text: /*
   * Copyright 2011 Google Inc.
   *
   * Use of this source code is governed by a BSD-style license that can be
   * found in the LICENSE file.
   */
  #include "gm.h"
  #include "sk_tool_utils.h"
  #include "SkColorFilter.h"
  #include "SkMaskFilter.h"
  #include "SkPath.h"
  #include "SkRegion.h"
  #include "SkShader.h"
  #include "SkTextUtils.h"
  #include "SkUTF.h"
  
  // effects
  #include "SkGradientShader.h"
  #include "SkBlurDrawLooper.h"
  
  static void makebm(SkBitmap* bm, SkColorType ct, int w, int h) {
      bm->allocPixels(SkImageInfo::Make(w, h, ct, kPremul_SkAlphaType));
      bm->eraseColor(SK_ColorTRANSPARENT);
  
      SkCanvas    canvas(*bm);
      SkPoint     pts[] = { { 0, 0 }, { SkIntToScalar(w), SkIntToScalar(h)} };
      SkColor     colors[] = { SK_ColorRED, SK_ColorGREEN, SK_ColorBLUE };
      SkScalar    pos[] = { 0, SK_Scalar1/2, SK_Scalar1 };
      SkPaint     paint;
  
      paint.setDither(true);
      paint.setShader(SkGradientShader::MakeLinear(pts, colors, pos,
                  SK_ARRAY_COUNT(colors), SkShader::kClamp_TileMode));
      canvas.drawPaint(paint);
  }
  
  static void setup(SkPaint* paint, const SkBitmap& bm, SkFilterQuality filter_level,
                    SkShader::TileMode tmx, SkShader::TileMode tmy) {
      paint->setShader(SkShader::MakeBitmapShader(bm, tmx, tmy));
      paint->setFilterQuality(filter_level);
  }
  
  constexpr SkColorType gColorTypes[] = {
      kN32_SkColorType,
      kRGB_565_SkColorType,
  };
  
  class ScaledTilingGM : public skiagm::GM {
  public:
      ScaledTilingGM(bool powerOfTwoSize)
              : fPowerOfTwoSize(powerOfTwoSize) {
      }
  
      SkBitmap    fTexture[SK_ARRAY_COUNT(gColorTypes)];
  
  protected:
      enum {
          kPOTSize = 4,
          kNPOTSize = 3,
      };
  
      SkString onShortName() override {
          SkString name("scaled_tilemodes");
          if (!fPowerOfTwoSize) {
              name.append("_npot");
          }
          return name;
      }
  
      SkISize onISize() override { return SkISize::Make(880, 760); }
  
      void onOnceBeforeDraw() override {
          int size = fPowerOfTwoSize ? kPOTSize : kNPOTSize;
          for (size_t i = 0; i < SK_ARRAY_COUNT(gColorTypes); i++) {
              makebm(&fTexture[i], gColorTypes[i], size, size);
          }
      }
  
      void onDraw(SkCanvas* canvas) override {
          SkPaint textPaint;
          SkFont font(sk_tool_utils::create_portable_typeface(), 12);
  
          float scale = 32.f/kPOTSize;
  
          int size = fPowerOfTwoSize ? kPOTSize : kNPOTSize;
  
          SkRect r = { 0, 0, SkIntToScalar(size*2), SkIntToScalar(size*2) };
  
          const char* gColorTypeNames[] = { "8888" , "565", "4444" };
  
          constexpr SkFilterQuality gFilterQualitys[] =
              { kNone_SkFilterQuality,
                kLow_SkFilterQuality,
                kMedium_SkFilterQuality,
                kHigh_SkFilterQuality };
          const char* gFilterNames[] = { "None", "Low", "Medium", "High" };
  
          constexpr SkShader::TileMode gModes[] = {
              SkShader::kClamp_TileMode, SkShader::kRepeat_TileMode, SkShader::kMirror_TileMode };
          const char* gModeNames[] = { "C", "R", "M" };
  
          SkScalar y = SkIntToScalar(24);
          SkScalar x = SkIntToScalar(10)/scale;
  
          for (size_t kx = 0; kx < SK_ARRAY_COUNT(gModes); kx++) {
              for (size_t ky = 0; ky < SK_ARRAY_COUNT(gModes); ky++) {
                  SkString str;
                  str.printf("[%s,%s]", gModeNames[kx], gModeNames[ky]);
  
                  SkTextUtils::DrawString(canvas, str.c_str(), scale*(x + r.width()/2), y, font, SkPaint(),
                                          SkTextUtils::kCenter_Align);
  
                  x += r.width() * 4 / 3;
              }
          }
  
          y = SkIntToScalar(40) / scale;
  
          for (size_t i = 0; i < SK_ARRAY_COUNT(gColorTypes); i++) {
              for (size_t j = 0; j < SK_ARRAY_COUNT(gFilterQualitys); j++) {
                  x = SkIntToScalar(10)/scale;
                  for (size_t kx = 0; kx < SK_ARRAY_COUNT(gModes); kx++) {
                      for (size_t ky = 0; ky < SK_ARRAY_COUNT(gModes); ky++) {
                          SkPaint paint;
  #if 1 // Temporary change to regen bitmap before each draw. This may help tracking down an issue
        // on SGX where resizing NPOT textures to POT textures exhibits a driver bug.
                          if (!fPowerOfTwoSize) {
                              makebm(&fTexture[i], gColorTypes[i], size, size);
                          }
  #endif
                          setup(&paint, fTexture[i], gFilterQualitys[j], gModes[kx], gModes[ky]);
                          paint.setDither(true);
  
                          canvas->save();
                          canvas->scale(scale,scale);
                          canvas->translate(x, y);
                          canvas->drawRect(r, paint);
                          canvas->restore();
  
                          x += r.width() * 4 / 3;
                      }
                  }
                  canvas->drawString(SkStringPrintf("%s, %s", gColorTypeNames[i], gFilterNames[j]),
                                     scale * x, scale * (y + r.height() * 2 / 3), font, textPaint);
  
                  y += r.height() * 4 / 3;
              }
          }
      }
  
  private:
      bool fPowerOfTwoSize;
      typedef skiagm::GM INHERITED;
  };
  
  constexpr int gWidth = 32;
  constexpr int gHeight = 32;
  
  static sk_sp<SkShader> make_bm(SkShader::TileMode tx, SkShader::TileMode ty) {
      SkBitmap bm;
      makebm(&bm, kN32_SkColorType, gWidth, gHeight);
      return SkShader::MakeBitmapShader(bm, tx, ty);
  }
  
  static sk_sp<SkShader> make_grad(SkShader::TileMode tx, SkShader::TileMode ty) {
      SkPoint pts[] = { { 0, 0 }, { SkIntToScalar(gWidth), SkIntToScalar(gHeight)} };
      SkPoint center = { SkIntToScalar(gWidth)/2, SkIntToScalar(gHeight)/2 };
      SkScalar rad = SkIntToScalar(gWidth)/2;
      SkColor colors[] = { 0xFFFF0000, sk_tool_utils::color_to_565(0xFF0044FF) };
  
      int index = (int)ty;
      switch (index % 3) {
          case 0:
              return SkGradientShader::MakeLinear(pts, colors, nullptr, SK_ARRAY_COUNT(colors), tx);
          case 1:
              return SkGradientShader::MakeRadial(center, rad, colors, nullptr, SK_ARRAY_COUNT(colors), tx);
          case 2:
              return SkGradientShader::MakeSweep(center.fX, center.fY, colors, nullptr, SK_ARRAY_COUNT(colors));
      }
  
      return nullptr;
  }
  
  typedef sk_sp<SkShader> (*ShaderProc)(SkShader::TileMode, SkShader::TileMode);
  
  class ScaledTiling2GM : public skiagm::GM {
      ShaderProc fProc;
      SkString   fName;
  public:
      ScaledTiling2GM(ShaderProc proc, const char name[]) : fProc(proc) {
          fName.printf("scaled_tilemode_%s", name);
      }
  
  protected:
  
      SkString onShortName() override {
          return fName;
      }
  
      SkISize onISize() override { return SkISize::Make(650, 610); }
  
      void onDraw(SkCanvas* canvas) override {
          canvas->scale(SkIntToScalar(3)/2, SkIntToScalar(3)/2);
  
          const SkScalar w = SkIntToScalar(gWidth);
          const SkScalar h = SkIntToScalar(gHeight);
          SkRect r = { -w, -h, w*2, h*2 };
  
          constexpr SkShader::TileMode gModes[] = {
              SkShader::kClamp_TileMode, SkShader::kRepeat_TileMode, SkShader::kMirror_TileMode
          };
          const char* gModeNames[] = {
              "Clamp", "Repeat", "Mirror"
          };
  
          SkScalar y = SkIntToScalar(24);
          SkScalar x = SkIntToScalar(66);
  
          SkFont font(sk_tool_utils::create_portable_typeface());
  
          for (size_t kx = 0; kx < SK_ARRAY_COUNT(gModes); kx++) {
              SkString str(gModeNames[kx]);
              SkTextUtils::DrawString(canvas, str.c_str(), x + r.width()/2, y, font, SkPaint(),
                                      SkTextUtils::kCenter_Align);
              x += r.width() * 4 / 3;
          }
  
          y += SkIntToScalar(16) + h;
  
          for (size_t ky = 0; ky < SK_ARRAY_COUNT(gModes); ky++) {
              x = SkIntToScalar(16) + w;
  
              SkString str(gModeNames[ky]);
              SkTextUtils::DrawString(canvas, str.c_str(), x, y + h/2, font, SkPaint(), SkTextUtils::kRight_Align);
  
              x += SkIntToScalar(50);
              for (size_t kx = 0; kx < SK_ARRAY_COUNT(gModes); kx++) {
                  SkPaint paint;
                  paint.setShader(fProc(gModes[kx], gModes[ky]));
  
                  canvas->save();
                  canvas->translate(x, y);
                  canvas->drawRect(r, paint);
                  canvas->restore();
  
                  x += r.width() * 4 / 3;
              }
              y += r.height() * 4 / 3;
          }
      }
  
  private:
      typedef skiagm::GM INHERITED;
  };
  
  //////////////////////////////////////////////////////////////////////////////
  
  DEF_GM( return new ScaledTilingGM(true); )
  DEF_GM( return new ScaledTilingGM(false); )
  DEF_GM( return new ScaledTiling2GM(make_bm, "bitmap"); )
  DEF_GM( return new ScaledTiling2GM(make_grad, "gradient"); )
  