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/*
* Copyright 2013 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"
#include "SkBitmap.h"
#include "SkPath.h"
#include "SkRandom.h"
#include "SkShader.h"
#include "SkSurface.h"
namespace skiagm {
/**
* Renders overlapping shapes with colorburn against a checkerboard.
*/
class DstReadShuffle : public GM {
public:
DstReadShuffle() { this->setBGColor(kBackground); }
protected:
enum ShapeType {
kCircle_ShapeType,
kRoundRect_ShapeType,
kRect_ShapeType,
kConvexPath_ShapeType,
kConcavePath_ShapeType,
kText_ShapeType,
kNumShapeTypes
};
SkString onShortName() override {
return SkString("dstreadshuffle");
}
SkISize onISize() override {
return SkISize::Make(530, 680);
}
void drawShape(SkCanvas* canvas, SkPaint* paint, ShapeType type) {
const SkRect kRect = SkRect::MakeXYWH(0, 0, 75.f, 85.f);
switch (type) {
case kCircle_ShapeType:
canvas->drawCircle(kRect.centerX(), kRect.centerY(), kRect.width() / 2.f, *paint);
break;
case kRoundRect_ShapeType:
canvas->drawRoundRect(kRect, 15.f, 15.f, *paint);
break;
case kRect_ShapeType:
canvas->drawRect(kRect, *paint);
break;
case kConvexPath_ShapeType:
if (fConvexPath.isEmpty()) {
SkPoint points[4];
kRect.toQuad(points);
fConvexPath.moveTo(points[0]);
fConvexPath.quadTo(points[1], points[2]);
fConvexPath.quadTo(points[3], points[0]);
SkASSERT(fConvexPath.isConvex());
}
canvas->drawPath(fConvexPath, *paint);
break;
case kConcavePath_ShapeType:
if (fConcavePath.isEmpty()) {
SkPoint points[5] = {{50.f, 0.f}};
SkMatrix rot;
rot.setRotate(360.f / 5, 50.f, 70.f);
for (int i = 1; i < 5; ++i) {
rot.mapPoints(points + i, points + i - 1, 1);
}
fConcavePath.moveTo(points[0]);
for (int i = 0; i < 5; ++i) {
fConcavePath.lineTo(points[(2 * i) % 5]);
}
fConcavePath.setFillType(SkPath::kEvenOdd_FillType);
SkASSERT(!fConcavePath.isConvex());
}
canvas->drawPath(fConcavePath, *paint);
break;
case kText_ShapeType: {
const char* text = "N";
paint->setTextSize(100.f);
paint->setFakeBoldText(true);
sk_tool_utils::set_portable_typeface(paint);
canvas->drawString(text, 0.f, 100.f, *paint);
}
default:
break;
}
}
static SkColor GetColor(SkRandom* random) {
SkColor color = sk_tool_utils::color_to_565(random->nextU() | 0xFF000000);
return SkColorSetA(color, 0x80);
}
static void DrawHairlines(SkCanvas* canvas) {
if (canvas->imageInfo().alphaType() == kOpaque_SkAlphaType) {
canvas->clear(kBackground);
} else {
canvas->clear(SK_ColorTRANSPARENT);
}
SkPaint hairPaint;
hairPaint.setStyle(SkPaint::kStroke_Style);
hairPaint.setStrokeWidth(0);
hairPaint.setAntiAlias(true);
static constexpr int kNumHairlines = 12;
SkPoint pts[] = {{3.f, 7.f}, {29.f, 7.f}};
SkRandom colorRandom;
SkMatrix rot;
rot.setRotate(360.f / kNumHairlines, 15.5f, 12.f);
rot.postTranslate(3.f, 0);
for (int i = 0; i < 12; ++i) {
hairPaint.setColor(GetColor(&colorRandom));
canvas->drawLine(pts[0].fX, pts[0].fY, pts[1].fX, pts[1].fY, hairPaint);
rot.mapPoints(pts, 2);
}
}
void onDraw(SkCanvas* canvas) override {
SkScalar y = 5;
for (int i = 0; i < kNumShapeTypes; i++) {
SkRandom colorRandom;
ShapeType shapeType = static_cast<ShapeType>(i);
SkScalar x = 5;
for (int r = 0; r <= 15; r++) {
SkPaint p;
p.setAntiAlias(true);
p.setColor(GetColor(&colorRandom));
// In order to get some op combining on the GPU backend we do 2 src over
// for each xfer mode which requires a dst read
p.setBlendMode(r % 3 == 0 ? SkBlendMode::kColorBurn : SkBlendMode::kSrcOver);
canvas->save();
canvas->translate(x, y);
this->drawShape(canvas, &p, shapeType);
canvas->restore();
x += 15;
}
y += 110;
}
// Draw hairlines to a surface and then draw that to the main canvas with a zoom so that
// it is easier to see how they blend.
SkImageInfo info;
// Recording canvases don't have a color type.
if (SkColorType::kUnknown_SkColorType == canvas->imageInfo().colorType()) {
info = SkImageInfo::MakeN32Premul(35, 35);
} else {
info = SkImageInfo::Make(35, 35,
canvas->imageInfo().colorType(),
canvas->imageInfo().alphaType(),
canvas->imageInfo().refColorSpace());
}
auto surf = canvas->makeSurface(info);
if (!surf) {
// Fall back to raster. Raster supports only one of the 8 bit per-channel RGBA or BGRA
// formats. This fall back happens when running with --preAbandonGpuContext.
if ((info.colorType() == kRGBA_8888_SkColorType ||
info.colorType() == kBGRA_8888_SkColorType) &&
info.colorType() != kN32_SkColorType) {
info = SkImageInfo::Make(35, 35,
kN32_SkColorType,
canvas->imageInfo().alphaType(),
canvas->imageInfo().refColorSpace());
}
surf = SkSurface::MakeRaster(info);
}
canvas->scale(5.f, 5.f);
canvas->translate(67.f, 10.f);
DrawHairlines(surf->getCanvas());
canvas->drawImage(surf->makeImageSnapshot(), 0.f, 0.f);
}
private:
static constexpr SkColor kBackground = SK_ColorLTGRAY;
SkPath fConcavePath;
SkPath fConvexPath;
typedef GM INHERITED;
};
//////////////////////////////////////////////////////////////////////////////
static GM* MyFactory(void*) { return new DstReadShuffle; }
static GMRegistry reg(MyFactory);
}
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