| /* |
| * Copyright (c) 2006,2007,2008, Google Inc. All rights reserved. |
| * |
| * Redistribution and use in source and binary forms, with or without |
| * modification, are permitted provided that the following conditions are |
| * met: |
| * |
| * * Redistributions of source code must retain the above copyright |
| * notice, this list of conditions and the following disclaimer. |
| * * Redistributions in binary form must reproduce the above |
| * copyright notice, this list of conditions and the following disclaimer |
| * in the documentation and/or other materials provided with the |
| * distribution. |
| * * Neither the name of Google Inc. nor the names of its |
| * contributors may be used to endorse or promote products derived from |
| * this software without specific prior written permission. |
| * |
| * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS |
| * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT |
| * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR |
| * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT |
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| * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
| */ |
| |
| // All of the functions in this file should move to new homes and this file |
| // should be deleted. |
| |
| #ifndef THIRD_PARTY_BLINK_RENDERER_PLATFORM_GRAPHICS_SKIA_SKIA_UTILS_H_ |
| #define THIRD_PARTY_BLINK_RENDERER_PLATFORM_GRAPHICS_SKIA_SKIA_UTILS_H_ |
| |
| #include "cc/paint/paint_canvas.h" |
| #include "third_party/blink/renderer/platform/graphics/graphics_types.h" |
| #include "third_party/blink/renderer/platform/graphics/image.h" |
| #include "third_party/blink/renderer/platform/platform_export.h" |
| #include "third_party/blink/renderer/platform/transforms/affine_transform.h" |
| #include "third_party/blink/renderer/platform/wtf/math_extras.h" |
| #include "third_party/skia/include/core/SkCanvas.h" |
| #include "third_party/skia/include/core/SkColor.h" |
| #include "third_party/skia/include/core/SkPoint.h" |
| #include "third_party/skia/include/core/SkRefCnt.h" |
| #include "third_party/skia/include/core/SkScalar.h" |
| |
| namespace blink { |
| |
| /**** constants ****/ |
| |
| enum { |
| // Firefox limits width/height to 32767 pixels, but slows down dramatically |
| // before it reaches that limit. We limit by area instead, giving us larger |
| // maximum dimensions, in exchange for a smaller maximum canvas size. |
| kMaxCanvasArea = 32768 * 8192, // Maximum canvas area in CSS pixels |
| |
| // In Skia, we will also limit width/height to 65535. |
| kMaxSkiaDim = 65535 // Maximum width/height in CSS pixels. |
| }; |
| |
| bool PLATFORM_EXPORT IsValidImageSize(const IntSize&); |
| |
| SkBlendMode PLATFORM_EXPORT |
| WebCoreCompositeToSkiaComposite(CompositeOperator, |
| BlendMode = BlendMode::kNormal); |
| SkBlendMode PLATFORM_EXPORT WebCoreBlendModeToSkBlendMode(BlendMode); |
| CompositeOperator PLATFORM_EXPORT CompositeOperatorFromSkBlendMode(SkBlendMode); |
| BlendMode PLATFORM_EXPORT BlendModeFromSkBlendMode(SkBlendMode); |
| |
| // Multiply a color's alpha channel by an additional alpha factor where |
| // alpha is in the range [0, 1]. |
| SkColor PLATFORM_EXPORT ScaleAlpha(SkColor, float); |
| |
| // Convert a SkColorSpace to a gfx::ColorSpace |
| gfx::ColorSpace PLATFORM_EXPORT |
| SkColorSpaceToGfxColorSpace(const sk_sp<SkColorSpace>); |
| |
| bool PLATFORM_EXPORT |
| ApproximatelyEqualSkColorSpaces(sk_sp<SkColorSpace> src_color_space, |
| sk_sp<SkColorSpace> dst_color_space); |
| |
| // Skia has problems when passed infinite, etc floats, filter them to 0. |
| inline SkScalar WebCoreFloatToSkScalar(float f) { |
| return SkFloatToScalar(std::isfinite(f) ? f : 0); |
| } |
| |
| inline SkScalar WebCoreDoubleToSkScalar(double d) { |
| return SkDoubleToScalar(std::isfinite(d) ? d : 0); |
| } |
| |
| inline bool WebCoreFloatNearlyEqual(float a, float b) { |
| return SkScalarNearlyEqual(WebCoreFloatToSkScalar(a), |
| WebCoreFloatToSkScalar(b)); |
| } |
| |
| inline SkPath::FillType WebCoreWindRuleToSkFillType(WindRule rule) { |
| return static_cast<SkPath::FillType>(rule); |
| } |
| |
| inline WindRule SkFillTypeToWindRule(SkPath::FillType fill_type) { |
| switch (fill_type) { |
| case SkPath::kWinding_FillType: |
| case SkPath::kEvenOdd_FillType: |
| return static_cast<WindRule>(fill_type); |
| default: |
| NOTREACHED(); |
| break; |
| } |
| return RULE_NONZERO; |
| } |
| |
| inline SkPoint FloatPointToSkPoint(const FloatPoint& point) { |
| return SkPoint::Make(WebCoreFloatToSkScalar(point.X()), |
| WebCoreFloatToSkScalar(point.Y())); |
| } |
| |
| SkMatrix PLATFORM_EXPORT AffineTransformToSkMatrix(const AffineTransform&); |
| |
| bool NearlyIntegral(float value); |
| |
| InterpolationQuality ComputeInterpolationQuality(float src_width, |
| float src_height, |
| float dest_width, |
| float dest_height, |
| bool is_data_complete = true); |
| |
| // This replicates the old skia behavior when it used to take radius for blur. |
| // Now it takes sigma. |
| inline SkScalar SkBlurRadiusToSigma(SkScalar radius) { |
| SkASSERT(radius >= 0); |
| if (radius == 0) |
| return 0.0f; |
| return 0.288675f * radius + 0.5f; |
| } |
| |
| template <typename PrimitiveType> |
| void DrawPlatformFocusRing(const PrimitiveType&, |
| cc::PaintCanvas*, |
| SkColor, |
| float width); |
| |
| // TODO(fmalita): remove in favor of direct SrcRectConstraint use. |
| inline cc::PaintCanvas::SrcRectConstraint |
| WebCoreClampingModeToSkiaRectConstraint(Image::ImageClampingMode clamp_mode) { |
| return clamp_mode == Image::kClampImageToSourceRect |
| ? cc::PaintCanvas::kStrict_SrcRectConstraint |
| : cc::PaintCanvas::kFast_SrcRectConstraint; |
| } |
| |
| // Skia's smart pointer APIs are preferable over their legacy raw pointer |
| // counterparts. |
| // |
| // General guidelines |
| // |
| // When receiving ref counted objects from Skia: |
| // |
| // 1) Use sk_sp-based Skia factories if available (e.g. SkShader::MakeFoo() |
| // instead of SkShader::CreateFoo()). |
| // 2) Use sk_sp<T> locals for all objects. |
| // |
| // When passing ref counted objects to Skia: |
| // |
| // 1) Use sk_sp-based Skia APIs when available (e.g. |
| // SkPaint::setShader(sk_sp<SkShader>) instead of |
| // SkPaint::setShader(SkShader*)). |
| // 2) If object ownership is being passed to Skia, use std::move(sk_sp<T>). |
| // |
| // Example (creating a SkShader and setting it on SkPaint): |
| // |
| // a) ownership transferred |
| // |
| // // using Skia smart pointer locals |
| // sk_sp<SkShader> shader = SkShader::MakeFoo(...); |
| // paint.setShader(std::move(shader)); |
| // |
| // // using no locals |
| // paint.setShader(SkShader::MakeFoo(...)); |
| // |
| // b) shared ownership |
| // |
| // sk_sp<SkShader> shader = SkShader::MakeFoo(...); |
| // paint.setShader(shader); |
| |
| } // namespace blink |
| |
| #endif // THIRD_PARTY_BLINK_RENDERER_PLATFORM_GRAPHICS_SKIA_SKIA_UTILS_H_ |