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#include "gm.h"
#include "SkBitmap.h"
#include "SkShader.h"
#include "SkXfermode.h"
namespace skiagm {
static void make_bitmaps(int w, int h, SkBitmap* src, SkBitmap* dst) {
src->setConfig(SkBitmap::kARGB_8888_Config, w, h);
src->allocPixels();
src->eraseColor(0);
SkCanvas c(*src);
SkPaint p;
SkRect r;
SkScalar ww = SkIntToScalar(w);
SkScalar hh = SkIntToScalar(h);
p.setAntiAlias(true);
p.setColor(0xFFFFCC44);
r.set(0, 0, ww*3/4, hh*3/4);
c.drawOval(r, p);
dst->setConfig(SkBitmap::kARGB_8888_Config, w, h);
dst->allocPixels();
dst->eraseColor(0);
c.setBitmapDevice(*dst);
p.setColor(0xFF66AAFF);
r.set(ww/3, hh/3, ww*19/20, hh*19/20);
c.drawRect(r, p);
}
static uint16_t gBG[] = { 0xFFFF, 0xCCCF, 0xCCCF, 0xFFFF };
class XfermodesGM : public GM {
SkBitmap fBitmap;
SkBitmap fBG;
SkBitmap fSrcB, fDstB;
void draw_mode(SkCanvas* canvas, SkXfermode* mode, int alpha) {
SkPaint p;
canvas->drawBitmap(fSrcB, 0, 0, &p);
p.setAlpha(alpha);
p.setXfermode(mode);
canvas->drawBitmap(fDstB, 0, 0, &p);
}
public:
XfermodesGM() {
const int W = 64;
const int H = 64;
fBitmap.setConfig(SkBitmap::kARGB_8888_Config, W, H);
fBitmap.allocPixels();
fBG.setConfig(SkBitmap::kARGB_4444_Config, 2, 2, 4);
fBG.setPixels(gBG);
fBG.setIsOpaque(true);
make_bitmaps(W, H, &fSrcB, &fDstB);
}
protected:
SkString onShortName() {
return SkString("xfermodes");
}
SkISize onISize() { return make_isize(400, 250); }
void drawBG(SkCanvas* canvas) {
canvas->drawColor(SK_ColorWHITE);
return;
SkShader* s = SkShader::CreateBitmapShader(fBG,
SkShader::kRepeat_TileMode,
SkShader::kRepeat_TileMode);
SkPaint p;
SkMatrix m;
p.setShader(s)->unref();
m.setScale(SkIntToScalar(8), SkIntToScalar(8));
s->setLocalMatrix(m);
canvas->drawPaint(p);
}
virtual void onDraw(SkCanvas* canvas) {
this->drawBG(canvas);
const struct {
SkPorterDuff::Mode fMode;
const char* fLabel;
} gModes[] = {
{ SkPorterDuff::kClear_Mode, "Clear" },
{ SkPorterDuff::kSrc_Mode, "Src" },
{ SkPorterDuff::kDst_Mode, "Dst" },
{ SkPorterDuff::kSrcOver_Mode, "SrcOver" },
{ SkPorterDuff::kDstOver_Mode, "DstOver" },
{ SkPorterDuff::kSrcIn_Mode, "SrcIn" },
{ SkPorterDuff::kDstIn_Mode, "DstIn" },
{ SkPorterDuff::kSrcOut_Mode, "SrcOut" },
{ SkPorterDuff::kDstOut_Mode, "DstOut" },
{ SkPorterDuff::kSrcATop_Mode, "SrcATop" },
{ SkPorterDuff::kDstATop_Mode, "DstATop" },
{ SkPorterDuff::kXor_Mode, "Xor" },
{ SkPorterDuff::kDarken_Mode, "Darken" },
{ SkPorterDuff::kLighten_Mode, "Lighten" },
{ SkPorterDuff::kMultiply_Mode, "Multiply" },
{ SkPorterDuff::kScreen_Mode, "Screen" }
};
canvas->translate(SkIntToScalar(10), SkIntToScalar(20));
SkCanvas c(fBitmap);
const SkScalar w = SkIntToScalar(fBitmap.width());
const SkScalar h = SkIntToScalar(fBitmap.height());
SkShader* s = SkShader::CreateBitmapShader(fBG,
SkShader::kRepeat_TileMode,
SkShader::kRepeat_TileMode);
SkMatrix m;
m.setScale(SkIntToScalar(6), SkIntToScalar(6));
s->setLocalMatrix(m);
SkPaint labelP;
labelP.setAntiAlias(true);
labelP.setTextAlign(SkPaint::kCenter_Align);
SkScalar x0 = 0;
for (int twice = 0; twice < 2; twice++) {
SkScalar x = x0, y = 0;
for (size_t i = 0; i < SK_ARRAY_COUNT(gModes); i++) {
SkXfermode* mode = SkPorterDuff::CreateXfermode(gModes[i].fMode);
fBitmap.eraseColor(0);
draw_mode(&c, mode, twice ? 0x88 : 0xFF);
mode->safeUnref();
SkPaint p;
SkRect r;
r.set(x, y, x+w, y+h);
r.inset(-SK_ScalarHalf, -SK_ScalarHalf);
p.setStyle(SkPaint::kStroke_Style);
canvas->drawRect(r, p);
p.setStyle(SkPaint::kFill_Style);
p.setShader(s);
r.inset(SK_ScalarHalf, SK_ScalarHalf);
canvas->drawRect(r, p);
canvas->drawBitmap(fBitmap, x, y, NULL);
#if 1
canvas->drawText(gModes[i].fLabel, strlen(gModes[i].fLabel),
x + w/2, y - labelP.getTextSize()/2, labelP);
#endif
x += w + SkIntToScalar(10);
if ((i & 3) == 3) {
x = x0;
y += h + SkIntToScalar(30);
}
}
x0 += SkIntToScalar(330);
}
s->unref();
}
private:
typedef GM INHERITED;
};
//////////////////////////////////////////////////////////////////////////////
static GM* MyFactory(void*) { return new XfermodesGM; }
static GMRegistry reg(MyFactory);
}
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