| /* |
| * Copyright 2014 Google Inc. |
| * |
| * Use of this source code is governed by a BSD-style license that can be |
| * found in the LICENSE file. |
| */ |
| |
| #include "SkGradientShader.h" |
| #include "SkSurface.h" |
| #include "SkSurfaceProps.h" |
| #include "SkTextUtils.h" |
| #include "ToolUtils.h" |
| #include "gm.h" |
| |
| #define W 200 |
| #define H 100 |
| |
| static sk_sp<SkShader> make_shader() { |
| int a = 0x99; |
| int b = 0xBB; |
| SkPoint pts[] = { { 0, 0 }, { W, H } }; |
| SkColor colors[] = { SkColorSetRGB(a, a, a), SkColorSetRGB(b, b, b) }; |
| return SkGradientShader::MakeLinear(pts, colors, nullptr, 2, SkShader::kClamp_TileMode); |
| } |
| |
| static sk_sp<SkSurface> make_surface(GrContext* ctx, const SkImageInfo& info, SkPixelGeometry geo) { |
| SkSurfaceProps props(0, geo); |
| if (ctx) { |
| return SkSurface::MakeRenderTarget(ctx, SkBudgeted::kNo, info, 0, &props); |
| } else { |
| return SkSurface::MakeRaster(info, &props); |
| } |
| } |
| |
| static void test_draw(SkCanvas* canvas, const char label[]) { |
| SkPaint paint; |
| |
| paint.setAntiAlias(true); |
| paint.setDither(true); |
| |
| paint.setShader(make_shader()); |
| canvas->drawRect(SkRect::MakeWH(W, H), paint); |
| paint.setShader(nullptr); |
| |
| paint.setColor(SK_ColorWHITE); |
| SkFont font(ToolUtils::create_portable_typeface(), 32); |
| font.setEdging(SkFont::Edging::kSubpixelAntiAlias); |
| SkTextUtils::DrawString(canvas, label, W / 2, H * 3 / 4, font, paint, |
| SkTextUtils::kCenter_Align); |
| } |
| |
| class SurfacePropsGM : public skiagm::GM { |
| public: |
| SurfacePropsGM() {} |
| |
| protected: |
| SkString onShortName() override { |
| return SkString("surfaceprops"); |
| } |
| |
| SkISize onISize() override { |
| return SkISize::Make(W, H * 5); |
| } |
| |
| void onDraw(SkCanvas* canvas) override { |
| GrContext* ctx = canvas->getGrContext(); |
| |
| // must be opaque to have a hope of testing LCD text |
| const SkImageInfo info = SkImageInfo::MakeN32(W, H, kOpaque_SkAlphaType); |
| |
| const struct { |
| SkPixelGeometry fGeo; |
| const char* fLabel; |
| } recs[] = { |
| { kUnknown_SkPixelGeometry, "Unknown" }, |
| { kRGB_H_SkPixelGeometry, "RGB_H" }, |
| { kBGR_H_SkPixelGeometry, "BGR_H" }, |
| { kRGB_V_SkPixelGeometry, "RGB_V" }, |
| { kBGR_V_SkPixelGeometry, "BGR_V" }, |
| }; |
| |
| SkScalar x = 0; |
| SkScalar y = 0; |
| for (const auto& rec : recs) { |
| auto surface(make_surface(ctx, info, rec.fGeo)); |
| if (!surface) { |
| SkDebugf("failed to create surface! label: %s", rec.fLabel); |
| continue; |
| } |
| test_draw(surface->getCanvas(), rec.fLabel); |
| surface->draw(canvas, x, y, nullptr); |
| y += H; |
| } |
| } |
| |
| private: |
| typedef GM INHERITED; |
| }; |
| DEF_GM( return new SurfacePropsGM ) |
| |
| #ifdef SK_DEBUG |
| static bool equal(const SkSurfaceProps& a, const SkSurfaceProps& b) { |
| return a.flags() == b.flags() && a.pixelGeometry() == b.pixelGeometry(); |
| } |
| #endif |
| |
| class NewSurfaceGM : public skiagm::GM { |
| public: |
| NewSurfaceGM() {} |
| |
| protected: |
| SkString onShortName() override { |
| return SkString("surfacenew"); |
| } |
| |
| SkISize onISize() override { |
| return SkISize::Make(300, 140); |
| } |
| |
| static void drawInto(SkCanvas* canvas) { |
| canvas->drawColor(SK_ColorRED); |
| } |
| |
| void onDraw(SkCanvas* canvas) override { |
| SkImageInfo info = SkImageInfo::MakeN32Premul(100, 100); |
| |
| auto surf(ToolUtils::makeSurface(canvas, info, nullptr)); |
| drawInto(surf->getCanvas()); |
| |
| sk_sp<SkImage> image(surf->makeImageSnapshot()); |
| canvas->drawImage(image, 10, 10, nullptr); |
| |
| auto surf2(surf->makeSurface(info)); |
| drawInto(surf2->getCanvas()); |
| |
| // Assert that the props were communicated transitively through the first image |
| SkASSERT(equal(surf->props(), surf2->props())); |
| |
| sk_sp<SkImage> image2(surf2->makeImageSnapshot()); |
| canvas->drawImage(image2.get(), 10 + SkIntToScalar(image->width()) + 10, 10, nullptr); |
| } |
| |
| private: |
| typedef GM INHERITED; |
| }; |
| DEF_GM( return new NewSurfaceGM ) |
| |
| /////////////////////////////////////////////////////////////////////////////////////////////////// |
| |
| DEF_SIMPLE_GM(copy_on_write_retain, canvas, 256, 256) { |
| const SkImageInfo info = SkImageInfo::MakeN32Premul(256, 256); |
| sk_sp<SkSurface> surf = ToolUtils::makeSurface(canvas, info); |
| |
| surf->getCanvas()->clear(SK_ColorRED); |
| // its important that image survives longer than the next draw, so the surface will see |
| // an outstanding image, and have to decide if it should retain or discard those pixels |
| sk_sp<SkImage> image = surf->makeImageSnapshot(); |
| |
| // normally a clear+opaque should trigger the discard optimization, but since we have a clip |
| // it should not (we need the previous red pixels). |
| surf->getCanvas()->clipRect(SkRect::MakeWH(128, 256)); |
| surf->getCanvas()->clear(SK_ColorBLUE); |
| |
| // expect to see two rects: blue | red |
| canvas->drawImage(surf->makeImageSnapshot(), 0, 0, nullptr); |
| } |
| |
| DEF_SIMPLE_GM(copy_on_write_savelayer, canvas, 256, 256) { |
| const SkImageInfo info = SkImageInfo::MakeN32Premul(256, 256); |
| sk_sp<SkSurface> surf = ToolUtils::makeSurface(canvas, info); |
| surf->getCanvas()->clear(SK_ColorRED); |
| // its important that image survives longer than the next draw, so the surface will see |
| // an outstanding image, and have to decide if it should retain or discard those pixels |
| sk_sp<SkImage> image = surf->makeImageSnapshot(); |
| |
| // now draw into a full-screen layer. This should (a) trigger a copy-on-write, but it should |
| // not trigger discard, even tho its alpha (SK_ColorBLUE) is opaque, since it is in a layer |
| // with a non-opaque paint. |
| SkPaint paint; |
| paint.setAlphaf(0.25f); |
| surf->getCanvas()->saveLayer({0, 0, 256, 256}, &paint); |
| surf->getCanvas()->clear(SK_ColorBLUE); |
| surf->getCanvas()->restore(); |
| |
| // expect to see two rects: blue blended on red |
| canvas->drawImage(surf->makeImageSnapshot(), 0, 0, nullptr); |
| } |
| |
| DEF_SIMPLE_GM(surface_underdraw, canvas, 256, 256) { |
| SkImageInfo info = SkImageInfo::MakeN32Premul(256, 256, nullptr); |
| auto surf = ToolUtils::makeSurface(canvas, info); |
| |
| const SkIRect subset = SkIRect::MakeLTRB(180, 0, 256, 256); |
| |
| // noisy background |
| { |
| SkPoint pts[] = {{0, 0}, {40, 50}}; |
| SkColor colors[] = {SK_ColorRED, SK_ColorBLUE}; |
| auto sh = SkGradientShader::MakeLinear(pts, colors, nullptr, 2, SkShader::kRepeat_TileMode); |
| SkPaint paint; |
| paint.setShader(sh); |
| surf->getCanvas()->drawPaint(paint); |
| } |
| |
| // save away the right-hand strip, then clear it |
| sk_sp<SkImage> saveImg = surf->makeImageSnapshot(subset); |
| { |
| SkPaint paint; |
| paint.setBlendMode(SkBlendMode::kClear); |
| surf->getCanvas()->drawRect(SkRect::Make(subset), paint); |
| } |
| |
| // draw the "foreground" |
| { |
| SkPaint paint; |
| paint.setColor(SK_ColorGREEN); |
| SkRect r = { 0, 10, 256, 35 }; |
| while (r.fBottom < 256) { |
| surf->getCanvas()->drawRect(r, paint); |
| r.offset(0, r.height() * 2); |
| } |
| } |
| |
| // apply the "fade" |
| { |
| SkPoint pts[] = {{SkIntToScalar(subset.left()), 0}, {SkIntToScalar(subset.right()), 0}}; |
| SkColor colors[] = {0xFF000000, 0}; |
| auto sh = SkGradientShader::MakeLinear(pts, colors, nullptr, 2, SkShader::kClamp_TileMode); |
| SkPaint paint; |
| paint.setShader(sh); |
| paint.setBlendMode(SkBlendMode::kDstIn); |
| surf->getCanvas()->drawRect(SkRect::Make(subset), paint); |
| } |
| |
| // restore the original strip, drawing it "under" the current foreground |
| { |
| SkPaint paint; |
| paint.setBlendMode(SkBlendMode::kDstOver); |
| surf->getCanvas()->drawImage(saveImg, |
| SkIntToScalar(subset.left()), SkIntToScalar(subset.top()), |
| &paint); |
| } |
| |
| // show it on screen |
| surf->draw(canvas, 0, 0, nullptr); |
| } |