| /* |
| * Copyright 2019 Google Inc. |
| * |
| * Use of this source code is governed by a BSD-style license that can be |
| * found in the LICENSE file. |
| */ |
| #ifndef SkScalingCodec_DEFINED |
| #define SkScalingCodec_DEFINED |
| |
| #include "include/codec/SkCodec.h" |
| |
| // Helper class for an SkCodec that supports arbitrary downscaling. |
| class SkScalingCodec : public SkCodec { |
| protected: |
| SkScalingCodec(SkEncodedInfo&& info, XformFormat srcFormat, std::unique_ptr<SkStream> stream, |
| SkEncodedOrigin origin = kTopLeft_SkEncodedOrigin) |
| : INHERITED(std::move(info), srcFormat, std::move(stream), origin) {} |
| |
| SkISize onGetScaledDimensions(float desiredScale) const override { |
| SkISize dim = this->dimensions(); |
| // SkCodec treats zero dimensional images as errors, so the minimum size |
| // that we will recommend is 1x1. |
| dim.fWidth = std::max(1, SkScalarRoundToInt(desiredScale * dim.fWidth)); |
| dim.fHeight = std::max(1, SkScalarRoundToInt(desiredScale * dim.fHeight)); |
| return dim; |
| } |
| |
| bool onDimensionsSupported(const SkISize& requested) override { |
| SkISize dim = this->dimensions(); |
| int w = requested.width(); |
| int h = requested.height(); |
| return 1 <= w && w <= dim.width() && 1 <= h && h <= dim.height(); |
| } |
| |
| private: |
| typedef SkCodec INHERITED; |
| }; |
| |
| #endif // SkScalingCodec_DEFINED |