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55 lines
2.3 KiB
C++
55 lines
2.3 KiB
C++
/*
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* Copyright (c) 2023 the ThorVG project. All rights reserved.
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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 TVG_GIF_ENCODER_H
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#define TVG_GIF_ENCODER_H
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#include <stdio.h>
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#include <cstdint>
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typedef struct
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{
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FILE* f;
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uint8_t* oldImage;
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bool firstFrame;
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} GifWriter;
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// Creates a gif file.
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// The input GIFWriter is assumed to be uninitialized.
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// The delay value is the time between frames in hundredths of a second - note that not all viewers pay much attention to this value.
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bool gifBegin(GifWriter* writer, const char* filename, uint32_t width, uint32_t height, uint32_t delay);
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// Writes out a new frame to a GIF in progress.
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// The GIFWriter should have been created by GIFBegin.
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// AFAIK, it is legal to use different bit depths for different frames of an image -
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// this may be handy to save bits in animations that don't change much.
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bool gifWriteFrame(GifWriter* writer, const uint8_t* image, uint32_t width, uint32_t height, uint32_t delay, bool transparent);
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// Writes the EOF code, closes the file handle, and frees temp memory used by a GIF.
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// Many if not most viewers will still display a GIF properly if the EOF code is missing,
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// but it's still a good idea to write it out.
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bool gifEnd(GifWriter* writer);
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#endif //TVG_GIF_ENCODER_H
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