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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 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 }
    137