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/*
* Copyright 2013 Google Inc.
*
* Use of this source code is governed by a BSD-style license that can be
* found in the LICENSE file.
*/
#include "gm.h"
#include "SkBitmap.h"
#include "SkShader.h"
#include "SkXfermode.h"
#include "SkColorPriv.h"
namespace skiagm {
class Xfermodes2GM : public GM {
public:
Xfermodes2GM() {}
protected:
SkString onShortName() override {
return SkString("xfermodes2");
}
SkISize onISize() override {
return SkISize::Make(455, 475);
}
void onDraw(SkCanvas* canvas) override {
canvas->translate(SkIntToScalar(10), SkIntToScalar(20));
const SkScalar w = SkIntToScalar(kSize);
const SkScalar h = SkIntToScalar(kSize);
SkPaint labelP;
labelP.setAntiAlias(true);
sk_tool_utils::set_portable_typeface(&labelP);
labelP.setTextAlign(SkPaint::kCenter_Align);
const int W = 6;
SkScalar x = 0, y = 0;
for (size_t m = 0; m <= SkXfermode::kLastMode; m++) {
SkXfermode::Mode mode = static_cast<SkXfermode::Mode>(m);
SkXfermode* xm = SkXfermode::Create(mode);
SkAutoUnref aur(xm);
canvas->save();
canvas->translate(x, y);
SkPaint p;
p.setAntiAlias(false);
p.setStyle(SkPaint::kFill_Style);
p.setShader(fBG);
SkRect r = SkRect::MakeWH(w, h);
canvas->drawRect(r, p);
canvas->saveLayer(&r, nullptr);
p.setShader(fDst);
canvas->drawRect(r, p);
p.setShader(fSrc);
p.setXfermode(xm);
canvas->drawRect(r, p);
canvas->restore();
r.inset(-SK_ScalarHalf, -SK_ScalarHalf);
p.setStyle(SkPaint::kStroke_Style);
p.setShader(nullptr);
p.setXfermode(nullptr);
canvas->drawRect(r, p);
canvas->restore();
#if 1
canvas->drawText(SkXfermode::ModeName(mode), strlen(SkXfermode::ModeName(mode)),
x + w/2, y - labelP.getTextSize()/2, labelP);
#endif
x += w + SkIntToScalar(10);
if ((m % W) == W - 1) {
x = 0;
y += h + SkIntToScalar(30);
}
}
}
private:
void onOnceBeforeDraw() override {
static const uint32_t kCheckData[] = {
SkPackARGB32(0xFF, 0x42, 0x41, 0x42),
SkPackARGB32(0xFF, 0xD6, 0xD3, 0xD6),
SkPackARGB32(0xFF, 0xD6, 0xD3, 0xD6),
SkPackARGB32(0xFF, 0x42, 0x41, 0x42)
};
SkBitmap bg;
bg.allocN32Pixels(2, 2, true);
memcpy(bg.getPixels(), kCheckData, sizeof(kCheckData));
SkMatrix lm;
lm.setScale(SkIntToScalar(16), SkIntToScalar(16));
fBG.reset(SkShader::CreateBitmapShader(bg,
SkShader::kRepeat_TileMode,
SkShader::kRepeat_TileMode,
&lm));
SkBitmap srcBmp;
srcBmp.allocN32Pixels(kSize, kSize);
SkPMColor* pixels = reinterpret_cast<SkPMColor*>(srcBmp.getPixels());
for (int y = 0; y < kSize; ++y) {
int c = y * (1 << kShift);
SkPMColor rowColor = SkPackARGB32(c, c, 0, c/2);
for (int x = 0; x < kSize; ++x) {
pixels[kSize * y + x] = rowColor;
}
}
fSrc.reset(SkShader::CreateBitmapShader(srcBmp,
SkShader::kClamp_TileMode,
SkShader::kClamp_TileMode));
SkBitmap dstBmp;
dstBmp.allocN32Pixels(kSize, kSize);
pixels = reinterpret_cast<SkPMColor*>(dstBmp.getPixels());
for (int x = 0; x < kSize; ++x) {
int c = x * (1 << kShift);
SkPMColor colColor = SkPackARGB32(c, 0, c, c/2);
for (int y = 0; y < kSize; ++y) {
pixels[kSize * y + x] = colColor;
}
}
fDst.reset(SkShader::CreateBitmapShader(dstBmp,
SkShader::kClamp_TileMode,
SkShader::kClamp_TileMode));
}
enum {
kShift = 2,
kSize = 256 >> kShift,
};
SkAutoTUnref<SkShader> fBG;
SkAutoTUnref<SkShader> fSrc;
SkAutoTUnref<SkShader> fDst;
typedef GM INHERITED;
};
//////////////////////////////////////////////////////////////////////////////
static GM* MyFactory(void*) { return new Xfermodes2GM; }
static GMRegistry reg(MyFactory);
}
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