/* * Copyright 2017 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/SkCanvas.h" #include "include/core/SkColor.h" #include "include/core/SkImage.h" #include "include/core/SkImageFilter.h" #include "include/core/SkImageInfo.h" #include "include/core/SkPaint.h" #include "include/core/SkRect.h" #include "include/core/SkRefCnt.h" #include "include/core/SkScalar.h" #include "include/core/SkSize.h" #include "include/core/SkString.h" #include "include/core/SkSurface.h" #include "include/effects/SkImageFilters.h" #include "tools/ToolUtils.h" #include #include static sk_sp make_image(SkCanvas* canvas, int direction) { SkImageInfo info = SkImageInfo::MakeN32Premul(250, 200); auto surface = ToolUtils::makeSurface(canvas, info); SkCanvas* c = surface->getCanvas(); SkPaint paint; paint.setAntiAlias(true); const SkColor colors[] = { SK_ColorRED, SK_ColorBLUE, SK_ColorGREEN, SK_ColorYELLOW, SK_ColorBLACK }; int width = 25; bool xDirection = (direction & 0x1) == 1; bool yDirection = (direction & 0x2) == 2; if (xDirection) { for (int x = 0; x < info.width(); x += width) { paint.setColor(colors[x/width % 5]); if (yDirection) { paint.setAlphaf(0.5f); } c->drawRect(SkRect::MakeXYWH(x, 0, width, info.height()), paint); } } if (yDirection) { for (int y = 0; y < info.height(); y += width) { paint.setColor(colors[y/width % 5]); if (xDirection) { paint.setAlphaf(0.5f); } c->drawRect(SkRect::MakeXYWH(0, y, info.width(), width), paint); } } return surface->makeImageSnapshot(); } static void draw_image(SkCanvas* canvas, const sk_sp image, sk_sp filter) { SkAutoCanvasRestore acr(canvas, true); SkPaint paint; paint.setImageFilter(std::move(filter)); canvas->translate(SkIntToScalar(30), 0); canvas->clipIRect(image->bounds()); canvas->drawImage(image, 0, 0, SkSamplingOptions(), &paint); } namespace skiagm { // This GM draws a colorful grids with different blur settings. class ImageBlurRepeatModeGM : public GM { public: ImageBlurRepeatModeGM() { this->setBGColor(0xFFCCCCCC); } protected: SkString getName() const override { return SkString("imageblurrepeatmode"); } SkISize getISize() override { return SkISize::Make(850, 920); } bool runAsBench() const override { return true; } void onDraw(SkCanvas* canvas) override { sk_sp image[] = { make_image(canvas, 1), make_image(canvas, 2), make_image(canvas, 3) }; sk_sp filter; canvas->translate(0, 30); // Test different kernel size, including the one to launch 2d Gaussian // blur. for (auto sigma: { 0.6f, 3.0f, 8.0f, 20.0f }) { // FIXME crops canvas->save(); filter = SkImageFilters::Blur( sigma, 0.0f, SkTileMode::kRepeat, nullptr, image[0]->bounds()); draw_image(canvas, image[0], std::move(filter)); canvas->translate(image[0]->width() + 20, 0); filter = SkImageFilters::Blur( 0.0f, sigma, SkTileMode::kRepeat, nullptr, image[1]->bounds()); draw_image(canvas, image[1], std::move(filter)); canvas->translate(image[1]->width() + 20, 0); filter = SkImageFilters::Blur( sigma, sigma, SkTileMode::kRepeat, nullptr, image[2]->bounds()); draw_image(canvas, image[2], std::move(filter)); canvas->translate(image[2]->width() + 20, 0); canvas->restore(); canvas->translate(0, image[0]->height() + 20); } } private: using INHERITED = GM; }; ////////////////////////////////////////////////////////////////////////////// DEF_GM(return new ImageBlurRepeatModeGM;) } // namespace skiagm // See skbug.com/10145 for more context, but if the blur doesn't have its own crop rect and // the canvas is not clipped, repeat can behave strangely (before fixes, this meant: // 1. The filtered results became semi-transparent when they should have remained opaque. // 2. The filtered results clip to 3xSigma, which makes sense for the decal tile mode, but not // the others. // 3. The repeat filter interacts non-intuitively when an expanded clip rect intersects the draw // geometry (it repeats across the edges of the intersection instead of repeating across the // draw and then clipping)). DEF_SIMPLE_GM(imageblurrepeatunclipped, canvas, 256, 128) { // To show translucency auto checkerboard = ToolUtils::create_checkerboard_image(256, 128, SK_ColorLTGRAY, SK_ColorGRAY, 8); canvas->drawImage(checkerboard, 0, 0); // Make an image with one red and one blue band SkBitmap bmp; bmp.allocN32Pixels(100, 20); bmp.eraseArea(SkIRect::MakeWH(100, 10), SK_ColorRED); bmp.eraseArea(SkIRect::MakeXYWH(0, 10, 100, 10), SK_ColorBLUE); auto img = bmp.asImage(); // The blur filter uses a repeat crop applied to the image bounds to define the tiling geometry, // but the crop IF is created directly since the tilemode factory for ::Blur also adds a kDecal // post-crop that is undesired for this GM. auto filter = SkImageFilters::Blur(0, 10, SkImageFilters::Crop(SkRect::Make(img->bounds()), SkTileMode::kRepeat, nullptr)); SkPaint paint; paint.setImageFilter(std::move(filter)); // Draw the blurred image once with a clip that shows the repeat is tiled several times. // 3xsigma is used to match the historic, but underspecified behavior for when kRepeat was used // with no crop rect (which must now be provided or kRepeat is ignored). canvas->translate(0, 50); canvas->save(); canvas->clipIRect(img->bounds().makeOutset(0, 30)); canvas->drawImage(img, 0, 0, SkSamplingOptions(), &paint); canvas->restore(); // Draw the blurred image with a clip positioned such that the draw would be excluded except // that the image filter causes it to intersect with the clip. It should look like the // left image, but clipped to the debug-black rectangle. canvas->translate(110, 0); canvas->save(); canvas->clipIRect(SkIRect::MakeXYWH(0, -30, 100, 10)); canvas->drawImage(img, 0, 0, SkSamplingOptions(), &paint); canvas->restore(); // Visualize the clip SkPaint line; line.setStyle(SkPaint::kStroke_Style); canvas->drawRect(SkRect::MakeXYWH(0, -30, 99, 9), line); }