Code drop from //branches/cupcake/...@124589

1 files changed, 266 insertions, 0 deletions

diff --git a/Samples/SampleXfermodes.cpp b/Samples/SampleXfermodes.cpp
new file mode 100644
index 0000000..5a05fc8
--- /dev/null
+++ b/Samples/SampleXfermodes.cpp
@@ -0,0 +1,266 @@
+#include "SampleCode.h"
+#include "SkView.h"
+#include "SkCanvas.h"
+#include "Sk64.h"
+#include "SkCornerPathEffect.h"
+#include "SkGradientShader.h"
+#include "SkGraphics.h"
+#include "SkImageDecoder.h"
+#include "SkKernel33MaskFilter.h"
+#include "SkPath.h"
+#include "SkRandom.h"
+#include "SkRegion.h"
+#include "SkShader.h"
+#include "SkUtils.h"
+#include "SkShaderExtras.h"
+#include "SkColorPriv.h"
+#include "SkColorFilter.h"
+#include "SkTime.h"
+#include "SkTypeface.h"
+#include "SkXfermode.h"
+
+#include "SkStream.h"
+#include "SkXMLParser.h"
+#include "SkColorPriv.h"
+#include "SkImageDecoder.h"
+
+static int newscale(U8CPU a, U8CPU b, int shift) {
+    unsigned prod = a * b + (1 << (shift - 1));
+    return (prod + (prod >> shift)) >> shift;
+}
+
+static void test_srcover565(SkCanvas* canvas) {
+    const int width = 32;
+    SkBitmap bm1, bm2, bm3;
+    bm1.setConfig(SkBitmap::kRGB_565_Config, width, 256); bm1.allocPixels(NULL);
+    bm2.setConfig(SkBitmap::kRGB_565_Config, width, 256); bm2.allocPixels(NULL);
+    bm3.setConfig(SkBitmap::kRGB_565_Config, width, 256); bm3.allocPixels(NULL);
+    
+    int rgb = 0x18;
+    int r = rgb >> 3;
+    int g = rgb >> 2;
+    uint16_t dst = SkPackRGB16(r, g, r);
+    for (int alpha = 0; alpha <= 255; alpha++) {
+        SkPMColor pm = SkPreMultiplyARGB(alpha, rgb, rgb, rgb);
+        uint16_t newdst = SkSrcOver32To16(pm, dst);
+        sk_memset16(bm1.getAddr16(0, alpha), newdst, bm1.width());
+        
+        int ia = 255 - alpha;
+        int iscale = SkAlpha255To256(ia);
+        int dr = (SkGetPackedR32(pm) + (r * iscale >> 5)) >> 3;
+        int dg = (SkGetPackedG32(pm) + (g * iscale >> 6)) >> 2;
+
+        sk_memset16(bm2.getAddr16(0, alpha), SkPackRGB16(dr, dg, dr), bm2.width());
+
+        int dr2 = (SkMulDiv255Round(alpha, rgb) + newscale(r, ia, 5)) >> 3;
+        int dg2 = (SkMulDiv255Round(alpha, rgb) + newscale(g, ia, 6)) >> 2;
+        
+        sk_memset16(bm3.getAddr16(0, alpha), SkPackRGB16(dr2, dg2, dr2), bm3.width());
+
+//        if (mr != dr || mg != dg)
+        {
+//            SkDebugf("[%d] macro [%d %d] inline [%d %d] new [%d %d]\n", alpha, mr, mg, dr, dg, dr2, dg2);
+        }
+    }
+    
+    SkScalar dx = SkIntToScalar(width+4);
+    
+    canvas->drawBitmap(bm1, 0, 0, NULL); canvas->translate(dx, 0);
+    canvas->drawBitmap(bm2, 0, 0, NULL); canvas->translate(dx, 0);
+    canvas->drawBitmap(bm3, 0, 0, NULL); canvas->translate(dx, 0);
+    
+    SkRect rect = { 0, 0, SkIntToScalar(bm1.width()), SkIntToScalar(bm1.height()) };
+    SkPaint p;
+    p.setARGB(0xFF, rgb, rgb, rgb);
+    canvas->drawRect(rect, p);
+}
+
+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 XfermodesView : public SkView {
+    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:
+	XfermodesView() {
+        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:
+    // overrides from SkEventSink
+    virtual bool onQuery(SkEvent* evt) {
+        if (SampleCode::TitleQ(*evt)) {
+            SampleCode::TitleR(evt, "Xfermodes");
+            return true;
+        }
+        return this->INHERITED::onQuery(evt);
+    }
+
+    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);
+        
+        if (false) {
+            test_srcover565(canvas);
+        }
+        
+        if (false) {
+            SkPaint paint;
+            paint.setFlags(0x43);
+            paint.setTextSize(SkIntToScalar(128));
+            SkMatrix matrix;
+            matrix.reset();
+            matrix.set(0, 0x0019d049);
+            matrix.set(2, 0x712cf400);
+            matrix.set(4, 0x0019c96f);
+            matrix.set(5, 0xF8d76598);
+            canvas->concat(matrix);
+            canvas->drawText("HamburgefonsHamburgefonsHamburgefonsHamburgefons",
+                             48, 0, 0, paint);
+            return;
+        }
+
+        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);
+
+                canvas->drawText(gModes[i].fLabel, strlen(gModes[i].fLabel),
+                                 x + w/2, y - labelP.getTextSize()/2, labelP);
+
+                x += w + SkIntToScalar(10);
+                if ((i & 3) == 3) {
+                    x = x0;
+                    y += h + SkIntToScalar(30);
+                }
+            }
+            x0 += SkIntToScalar(330);
+        }
+        s->unref();
+    }
+
+private:
+    typedef SkView INHERITED;
+};
+
+//////////////////////////////////////////////////////////////////////////////
+
+static SkView* MyFactory() { return new XfermodesView; }
+static SkViewRegister reg(MyFactory);
+