| /* |
| * Copyright 2012 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/SkBitmap.h" |
| #include "include/core/SkBlendMode.h" |
| #include "include/core/SkCanvas.h" |
| #include "include/core/SkColor.h" |
| #include "include/core/SkColorPriv.h" |
| #include "include/core/SkImage.h" |
| #include "include/core/SkImageInfo.h" |
| #include "include/core/SkMatrix.h" |
| #include "include/core/SkPaint.h" |
| #include "include/core/SkPoint.h" |
| #include "include/core/SkRect.h" |
| #include "include/core/SkRefCnt.h" |
| #include "include/core/SkScalar.h" |
| #include "include/core/SkShader.h" |
| #include "include/core/SkSize.h" |
| #include "include/core/SkString.h" |
| #include "include/core/SkTileMode.h" |
| #include "include/core/SkTypes.h" |
| #include "include/effects/SkGradientShader.h" |
| #include "include/private/base/SkTDArray.h" |
| #include "src/base/SkTLazy.h" |
| #include "tools/ToolUtils.h" |
| |
| #include <utility> |
| |
| static sk_sp<SkShader> make_shader(SkBlendMode mode) { |
| SkPoint pts[2]; |
| SkColor colors[2]; |
| |
| pts[0].set(0, 0); |
| pts[1].set(SkIntToScalar(100), 0); |
| colors[0] = SK_ColorRED; |
| colors[1] = SK_ColorBLUE; |
| auto shaderA = SkGradientShader::MakeLinear(pts, colors, nullptr, 2, SkTileMode::kClamp); |
| |
| pts[0].set(0, 0); |
| pts[1].set(0, SkIntToScalar(100)); |
| colors[0] = SK_ColorBLACK; |
| colors[1] = SkColorSetARGB(0x80, 0, 0, 0); |
| auto shaderB = SkGradientShader::MakeLinear(pts, colors, nullptr, 2, SkTileMode::kClamp); |
| |
| return SkShaders::Blend(mode, std::move(shaderA), std::move(shaderB)); |
| } |
| |
| class ComposeShaderGM : public skiagm::GM { |
| protected: |
| void onOnceBeforeDraw() override { |
| fShader = make_shader(SkBlendMode::kDstIn); |
| } |
| |
| SkString onShortName() override { |
| return SkString("composeshader"); |
| } |
| |
| SkISize onISize() override { |
| return SkISize::Make(120, 120); |
| } |
| |
| void onDraw(SkCanvas* canvas) override { |
| SkPaint paint; |
| paint.setColor(SK_ColorGREEN); |
| canvas->drawRect(SkRect::MakeWH(100, 100), paint); |
| paint.setShader(fShader); |
| canvas->drawRect(SkRect::MakeWH(100, 100), paint); |
| } |
| |
| protected: |
| sk_sp<SkShader> fShader; |
| |
| private: |
| typedef GM INHERITED ; |
| }; |
| DEF_GM( return new ComposeShaderGM; ) |
| |
| class ComposeShaderAlphaGM : public skiagm::GM { |
| public: |
| ComposeShaderAlphaGM() {} |
| |
| protected: |
| SkString onShortName() override { |
| return SkString("composeshader_alpha"); |
| } |
| |
| SkISize onISize() override { |
| return SkISize::Make(750, 220); |
| } |
| |
| void onDraw(SkCanvas* canvas) override { |
| sk_sp<SkShader> shaders[] = { |
| make_shader(SkBlendMode::kDstIn), |
| make_shader(SkBlendMode::kSrcOver), |
| }; |
| |
| SkPaint paint; |
| paint.setColor(SK_ColorGREEN); |
| |
| const SkRect r = SkRect::MakeXYWH(5, 5, 100, 100); |
| |
| for (size_t y = 0; y < std::size(shaders); ++y) { |
| canvas->save(); |
| for (int alpha = 0xFF; alpha > 0; alpha -= 0x28) { |
| paint.setAlphaf(1.0f); |
| paint.setShader(nullptr); |
| canvas->drawRect(r, paint); |
| |
| paint.setAlpha(alpha); |
| paint.setShader(shaders[y]); |
| canvas->drawRect(r, paint); |
| |
| canvas->translate(r.width() + 5, 0); |
| } |
| canvas->restore(); |
| canvas->translate(0, r.height() + 5); |
| } |
| } |
| |
| private: |
| typedef GM INHERITED ; |
| }; |
| DEF_GM( return new ComposeShaderAlphaGM; ) |
| |
| // creates a square bitmap with red background and a green circle in the center |
| static void draw_color_bm(SkBitmap* bm, int length) { |
| SkPaint paint; |
| paint.setColor(SK_ColorGREEN); |
| |
| bm->allocN32Pixels(length, length); |
| bm->eraseColor(SK_ColorRED); |
| |
| SkCanvas canvas(*bm); |
| canvas.drawCircle(SkIntToScalar(length/2), SkIntToScalar(length/2), SkIntToScalar(length/2), |
| paint); |
| } |
| |
| // creates a square alpha8 bitmap with transparent background and an opaque circle in the center |
| static void draw_alpha8_bm(SkBitmap* bm, int length) { |
| SkPaint circlePaint; |
| circlePaint.setColor(SK_ColorBLACK); |
| |
| bm->allocPixels(SkImageInfo::MakeA8(length, length)); |
| bm->eraseColor(SK_ColorTRANSPARENT); |
| |
| SkCanvas canvas(*bm); |
| canvas.drawCircle(SkIntToScalar(length/2), SkIntToScalar(length/2), SkIntToScalar(length/4), |
| circlePaint); |
| } |
| |
| // creates a linear gradient shader |
| static sk_sp<SkShader> make_linear_gradient_shader(int length) { |
| SkPoint pts[2]; |
| SkColor colors[2]; |
| pts[0].set(0, 0); |
| pts[1].set(SkIntToScalar(length), 0); |
| colors[0] = SK_ColorBLUE; |
| colors[1] = SkColorSetARGB(0, 0, 0, 0xFF); |
| return SkGradientShader::MakeLinear(pts, colors, nullptr, 2, SkTileMode::kClamp); |
| } |
| |
| |
| class ComposeShaderBitmapGM : public skiagm::GM { |
| public: |
| ComposeShaderBitmapGM(bool use_lm) : fUseLocalMatrix(use_lm) {} |
| |
| protected: |
| SkString onShortName() override { |
| return SkStringPrintf("composeshader_bitmap%s", fUseLocalMatrix ? "_lm" : ""); |
| } |
| |
| SkISize onISize() override { |
| return SkISize::Make(7 * (squareLength + 5), 2 * (squareLength + 5)); |
| } |
| |
| void onDraw(SkCanvas* canvas) override { |
| if (!fInitialized) { |
| draw_color_bm(&fColorBitmap, squareLength); |
| sk_sp<SkImage> img = SkImages::RasterFromBitmap(fColorBitmap); |
| img = ToolUtils::MakeTextureImage(canvas, std::move(img)); |
| if (img) { |
| fColorBitmapShader = img->makeShader(SkTileMode::kRepeat, SkTileMode::kRepeat, |
| SkSamplingOptions(), SkMatrix::I()); |
| } |
| draw_alpha8_bm(&fAlpha8Bitmap, squareLength); |
| img = SkImages::RasterFromBitmap(fAlpha8Bitmap); |
| img = ToolUtils::MakeTextureImage(canvas, std::move(img)); |
| if (img) { |
| fAlpha8BitmapShader = fAlpha8Bitmap.makeShader(SkTileMode::kRepeat, |
| SkTileMode::kRepeat, |
| SkSamplingOptions(), |
| SkMatrix::I()); |
| } |
| fLinearGradientShader = make_linear_gradient_shader(squareLength); |
| fInitialized = true; |
| } |
| |
| SkBlendMode mode = SkBlendMode::kDstOver; |
| |
| SkMatrix lm = SkMatrix::Translate(0, squareLength * 0.5f); |
| |
| sk_sp<SkShader> shaders[] = { |
| // gradient should appear over color bitmap |
| SkShaders::Blend(mode, fLinearGradientShader, fColorBitmapShader), |
| // gradient should appear over alpha8 bitmap colorized by the paint color |
| SkShaders::Blend(mode, fLinearGradientShader, fAlpha8BitmapShader), |
| }; |
| if (fUseLocalMatrix) { |
| for (unsigned i = 0; i < std::size(shaders); ++i) { |
| shaders[i] = shaders[i] ? shaders[i]->makeWithLocalMatrix(lm) : nullptr; |
| } |
| } |
| |
| SkPaint paint; |
| paint.setColor(SK_ColorYELLOW); |
| |
| const SkRect r = SkRect::MakeIWH(squareLength, squareLength); |
| |
| for (size_t y = 0; y < std::size(shaders); ++y) { |
| canvas->save(); |
| for (int alpha = 0xFF; alpha > 0; alpha -= 0x28) { |
| paint.setAlpha(alpha); |
| paint.setShader(shaders[y]); |
| canvas->drawRect(r, paint); |
| |
| canvas->translate(r.width() + 5, 0); |
| } |
| canvas->restore(); |
| canvas->translate(0, r.height() + 5); |
| } |
| } |
| |
| private: |
| /** This determines the length and width of the bitmaps used in the ComposeShaders. Values |
| * above 20 may cause an SkASSERT to fail in SkSmallAllocator. However, larger values will |
| * work in a release build. You can change this parameter and then compile a release build |
| * to have this GM draw larger bitmaps for easier visual inspection. |
| */ |
| inline static constexpr int squareLength = 20; |
| |
| const bool fUseLocalMatrix; |
| |
| bool fInitialized = false; |
| SkBitmap fColorBitmap; |
| SkBitmap fAlpha8Bitmap; |
| sk_sp<SkShader> fColorBitmapShader; |
| sk_sp<SkShader> fAlpha8BitmapShader; |
| sk_sp<SkShader> fLinearGradientShader; |
| |
| using INHERITED = GM; |
| }; |
| DEF_GM( return new ComposeShaderBitmapGM(false); ) |
| DEF_GM( return new ComposeShaderBitmapGM(true); ) |
| |
| DEF_SIMPLE_GM(composeshader_bitmap2, canvas, 200, 200) { |
| int width = 255; |
| int height = 255; |
| SkTDArray<uint8_t> dst8Storage; |
| dst8Storage.resize(width * height); |
| SkTDArray<uint32_t> dst32Storage; |
| dst32Storage.resize(width * height * sizeof(int32_t)); |
| for (int y = 0; y < height; ++y) { |
| for (int x = 0; x < width; ++x) { |
| dst8Storage[y * width + x] = (y + x) / 2; |
| dst32Storage[y * width + x] = SkPackARGB32(0xFF, x, y, 0); |
| } |
| } |
| SkPaint paint; |
| paint.setAntiAlias(true); |
| paint.setColor(SK_ColorBLUE); |
| SkRect r = {0, 0, SkIntToScalar(width), SkIntToScalar(height)}; |
| canvas->drawRect(r, paint); |
| SkBitmap skBitmap, skMask; |
| SkImageInfo imageInfo = SkImageInfo::Make(width, height, |
| SkColorType::kN32_SkColorType, kPremul_SkAlphaType); |
| skBitmap.installPixels(imageInfo, dst32Storage.begin(), width * sizeof(int32_t), |
| nullptr, nullptr); |
| imageInfo = SkImageInfo::Make(width, height, |
| SkColorType::kAlpha_8_SkColorType, kPremul_SkAlphaType); |
| skMask.installPixels(imageInfo, dst8Storage.begin(), width, nullptr, nullptr); |
| sk_sp<SkImage> skSrc = skBitmap.asImage(); |
| sk_sp<SkImage> skMaskImage = skMask.asImage(); |
| paint.setShader( |
| SkShaders::Blend(SkBlendMode::kSrcIn, |
| skMaskImage->makeShader(SkSamplingOptions()), |
| skSrc->makeShader(SkSamplingOptions()))); |
| canvas->drawRect(r, paint); |
| } |
| |
| /////////////////////////////////////////////////////////////////////////////////////////////////// |
| |
| static sk_sp<SkShader> make_src_shader(SkScalar size) { |
| const SkPoint pts[] = { { 0, 0 }, { 0, size } }; |
| const SkColor colors[] = { 0xFF0000FF, 0x000000FF }; |
| return SkGradientShader::MakeLinear(pts, colors, nullptr, 2, SkTileMode::kClamp); |
| } |
| |
| static sk_sp<SkShader> make_dst_shader(SkScalar size) { |
| const SkPoint pts[] = { { 0, 0 }, { size, 0 } }; |
| const SkColor colors[] = { SK_ColorRED, 0x00FF0000 }; |
| return SkGradientShader::MakeLinear(pts, colors, nullptr, 2, SkTileMode::kClamp); |
| } |
| |
| const SkScalar gCellSize = 100; |
| |
| static void draw_cell(SkCanvas* canvas, sk_sp<SkShader> src, sk_sp<SkShader> dst, |
| SkBlendMode mode, SkAlpha alpha) { |
| const SkRect r = SkRect::MakeWH(gCellSize, gCellSize); |
| SkPaint p; |
| p.setAlpha(alpha); |
| |
| SkAutoCanvasRestore acr(canvas, false); |
| canvas->saveLayer(&r, &p); |
| p.setAlpha(0xFF); |
| |
| p.setShader(dst); |
| p.setBlendMode(SkBlendMode::kSrc); |
| canvas->drawRect(r, p); |
| |
| p.setShader(src); |
| p.setBlendMode(mode); |
| canvas->drawRect(r, p); |
| } |
| |
| static void draw_composed(SkCanvas* canvas, sk_sp<SkShader> src, sk_sp<SkShader> dst, |
| SkBlendMode mode, SkAlpha alpha) { |
| SkPaint p; |
| p.setAlpha(alpha); |
| p.setShader(SkShaders::Blend(mode, dst, src)); |
| canvas->drawRect(SkRect::MakeWH(gCellSize, gCellSize), p); |
| } |
| |
| static void draw_pair(SkCanvas* canvas, sk_sp<SkShader> src, sk_sp<SkShader> dst, |
| SkBlendMode mode) { |
| SkAutoCanvasRestore acr(canvas, true); |
| |
| const SkScalar gap = 4; |
| SkRect r = SkRect::MakeWH(2 * gCellSize + gap, 2 * gCellSize + gap); |
| r.outset(gap + 1.5f, gap + 1.5f); |
| SkPaint p; |
| p.setStyle(SkPaint::kStroke_Style); |
| canvas->drawRect(r, p); // border |
| |
| SkAlpha alpha = 0xFF; |
| for (int y = 0; y < 2; ++y) { |
| draw_cell(canvas, src, dst, mode, alpha); |
| canvas->save(); |
| canvas->translate(gCellSize + gap, 0); |
| draw_composed(canvas, src, dst, mode, alpha); |
| canvas->restore(); |
| |
| canvas->translate(0, gCellSize + gap); |
| alpha = 0x80; |
| } |
| } |
| |
| DEF_SIMPLE_GM(composeshader_grid, canvas, 882, 882) { |
| auto src = make_src_shader(gCellSize); |
| auto dst = make_dst_shader(gCellSize); |
| |
| const SkScalar margin = 15; |
| const SkScalar dx = 2*gCellSize + margin; |
| const SkScalar dy = 2*gCellSize + margin; |
| |
| canvas->translate(margin, margin); |
| canvas->save(); |
| for (int m = 0; m < 16; ++m) { |
| SkBlendMode mode = static_cast<SkBlendMode>(m); |
| draw_pair(canvas, src, dst, mode); |
| if ((m % 4) == 3) { |
| canvas->restore(); |
| canvas->translate(0, dy); |
| canvas->save(); |
| } else { |
| canvas->translate(dx, 0); |
| } |
| } |
| canvas->restore(); |
| } |