зеркало из https://github.com/mozilla/moz-skia.git
147 строки
4.0 KiB
C++
147 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 "Sk64.h"
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#include "SkCornerPathEffect.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 "SkKernel33MaskFilter.h"
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#include "SkPath.h"
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#include "SkRandom.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 "SkColorPriv.h"
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#include "SkColorFilter.h"
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#include "SkTime.h"
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#include "SkTypeface.h"
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#include "SkXfermode.h"
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#include "SkStream.h"
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#include "SkXMLParser.h"
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#include "SkColorPriv.h"
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#include "SkImageDecoder.h"
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class LinesView : public SkView {
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public:
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LinesView()
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{
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unsigned r = 0x1F;
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unsigned g = 0x3F;
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for (unsigned a = 0; a <= 0xF; a++) {
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unsigned scale = 16 - SkAlpha15To16(a);
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unsigned sr = (a << 1) | (a >> 3);
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unsigned dr = r * scale >> 4;
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unsigned sg = (a << 2) | (a >> 2);
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unsigned dg = g * scale >> 4;
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unsigned ssg = sg & ~(~(a >> 3) & 1);
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printf("4444 sa=%d sr=%d sg=%d da=%d dr=%d dg=%d total-r=%d total-g=%d %d\n",
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a, sr, sg, scale, dr, dg, sr+dr, sg+dg, ssg+dg);
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}
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for (unsigned aa = 0; aa <= 0xFF; aa++) {
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unsigned invScale = SkAlpha255To256(255 - aa);
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unsigned dst = SkAlphaMul(0xFF, invScale);
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printf("8888 sa=%02x dst=%02x sum=%d %s\n", aa, dst, aa+dst,
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(aa+dst) > 0xFF ? "OVERFLOW" : "");
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}
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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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{
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if (SampleCode::TitleQ(*evt))
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{
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SampleCode::TitleR(evt, "Lines");
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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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// canvas->drawColor(SK_ColorBLACK);
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}
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/*
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0x1F * x + 0x1F * (32 - x)
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*/
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void drawRings(SkCanvas* canvas)
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{
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canvas->scale(SkIntToScalar(1)/2, SkIntToScalar(1)/2);
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SkRect r;
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SkScalar x = SkIntToScalar(10);
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SkScalar y = SkIntToScalar(10);
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r.set(x, y, x + SkIntToScalar(100), y + SkIntToScalar(100));
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SkPaint paint;
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paint.setAntiAlias(true);
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paint.setStyle(SkPaint::kStroke_Style);
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paint.setStrokeWidth(SkScalarHalf(SkIntToScalar(3)));
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paint.setColor(0xFFFF8800);
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paint.setColor(0xFFFFFFFF);
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canvas->drawRect(r, paint);
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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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SkBitmap bm;
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SkImageDecoder::DecodeFile("/kill.gif", &bm);
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canvas->drawBitmap(bm, 0, 0, NULL);
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this->drawRings(canvas);
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return;
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SkPaint paint;
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// fAlpha = 0x80;
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paint.setColor(SK_ColorWHITE);
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paint.setAlpha(fAlpha & 0xFF);
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SkRect r;
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SkScalar x = SkIntToScalar(10);
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SkScalar y = SkIntToScalar(10);
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r.set(x, y, x + SkIntToScalar(100), y + SkIntToScalar(100));
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canvas->drawRect(r, paint);
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return;
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paint.setColor(0xffffff00); // yellow
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paint.setStyle(SkPaint::kStroke_Style);
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paint.setStrokeWidth(SkIntToScalar(2));
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// y += SK_Scalar1/2;
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canvas->drawLine(x, y, x + SkIntToScalar(90), y + SkIntToScalar(90), paint);
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paint.setAntiAlias(true); // with anti-aliasing
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y += SkIntToScalar(10);
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canvas->drawLine(x, y, x + SkIntToScalar(90), y + SkIntToScalar(90), 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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fAlpha = SkScalarRound(y);
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this->inval(NULL);
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return NULL;
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}
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private:
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int fAlpha;
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typedef SkView INHERITED;
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};
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//////////////////////////////////////////////////////////////////////////////
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static SkView* MyFactory() { return new LinesView; }
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static SkViewRegister reg(MyFactory);
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