155 lines
4.5 KiB
C++
155 lines
4.5 KiB
C++
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/*
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* Copyright 2013 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 "SkBitmap.h"
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#include "SkShader.h"
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#include "SkXfermode.h"
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#include "SkColorPriv.h"
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namespace skiagm {
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class Xfermodes2GM : public GM {
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public:
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Xfermodes2GM() {}
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protected:
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SkString onShortName() override {
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return SkString("xfermodes2");
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}
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SkISize onISize() override {
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return SkISize::Make(455, 475);
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}
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void onDraw(SkCanvas* canvas) override {
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canvas->translate(SkIntToScalar(10), SkIntToScalar(20));
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const SkScalar w = SkIntToScalar(kSize);
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const SkScalar h = SkIntToScalar(kSize);
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SkPaint labelP;
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labelP.setAntiAlias(true);
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sk_tool_utils::set_portable_typeface(&labelP);
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labelP.setTextAlign(SkPaint::kCenter_Align);
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const int W = 6;
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SkScalar x = 0, y = 0;
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for (size_t m = 0; m <= SkXfermode::kLastMode; m++) {
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SkXfermode::Mode mode = static_cast<SkXfermode::Mode>(m);
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SkXfermode* xm = SkXfermode::Create(mode);
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SkAutoUnref aur(xm);
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canvas->save();
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canvas->translate(x, y);
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SkPaint p;
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p.setAntiAlias(false);
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p.setStyle(SkPaint::kFill_Style);
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p.setShader(fBG);
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SkRect r = SkRect::MakeWH(w, h);
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canvas->drawRect(r, p);
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canvas->saveLayer(&r, NULL);
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p.setShader(fDst);
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canvas->drawRect(r, p);
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p.setShader(fSrc);
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p.setXfermode(xm);
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canvas->drawRect(r, p);
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canvas->restore();
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r.inset(-SK_ScalarHalf, -SK_ScalarHalf);
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p.setStyle(SkPaint::kStroke_Style);
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p.setShader(NULL);
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p.setXfermode(NULL);
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canvas->drawRect(r, p);
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canvas->restore();
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#if 1
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canvas->drawText(SkXfermode::ModeName(mode), strlen(SkXfermode::ModeName(mode)),
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x + w/2, y - labelP.getTextSize()/2, labelP);
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#endif
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x += w + SkIntToScalar(10);
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if ((m % W) == W - 1) {
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x = 0;
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y += h + SkIntToScalar(30);
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}
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}
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}
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private:
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void onOnceBeforeDraw() override {
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static const uint32_t kCheckData[] = {
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SkPackARGB32(0xFF, 0x40, 0x40, 0x40),
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SkPackARGB32(0xFF, 0xD0, 0xD0, 0xD0),
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SkPackARGB32(0xFF, 0xD0, 0xD0, 0xD0),
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SkPackARGB32(0xFF, 0x40, 0x40, 0x40)
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};
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SkBitmap bg;
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bg.allocN32Pixels(2, 2, true);
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memcpy(bg.getPixels(), kCheckData, sizeof(kCheckData));
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SkMatrix lm;
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lm.setScale(SkIntToScalar(16), SkIntToScalar(16));
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fBG.reset(SkShader::CreateBitmapShader(bg,
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SkShader::kRepeat_TileMode,
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SkShader::kRepeat_TileMode,
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&lm));
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SkBitmap srcBmp;
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srcBmp.allocN32Pixels(kSize, kSize);
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SkPMColor* pixels = reinterpret_cast<SkPMColor*>(srcBmp.getPixels());
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for (int y = 0; y < kSize; ++y) {
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int c = y * (1 << kShift);
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SkPMColor rowColor = SkPackARGB32(c, c, 0, c/2);
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for (int x = 0; x < kSize; ++x) {
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pixels[kSize * y + x] = rowColor;
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}
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}
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fSrc.reset(SkShader::CreateBitmapShader(srcBmp,
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SkShader::kClamp_TileMode,
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SkShader::kClamp_TileMode));
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SkBitmap dstBmp;
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dstBmp.allocN32Pixels(kSize, kSize);
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pixels = reinterpret_cast<SkPMColor*>(dstBmp.getPixels());
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for (int x = 0; x < kSize; ++x) {
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int c = x * (1 << kShift);
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SkPMColor colColor = SkPackARGB32(c, 0, c, c/2);
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for (int y = 0; y < kSize; ++y) {
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pixels[kSize * y + x] = colColor;
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}
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}
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fDst.reset(SkShader::CreateBitmapShader(dstBmp,
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SkShader::kClamp_TileMode,
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SkShader::kClamp_TileMode));
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}
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enum {
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kShift = 2,
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kSize = 256 >> kShift,
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};
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SkAutoTUnref<SkShader> fBG;
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SkAutoTUnref<SkShader> fSrc;
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SkAutoTUnref<SkShader> fDst;
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typedef GM INHERITED;
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};
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//////////////////////////////////////////////////////////////////////////////
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static GM* MyFactory(void*) { return new Xfermodes2GM; }
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static GMRegistry reg(MyFactory);
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}
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