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/*
* Copyright 2011 Google Inc.
*
* Use of this source code is governed by a BSD-style license that can be
* found in the LICENSE file.
*/
#include "SampleCode.h"
#include "SkView.h"
#include "SkCanvas.h"
#include "SkGradientShader.h"
#include "SkMakeUnique.h"
static sk_sp<SkShader> make_grad(SkScalar w, SkScalar h) {
SkColor colors[] = { 0xFF000000, 0xFF333333 };
SkPoint pts[] = { { 0, 0 }, { w, h } };
return SkGradientShader::MakeLinear(pts, colors, nullptr, 2, SkShader::kClamp_TileMode);
}
class BigGradientView : public SampleView {
public:
BigGradientView() {}
protected:
bool onQuery(SkEvent* evt) override {
if (SampleCode::TitleQ(*evt)) {
SampleCode::TitleR(evt, "BigGradient");
return true;
}
return this->INHERITED::onQuery(evt);
}
void onDrawContent(SkCanvas* canvas) override {
SkRect r;
r.set(0, 0, this->width(), this->height());
SkPaint p;
p.setShader(make_grad(this->width(), this->height()));
canvas->drawRect(r, p);
}
private:
typedef SampleView INHERITED;
};
///////////////////////////////////////////////////////////////////////////////
static SkView* MyFactory() { return new BigGradientView; }
static SkViewRegister reg(MyFactory);
///////////////////////////////////////////////////////////////////////////////
#ifdef SK_BUILD_FOR_MAC
#include "SkCGUtils.h"
#include "SkRasterHandleAllocator.h"
class GraphicsPort {
protected:
SkCanvas* fCanvas;
public:
GraphicsPort(SkCanvas* canvas) : fCanvas(canvas) {}
virtual ~GraphicsPort() {}
void save() { fCanvas->save(); }
void saveLayer(const SkRect& bounds, SkAlpha alpha) {
fCanvas->saveLayerAlpha(&bounds, alpha);
}
void restore() { fCanvas->restore(); }
void translate(float x, float y) { fCanvas->translate(x, y); }
void scale(float s) { fCanvas->scale(s, s); }
void drawOval(const SkRect& r, SkColor c) {
SkPaint p;
p.setColor(c);
fCanvas->drawOval(r, p);
}
virtual void drawRect(const SkRect& r, SkColor c) {
SkPaint p;
p.setColor(c);
fCanvas->drawRect(r, p);
}
};
class CGGraphicsPort : public GraphicsPort {
public:
CGGraphicsPort(SkCanvas* canvas) : GraphicsPort(canvas) {}
void drawRect(const SkRect& r, SkColor c) override {
CGContextRef cg = (CGContextRef)fCanvas->accessTopRasterHandle();
CGColorRef color = CGColorCreateGenericRGB(SkColorGetR(c)/255.f,
SkColorGetG(c)/255.f,
SkColorGetB(c)/255.f,
SkColorGetA(c)/255.f);
CGContextSetFillColorWithColor(cg, color);
CGContextFillRect(cg, CGRectMake(r.x(), r.y(), r.width(), r.height()));
}
};
static CGAffineTransform matrix_to_transform(CGContextRef cg, const SkMatrix& ctm) {
SkMatrix matrix;
matrix.setScale(1, -1);
matrix.postTranslate(0, SkIntToScalar(CGBitmapContextGetHeight(cg)));
matrix.preConcat(ctm);
return CGAffineTransformMake(matrix[SkMatrix::kMScaleX],
matrix[SkMatrix::kMSkewY],
matrix[SkMatrix::kMSkewX],
matrix[SkMatrix::kMScaleY],
matrix[SkMatrix::kMTransX],
matrix[SkMatrix::kMTransY]);
}
class Allocator_CG : public SkRasterHandleAllocator {
public:
Allocator_CG() {}
bool allocHandle(const SkImageInfo& info, Rec* rec) override {
// let CG allocate the pixels
CGContextRef cg = SkCreateCGContext(SkPixmap(info, nullptr, 0));
if (!cg) {
return false;
}
rec->fReleaseProc = [](void* pixels, void* ctx){ CGContextRelease((CGContextRef)ctx); };
rec->fReleaseCtx = cg;
rec->fPixels = CGBitmapContextGetData(cg);
rec->fRowBytes = CGBitmapContextGetBytesPerRow(cg);
rec->fHandle = cg;
CGContextSaveGState(cg); // balanced each time updateContext is called
return true;
}
void updateHandle(Handle hndl, const SkMatrix& ctm, const SkIRect& clip) override {
CGContextRef cg = (CGContextRef)hndl;
CGContextRestoreGState(cg);
CGContextSaveGState(cg);
CGContextClearRect(cg, CGRectMake(clip.x(), clip.y(), clip.width(), clip.height()));
CGContextConcatCTM(cg, matrix_to_transform(cg, ctm));
}
};
class RasterAllocatorSample : public SampleView {
public:
RasterAllocatorSample() {}
protected:
bool onQuery(SkEvent* evt) override {
if (SampleCode::TitleQ(*evt)) {
SampleCode::TitleR(evt, "raster-allocator");
return true;
}
return this->INHERITED::onQuery(evt);
}
void doDraw(GraphicsPort* port) {
port->drawRect({0, 0, 256, 256}, SK_ColorRED);
port->save();
port->translate(30, 30);
port->drawRect({0, 0, 30, 30}, SK_ColorBLUE);
port->drawOval({10, 10, 20, 20}, SK_ColorWHITE);
port->restore();
port->saveLayer({50, 50, 100, 100}, 0x80);
port->drawRect({55, 55, 95, 95}, SK_ColorGREEN);
port->restore();
}
void onDrawContent(SkCanvas* canvas) override {
GraphicsPort skp(canvas);
doDraw(&skp);
const SkImageInfo info = SkImageInfo::MakeN32Premul(256, 256);
std::unique_ptr<SkCanvas> c2 =
SkRasterHandleAllocator::MakeCanvas(skstd::make_unique<Allocator_CG>(), info);
CGGraphicsPort cgp(c2.get());
doDraw(&cgp);
SkPixmap pm;
c2->peekPixels(&pm);
SkBitmap bm;
bm.installPixels(pm);
canvas->drawBitmap(bm, 280, 0, nullptr);
}
private:
typedef SampleView INHERITED;
};
DEF_SAMPLE( return new RasterAllocatorSample; )
#endif
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