Home | History | Annotate | Download | only in gm 
      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(sk_tool_utils::color_to_565(0xFFDDDDDD));
     52     }
     53 
     54 protected:
     55 
     56     SkString onShortName() override {
     57         return SkString("shadertext3");
     58     }
     59 
     60     SkISize onISize() override{ return SkISize::Make(800, 1000); }
     61 
     62     void onOnceBeforeDraw() override {
     63         makebm(&fBmp, kPointSize / 4, kPointSize / 4);
     64     }
     65 
     66     void onDraw(SkCanvas* canvas) 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 }
    140