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      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         outlinePaint.setTextSize(SkIntToScalar(kPointSize));
     80         outlinePaint.setStyle(SkPaint::kStroke_Style);
     81         outlinePaint.setStrokeWidth(0.f);
     82 
     83         canvas->translate(15.f, 15.f);
     84 
     85         // draw glyphs scaled up
     86         canvas->scale(2.f, 2.f);
     87 
     88         static const SkShader::TileMode kTileModes[] = {
     89             SkShader::kRepeat_TileMode,
     90             SkShader::kMirror_TileMode,
     91         };
     92 
     93         // position the baseline of the first run
     94         canvas->translate(0.f, 0.75f * kPointSize);
     95 
     96         canvas->save();
     97         int i = 0;
     98         for (size_t tm0 = 0; tm0 < SK_ARRAY_COUNT(kTileModes); ++tm0) {
     99             for (size_t tm1 = 0; tm1 < SK_ARRAY_COUNT(kTileModes); ++tm1) {
    100                 SkMatrix localM;
    101                 localM.setTranslate(5.f, 5.f);
    102                 localM.postRotate(20);
    103                 localM.postScale(1.15f, .85f);
    104 
    105                 SkAutoTUnref<SkShader> shader(SkShader::CreateBitmapShader(fBmp,
    106                                                                            kTileModes[tm0],
    107                                                                            kTileModes[tm1],
    108                                                                            &localM));
    109 
    110                 SkPaint fillPaint;
    111                 fillPaint.setAntiAlias(true);
    112                 fillPaint.setTextSize(SkIntToScalar(kPointSize));
    113                 fillPaint.setFilterLevel(SkPaint::kLow_FilterLevel);
    114                 fillPaint.setShader(shader);
    115 
    116                 canvas->drawText(kText, kTextLen, 0, 0, fillPaint);
    117                 canvas->drawText(kText, kTextLen, 0, 0, outlinePaint);
    118                 SkScalar w = fillPaint.measureText(kText, kTextLen);
    119                 canvas->translate(w + 10.f, 0.f);
    120                 ++i;
    121                 if (!(i % 2)) {
    122                     canvas->restore();
    123                     canvas->translate(0, 0.75f * kPointSize);
    124                     canvas->save();
    125                 }
    126             }
    127         }
    128         canvas->restore();
    129     }
    130 
    131 private:
    132     SkBitmap fBmp;
    133     typedef GM INHERITED;
    134 };
    135 
    136 ///////////////////////////////////////////////////////////////////////////////
    137 
    138 static GM* MyFactory(void*) { return new ShaderText3GM; }
    139 static GMRegistry reg(MyFactory);
    140 }
    141