| // Copyright 2017 The Chromium Authors |
| // Use of this source code is governed by a BSD-style license that can be |
| // found in the LICENSE file. |
| |
| #include "ui/gfx/skia_paint_util.h" |
| |
| #include "cc/paint/draw_looper.h" |
| #include "cc/paint/paint_image_builder.h" |
| #include "third_party/skia/include/core/SkColorFilter.h" |
| #include "third_party/skia/include/core/SkScalar.h" |
| #include "third_party/skia/include/effects/SkGradientShader.h" |
| #include "ui/gfx/geometry/skia_conversions.h" |
| #include "ui/gfx/image/image_skia_rep.h" |
| #include "ui/gfx/shadow_value.h" |
| #include "ui/gfx/switches.h" |
| |
| namespace gfx { |
| |
| sk_sp<cc::PaintShader> CreateImageRepShader(const gfx::ImageSkiaRep& image_rep, |
| SkTileMode tile_mode_x, |
| SkTileMode tile_mode_y, |
| const SkMatrix& local_matrix) { |
| return CreateImageRepShaderForScale(image_rep, tile_mode_x, tile_mode_y, |
| local_matrix, image_rep.scale()); |
| } |
| |
| sk_sp<cc::PaintShader> CreateImageRepShaderForScale( |
| const gfx::ImageSkiaRep& image_rep, |
| SkTileMode tile_mode_x, |
| SkTileMode tile_mode_y, |
| const SkMatrix& local_matrix, |
| SkScalar scale) { |
| // Unscale matrix by |scale| such that the bitmap is drawn at the |
| // correct density. |
| // Convert skew and translation to pixel coordinates. |
| // Thus, for |bitmap_scale| = 2: |
| // x scale = 2, x translation = 1 DIP, |
| // should be converted to |
| // x scale = 1, x translation = 2 pixels. |
| SkMatrix shader_scale = local_matrix; |
| shader_scale.preScale(scale, scale); |
| shader_scale.setScaleX(local_matrix.getScaleX() / scale); |
| shader_scale.setScaleY(local_matrix.getScaleY() / scale); |
| |
| // TODO(malaykeshav): The check for has_paint_image was only added here to |
| // prevent generating a paint record in tests. Tests need an instance of |
| // base::DiscardableMemoryAllocator to generate the PaintRecord. However most |
| // test suites don't have this set. |
| // https://crbug.com/891469 |
| if (!image_rep.has_paint_image()) { |
| return cc::PaintShader::MakePaintRecord( |
| image_rep.GetPaintRecord(), |
| SkRect::MakeIWH(image_rep.pixel_width(), image_rep.pixel_height()), |
| tile_mode_x, tile_mode_y, &shader_scale); |
| } else { |
| return cc::PaintShader::MakeImage(image_rep.paint_image(), tile_mode_x, |
| tile_mode_y, &shader_scale); |
| } |
| } |
| |
| sk_sp<cc::PaintShader> CreateGradientShader(const gfx::Point& start_point, |
| const gfx::Point& end_point, |
| SkColor start_color, |
| SkColor end_color) { |
| // TODO(crbug/1308932): Remove FromColor and make all SkColor4f. |
| SkColor4f grad_colors[2] = {SkColor4f::FromColor(start_color), |
| SkColor4f::FromColor(end_color)}; |
| SkPoint grad_points[2] = {gfx::PointToSkPoint(start_point), |
| gfx::PointToSkPoint(end_point)}; |
| |
| return cc::PaintShader::MakeLinearGradient(grad_points, grad_colors, nullptr, |
| 2, SkTileMode::kClamp); |
| } |
| |
| // This is copied from |
| // third_party/WebKit/Source/platform/graphics/skia/SkiaUtils.h |
| static SkScalar RadiusToSigma(double radius) { |
| return radius > 0 ? SkDoubleToScalar(0.288675f * radius + 0.5f) : 0; |
| } |
| |
| sk_sp<cc::DrawLooper> CreateShadowDrawLooper( |
| const std::vector<ShadowValue>& shadows) { |
| if (shadows.empty()) |
| return nullptr; |
| |
| cc::DrawLooperBuilder looper_builder; |
| |
| looper_builder.AddUnmodifiedContent(); // top layer of the original. |
| |
| for (const ShadowValue& shadow : shadows) { |
| looper_builder.AddShadow( |
| {SkIntToScalar(shadow.x()), SkIntToScalar(shadow.y())}, |
| RadiusToSigma(shadow.blur() / 2), SkColor4f::FromColor(shadow.color()), |
| cc::DrawLooper::kOverrideAlphaFlag); |
| } |
| |
| return looper_builder.Detach(); |
| } |
| |
| } // namespace gfx |