#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 fBG; SkBitmap fSrcB, fDstB; /* The sourceType argument indicates what to draw for the source part. Skia * uses the implied shape of the drawing command and these modes * demonstrate that. * * 0x01: A WxH image with a rectangle in the lower right. * 0x02: Same as 0x01, but with an alpha of 34.5%. * 0x04: Same as 0x02, but scaled down by half. * 0x08: The same rectangle as 0x01, but drawn directly instead in an image. * 0x10: Two rectangles, first on the right half, second on the bottom half. * 0x20: Same as 0x10, but on a layer. */ void draw_mode(SkCanvas* canvas, SkXfermode* mode, int sourceType, SkScalar x, SkScalar y) { SkPaint p; SkMatrix m; bool restoreNeeded = false; m.setTranslate(x, y); canvas->drawBitmapMatrix(fSrcB, m, &p); p.setXfermode(mode); switch (sourceType) { case 0x20: { SkRect bounds = SkRect::MakeXYWH(x, y, W, H); canvas->saveLayer(&bounds, &p); restoreNeeded = true; p.setXfermodeMode(SkXfermode::kSrcOver_Mode); // Fall through. } case 0x10: { SkScalar halfW = SkIntToScalar(W) / 2; SkScalar halfH = SkIntToScalar(H) / 2; p.setColor(0xFF66AAFF); SkRect r = SkRect::MakeXYWH(x + halfW, y, halfW, H); canvas->drawRect(r, p); p.setColor(0xFFAA66FF); r = SkRect::MakeXYWH(x, y + halfH, W, halfH); canvas->drawRect(r, p); break; } case 0x8: { SkScalar w = SkIntToScalar(W); SkScalar h = SkIntToScalar(H); SkRect r = SkRect::MakeXYWH(x + w / 3, y + h / 3, w * 37 / 60, h * 37 / 60); p.setColor(0xFF66AAFF); canvas->drawRect(r, p); break; } case 0x4: m.postScale(SK_ScalarHalf, SK_ScalarHalf, x, y); // Fall through. case 0x2: p.setAlpha(0x88); // Fall through. case 0x1: canvas->drawBitmapMatrix(fDstB, m, &p); break; default: break; } if (restoreNeeded) { canvas->restore(); } } public: const static int W = 64; const static int H = 64; XfermodesGM() { // Do all this work in a temporary so we get a deep copy, // especially of gBG. SkBitmap scratchBitmap; scratchBitmap.setConfig(SkBitmap::kARGB_4444_Config, 2, 2, 4); scratchBitmap.setPixels(gBG); scratchBitmap.setIsOpaque(true); scratchBitmap.copyTo(&fBG, SkBitmap::kARGB_4444_Config); make_bitmaps(W, H, &fSrcB, &fDstB); } protected: virtual SkString onShortName() { return SkString("xfermodes"); } virtual SkISize onISize() { return make_isize(1590, 640); } void drawBG(SkCanvas* canvas) { canvas->drawColor(SK_ColorWHITE); } virtual void onDraw(SkCanvas* canvas) { canvas->translate(SkIntToScalar(10), SkIntToScalar(20)); this->drawBG(canvas); const int kMaxSourceType = 0x20; const struct { SkXfermode::Mode fMode; const char* fLabel; int fSourceTypeMask; // The source types to use this // mode with. See draw_mode for // an explanation of each type. // PDF has to play some tricks // to support the base modes, // test those more extensively. } gModes[] = { { SkXfermode::kClear_Mode, "Clear", 0x3F }, { SkXfermode::kSrc_Mode, "Src", 0x3F }, { SkXfermode::kDst_Mode, "Dst", 0x3F }, { SkXfermode::kSrcOver_Mode, "SrcOver", 0x3F }, { SkXfermode::kDstOver_Mode, "DstOver", 0x3F }, { SkXfermode::kSrcIn_Mode, "SrcIn", 0x3F }, { SkXfermode::kDstIn_Mode, "DstIn", 0x3F }, { SkXfermode::kSrcOut_Mode, "SrcOut", 0x3F }, { SkXfermode::kDstOut_Mode, "DstOut", 0x3F }, { SkXfermode::kSrcATop_Mode, "SrcATop", 0x3F }, { SkXfermode::kDstATop_Mode, "DstATop", 0x3F }, { SkXfermode::kXor_Mode, "Xor", 0x03 }, { SkXfermode::kPlus_Mode, "Plus", 0x03 }, { SkXfermode::kMultiply_Mode, "Multiply", 0x3F }, { SkXfermode::kScreen_Mode, "Screen", 0x03 }, { SkXfermode::kOverlay_Mode, "Overlay", 0x03 }, { SkXfermode::kDarken_Mode, "Darken", 0x03 }, { SkXfermode::kLighten_Mode, "Lighten", 0x03 }, { SkXfermode::kColorDodge_Mode, "ColorDodge", 0x03 }, { SkXfermode::kColorBurn_Mode, "ColorBurn", 0x03 }, { SkXfermode::kHardLight_Mode, "HardLight", 0x03 }, { SkXfermode::kSoftLight_Mode, "SoftLight", 0x03 }, { SkXfermode::kDifference_Mode, "Difference", 0x03 }, { SkXfermode::kExclusion_Mode, "Exclusion", 0x03 }, }; const SkScalar w = SkIntToScalar(W); const SkScalar h = SkIntToScalar(H); 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; SkScalar y0 = 0; for (int sourceType = 1; sourceType <= kMaxSourceType; sourceType *=2) { SkScalar x = x0, y = y0; for (size_t i = 0; i < SK_ARRAY_COUNT(gModes); i++) { if ((gModes[i].fSourceTypeMask & sourceType) == 0) { continue; } SkXfermode* mode = SkXfermode::Create(gModes[i].fMode); SkAutoUnref aur(mode); SkRect r; r.set(x, y, x+w, y+h); SkPaint p; p.setStyle(SkPaint::kFill_Style); p.setShader(s); canvas->drawRect(r, p); canvas->saveLayer(&r, NULL, SkCanvas::kARGB_ClipLayer_SaveFlag); draw_mode(canvas, mode, sourceType, r.fLeft, r.fTop); canvas->restore(); r.inset(-SK_ScalarHalf, -SK_ScalarHalf); p.setStyle(SkPaint::kStroke_Style); p.setShader(NULL); canvas->drawRect(r, p); #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 % W) == W - 1) { x = x0; y += h + SkIntToScalar(30); } } if (y < 320) { if (x > x0) { y += h + SkIntToScalar(30); } y0 = y; } else { x0 += SkIntToScalar(400); y0 = 0; } } s->unref(); } private: typedef GM INHERITED; }; ////////////////////////////////////////////////////////////////////////////// static GM* MyFactory(void*) { return new XfermodesGM; } static GMRegistry reg(MyFactory); }