| /* |
| * Copyright (C) 2013 Apple Inc. All rights reserved. |
| * Copyright (C) 2013 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 |
| * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, |
| * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT |
| * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, |
| * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY |
| * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
| * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE |
| * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
| */ |
| |
| #ifndef THIRD_PARTY_BLINK_RENDERER_CORE_HTML_PARSER_HTML_SRCSET_PARSER_H_ |
| #define THIRD_PARTY_BLINK_RENDERER_CORE_HTML_PARSER_HTML_SRCSET_PARSER_H_ |
| |
| #include "third_party/blink/renderer/core/core_export.h" |
| #include "third_party/blink/renderer/platform/wtf/allocator.h" |
| #include "third_party/blink/renderer/platform/wtf/text/string_view.h" |
| #include "third_party/blink/renderer/platform/wtf/text/wtf_string.h" |
| |
| namespace blink { |
| |
| class Document; |
| |
| enum { kUninitializedDescriptor = -1 }; |
| |
| class DescriptorParsingResult { |
| STACK_ALLOCATED(); |
| |
| public: |
| DescriptorParsingResult() |
| : density_(kUninitializedDescriptor), |
| resource_width_(kUninitializedDescriptor), |
| resource_height_(kUninitializedDescriptor) {} |
| |
| bool HasDensity() const { return density_ >= 0; } |
| bool HasWidth() const { return resource_width_ >= 0; } |
| bool HasHeight() const { return resource_height_ >= 0; } |
| |
| float Density() const { |
| DCHECK(HasDensity()); |
| return density_; |
| } |
| unsigned GetResourceWidth() const { |
| DCHECK(HasWidth()); |
| return resource_width_; |
| } |
| unsigned ResourceHeight() const { |
| DCHECK(HasHeight()); |
| return resource_height_; |
| } |
| |
| void SetResourceWidth(int width) { |
| DCHECK_GE(width, 0); |
| resource_width_ = (unsigned)width; |
| } |
| void SetResourceHeight(int height) { |
| DCHECK_GE(height, 0); |
| resource_height_ = (unsigned)height; |
| } |
| void SetDensity(float density_to_set) { |
| DCHECK_GE(density_to_set, 0); |
| density_ = density_to_set; |
| } |
| |
| private: |
| float density_; |
| int resource_width_; |
| int resource_height_; |
| }; |
| |
| class ImageCandidate { |
| DISALLOW_NEW(); |
| |
| public: |
| enum OriginAttribute { kSrcsetOrigin, kSrcOrigin }; |
| |
| ImageCandidate() |
| : density_(1.0), |
| resource_width_(kUninitializedDescriptor), |
| origin_attribute_(kSrcsetOrigin) {} |
| |
| ImageCandidate(const String& source, |
| unsigned start, |
| unsigned length, |
| const DescriptorParsingResult& result, |
| OriginAttribute origin_attribute) |
| : source_(source), |
| string_(source, start, length), |
| density_(result.HasDensity() ? result.Density() |
| : kUninitializedDescriptor), |
| resource_width_(result.HasWidth() ? result.GetResourceWidth() |
| : kUninitializedDescriptor), |
| origin_attribute_(origin_attribute) {} |
| |
| String ToString() const { return string_.ToString(); } |
| |
| AtomicString Url() const { return AtomicString(ToString()); } |
| |
| void SetDensity(float factor) { density_ = factor; } |
| |
| float Density() const { return density_; } |
| |
| int GetResourceWidth() const { return resource_width_; } |
| |
| bool SrcOrigin() const { return (origin_attribute_ == kSrcOrigin); } |
| |
| inline bool IsEmpty() const { return string_.IsEmpty(); } |
| |
| private: |
| String source_; // Keep the StringView buffer alive. |
| StringView string_; |
| float density_; |
| int resource_width_; |
| OriginAttribute origin_attribute_; |
| }; |
| |
| ImageCandidate BestFitSourceForSrcsetAttribute(float device_scale_factor, |
| float source_size, |
| const String& srcset_attribute, |
| Document* = nullptr); |
| |
| CORE_EXPORT ImageCandidate |
| BestFitSourceForImageAttributes(float device_scale_factor, |
| float source_size, |
| const String& src_attribute, |
| const String& srcset_attribute, |
| Document* = nullptr); |
| |
| String BestFitSourceForImageAttributes(float device_scale_factor, |
| float source_size, |
| const String& src_attribute, |
| ImageCandidate& srcset_image_candidate); |
| |
| } // namespace blink |
| |
| #endif |