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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 "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 int kPointSize = 300;
     46 
     47 class ShaderText3GM : public GM {
     48 public:
     49     ShaderText3GM() {
     50         this->setBGColor(0xFFDDDDDD);
     51     }
     52 
     53 protected:
     54 
     55     SkString onShortName() override {
     56         return SkString("shadertext3");
     57     }
     58 
     59     SkISize onISize() override{ return SkISize::Make(820, 930); }
     60 
     61     void onOnceBeforeDraw() override {
     62         makebm(&fBmp, kPointSize / 4, kPointSize / 4);
     63     }
     64 
     65     void onDraw(SkCanvas* canvas) override {
     66 
     67         SkPaint bmpPaint;
     68         bmpPaint.setAntiAlias(true);
     69         bmpPaint.setFilterQuality(kLow_SkFilterQuality);
     70         bmpPaint.setAlphaf(0.5f);
     71         canvas->drawBitmap(fBmp, 5.f, 5.f, &bmpPaint);
     72 
     73         SkFont font(sk_tool_utils::create_portable_typeface(), SkIntToScalar(kPointSize));
     74         SkPaint outlinePaint;
     75         outlinePaint.setStyle(SkPaint::kStroke_Style);
     76         outlinePaint.setStrokeWidth(0.f);
     77 
     78         canvas->translate(15.f, 15.f);
     79 
     80         // draw glyphs scaled up
     81         canvas->scale(2.f, 2.f);
     82 
     83         constexpr SkShader::TileMode kTileModes[] = {
     84             SkShader::kRepeat_TileMode,
     85             SkShader::kMirror_TileMode,
     86         };
     87 
     88         // position the baseline of the first run
     89         canvas->translate(0.f, 0.75f * kPointSize);
     90 
     91         canvas->save();
     92         int i = 0;
     93         for (size_t tm0 = 0; tm0 < SK_ARRAY_COUNT(kTileModes); ++tm0) {
     94             for (size_t tm1 = 0; tm1 < SK_ARRAY_COUNT(kTileModes); ++tm1) {
     95                 SkMatrix localM;
     96                 localM.setTranslate(5.f, 5.f);
     97                 localM.postRotate(20);
     98                 localM.postScale(1.15f, .85f);
     99 
    100                 SkPaint fillPaint;
    101                 fillPaint.setAntiAlias(true);
    102                 fillPaint.setFilterQuality(kLow_SkFilterQuality);
    103                 fillPaint.setShader(SkShader::MakeBitmapShader(fBmp, kTileModes[tm0],
    104                                                                kTileModes[tm1], &localM));
    105 
    106                 constexpr char kText[] = "B";
    107                 canvas->drawString(kText, 0, 0, font, fillPaint);
    108                 canvas->drawString(kText, 0, 0, font, outlinePaint);
    109                 SkScalar w = font.measureText(kText, strlen(kText), kUTF8_SkTextEncoding);
    110                 canvas->translate(w + 10.f, 0.f);
    111                 ++i;
    112                 if (!(i % 2)) {
    113                     canvas->restore();
    114                     canvas->translate(0, 0.75f * kPointSize);
    115                     canvas->save();
    116                 }
    117             }
    118         }
    119         canvas->restore();
    120     }
    121 
    122 private:
    123     SkBitmap fBmp;
    124     typedef GM INHERITED;
    125 };
    126 
    127 ///////////////////////////////////////////////////////////////////////////////
    128 
    129 DEF_GM( return new ShaderText3GM; )
    130 }
    131