text: /*
   * Copyright 2014 Google Inc.
   *
   * Use of this source code is governed by a BSD-style license that can be
   * found in the LICENSE file.
   */
  
  // This test only works with the GPU backend.
  
  #include "gm.h"
  
  #if SK_SUPPORT_GPU
  
  #include "GrContext.h"
  #include "GrRenderTargetContextPriv.h"
  #include "SkBitmap.h"
  #include "SkGr.h"
  #include "SkGradientShader.h"
  #include "effects/GrTextureDomain.h"
  #include "ops/GrDrawOp.h"
  #include "ops/GrNonAAFillRectOp.h"
  
  namespace skiagm {
  /**
   * This GM directly exercises GrTextureDomainEffect.
   */
  class TextureDomainEffect : public GM {
  public:
      TextureDomainEffect() {
          this->setBGColor(0xFFFFFFFF);
      }
  
  protected:
      SkString onShortName() override {
          return SkString("texture_domain_effect");
      }
  
      SkISize onISize() override {
          const SkScalar canvasWidth = kDrawPad +
                  (kTargetWidth + 2 * kDrawPad) * GrTextureDomain::kModeCount +
                  kTestPad * GrTextureDomain::kModeCount;
          return SkISize::Make(SkScalarCeilToInt(canvasWidth), 800);
      }
  
      void onOnceBeforeDraw() override {
          // TODO: do this with surfaces & images and gpu backend
          SkImageInfo ii = SkImageInfo::Make(kTargetWidth, kTargetHeight, kN32_SkColorType,
                                             kPremul_SkAlphaType);
          fBmp.allocPixels(ii);
          SkCanvas canvas(fBmp);
          canvas.clear(0x00000000);
          SkPaint paint;
  
          SkColor colors1[] = { SK_ColorCYAN, SK_ColorLTGRAY, SK_ColorGRAY };
          paint.setShader(SkGradientShader::MakeSweep(65.f, 75.f, colors1, nullptr,
                                                      SK_ARRAY_COUNT(colors1)));
          canvas.drawOval(SkRect::MakeXYWH(-5.f, -5.f, fBmp.width() + 10.f, fBmp.height() + 10.f),
                          paint);
  
          SkColor colors2[] = { SK_ColorMAGENTA, SK_ColorLTGRAY, SK_ColorYELLOW };
          paint.setShader(SkGradientShader::MakeSweep(45.f, 55.f, colors2, nullptr,
                                                      SK_ARRAY_COUNT(colors2)));
          paint.setBlendMode(SkBlendMode::kDarken);
          canvas.drawOval(SkRect::MakeXYWH(-5.f, -5.f, fBmp.width() + 10.f, fBmp.height() + 10.f),
                          paint);
  
          SkColor colors3[] = { SK_ColorBLUE, SK_ColorLTGRAY, SK_ColorGREEN };
          paint.setShader(SkGradientShader::MakeSweep(25.f, 35.f, colors3, nullptr,
                                                      SK_ARRAY_COUNT(colors3)));
          paint.setBlendMode(SkBlendMode::kLighten);
          canvas.drawOval(SkRect::MakeXYWH(-5.f, -5.f, fBmp.width() + 10.f, fBmp.height() + 10.f),
                          paint);
      }
  
      void onDraw(SkCanvas* canvas) override {
          GrRenderTargetContext* renderTargetContext =
              canvas->internal_private_accessTopLayerRenderTargetContext();
          if (!renderTargetContext) {
              skiagm::GM::DrawGpuOnlyMessage(canvas);
              return;
          }
  
          GrContext* context = canvas->getGrContext();
          if (!context) {
              return;
          }
  
          GrSurfaceDesc desc;
          desc.fWidth = fBmp.width();
          desc.fHeight = fBmp.height();
          desc.fConfig = SkImageInfo2GrPixelConfig(fBmp.info(), *context->caps());
  
          sk_sp<GrTextureProxy> proxy(GrSurfaceProxy::MakeDeferred(context->resourceProvider(),
                                                                   desc, SkBudgeted::kYes,
                                                                   fBmp.getPixels(),
                                                                   fBmp.rowBytes()));
          if (!proxy) {
              return;
          }
  
          SkTArray<SkMatrix> textureMatrices;
          textureMatrices.push_back() = SkMatrix::I();
          textureMatrices.push_back() = SkMatrix::MakeScale(1.5f, 0.85f);
          textureMatrices.push_back();
          textureMatrices.back().setRotate(45.f, proxy->width() / 2.f, proxy->height() / 2.f);
  
          const SkIRect texelDomains[] = {
              fBmp.bounds(),
              SkIRect::MakeXYWH(fBmp.width() / 4, fBmp.height() / 4,
                                fBmp.width() / 2, fBmp.height() / 2),
          };
  
          SkRect renderRect = SkRect::Make(fBmp.bounds());
          renderRect.outset(kDrawPad, kDrawPad);
  
          SkScalar y = kDrawPad + kTestPad;
          for (int tm = 0; tm < textureMatrices.count(); ++tm) {
              for (size_t d = 0; d < SK_ARRAY_COUNT(texelDomains); ++d) {
                  SkScalar x = kDrawPad + kTestPad;
                  for (int m = 0; m < GrTextureDomain::kModeCount; ++m) {
                      GrTextureDomain::Mode mode = (GrTextureDomain::Mode) m;
                      GrPaint grPaint;
                      grPaint.setXPFactory(GrPorterDuffXPFactory::Get(SkBlendMode::kSrc));
                      sk_sp<GrFragmentProcessor> fp(
                          GrTextureDomainEffect::Make(
                                     context->resourceProvider(), proxy,
                                     nullptr, textureMatrices[tm],
                                     GrTextureDomain::MakeTexelDomainForMode(texelDomains[d], mode),
                                     mode, GrSamplerParams::kNone_FilterMode));
  
                      if (!fp) {
                          continue;
                      }
                      const SkMatrix viewMatrix = SkMatrix::MakeTrans(x, y);
                      grPaint.addColorFragmentProcessor(std::move(fp));
                      renderTargetContext->priv().testingOnly_addDrawOp(
                              GrNonAAFillRectOp::Make(std::move(grPaint), viewMatrix, renderRect,
                                                      nullptr, nullptr, GrAAType::kNone));
                      x += renderRect.width() + kTestPad;
                  }
                  y += renderRect.height() + kTestPad;
              }
          }
      }
  
  private:
      static constexpr SkScalar kDrawPad = 10.f;
      static constexpr SkScalar kTestPad = 10.f;;
      static constexpr int      kTargetWidth = 100;
      static constexpr int      kTargetHeight = 100;
      SkBitmap fBmp;
  
      typedef GM INHERITED;
  };
  
  DEF_GM(return new TextureDomainEffect;)
  }
  
  #endif
  