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 "sk_tool_utils.h"
  10 #include "SkCanvas.h"
  11 #include "SkGradientShader.h"
  12
  13 namespace skiagm {
  14
  15 static void makebm(SkBitmap* bm, int w, int h) {
  16     bm->allocN32Pixels(w, h);
  17     bm->eraseColor(SK_ColorTRANSPARENT);
  18
  19     SkCanvas    canvas(*bm);
  20     SkScalar    s = SkIntToScalar(SkMin32(w, h));
  21     const SkPoint     kPts0[] = { { 0, 0 }, { s, s } };
  22     const SkPoint     kPts1[] = { { s/2, 0 }, { s/2, s } };
  23     const SkScalar    kPos[] = { 0, SK_Scalar1/2, SK_Scalar1 };
  24     const SkColor kColors0[] = {0x80F00080, 0xF0F08000, 0x800080F0 };
  25     const SkColor kColors1[] = {0xF08000F0, 0x8080F000, 0xF000F080 };
  26
  27
  28     SkPaint     paint;
  29
  30     paint.setShader(SkGradientShader::MakeLinear(kPts0, kColors0, kPos,
  31                     SK_ARRAY_COUNT(kColors0), SkShader::kClamp_TileMode));
  32     canvas.drawPaint(paint);
  33     paint.setShader(SkGradientShader::MakeLinear(kPts1, kColors1, kPos,
  34                     SK_ARRAY_COUNT(kColors1), SkShader::kClamp_TileMode));
  35     canvas.drawPaint(paint);
  36 }
  37
  38 ///////////////////////////////////////////////////////////////////////////////
  39
  40 struct LabeledMatrix {
  41     SkMatrix    fMatrix;
  42     const char* fLabel;
  43 };
  44
  45 constexpr char kText[] = "B";
  46 constexpr int kTextLen = SK_ARRAY_COUNT(kText) - 1;
  47 constexpr int kPointSize = 300;
  48
  49 class ShaderText3GM : public GM {
  50 public:
  51     ShaderText3GM() {
  52         this->setBGColor(sk_tool_utils::color_to_565(0xFFDDDDDD));
  53     }
  54
  55 protected:
  56
  57     SkString onShortName() override {
  58         return SkString("shadertext3");
  59     }
  60
  61     SkISize onISize() override{ return SkISize::Make(820, 930); }
  62
  63     void onOnceBeforeDraw() override {
  64         makebm(&fBmp, kPointSize / 4, kPointSize / 4);
  65     }
  66
  67     void onDraw(SkCanvas* canvas) override {
  68
  69         SkPaint bmpPaint;
  70         bmpPaint.setAntiAlias(true);
  71         bmpPaint.setFilterQuality(kLow_SkFilterQuality);
  72         bmpPaint.setAlpha(0x80);
  73         canvas->drawBitmap(fBmp, 5.f, 5.f, &bmpPaint);
  74
  75         SkPaint outlinePaint;
  76         outlinePaint.setAntiAlias(true);
  77         sk_tool_utils::set_portable_typeface(&outlinePaint);
  78         outlinePaint.setTextSize(SkIntToScalar(kPointSize));
  79         outlinePaint.setStyle(SkPaint::kStroke_Style);
  80         outlinePaint.setStrokeWidth(0.f);
  81
  82         canvas->translate(15.f, 15.f);
  83
  84         // draw glyphs scaled up
  85         canvas->scale(2.f, 2.f);
  86
  87         constexpr SkShader::TileMode kTileModes[] = {
  88             SkShader::kRepeat_TileMode,
  89             SkShader::kMirror_TileMode,
  90         };
  91
  92         // position the baseline of the first run
  93         canvas->translate(0.f, 0.75f * kPointSize);
  94
  95         canvas->save();
  96         int i = 0;
  97         for (size_t tm0 = 0; tm0 < SK_ARRAY_COUNT(kTileModes); ++tm0) {
  98             for (size_t tm1 = 0; tm1 < SK_ARRAY_COUNT(kTileModes); ++tm1) {
  99                 SkMatrix localM;
 100                 localM.setTranslate(5.f, 5.f);
 101                 localM.postRotate(20);
 102                 localM.postScale(1.15f, .85f);
 103
 104                 SkPaint fillPaint;
 105                 fillPaint.setAntiAlias(true);
 106                 sk_tool_utils::set_portable_typeface(&fillPaint);
 107                 fillPaint.setTextSize(SkIntToScalar(kPointSize));
 108                 fillPaint.setFilterQuality(kLow_SkFilterQuality);
 109                 fillPaint.setShader(SkShader::MakeBitmapShader(fBmp, kTileModes[tm0],
 110                                                                kTileModes[tm1], &localM));
 111
 112                 canvas->drawText(kText, kTextLen, 0, 0, fillPaint);
 113                 canvas->drawText(kText, kTextLen, 0, 0, outlinePaint);
 114                 SkScalar w = fillPaint.measureText(kText, kTextLen);
 115                 canvas->translate(w + 10.f, 0.f);
 116                 ++i;
 117                 if (!(i % 2)) {
 118                     canvas->restore();
 119                     canvas->translate(0, 0.75f * kPointSize);
 120                     canvas->save();
 121                 }
 122             }
 123         }
 124         canvas->restore();
 125     }
 126
 127 private:
 128     SkBitmap fBmp;
 129     typedef GM INHERITED;
 130 };
 131
 132 ///////////////////////////////////////////////////////////////////////////////
 133
 134 static GM* MyFactory(void*) { return new ShaderText3GM; }
 135 static GMRegistry reg(MyFactory);
 136 }