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      1 /*
      2  * Copyright 2014 Google Inc.
      3  *
      4  * Use of this source code is governed by a BSD-style license that can be
      5  * found in the LICENSE file.
      6  */
      7 
      8 #include "gm.h"
      9 #include "SkCanvas.h"
     10 #include "SkColorFilter.h"
     11 #include "SkGradientShader.h"
     12 
     13 static SkShader* make_shader(const SkRect& bounds) {
     14     const SkPoint pts[] = {
     15         { bounds.left(), bounds.top() },
     16         { bounds.right(), bounds.bottom() },
     17     };
     18     const SkColor colors[] = {
     19         SK_ColorRED, SK_ColorGREEN, SK_ColorBLUE, SK_ColorBLACK,
     20         SK_ColorCYAN, SK_ColorMAGENTA, SK_ColorYELLOW,
     21     };
     22     return SkGradientShader::CreateLinear(pts,
     23                                           colors, NULL, SK_ARRAY_COUNT(colors),
     24                                           SkShader::kClamp_TileMode);
     25 }
     26 
     27 typedef void (*InstallPaint)(SkPaint*, uint32_t, uint32_t);
     28 
     29 static void install_nothing(SkPaint* paint, uint32_t, uint32_t) {
     30     paint->setColorFilter(NULL);
     31 }
     32 
     33 static void install_lighting(SkPaint* paint, uint32_t mul, uint32_t add) {
     34     paint->setColorFilter(SkColorFilter::CreateLightingFilter(mul, add))->unref();
     35 }
     36 
     37 class ColorFiltersGM : public skiagm::GM {
     38 public:
     39     ColorFiltersGM() {
     40         fName.set("lightingcolorfilter");
     41     }
     42 
     43 protected:
     44     virtual SkString onShortName() {
     45         return fName;
     46     }
     47 
     48     virtual SkISize onISize() {
     49         return SkISize::Make(640, 480);
     50     }
     51 
     52     virtual uint32_t onGetFlags() const SK_OVERRIDE {
     53         return kSkipTiled_Flag;
     54     }
     55 
     56     virtual void onDraw(SkCanvas* canvas) SK_OVERRIDE {
     57         SkPaint paint;
     58         SkRect r;
     59         r.setWH(600, 50);
     60         paint.setShader(make_shader(r))->unref();
     61 
     62         const struct {
     63             InstallPaint    fProc;
     64             uint32_t        fData0, fData1;
     65         } rec[] = {
     66             { install_nothing, 0, 0 },
     67             { install_lighting, 0xFF0000, 0 },
     68             { install_lighting, 0x00FF00, 0 },
     69             { install_lighting, 0x0000FF, 0 },
     70             { install_lighting, 0x000000, 0xFF0000 },
     71             { install_lighting, 0x000000, 0x00FF00 },
     72             { install_lighting, 0x000000, 0x0000FF },
     73         };
     74 
     75         canvas->translate(10, 10);
     76         for (size_t i = 0; i < SK_ARRAY_COUNT(rec); ++i) {
     77             rec[i].fProc(&paint, rec[i].fData0, rec[i].fData1);
     78             canvas->drawRect(r, paint);
     79             canvas->translate(0, r.height() + 10);
     80         }
     81     }
     82 
     83 private:
     84     SkString fName;
     85     typedef GM INHERITED;
     86 };
     87 
     88 
     89 //////////////////////////////////////////////////////////////////////////////
     90 
     91 DEF_GM( return SkNEW(ColorFiltersGM); )
     92