зеркало из https://github.com/mozilla/moz-skia.git
134 строки
3.9 KiB
C++
134 строки
3.9 KiB
C++
/*
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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 "gm.h"
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#include "SkCanvas.h"
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#include "SkColorPriv.h"
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#include "SkShader.h"
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#include "SkArithmeticMode.h"
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#include "SkGradientShader.h"
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#define WW 100
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#define HH 32
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static SkBitmap make_bm() {
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SkBitmap bm;
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bm.allocN32Pixels(WW, HH);
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bm.eraseColor(SK_ColorTRANSPARENT);
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return bm;
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}
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static SkBitmap make_src() {
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SkBitmap bm = make_bm();
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SkCanvas canvas(bm);
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SkPaint paint;
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SkPoint pts[] = { {0, 0}, {SkIntToScalar(WW), SkIntToScalar(HH)} };
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SkColor colors[] = {
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SK_ColorTRANSPARENT, SK_ColorGREEN, SK_ColorCYAN,
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SK_ColorRED, SK_ColorMAGENTA, SK_ColorWHITE,
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};
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SkShader* s = SkGradientShader::CreateLinear(pts, colors, NULL, SK_ARRAY_COUNT(colors),
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SkShader::kClamp_TileMode);
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paint.setShader(s)->unref();
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canvas.drawPaint(paint);
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return bm;
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}
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static SkBitmap make_dst() {
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SkBitmap bm = make_bm();
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SkCanvas canvas(bm);
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SkPaint paint;
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SkPoint pts[] = { {0, SkIntToScalar(HH)}, {SkIntToScalar(WW), 0} };
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SkColor colors[] = {
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SK_ColorBLUE, SK_ColorYELLOW, SK_ColorBLACK, SK_ColorGREEN, SK_ColorGRAY
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};
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SkShader* s = SkGradientShader::CreateLinear(pts, colors, NULL, SK_ARRAY_COUNT(colors),
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SkShader::kClamp_TileMode);
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paint.setShader(s)->unref();
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canvas.drawPaint(paint);
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return bm;
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}
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static void show_k_text(SkCanvas* canvas, SkScalar x, SkScalar y, const SkScalar k[]) {
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SkPaint paint;
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paint.setTextSize(SkIntToScalar(24));
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paint.setAntiAlias(true);
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sk_tool_utils::set_portable_typeface(&paint);
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for (int i = 0; i < 4; ++i) {
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SkString str;
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str.appendScalar(k[i]);
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SkScalar width = paint.measureText(str.c_str(), str.size());
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canvas->drawText(str.c_str(), str.size(), x, y + paint.getTextSize(), paint);
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x += width + SkIntToScalar(10);
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}
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}
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class ArithmodeGM : public skiagm::GM {
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public:
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ArithmodeGM () {}
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protected:
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virtual SkString onShortName() {
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return SkString("arithmode");
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}
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virtual SkISize onISize() { return SkISize::Make(640, 480); }
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virtual void onDraw(SkCanvas* canvas) {
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SkBitmap src = make_src();
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SkBitmap dst = make_dst();
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const SkScalar one = SK_Scalar1;
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static const SkScalar K[] = {
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0, 0, 0, 0,
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0, 0, 0, one,
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0, one, 0, 0,
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0, 0, one, 0,
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0, one, one, 0,
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0, one, -one, 0,
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0, one/2, one/2, 0,
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0, one/2, one/2, one/4,
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0, one/2, one/2, -one/4,
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one/4, one/2, one/2, 0,
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-one/4, one/2, one/2, 0,
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};
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const SkScalar* k = K;
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const SkScalar* stop = k + SK_ARRAY_COUNT(K);
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SkScalar y = 0;
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SkScalar gap = SkIntToScalar(src.width() + 20);
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while (k < stop) {
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SkScalar x = 0;
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canvas->drawBitmap(src, x, y, NULL);
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x += gap;
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canvas->drawBitmap(dst, x, y, NULL);
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x += gap;
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SkRect rect = SkRect::MakeXYWH(x, y, SkIntToScalar(WW), SkIntToScalar(HH));
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canvas->saveLayer(&rect, NULL);
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canvas->drawBitmap(dst, x, y, NULL);
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SkXfermode* xfer = SkArithmeticMode::Create(k[0], k[1], k[2], k[3]);
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SkPaint paint;
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paint.setXfermode(xfer)->unref();
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canvas->drawBitmap(src, x, y, &paint);
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canvas->restore();
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x += gap;
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show_k_text(canvas, x, y, k);
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k += 4;
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y += SkIntToScalar(src.height() + 12);
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}
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}
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private:
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typedef GM INHERITED;
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};
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///////////////////////////////////////////////////////////////////////////////
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static skiagm::GM* MyFactory(void*) { return new ArithmodeGM; }
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static skiagm::GMRegistry reg(MyFactory);
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