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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 "SkBitmap.h"
#include "SkPath.h"
#include "SkRandom.h"
#include "SkShader.h"
#include "SkXfermode.h"
namespace skiagm {
/**
* Renders overlapping shapes with colorburn against a checkerboard.
*/
class DstReadShuffle : public GM {
public:
DstReadShuffle() {
this->setBGColor(SkColorSetARGB(0xff, 0xff, 0, 0xff));
}
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(kWidth, kHeight);
}
void drawShape(SkCanvas* canvas,
SkPaint* paint,
ShapeType type) {
const SkRect kRect = SkRect::MakeXYWH(SkIntToScalar(-50), SkIntToScalar(-50),
SkIntToScalar(75), SkIntToScalar(105));
switch (type) {
case kCircle_ShapeType:
canvas->drawCircle(0, 0, 50, *paint);
break;
case kRoundRect_ShapeType:
canvas->drawRoundRect(kRect, SkIntToScalar(10), SkIntToScalar(20), *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] = {{0, SkIntToScalar(-50)} };
SkMatrix rot;
rot.setRotate(SkIntToScalar(360) / 5);
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 = "Hello!";
paint->setTextSize(30);
sk_tool_utils::set_portable_typeface(paint);
canvas->drawText(text, strlen(text), 0, 0, *paint);
}
default:
break;
}
}
static SkColor GetColor(SkRandom* random, int i, int nextColor) {
static SkColor colors[] = { SK_ColorRED,
sk_tool_utils::color_to_565(0xFFFF7F00), // Orange
SK_ColorYELLOW,
SK_ColorGREEN,
SK_ColorBLUE,
sk_tool_utils::color_to_565(0xFF4B0082), // indigo
sk_tool_utils::color_to_565(0xFF7F00FF) }; // violet
SkColor color;
int index = nextColor % SK_ARRAY_COUNT(colors);
switch (i) {
case 0:
color = SK_ColorTRANSPARENT;
break;
case 1:
color = SkColorSetARGB(0xff,
SkColorGetR(colors[index]),
SkColorGetG(colors[index]),
SkColorGetB(colors[index]));
break;
default:
uint8_t alpha = 0x80;
color = SkColorSetARGB(alpha,
SkColorGetR(colors[index]),
SkColorGetG(colors[index]),
SkColorGetB(colors[index]));
break;
}
return color;
}
static void SetStyle(SkPaint* p, int style, int width) {
switch (style) {
case 0:
p->setStyle(SkPaint::kStroke_Style);
p->setStrokeWidth((SkScalar)width);
break;
case 1:
p->setStyle(SkPaint::kStrokeAndFill_Style);
p->setStrokeWidth((SkScalar)width);
break;
default:
p->setStyle(SkPaint::kFill_Style);
break;
}
}
void onDraw(SkCanvas* canvas) override {
SkRandom random;
SkScalar y = 100;
for (int i = 0; i < kNumShapeTypes; i++) {
ShapeType shapeType = static_cast<ShapeType>(i);
SkScalar x = 25;
for (int style = 0; style < 3; style++) {
for (int width = 0; width <= 1; width++) {
for (int alpha = 0; alpha <= 2; alpha++) {
for (int r = 0; r <= 5; r++) {
SkColor color = GetColor(&random, alpha, style + width + alpha + r);
SkPaint p;
p.setAntiAlias(true);
p.setColor(color);
// In order to get some batching on the GPU backend we do 2 src over for
// each xfer mode which requires a dst read
p.setXfermodeMode(r % 3 == 0 ? SkXfermode::kLighten_Mode :
SkXfermode::kSrcOver_Mode);
SetStyle(&p, style, width);
canvas->save();
canvas->translate(x, y);
canvas->rotate((SkScalar)(r < 3 ? 10 : 0));
this->drawShape(canvas, &p, shapeType);
canvas->restore();
x += 8;
}
}
}
}
y += 50;
}
}
private:
enum {
kNumShapes = 100,
};
SkAutoTUnref<SkShader> fBG;
SkPath fConcavePath;
SkPath fConvexPath;
static constexpr int kWidth = 900;
static constexpr int kHeight = 400;
typedef GM INHERITED;
};
//////////////////////////////////////////////////////////////////////////////
static GM* MyFactory(void*) { return new DstReadShuffle; }
static GMRegistry reg(MyFactory);
}
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