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      1 
      2 /*
      3  * Copyright 2011 Google Inc.
      4  *
      5  * Use of this source code is governed by a BSD-style license that can be
      6  * found in the LICENSE file.
      7  */
      8 #include "SampleCode.h"
      9 #include "SkView.h"
     10 #include "SkCanvas.h"
     11 #include "SkGradientShader.h"
     12 #include "SkPath.h"
     13 #include "SkRegion.h"
     14 #include "SkShader.h"
     15 #include "SkUtils.h"
     16 #include "Sk1DPathEffect.h"
     17 #include "SkCornerPathEffect.h"
     18 #include "SkPathMeasure.h"
     19 #include "SkRandom.h"
     20 #include "SkColorPriv.h"
     21 #include "SkColorFilter.h"
     22 #include "SkDither.h"
     23 #include "sk_tool_utils.h"
     24 
     25 static void make_bm(SkBitmap* bm) {
     26     const SkPMColor colors[] = {
     27         SkPreMultiplyColor(SK_ColorRED), SkPreMultiplyColor(SK_ColorGREEN),
     28         SkPreMultiplyColor(SK_ColorBLUE), SkPreMultiplyColor(SK_ColorWHITE)
     29     };
     30     SkColorTable* ctable = new SkColorTable(colors, 4);
     31     bm->allocPixels(SkImageInfo::Make(2, 2, kIndex_8_SkColorType,
     32                                       kOpaque_SkAlphaType),
     33                     NULL, ctable);
     34     ctable->unref();
     35 
     36     *bm->getAddr8(0, 0) = 0;
     37     *bm->getAddr8(1, 0) = 1;
     38     *bm->getAddr8(0, 1) = 2;
     39     *bm->getAddr8(1, 1) = 3;
     40 }
     41 
     42 static SkScalar draw_bm(SkCanvas* canvas, const SkBitmap& bm,
     43                         SkScalar x, SkScalar y, SkPaint* paint) {
     44     canvas->drawBitmap(bm, x, y, paint);
     45     return SkIntToScalar(bm.width()) * 5/4;
     46 }
     47 
     48 static SkScalar draw_set(SkCanvas* c, const SkBitmap& bm, SkScalar x, SkPaint* p) {
     49     x += draw_bm(c, bm, x, 0, p);
     50     p->setFilterLevel(SkPaint::kLow_FilterLevel);
     51     x += draw_bm(c, bm, x, 0, p);
     52     p->setDither(true);
     53     return x + draw_bm(c, bm, x, 0, p);
     54 }
     55 
     56 static SkScalar draw_row(SkCanvas* canvas, const SkBitmap& bm) {
     57     SkAutoCanvasRestore acr(canvas, true);
     58 
     59     SkPaint paint;
     60     SkScalar x = 0;
     61     const int scale = 32;
     62 
     63     paint.setAntiAlias(true);
     64     const char* name = sk_tool_utils::colortype_name(bm.colorType());
     65     canvas->drawText(name, strlen(name), x, SkIntToScalar(bm.height())*scale*5/8,
     66                      paint);
     67     canvas->translate(SkIntToScalar(48), 0);
     68 
     69     canvas->scale(SkIntToScalar(scale), SkIntToScalar(scale));
     70 
     71     x += draw_set(canvas, bm, 0, &paint);
     72     paint.reset();
     73     paint.setAlpha(0x80);
     74     draw_set(canvas, bm, x, &paint);
     75     return x * scale / 3;
     76 }
     77 
     78 class FilterView : public SampleView {
     79 public:
     80     SkBitmap    fBM8, fBM4444, fBM16, fBM32;
     81 
     82     FilterView() {
     83         make_bm(&fBM8);
     84         fBM8.copyTo(&fBM4444, kARGB_4444_SkColorType);
     85         fBM8.copyTo(&fBM16, kRGB_565_SkColorType);
     86         fBM8.copyTo(&fBM32, kN32_SkColorType);
     87 
     88         this->setBGColor(0xFFDDDDDD);
     89     }
     90 
     91 protected:
     92     // overrides from SkEventSink
     93     virtual bool onQuery(SkEvent* evt) {
     94         if (SampleCode::TitleQ(*evt)) {
     95             SampleCode::TitleR(evt, "Filter");
     96             return true;
     97         }
     98         return this->INHERITED::onQuery(evt);
     99     }
    100 
    101     virtual void onDrawContent(SkCanvas* canvas) {
    102         SkScalar x = SkIntToScalar(10);
    103         SkScalar y = SkIntToScalar(10);
    104 
    105         canvas->translate(x, y);
    106         y = draw_row(canvas, fBM8);
    107         canvas->translate(0, y);
    108         y = draw_row(canvas, fBM4444);
    109         canvas->translate(0, y);
    110         y = draw_row(canvas, fBM16);
    111         canvas->translate(0, y);
    112         draw_row(canvas, fBM32);
    113     }
    114 
    115 private:
    116     typedef SampleView INHERITED;
    117 };
    118 
    119 //////////////////////////////////////////////////////////////////////////////
    120 
    121 static SkView* MyFactory() { return new FilterView; }
    122 static SkViewRegister reg(MyFactory);
    123