зеркало из https://github.com/mozilla/moz-skia.git
148 строки
4.0 KiB
C++
148 строки
4.0 KiB
C++
#include "SampleCode.h"
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#include "SkView.h"
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#include "SkCanvas.h"
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#include "SkGradientShader.h"
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#include "SkGraphics.h"
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#include "SkImageDecoder.h"
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#include "SkPath.h"
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#include "SkRegion.h"
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#include "SkShader.h"
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#include "SkUtils.h"
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#include "SkXfermode.h"
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#include "SkComposeShader.h"
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#include "SkColorPriv.h"
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#include "SkColorFilter.h"
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#include "SkTime.h"
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#include "SkTransparentShader.h"
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#include "SkTypeface.h"
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static SkShader* make_bitmapfade(const SkBitmap& bm)
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{
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SkPoint pts[2];
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SkColor colors[2];
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pts[0].set(0, 0);
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pts[1].set(0, SkIntToScalar(bm.height()));
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colors[0] = SK_ColorBLACK;
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colors[1] = SkColorSetARGB(0, 0, 0, 0);
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SkShader* shaderA = SkGradientShader::CreateLinear(pts, colors, NULL, 2, SkShader::kClamp_TileMode);
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SkShader* shaderB = SkShader::CreateBitmapShader(bm,
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SkShader::kClamp_TileMode, SkShader::kClamp_TileMode);
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SkXfermode* mode = SkXfermode::Create(SkXfermode::kDstIn_Mode);
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SkShader* shader = new SkComposeShader(shaderB, shaderA, mode);
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shaderA->unref();
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shaderB->unref();
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mode->unref();
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return shader;
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}
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class ShaderView : public SkView {
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public:
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SkShader* fShader;
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SkBitmap fBitmap;
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ShaderView()
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{
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SkImageDecoder::DecodeFile("/skimages/logo.gif", &fBitmap);
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SkPoint pts[2];
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SkColor colors[2];
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pts[0].set(0, 0);
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pts[1].set(SkIntToScalar(100), 0);
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colors[0] = SK_ColorRED;
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colors[1] = SK_ColorBLUE;
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SkShader* shaderA = SkGradientShader::CreateLinear(pts, colors, NULL, 2, SkShader::kClamp_TileMode);
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pts[0].set(0, 0);
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pts[1].set(0, SkIntToScalar(100));
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colors[0] = SK_ColorBLACK;
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colors[1] = SkColorSetARGB(0x80, 0, 0, 0);
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SkShader* shaderB = SkGradientShader::CreateLinear(pts, colors, NULL, 2, SkShader::kClamp_TileMode);
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SkXfermode* mode = SkXfermode::Create(SkXfermode::kDstIn_Mode);
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fShader = new SkComposeShader(shaderA, shaderB, mode);
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shaderA->unref();
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shaderB->unref();
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mode->unref();
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}
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virtual ~ShaderView()
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{
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fShader->safeUnref();
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}
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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, "Shaders");
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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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void drawBG(SkCanvas* canvas)
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{
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// canvas->drawColor(0xFFDDDDDD);
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canvas->drawColor(SK_ColorWHITE);
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}
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virtual void onDraw(SkCanvas* canvas)
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{
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this->drawBG(canvas);
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canvas->drawBitmap(fBitmap, 0, 0);
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canvas->translate(SkIntToScalar(20), SkIntToScalar(120));
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SkPaint paint;
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SkRect r;
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paint.setColor(SK_ColorGREEN);
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canvas->drawRectCoords(0, 0, SkIntToScalar(100), SkIntToScalar(100), paint);
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paint.setShader(fShader);
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canvas->drawRectCoords(0, 0, SkIntToScalar(100), SkIntToScalar(100), paint);
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canvas->translate(SkIntToScalar(110), 0);
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int w = fBitmap.width();
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int h = fBitmap.height();
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w = 120;
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h = 80;
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r.set(0, 0, SkIntToScalar(w), SkIntToScalar(h));
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paint.setShader(NULL);
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canvas->drawRect(r, paint);
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paint.setShader(make_bitmapfade(fBitmap))->unref();
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canvas->drawRect(r, paint);
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paint.setShader(new SkTransparentShader)->unref();
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canvas->drawRect(r, paint);
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}
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virtual SkView::Click* onFindClickHandler(SkScalar x, SkScalar y)
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{
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this->inval(NULL);
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return this->INHERITED::onFindClickHandler(x, y);
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}
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virtual bool onClick(Click* click)
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{
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return this->INHERITED::onClick(click);
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}
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private:
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typedef SkView INHERITED;
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};
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//////////////////////////////////////////////////////////////////////////////
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static SkView* MyFactory() { return new ShaderView; }
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static SkViewRegister reg(MyFactory);
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