/* * 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 "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, SkBitmap* transparent) { src->allocN32Pixels(w, h); src->eraseColor(SK_ColorTRANSPARENT); SkPaint p; p.setAntiAlias(true); SkRect r; SkScalar ww = SkIntToScalar(w); SkScalar hh = SkIntToScalar(h); { SkCanvas c(*src); p.setColor(0xFFFFCC44); r.set(0, 0, ww*3/4, hh*3/4); c.drawOval(r, p); } dst->allocN32Pixels(w, h); dst->eraseColor(SK_ColorTRANSPARENT); { SkCanvas c(*dst); p.setColor(0xFF66AAFF); r.set(ww/3, hh/3, ww*19/20, hh*19/20); c.drawRect(r, p); } transparent->allocN32Pixels(w, h); transparent->eraseColor(SK_ColorTRANSPARENT); } static uint16_t gData[] = { 0xFFFF, 0xCCCF, 0xCCCF, 0xFFFF }; class XfermodesGM : public GM { enum SrcType { //! A WxH image with a rectangle in the lower right. kRectangleImage_SrcType = 0x01, //! kRectangleImage_SrcType with an alpha of 34.5%. kRectangleImageWithAlpha_SrcType = 0x02, //! kRectnagleImageWithAlpha_SrcType scaled down by half. kSmallRectangleImageWithAlpha_SrcType = 0x04, //! kRectangleImage_SrcType drawn directly instead in an image. kRectangle_SrcType = 0x08, //! Two rectangles, first on the right half, second on the bottom half. kQuarterClear_SrcType = 0x10, //! kQuarterClear_SrcType in a layer. kQuarterClearInLayer_SrcType = 0x20, //! A W/2xH/2 transparent image. kSmallTransparentImage_SrcType = 0x40, //! kRectangleImage_SrcType drawn directly with a mask. kRectangleWithMask_SrcType = 0x80, kAll_SrcType = 0xFF, //!< All the source types. kBasic_SrcType = 0x03, //!< Just basic source types. }; SkBitmap fBG; SkBitmap fSrcB, fDstB, fTransparent; /* The srcType argument indicates what to draw for the source part. Skia * uses the implied shape of the drawing command and these modes * demonstrate that. */ void draw_mode(SkCanvas* canvas, SkXfermode* mode, SrcType srcType, SkScalar x, SkScalar y) { SkPaint p; SkMatrix m; bool restoreNeeded = false; m.setTranslate(x, y); canvas->drawBitmap(fSrcB, x, y, &p); p.setXfermode(mode); switch (srcType) { case kSmallTransparentImage_SrcType: { m.postScale(SK_ScalarHalf, SK_ScalarHalf, x, y); SkAutoCanvasRestore acr(canvas, true); canvas->concat(m); canvas->drawBitmap(fTransparent, 0, 0, &p); break; } case kQuarterClearInLayer_SrcType: { SkRect bounds = SkRect::MakeXYWH(x, y, SkIntToScalar(W), SkIntToScalar(H)); canvas->saveLayer(&bounds, &p); restoreNeeded = true; p.setXfermodeMode(SkXfermode::kSrcOver_Mode); // Fall through. } case kQuarterClear_SrcType: { SkScalar halfW = SkIntToScalar(W) / 2; SkScalar halfH = SkIntToScalar(H) / 2; p.setColor(0xFF66AAFF); SkRect r = SkRect::MakeXYWH(x + halfW, y, halfW, SkIntToScalar(H)); canvas->drawRect(r, p); p.setColor(0xFFAA66FF); r = SkRect::MakeXYWH(x, y + halfH, SkIntToScalar(W), halfH); canvas->drawRect(r, p); break; } case kRectangleWithMask_SrcType: { canvas->save(); restoreNeeded = true; SkScalar w = SkIntToScalar(W); SkScalar h = SkIntToScalar(H); SkRect r = SkRect::MakeXYWH(x, y + h / 4, w, h * 23 / 60); canvas->clipRect(r); // Fall through. } case kRectangle_SrcType: { 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 kSmallRectangleImageWithAlpha_SrcType: m.postScale(SK_ScalarHalf, SK_ScalarHalf, x, y); // Fall through. case kRectangleImageWithAlpha_SrcType: p.setAlpha(0x88); // Fall through. case kRectangleImage_SrcType: { SkAutoCanvasRestore acr(canvas, true); canvas->concat(m); canvas->drawBitmap(fDstB, 0, 0, &p); break; } default: break; } if (restoreNeeded) { canvas->restore(); } } virtual void onOnceBeforeDraw() SK_OVERRIDE { fBG.installPixels(SkImageInfo::Make(2, 2, kARGB_4444_SkColorType, kOpaque_SkAlphaType), gData, 4); make_bitmaps(W, H, &fSrcB, &fDstB, &fTransparent); } public: const static int W = 64; const static int H = 64; XfermodesGM() {} protected: virtual SkString onShortName() { return SkString("xfermodes"); } virtual SkISize onISize() { return SkISize::Make(1990, 640); } virtual void onDraw(SkCanvas* canvas) { canvas->translate(SkIntToScalar(10), SkIntToScalar(20)); 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", kAll_SrcType }, { SkXfermode::kSrc_Mode, "Src", kAll_SrcType }, { SkXfermode::kDst_Mode, "Dst", kAll_SrcType }, { SkXfermode::kSrcOver_Mode, "SrcOver", kAll_SrcType }, { SkXfermode::kDstOver_Mode, "DstOver", kAll_SrcType }, { SkXfermode::kSrcIn_Mode, "SrcIn", kAll_SrcType }, { SkXfermode::kDstIn_Mode, "DstIn", kAll_SrcType }, { SkXfermode::kSrcOut_Mode, "SrcOut", kAll_SrcType }, { SkXfermode::kDstOut_Mode, "DstOut", kAll_SrcType }, { SkXfermode::kSrcATop_Mode, "SrcATop", kAll_SrcType }, { SkXfermode::kDstATop_Mode, "DstATop", kAll_SrcType }, { SkXfermode::kXor_Mode, "Xor", kBasic_SrcType }, { SkXfermode::kPlus_Mode, "Plus", kBasic_SrcType }, { SkXfermode::kModulate_Mode, "Modulate", kAll_SrcType }, { SkXfermode::kScreen_Mode, "Screen", kBasic_SrcType }, { SkXfermode::kOverlay_Mode, "Overlay", kBasic_SrcType }, { SkXfermode::kDarken_Mode, "Darken", kBasic_SrcType }, { SkXfermode::kLighten_Mode, "Lighten", kBasic_SrcType }, { SkXfermode::kColorDodge_Mode, "ColorDodge", kBasic_SrcType }, { SkXfermode::kColorBurn_Mode, "ColorBurn", kBasic_SrcType }, { SkXfermode::kHardLight_Mode, "HardLight", kBasic_SrcType }, { SkXfermode::kSoftLight_Mode, "SoftLight", kBasic_SrcType }, { SkXfermode::kDifference_Mode, "Difference", kBasic_SrcType }, { SkXfermode::kExclusion_Mode, "Exclusion", kBasic_SrcType }, { SkXfermode::kMultiply_Mode, "Multiply", kAll_SrcType }, { SkXfermode::kHue_Mode, "Hue", kBasic_SrcType }, { SkXfermode::kSaturation_Mode, "Saturation", kBasic_SrcType }, { SkXfermode::kColor_Mode, "Color", kBasic_SrcType }, { SkXfermode::kLuminosity_Mode, "Luminosity", kBasic_SrcType }, }; const SkScalar w = SkIntToScalar(W); const SkScalar h = SkIntToScalar(H); SkMatrix m; m.setScale(SkIntToScalar(6), SkIntToScalar(6)); SkShader* s = SkShader::CreateBitmapShader(fBG, SkShader::kRepeat_TileMode, SkShader::kRepeat_TileMode, &m); SkPaint labelP; labelP.setAntiAlias(true); sk_tool_utils::set_portable_typeface(&labelP); labelP.setTextAlign(SkPaint::kCenter_Align); const int W = 5; SkScalar x0 = 0; SkScalar y0 = 0; for (int sourceType = 1; sourceType & kAll_SrcType; sourceType <<= 1) { 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); draw_mode(canvas, mode, static_cast(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); }