_unclipped(SkCanvas* canvas,
SkScalar l, SkScalar t, SkScalar r, SkScalar b) {
SkRect rect = SkRect::MakeLTRB(l, t, r, b);
canvas->saveLayer({ &rect, nullptr, nullptr, SkCanvas_kDontClipToLayer_PrivateSaveLayerFlag });
}
static void do_draw(SkCanvas* canvas) {
SkPaint paint;
SkRandom rand;
for (int i = 0; i < 20; ++i) {
paint.setColor(sk_tool_utils::color_to_565(rand.nextU() | (0xFF << 24)));
canvas->drawRect({ 15, 15, 290, 40 }, paint);
canvas->translate(0, 30);
}
}
class UnclippedSaveLayerGM : public skiagm::GM {
public:
enum class Mode {
kClipped,
kUnclipped
};
UnclippedSaveLayerGM(Mode mode) : fMode(mode) { this->setBGColor(SK_ColorWHITE); }
protected:
bool runAsBench() const override { return true; }
SkString onShortName() override {
if (Mode::kClipped == fMode) {
return SkString("savelayer_unclipped");
} else {
SkASSERT(Mode::kUnclipped == fMode);
return SkString("savelayer_clipped");
}
}
SkISize onISize() override { return SkISize::Make(320, 640); }
void onDraw(SkCanvas* canvas) override {
const SkScalar L = 10;
const SkScalar T = 10;
const SkScalar R = 310;
const SkScalar B = 630;
canvas->clipRect({ L, T, R, B });
for (int i = 0; i < 100; ++i) {
SkAutoCanvasRestore acr(canvas, true);
if (Mode::kClipped == fMode) {
save_layer_unclipped(canvas, L, T, R, T + 20);
save_layer_unclipped(canvas, L, B - 20, R, B);
} else {
SkASSERT(Mode::kUnclipped == fMode);
canvas->saveLayer({ L, T, R, B }, nullptr);
}
do_draw(canvas);
}
}
private:
Mode fMode;
typedef skiagm::GM INHERITED;
};
DEF_GM(return new UnclippedSaveLayerGM(UnclippedSaveLayerGM::Mode::kClipped);)
DEF_GM(return new UnclippedSaveLayerGM(UnclippedSaveLayerGM::Mode::kUnclipped);)
DEF_SIMPLE_GM(picture_savelayer, canvas, 320, 640) {
SkPaint paint1, paint2, paint3;
paint1.setAlpha(0x7f);
paint2.setAlpha(0x3f);
paint3.setColor(0xFFFF0000);
SkRect rect1{40, 5, 80, 70}, rect2{5, 40, 70, 80}, rect3{10, 10, 70, 70};
// In the future, we might also test the clipped case by allowing i = 0
for(int i = 1; i < 2; ++i) {
canvas->translate(100 * i, 0);
auto flag = i ? SkCanvas_kDontClipToLayer_PrivateSaveLayerFlag : 0;
canvas->saveLayer({ &rect1, &paint1, nullptr, flag});
canvas->saveLayer({ &rect2, &paint2, nullptr, flag});
canvas->drawRect(rect3, paint3);
canvas->restore();
canvas->restore();
}
};
#include "Resources.h"
// Test kInitWithPrevious_SaveLayerFlag by drawing an image, save a layer with the flag, which
// should seed the layer with the image (from below). Then we punch a hole in the layer and
// restore with kPlus mode, which should show the mandrill super-bright on the outside, but
// normal where we punched the hole.
DEF_SIMPLE_GM(savelayer_initfromprev, canvas, 256, 256) {
canvas->drawImage(GetResourceAsImage("mandrill_256.png"), 0, 0, nullptr);
SkCanvas::SaveLayerRec rec;
SkPaint paint;
paint.setBlendMode(SkBlendMode::kPlus);
rec.fSaveLayerFlags = SkCanvas::kInitWithPrevious_SaveLayerFlag;
rec.fPaint = &paint;
canvas->saveLayer(rec);
paint.setBlendMode(SkBlendMode::kClear);
canvas->drawCircle(128, 128, 96, paint);
canvas->restore();
};
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