9a6eb0e1e8
Doing it this way required modifying the arithmode GM to use saveLayer()/restore() rather than creating an offscreen SkBitmap, since otherwise the compositing is always done in raster mode. Fixing that in turn exposed that SkArithmeticMode did not work in Picture mode, since it wasn't flattenable. Made it so. Note: this will require rebaselining the arithmode GM (again). R=bsalomon@google.com, reed@google.com Originally committed: https://code.google.com/p/skia/source/detail?r=9324 Reverted: https://code.google.com/p/skia/source/detail?r=9325 Review URL: https://codereview.chromium.org/16064002 git-svn-id: http://skia.googlecode.com/svn/trunk@9330 2bbb7eff-a529-9590-31e7-b0007b416f81
134 lines
3.9 KiB
C++
134 lines
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.setConfig(SkBitmap::kARGB_8888_Config, WW, HH);
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bm.allocPixels();
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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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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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