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/*
* Copyright 2011 Google Inc.
*
* Use of this source code is governed by a BSD-style license that can be
* found in the LICENSE file.
*/
#include "SampleCode.h"
#include "SkView.h"
#include "SkCanvas.h"
#include "SkDevice.h"
#include "SkColorPriv.h"
#include "SkShader.h"
static SkCanvas* create_canvas(int w, int h) {
SkBitmap bm;
bm.setConfig(SkBitmap::kARGB_8888_Config, w, h);
bm.allocPixels();
bm.eraseColor(0);
return new SkCanvas(bm);
}
static const SkBitmap& extract_bitmap(SkCanvas* canvas) {
return canvas->getDevice()->accessBitmap(false);
}
static const struct {
SkXfermode::Mode fMode;
const char* fLabel;
} gModes[] = {
{ SkXfermode::kClear_Mode, "Clear" },
{ SkXfermode::kSrc_Mode, "Src" },
{ SkXfermode::kDst_Mode, "Dst" },
{ SkXfermode::kSrcOver_Mode, "SrcOver" },
{ SkXfermode::kDstOver_Mode, "DstOver" },
{ SkXfermode::kSrcIn_Mode, "SrcIn" },
{ SkXfermode::kDstIn_Mode, "DstIn" },
{ SkXfermode::kSrcOut_Mode, "SrcOut" },
{ SkXfermode::kDstOut_Mode, "DstOut" },
{ SkXfermode::kSrcATop_Mode, "SrcATop" },
{ SkXfermode::kDstATop_Mode, "DstATop" },
{ SkXfermode::kXor_Mode, "Xor" },
};
const int gWidth = 64;
const int gHeight = 64;
const SkScalar W = SkIntToScalar(gWidth);
const SkScalar H = SkIntToScalar(gHeight);
static SkScalar drawCell(SkCanvas* canvas, SkXfermode* mode, SkAlpha a0, SkAlpha a1) {
SkPaint paint;
paint.setAntiAlias(true);
SkRect r = SkRect::MakeWH(W, H);
r.inset(W/10, H/10);
paint.setColor(SK_ColorBLUE);
paint.setAlpha(a0);
canvas->drawOval(r, paint);
paint.setColor(SK_ColorRED);
paint.setAlpha(a1);
paint.setXfermode(mode);
for (int angle = 0; angle < 24; ++angle) {
SkScalar x = SkScalarCos(SkIntToScalar(angle) * (SK_ScalarPI * 2) / 24) * gWidth;
SkScalar y = SkScalarSin(SkIntToScalar(angle) * (SK_ScalarPI * 2) / 24) * gHeight;
paint.setStrokeWidth(SK_Scalar1 * angle * 2 / 24);
canvas->drawLine(W/2, H/2, W/2 + x, H/2 + y, paint);
}
return H;
}
static SkShader* make_bg_shader() {
SkBitmap bm;
bm.setConfig(SkBitmap::kARGB_8888_Config, 2, 2);
bm.allocPixels();
*bm.getAddr32(0, 0) = *bm.getAddr32(1, 1) = 0xFFFFFFFF;
*bm.getAddr32(1, 0) = *bm.getAddr32(0, 1) = SkPackARGB32(0xFF, 0xCC, 0xCC, 0xCC);
SkShader* s = SkShader::CreateBitmapShader(bm,
SkShader::kRepeat_TileMode,
SkShader::kRepeat_TileMode);
SkMatrix m;
m.setScale(SkIntToScalar(6), SkIntToScalar(6));
s->setLocalMatrix(m);
return s;
}
class HairModesView : public SampleView {
SkPaint fBGPaint;
public:
HairModesView() {
fBGPaint.setShader(make_bg_shader())->unref();
}
protected:
// overrides from SkEventSink
virtual bool onQuery(SkEvent* evt) {
if (SampleCode::TitleQ(*evt)) {
SampleCode::TitleR(evt, "HairlineModes");
return true;
}
return this->INHERITED::onQuery(evt);
}
virtual void onDrawContent(SkCanvas* canvas) {
const SkRect bounds = SkRect::MakeWH(W, H);
static const SkAlpha gAlphaValue[] = { 0xFF, 0x88, 0x88 };
canvas->translate(SkIntToScalar(4), SkIntToScalar(4));
for (int alpha = 0; alpha < 4; ++alpha) {
canvas->save();
canvas->save();
for (size_t i = 0; i < SK_ARRAY_COUNT(gModes); ++i) {
if (6 == i) {
canvas->restore();
canvas->translate(W * 5, 0);
canvas->save();
}
SkXfermode* mode = SkXfermode::Create(gModes[i].fMode);
canvas->drawRect(bounds, fBGPaint);
canvas->saveLayer(&bounds, NULL);
SkScalar dy = drawCell(canvas, mode,
gAlphaValue[alpha & 1],
gAlphaValue[alpha & 2]);
canvas->restore();
canvas->translate(0, dy * 5 / 4);
SkSafeUnref(mode);
}
canvas->restore();
canvas->restore();
canvas->translate(W * 5 / 4, 0);
}
}
private:
typedef SampleView INHERITED;
};
///////////////////////////////////////////////////////////////////////////////
static SkView* MyFactory() { return new HairModesView; }
static SkViewRegister reg(MyFactory);
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