зеркало из https://github.com/mozilla/moz-skia.git
85 строки
2.4 KiB
C++
85 строки
2.4 KiB
C++
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/*
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* Copyright 2011 Google Inc.
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*
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* Use of this source code is governed by a BSD-style license that can be
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* found in the LICENSE file.
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*/
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#include "SampleCode.h"
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#include "SkView.h"
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#include "SkCanvas.h"
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#include "SkShader.h"
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#include "SkUtils.h"
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#include "SkDevice.h"
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static void create_bitmap(SkBitmap* bitmap) {
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const int W = 100;
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const int H = 100;
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bitmap->setConfig(SkBitmap::kARGB_8888_Config, W, H);
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bitmap->allocPixels();
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SkCanvas canvas(*bitmap);
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canvas.drawColor(SK_ColorRED);
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SkPaint paint;
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paint.setColor(SK_ColorBLUE);
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canvas.drawCircle(SkIntToScalar(W)/2, SkIntToScalar(H)/2, SkIntToScalar(W)/2, paint);
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}
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class DrawBitmapView : public SampleView {
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SkPath fPath;
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public:
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DrawBitmapView() {}
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protected:
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// overrides from SkEventSink
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virtual bool onQuery(SkEvent* evt) {
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if (SampleCode::TitleQ(*evt)) {
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SampleCode::TitleR(evt, "DrawBitmap");
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return true;
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}
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return this->INHERITED::onQuery(evt);
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}
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virtual void onDrawContent(SkCanvas* canvas) {
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SkBitmap bitmap;
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create_bitmap(&bitmap);
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int x = bitmap.width() / 2;
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int y = bitmap.height() / 2;
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SkBitmap subset;
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bitmap.extractSubset(&subset, SkIRect::MakeXYWH(x, y, x, y));
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canvas->translate(SkIntToScalar(20), SkIntToScalar(20));
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canvas->drawBitmap(bitmap, 0, 0);
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canvas->drawBitmap(subset, 0, 0);
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// Now do the same but with a device bitmap as source image
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SkRefPtr<SkDevice> primaryDevice(canvas->getDevice());
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SkRefPtr<SkDevice> secondDevice(canvas->createCompatibleDevice(
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SkBitmap::kARGB_8888_Config, bitmap.width(),
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bitmap.height(), true));
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secondDevice->unref();
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SkCanvas secondCanvas(secondDevice.get());
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secondCanvas.writePixels(bitmap, 0, 0);
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SkBitmap deviceBitmap = secondDevice->accessBitmap(false);
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SkBitmap deviceSubset;
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deviceBitmap.extractSubset(&deviceSubset,
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SkIRect::MakeXYWH(x, y, x, y));
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canvas->translate(SkIntToScalar(120), SkIntToScalar(0));
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canvas->drawBitmap(deviceBitmap, 0, 0);
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canvas->drawBitmap(deviceSubset, 0, 0);
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}
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private:
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typedef SampleView INHERITED;
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};
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//////////////////////////////////////////////////////////////////////////////
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static SkView* MyFactory() { return new DrawBitmapView; }
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static SkViewRegister reg(MyFactory);
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