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- // Copyright (c) 2017 The Chromium Authors. All rights reserved.
- // 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/paint_image_builder.h"
- #include "third_party/skia/include/core/SkColorFilter.h"
- #include "third_party/skia/include/core/SkMaskFilter.h"
- #include "third_party/skia/include/effects/SkGradientShader.h"
- #include "third_party/skia/include/effects/SkLayerDrawLooper.h"
- #include "ui/gfx/geometry/skia_conversions.h"
- #include "ui/gfx/image/image_skia_rep.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<SkDrawLooper> CreateShadowDrawLooper(
- const std::vector<ShadowValue>& shadows) {
- if (shadows.empty())
- return nullptr;
- SkLayerDrawLooper::Builder looper_builder;
- looper_builder.addLayer(); // top layer of the original.
- SkLayerDrawLooper::LayerInfo layer_info;
- layer_info.fPaintBits |= SkLayerDrawLooper::kMaskFilter_Bit;
- layer_info.fPaintBits |= SkLayerDrawLooper::kColorFilter_Bit;
- layer_info.fColorMode = SkBlendMode::kSrc;
- for (size_t i = 0; i < shadows.size(); ++i) {
- const ShadowValue& shadow = shadows[i];
- layer_info.fOffset.set(SkIntToScalar(shadow.x()),
- SkIntToScalar(shadow.y()));
- SkPaint* paint = looper_builder.addLayer(layer_info);
- // Skia's blur radius defines the range to extend the blur from
- // original mask, which is half of blur amount as defined in ShadowValue.
- paint->setMaskFilter(SkMaskFilter::MakeBlur(
- kNormal_SkBlurStyle, RadiusToSigma(shadow.blur() / 2)));
- paint->setColorFilter(
- SkColorFilters::Blend(shadow.color(), SkBlendMode::kSrcIn));
- }
- return looper_builder.detach();
- }
- } // namespace gfx
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