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75 lines
2.2 KiB
C++
75 lines
2.2 KiB
C++
/*
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libheif example application "convert".
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MIT License
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Copyright (c) 2017 struktur AG, Joachim Bauch <bauch@struktur.de>
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Permission is hereby granted, free of charge, to any person obtaining a copy
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of this software and associated documentation files (the "Software"), to deal
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in the Software without restriction, including without limitation the rights
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to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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copies of the Software, and to permit persons to whom the Software is
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furnished to do so, subject to the following conditions:
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The above copyright notice and this permission notice shall be included in all
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copies or substantial portions of the Software.
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THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
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SOFTWARE.
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*/
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#ifndef EXAMPLE_ENCODER_JPEG_H
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#define EXAMPLE_ENCODER_JPEG_H
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#include <csetjmp>
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#include <cstddef>
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#include <cstdio>
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#include <jpeglib.h>
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#include <string>
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#include "encoder.h"
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class JpegEncoder : public Encoder
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{
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public:
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JpegEncoder(int quality);
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heif_colorspace colorspace(bool has_alpha) const override
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{
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return heif_colorspace_YCbCr;
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}
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heif_chroma chroma(bool has_alpha, int bit_depth) const override
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{
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return heif_chroma_420;
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}
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void UpdateDecodingOptions(const struct heif_image_handle* handle,
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struct heif_decoding_options* options) const override;
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bool Encode(const struct heif_image_handle* handle,
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const struct heif_image* image, const std::string& filename) override;
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private:
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static const int kDefaultQuality = 90;
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struct ErrorHandler
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{
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struct jpeg_error_mgr pub; /* "public" fields */
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jmp_buf setjmp_buffer; /* for return to caller */
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};
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static void OnJpegError(j_common_ptr cinfo);
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int quality_;
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};
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#endif // EXAMPLE_ENCODER_JPEG_H
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