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
  56     SkString onShortName() SK_OVERRIDE {
  57         return SkString("shadertext3");
  58     }
  59
  60     SkISize onISize() SK_OVERRIDE{ return SkISize::Make(800, 1000); }
  61
  62     void onOnceBeforeDraw() SK_OVERRIDE {
  63         makebm(&fBmp, kPointSize / 4, kPointSize / 4);
  64     }
  65
  66     void onDraw(SkCanvas* canvas) SK_OVERRIDE {
  67
  68         SkPaint bmpPaint;
  69         bmpPaint.setAntiAlias(true);
  70         bmpPaint.setFilterQuality(kLow_SkFilterQuality);
  71         bmpPaint.setAlpha(0x80);
  72         canvas->drawBitmap(fBmp, 5.f, 5.f, &bmpPaint);
  73
  74         SkPaint outlinePaint;
  75         outlinePaint.setAntiAlias(true);
  76         sk_tool_utils::set_portable_typeface(&outlinePaint);
  77         outlinePaint.setTextSize(SkIntToScalar(kPointSize));
  78         outlinePaint.setStyle(SkPaint::kStroke_Style);
  79         outlinePaint.setStrokeWidth(0.f);
  80
  81         canvas->translate(15.f, 15.f);
  82
  83         // draw glyphs scaled up
  84         canvas->scale(2.f, 2.f);
  85
  86         static const SkShader::TileMode kTileModes[] = {
  87             SkShader::kRepeat_TileMode,
  88             SkShader::kMirror_TileMode,
  89         };
  90
  91         // position the baseline of the first run
  92         canvas->translate(0.f, 0.75f * kPointSize);
  93
  94         canvas->save();
  95         int i = 0;
  96         for (size_t tm0 = 0; tm0 < SK_ARRAY_COUNT(kTileModes); ++tm0) {
  97             for (size_t tm1 = 0; tm1 < SK_ARRAY_COUNT(kTileModes); ++tm1) {
  98                 SkMatrix localM;
  99                 localM.setTranslate(5.f, 5.f);
 100                 localM.postRotate(20);
 101                 localM.postScale(1.15f, .85f);
 102
 103                 SkAutoTUnref<SkShader> shader(SkShader::CreateBitmapShader(fBmp,
 104                                                                            kTileModes[tm0],
 105                                                                            kTileModes[tm1],
 106                                                                            &localM));
 107
 108                 SkPaint fillPaint;
 109                 fillPaint.setAntiAlias(true);
 110                 sk_tool_utils::set_portable_typeface(&fillPaint);
 111                 fillPaint.setTextSize(SkIntToScalar(kPointSize));
 112                 fillPaint.setFilterQuality(kLow_SkFilterQuality);
 113                 fillPaint.setShader(shader);
 114
 115                 canvas->drawText(kText, kTextLen, 0, 0, fillPaint);
 116                 canvas->drawText(kText, kTextLen, 0, 0, outlinePaint);
 117                 SkScalar w = fillPaint.measureText(kText, kTextLen);
 118                 canvas->translate(w + 10.f, 0.f);
 119                 ++i;
 120                 if (!(i % 2)) {
 121                     canvas->restore();
 122                     canvas->translate(0, 0.75f * kPointSize);
 123                     canvas->save();
 124                 }
 125             }
 126         }
 127         canvas->restore();
 128     }
 129
 130 private:
 131     SkBitmap fBmp;
 132     typedef GM INHERITED;
 133 };
 134
 135 ///////////////////////////////////////////////////////////////////////////////
 136
 137 static GM* MyFactory(void*) { return new ShaderText3GM; }
 138 static GMRegistry reg(MyFactory);
 139 }