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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 #include "gm.h"
      8 #include "SkCanvas.h"
      9 #include "SkGradientShader.h"
     10 #include "SkUnitMappers.h"
     11 
     12 namespace skiagm {
     13 
     14 static void makebm(SkBitmap* bm, SkBitmap::Config config, int w, int h) {
     15     bm->setConfig(config, w, h);
     16     bm->allocPixels();
     17     bm->eraseColor(SK_ColorTRANSPARENT);
     18 
     19     SkCanvas    canvas(*bm);
     20     SkScalar    s = SkIntToScalar(SkMin32(w, h));
     21     static const SkPoint     kPts0[] = { { 0, 0 }, { s, s } };
     22     static const SkPoint     kPts1[] = { { s/2, 0 }, { s/2, s } };
     23     static const SkScalar    kPos[] = { 0, SK_Scalar1/2, SK_Scalar1 };
     24     static const SkColor kColors0[] = {0x80F00080, 0xF0F08000, 0x800080F0 };
     25     static const SkColor kColors1[] = {0xF08000F0, 0x8080F000, 0xF000F080 };
     26 
     27 
     28     SkPaint     paint;
     29 
     30     SkUnitMapper*   um = NULL;
     31 
     32     um = new SkCosineMapper;
     33 
     34     SkAutoUnref au(um);
     35 
     36     paint.setShader(SkGradientShader::CreateLinear(kPts0, kColors0, kPos,
     37                     SK_ARRAY_COUNT(kColors0), SkShader::kClamp_TileMode, um))->unref();
     38     canvas.drawPaint(paint);
     39     paint.setShader(SkGradientShader::CreateLinear(kPts1, kColors1, kPos,
     40                     SK_ARRAY_COUNT(kColors1), SkShader::kClamp_TileMode))->unref();
     41     canvas.drawPaint(paint);
     42 }
     43 
     44 ///////////////////////////////////////////////////////////////////////////////
     45 
     46 struct LabeledMatrix {
     47     SkMatrix    fMatrix;
     48     const char* fLabel;
     49 };
     50 
     51 class ShaderText3GM : public GM {
     52 public:
     53     ShaderText3GM() {
     54         this->setBGColor(0xFFDDDDDD);
     55     }
     56 
     57 protected:
     58 
     59     SkString onShortName() {
     60         return SkString("shadertext3");
     61     }
     62 
     63     SkISize onISize() { return make_isize(800, 1000); }
     64 
     65     virtual void onDraw(SkCanvas* canvas) {
     66         static const char kText[] = "B";
     67         static const int kTextLen = SK_ARRAY_COUNT(kText) - 1;
     68         static const int kPointSize = 300;
     69 
     70         static SkBitmap bmp;
     71         if (bmp.isNull()) {
     72             makebm(&bmp, SkBitmap::kARGB_8888_Config, kPointSize / 4, kPointSize / 4);
     73         }
     74 
     75         SkPaint bmpPaint;
     76         bmpPaint.setAntiAlias(true);
     77         bmpPaint.setFilterLevel(SkPaint::kLow_FilterLevel);
     78         bmpPaint.setAlpha(0x80);
     79         canvas->drawBitmap(bmp, 5.f, 5.f, &bmpPaint);
     80 
     81         SkPaint outlinePaint;
     82         outlinePaint.setAntiAlias(true);
     83         outlinePaint.setTextSize(SkIntToScalar(kPointSize));
     84         outlinePaint.setStyle(SkPaint::kStroke_Style);
     85         outlinePaint.setStrokeWidth(0.f);
     86 
     87         canvas->translate(15.f, 15.f);
     88 
     89         // draw glyphs scaled up
     90         canvas->scale(2.f, 2.f);
     91 
     92         static const SkShader::TileMode kTileModes[] = {
     93             SkShader::kRepeat_TileMode,
     94             SkShader::kMirror_TileMode,
     95         };
     96 
     97         // position the baseline of the first run
     98         canvas->translate(0.f, 0.75f * kPointSize);
     99 
    100         canvas->save();
    101         int i = 0;
    102         for (size_t tm0 = 0; tm0 < SK_ARRAY_COUNT(kTileModes); ++tm0) {
    103             for (size_t tm1 = 0; tm1 < SK_ARRAY_COUNT(kTileModes); ++tm1) {
    104                 SkAutoTUnref<SkShader> shader(SkShader::CreateBitmapShader(bmp,
    105                                                                            kTileModes[tm0],
    106                                                                            kTileModes[tm1]));
    107                 SkMatrix localM;
    108                 localM.setTranslate(5.f, 5.f);
    109                 localM.postRotate(20);
    110                 localM.postScale(1.15f, .85f);
    111                 shader->setLocalMatrix(localM);
    112 
    113                 SkPaint fillPaint;
    114                 fillPaint.setAntiAlias(true);
    115                 fillPaint.setTextSize(SkIntToScalar(kPointSize));
    116                 fillPaint.setFilterLevel(SkPaint::kLow_FilterLevel);
    117                 fillPaint.setShader(shader);
    118 
    119                 canvas->drawText(kText, kTextLen, 0, 0, fillPaint);
    120                 canvas->drawText(kText, kTextLen, 0, 0, outlinePaint);
    121                 SkScalar w = fillPaint.measureText(kText, kTextLen);
    122                 canvas->translate(w + 10.f, 0.f);
    123                 ++i;
    124                 if (!(i % 2)) {
    125                     canvas->restore();
    126                     canvas->translate(0, 0.75f * kPointSize);
    127                     canvas->save();
    128                 }
    129             }
    130         }
    131         canvas->restore();
    132     }
    133 
    134 private:
    135     typedef GM INHERITED;
    136 };
    137 
    138 ///////////////////////////////////////////////////////////////////////////////
    139 
    140 #ifndef SK_BUILD_FOR_ANDROID
    141 static GM* MyFactory(void*) { return new ShaderText3GM; }
    142 static GMRegistry reg(MyFactory);
    143 #endif
    144 }
    145