diff options
Diffstat (limited to 'gm/xfermodes.cpp')
| -rw-r--r-- | gm/xfermodes.cpp | 188 |
1 files changed, 188 insertions, 0 deletions
diff --git a/gm/xfermodes.cpp b/gm/xfermodes.cpp new file mode 100644 index 0000000..5a43f4a --- /dev/null +++ b/gm/xfermodes.cpp @@ -0,0 +1,188 @@ +#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: + virtual SkString onShortName() { + return SkString("xfermodes"); + } + + virtual SkISize onISize() { + return make_isize(790, 480); + } + + 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 { + 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" }, + + { SkXfermode::kPlus_Mode, "Plus" }, + { SkXfermode::kMultiply_Mode, "Multiply" }, + { SkXfermode::kScreen_Mode, "Screen" }, + { SkXfermode::kOverlay_Mode, "Overlay" }, + { SkXfermode::kDarken_Mode, "Darken" }, + { SkXfermode::kLighten_Mode, "Lighten" }, + { SkXfermode::kColorDodge_Mode, "ColorDodge" }, + { SkXfermode::kColorBurn_Mode, "ColorBurn" }, + { SkXfermode::kHardLight_Mode, "HardLight" }, + { SkXfermode::kSoftLight_Mode, "SoftLight" }, + { SkXfermode::kDifference_Mode, "Difference" }, + { SkXfermode::kExclusion_Mode, "Exclusion" }, + }; + + 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); + + const int W = 5; + + 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 = SkXfermode::Create(gModes[i].fMode); + + fBitmap.eraseColor(0); + draw_mode(&c, mode, twice ? 0x88 : 0xFF); + SkSafeUnref(mode); + + 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); + + canvas->drawText(gModes[i].fLabel, strlen(gModes[i].fLabel), + x + w/2, y - labelP.getTextSize()/2, labelP); + + x += w + SkIntToScalar(10); + if ((i % W) == W - 1) { + x = x0; + y += h + SkIntToScalar(30); + } + } + x0 += SkIntToScalar(400); + } + s->unref(); + } + +private: + typedef GM INHERITED; +}; + +////////////////////////////////////////////////////////////////////////////// + +static GM* MyFactory(void*) { return new XfermodesGM; } +static GMRegistry reg(MyFactory); + +} + |