| /* |
| * Copyright 2015 Google Inc. |
| * |
| * Use of this source code is governed by a BSD-style license that can be |
| * found in the LICENSE file. |
| */ |
| |
| #include "gm/gm.h" |
| #include "include/core/SkCanvas.h" |
| #include "include/core/SkColor.h" |
| #include "include/core/SkColorSpace.h" |
| #include "include/core/SkImage.h" |
| #include "include/core/SkPaint.h" |
| #include "include/core/SkRect.h" |
| #include "include/core/SkScalar.h" |
| #include "include/core/SkSize.h" |
| #include "include/core/SkString.h" |
| #include "include/core/SkSurface.h" |
| |
| namespace skiagm { |
| |
| // This GM exercises anisotropic image scaling. |
| class AnisotropicGM : public GM { |
| public: |
| enum class Mode { kLinear, kMip, kAniso }; |
| |
| AnisotropicGM(Mode mode) : fMode(mode) { |
| switch (fMode) { |
| case Mode::kLinear: |
| fSampling = SkSamplingOptions(SkFilterMode::kLinear); |
| break; |
| case Mode::kMip: |
| fSampling = SkSamplingOptions(SkFilterMode::kLinear, SkMipmapMode::kLinear); |
| break; |
| case Mode::kAniso: |
| fSampling = SkSamplingOptions::Aniso(16); |
| break; |
| } |
| this->setBGColor(0xFFCCCCCC); |
| } |
| |
| protected: |
| SkString onShortName() override { |
| SkString name("anisotropic_image_scale_"); |
| switch (fMode) { |
| case Mode::kLinear: |
| name += "linear"; |
| break; |
| case Mode::kMip: |
| name += "mip"; |
| break; |
| case Mode::kAniso: |
| name += "aniso"; |
| break; |
| } |
| return name; |
| } |
| |
| SkISize onISize() override { |
| return SkISize::Make(2*kImageSize + 3*kSpacer, |
| kNumVertImages*kImageSize + (kNumVertImages+1)*kSpacer); |
| } |
| |
| // Create an image consisting of lines radiating from its center |
| void onOnceBeforeDraw() override { |
| constexpr int kNumLines = 100; |
| constexpr SkScalar kAngleStep = 360.0f / kNumLines; |
| constexpr int kInnerOffset = 10; |
| |
| auto info = SkImageInfo::MakeN32(kImageSize, kImageSize, kOpaque_SkAlphaType); |
| auto surf = SkSurface::MakeRaster(info); |
| auto canvas = surf->getCanvas(); |
| |
| canvas->clear(SK_ColorWHITE); |
| |
| SkPaint p; |
| p.setAntiAlias(true); |
| |
| SkScalar angle = 0.0f, sin, cos; |
| |
| canvas->translate(kImageSize/2.0f, kImageSize/2.0f); |
| for (int i = 0; i < kNumLines; ++i, angle += kAngleStep) { |
| sin = SkScalarSin(angle); |
| cos = SkScalarCos(angle); |
| canvas->drawLine(cos * kInnerOffset, sin * kInnerOffset, |
| cos * kImageSize/2, sin * kImageSize/2, p); |
| } |
| fImage = surf->makeImageSnapshot(); |
| } |
| |
| void draw(SkCanvas* canvas, int x, int y, int xSize, int ySize) { |
| SkRect r = SkRect::MakeXYWH(SkIntToScalar(x), SkIntToScalar(y), |
| SkIntToScalar(xSize), SkIntToScalar(ySize)); |
| canvas->drawImageRect(fImage, r, fSampling); |
| } |
| |
| void onDraw(SkCanvas* canvas) override { |
| SkScalar gScales[] = { 0.9f, 0.8f, 0.75f, 0.6f, 0.5f, 0.4f, 0.25f, 0.2f, 0.1f }; |
| |
| SkASSERT(kNumVertImages-1 == (int)std::size(gScales)/2); |
| |
| // Minimize vertically |
| for (int i = 0; i < (int)std::size(gScales); ++i) { |
| int height = SkScalarFloorToInt(fImage->height() * gScales[i]); |
| |
| int yOff; |
| if (i <= (int)std::size(gScales)/2) { |
| yOff = kSpacer + i * (fImage->height() + kSpacer); |
| } else { |
| // Position the more highly squashed images with their less squashed counterparts |
| yOff = (std::size(gScales) - i) * (fImage->height() + kSpacer) - height; |
| } |
| |
| this->draw(canvas, kSpacer, yOff, fImage->width(), height); |
| } |
| |
| // Minimize horizontally |
| for (int i = 0; i < (int)std::size(gScales); ++i) { |
| int width = SkScalarFloorToInt(fImage->width() * gScales[i]); |
| |
| int xOff, yOff; |
| if (i <= (int)std::size(gScales)/2) { |
| xOff = fImage->width() + 2*kSpacer; |
| yOff = kSpacer + i * (fImage->height() + kSpacer); |
| } else { |
| // Position the more highly squashed images with their less squashed counterparts |
| xOff = fImage->width() + 2*kSpacer + fImage->width() - width; |
| yOff = kSpacer + (std::size(gScales) - i - 1) * (fImage->height() + kSpacer); |
| } |
| |
| this->draw(canvas, xOff, yOff, width, fImage->height()); |
| } |
| } |
| |
| private: |
| inline static constexpr int kImageSize = 256; |
| inline static constexpr int kSpacer = 10; |
| inline static constexpr int kNumVertImages = 5; |
| |
| sk_sp<SkImage> fImage; |
| SkSamplingOptions fSampling; |
| Mode fMode; |
| |
| using INHERITED = GM; |
| }; |
| |
| ////////////////////////////////////////////////////////////////////////////// |
| |
| DEF_GM(return new AnisotropicGM(AnisotropicGM::Mode::kLinear);) |
| DEF_GM(return new AnisotropicGM(AnisotropicGM::Mode::kMip);) |
| DEF_GM(return new AnisotropicGM(AnisotropicGM::Mode::kAniso);) |
| |
| ////////////////////////////////////////////////////////////////////////////// |
| |
| class AnisoMipsGM : public GM { |
| public: |
| AnisoMipsGM() = default; |
| |
| protected: |
| SkString onShortName() override { return SkString("anisomips"); } |
| |
| SkISize onISize() override { return SkISize::Make(520, 260); } |
| |
| sk_sp<SkImage> updateImage(SkSurface* surf, SkColor color) { |
| surf->getCanvas()->clear(color); |
| SkPaint paint; |
| paint.setColor(~color | 0xFF000000); |
| surf->getCanvas()->drawRect(SkRect::MakeLTRB(surf->width() *2/5.f, |
| surf->height()*2/5.f, |
| surf->width() *3/5.f, |
| surf->height()*3/5.f), |
| paint); |
| return surf->makeImageSnapshot()->withDefaultMipmaps(); |
| } |
| |
| void onDraw(SkCanvas* canvas) override { |
| auto ct = canvas->imageInfo().colorType() == kUnknown_SkColorType |
| ? kRGBA_8888_SkColorType |
| : canvas->imageInfo().colorType(); |
| auto ii = SkImageInfo::Make(kImageSize, |
| kImageSize, |
| ct, |
| kPremul_SkAlphaType, |
| canvas->imageInfo().refColorSpace()); |
| // In GPU mode we want a surface that is created with mipmaps to ensure that we exercise the |
| // case where the SkSurface and SkImage share a texture. If the surface texture isn't |
| // created with MIPs then asking for a mipmapped image will cause a copy to a mipped |
| // texture. |
| sk_sp<SkSurface> surface; |
| if (auto rc = canvas->recordingContext()) { |
| surface = SkSurface::MakeRenderTarget(rc, |
| SkBudgeted::kYes, |
| ii, |
| 1, |
| kTopLeft_GrSurfaceOrigin, |
| /*surfaceProps=*/nullptr, |
| /*shouldCreateWithMips=*/true); |
| if (!surface) { |
| // We could be in an abandoned context situation. |
| return; |
| } |
| } else { |
| surface = canvas->makeSurface(ii); |
| if (!surface) { // could be a recording canvas. |
| surface = SkSurface::MakeRaster(ii); |
| } |
| } |
| |
| static constexpr float kScales[] = {1.f, 0.5f, 0.25f, 0.125f}; |
| SkColor kColors[] = {0xFFF0F0F0, SK_ColorBLUE, SK_ColorGREEN, SK_ColorRED}; |
| static const SkSamplingOptions kSampling = SkSamplingOptions::Aniso(16); |
| |
| for (bool shader : {false, true}) { |
| int c = 0; |
| canvas->save(); |
| for (float sy : kScales) { |
| canvas->save(); |
| for (float sx : kScales) { |
| canvas->save(); |
| canvas->scale(sx, sy); |
| auto image = this->updateImage(surface.get(), kColors[c]); |
| if (shader) { |
| SkPaint paint; |
| paint.setShader(image->makeShader(kSampling)); |
| canvas->drawRect(SkRect::Make(image->dimensions()), paint); |
| } else { |
| canvas->drawImage(image, 0, 0, kSampling); |
| } |
| canvas->restore(); |
| canvas->translate(ii.width() * sx + kPad, 0); |
| c = (c + 1) % std::size(kColors); |
| } |
| canvas->restore(); |
| canvas->translate(0, ii.width() * sy + kPad); |
| } |
| canvas->restore(); |
| for (float sx : kScales) { |
| canvas->translate(ii.width() * sx + kPad, 0); |
| } |
| } |
| } |
| |
| private: |
| inline static constexpr int kImageSize = 128; |
| inline static constexpr int kPad = 5; |
| |
| using INHERITED = GM; |
| }; |
| |
| ////////////////////////////////////////////////////////////////////////////// |
| |
| DEF_GM(return new AnisoMipsGM();) |
| |
| } // namespace skiagm |