src/third_party/skia/gm/shadertext3.cpp

   1 /*
   2  * Copyright 2011 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 "SkGradientShader.h"
  11
  12 namespace skiagm {
  13
  14 static void makebm(SkBitmap* bm, int w, int h) {
  15     bm->allocN32Pixels(w, h);
  16     bm->eraseColor(SK_ColorTRANSPARENT);
  17
  18     SkCanvas    canvas(*bm);
  19     SkScalar    s = SkIntToScalar(SkMin32(w, h));
  20     static const SkPoint     kPts0[] = { { 0, 0 }, { s, s } };
  21     static const SkPoint     kPts1[] = { { s/2, 0 }, { s/2, s } };
  22     static const SkScalar    kPos[] = { 0, SK_Scalar1/2, SK_Scalar1 };
  23     static const SkColor kColors0[] = {0x80F00080, 0xF0F08000, 0x800080F0 };
  24     static const SkColor kColors1[] = {0xF08000F0, 0x8080F000, 0xF000F080 };
  25
  26
  27     SkPaint     paint;
  28
  29     paint.setShader(SkGradientShader::CreateLinear(kPts0, kColors0, kPos,
  30                     SK_ARRAY_COUNT(kColors0), SkShader::kClamp_TileMode))->unref();
  31     canvas.drawPaint(paint);
  32     paint.setShader(SkGradientShader::CreateLinear(kPts1, kColors1, kPos,
  33                     SK_ARRAY_COUNT(kColors1), SkShader::kClamp_TileMode))->unref();
  34     canvas.drawPaint(paint);
  35 }
  36
  37 ///////////////////////////////////////////////////////////////////////////////
  38
  39 struct LabeledMatrix {
  40     SkMatrix    fMatrix;
  41     const char* fLabel;
  42 };
  43
  44 static const char kText[] = "B";
  45 static const int kTextLen = SK_ARRAY_COUNT(kText) - 1;
  46 static const int kPointSize = 300;
  47
  48 class ShaderText3GM : public GM {
  49 public:
  50     ShaderText3GM() {
  51         this->setBGColor(0xFFDDDDDD);
  52     }
  53
  54 protected:
  55     virtual uint32_t onGetFlags() const SK_OVERRIDE {
  56         return kSkipTiled_Flag;
  57     }
  58
  59     virtual SkString onShortName() SK_OVERRIDE {
  60         return SkString("shadertext3");
  61     }
  62
  63     virtual SkISize onISize() SK_OVERRIDE{ return SkISize::Make(800, 1000); }
  64
  65     virtual void onOnceBeforeDraw() SK_OVERRIDE {
  66         makebm(&fBmp, kPointSize / 4, kPointSize / 4);
  67     }
  68
  69     virtual void onDraw(SkCanvas* canvas) SK_OVERRIDE {
  70
  71         SkPaint bmpPaint;
  72         bmpPaint.setAntiAlias(true);
  73         bmpPaint.setFilterLevel(SkPaint::kLow_FilterLevel);
  74         bmpPaint.setAlpha(0x80);
  75         canvas->drawBitmap(fBmp, 5.f, 5.f, &bmpPaint);
  76
  77         SkPaint outlinePaint;
  78         outlinePaint.setAntiAlias(true);
  79         sk_tool_utils::set_portable_typeface(&outlinePaint);
  80         outlinePaint.setTextSize(SkIntToScalar(kPointSize));
  81         outlinePaint.setStyle(SkPaint::kStroke_Style);
  82         outlinePaint.setStrokeWidth(0.f);
  83
  84         canvas->translate(15.f, 15.f);
  85
  86         // draw glyphs scaled up
  87         canvas->scale(2.f, 2.f);
  88
  89         static const SkShader::TileMode kTileModes[] = {
  90             SkShader::kRepeat_TileMode,
  91             SkShader::kMirror_TileMode,
  92         };
  93
  94         // position the baseline of the first run
  95         canvas->translate(0.f, 0.75f * kPointSize);
  96
  97         canvas->save();
  98         int i = 0;
  99         for (size_t tm0 = 0; tm0 < SK_ARRAY_COUNT(kTileModes); ++tm0) {
 100             for (size_t tm1 = 0; tm1 < SK_ARRAY_COUNT(kTileModes); ++tm1) {
 101                 SkMatrix localM;
 102                 localM.setTranslate(5.f, 5.f);
 103                 localM.postRotate(20);
 104                 localM.postScale(1.15f, .85f);
 105
 106                 SkAutoTUnref<SkShader> shader(SkShader::CreateBitmapShader(fBmp,
 107                                                                            kTileModes[tm0],
 108                                                                            kTileModes[tm1],
 109                                                                            &localM));
 110
 111                 SkPaint fillPaint;
 112                 fillPaint.setAntiAlias(true);
 113                 sk_tool_utils::set_portable_typeface(&fillPaint);
 114                 fillPaint.setTextSize(SkIntToScalar(kPointSize));
 115                 fillPaint.setFilterLevel(SkPaint::kLow_FilterLevel);
 116                 fillPaint.setShader(shader);
 117
 118                 canvas->drawText(kText, kTextLen, 0, 0, fillPaint);
 119                 canvas->drawText(kText, kTextLen, 0, 0, outlinePaint);
 120                 SkScalar w = fillPaint.measureText(kText, kTextLen);
 121                 canvas->translate(w + 10.f, 0.f);
 122                 ++i;
 123                 if (!(i % 2)) {
 124                     canvas->restore();
 125                     canvas->translate(0, 0.75f * kPointSize);
 126                     canvas->save();
 127                 }
 128             }
 129         }
 130         canvas->restore();
 131     }
 132
 133 private:
 134     SkBitmap fBmp;
 135     typedef GM INHERITED;
 136 };
 137
 138 ///////////////////////////////////////////////////////////////////////////////
 139
 140 static GM* MyFactory(void*) { return new ShaderText3GM; }
 141 static GMRegistry reg(MyFactory);
 142 }