Use Color Processor for color bitmap text draws on gpu.

gm/colortypexfermode.cpp

+/*
+ * Copyright 2014 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 "SkGradientShader.h"
+#include "SkShader.h"
+#include "SkXfermode.h"
+#include "../src/fonts/SkGScalerContext.h"
+
+namespace skiagm {
+
+static uint16_t gData[] = { 0xFFFF, 0xCCCF, 0xCCCF, 0xFFFF };
+
+class ColorTypeXfermodeGM : public GM {
+    SkBitmap    fBG;
+
+    virtual void onOnceBeforeDraw() SK_OVERRIDE {
+        fBG.installPixels(SkImageInfo::Make(2, 2, kARGB_4444_SkColorType,
+                                            kOpaque_SkAlphaType), gData, 4);
+    }
+
+public:
+    const static int W = 64;
+    const static int H = 64;
+    ColorTypeXfermodeGM() {
+        const SkColor colors[] = {
+            SK_ColorRED, SK_ColorGREEN, SK_ColorBLUE,
+            SK_ColorMAGENTA, SK_ColorCYAN, SK_ColorYELLOW
+        };
+        SkMatrix local;
+        local.setRotate(180);
+        SkShader* s = SkGradientShader::CreateSweep(0,0, colors, NULL,
+                                                    SK_ARRAY_COUNT(colors), 0, &local);
+
+        SkPaint paint;
+        paint.setAntiAlias(true);
+        paint.setShader(s)->unref();
+
+        SkTypeface* orig = sk_tool_utils::create_portable_typeface("Times",
+                                                            SkTypeface::kBold);
+        if (NULL == orig) {
+            orig = SkTypeface::RefDefault();
+        }
+        fColorType = SkNEW_ARGS(SkGTypeface, (orig, paint));
+        orig->unref();
+    }
+
+    virtual ~ColorTypeXfermodeGM() {
+        fColorType->unref();
+    }
+
+protected:
+    virtual SkString onShortName() {
+        return SkString("colortype_xfermodes");
+    }
+
+    virtual SkISize onISize() {
+        return SkISize::Make(400, 640);
+    }
+
+    virtual void onDraw(SkCanvas* canvas) {
+        canvas->translate(SkIntToScalar(10), SkIntToScalar(20));
+
+        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::kModulate_Mode,     "Modulate"    },
+            { 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"   },
+            { SkXfermode::kMultiply_Mode,     "Multiply"    },
+            { SkXfermode::kHue_Mode,          "Hue"         },
+            { SkXfermode::kSaturation_Mode,   "Saturation"  },
+            { SkXfermode::kColor_Mode,        "Color"       },
+            { SkXfermode::kLuminosity_Mode,   "Luminosity"  },
+        };
+
+        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);
+
+        SkPaint textP;
+        textP.setAntiAlias(true);
+        textP.setTypeface(fColorType);
+        textP.setTextSize(SkIntToScalar(70));
+
+        const int W = 5;
+
+        SkScalar x0 = 0;
+        SkScalar y0 = 0;
+        SkScalar x = x0, y = y0;
+        for (size_t i = 0; i < SK_ARRAY_COUNT(gModes); i++) {
+            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);
+
+            r.inset(-SK_ScalarHalf, -SK_ScalarHalf);
+            p.setStyle(SkPaint::kStroke_Style);
+            p.setShader(NULL);
+            canvas->drawRect(r, p);
+
+            textP.setXfermode(mode);
+            canvas->drawText("H", 1, x+ w/10.f, y + 7.f*h/8.f, textP);
+#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);
+            }
+        }
+        s->unref();
+    }
+
+    virtual uint32_t onGetFlags() const {
+        return kSkipPipe_Flag | kSkipPicture_Flag;
+    }
+
+private:
+    SkTypeface* fColorType;
+
+    typedef GM INHERITED;
+};
+
+//////////////////////////////////////////////////////////////////////////////
+
+static GM* MyFactory(void*) { return new ColorTypeXfermodeGM; }
+static GMRegistry reg(MyFactory);
+
+}