71 lines
3.1 KiB
C
71 lines
3.1 KiB
C
/* Copyright 2018 Bernhard R. Fischer, 4096R/8E24F29D <bf@abenteuerland.at>
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*
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* This file is part of Cairo_JPG.
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*
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* Cairo_JPG is free software: you can redistribute it and/or modify
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* it under the terms of the GNU Lesser General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* Cairo_JPG is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with Cairo_JPG. If not, see <https://www.gnu.org/licenses/>.
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*/
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#ifndef CAIRO_JPEG_H
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#define CAIRO_JPEG_H
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/*! \file cairo_jpg.h
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* This file contains all prototypes for the Cairo-JPEG functions implemented
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* in cairo_jpg.c. See there for the function documentation.
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*
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* @author Bernhard R. Fischer, 4096R/8E24F29D <bf@abenteuerland.at>
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* @version 2018/12/11
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* @license LGPL3
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*/
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#ifdef HAVE_CONFIG_H
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#include "config.h"
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#endif
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#include <cairo.h>
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#ifdef USE_CAIRO_READ_FUNC_LEN_T
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/*! This is the type for the stream read function. Which must be implemented by
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* the user if cairo_image_surface_create_from_jpeg_stream() is used. Please
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* note that this prototype is slightly different from cairo_read_func_t which
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* is used by cairo_image_surface_create_from_png_stream().
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* This new prototype is defined because the original prototype
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* cairo_read_func_t does not allow to detect truncated reads. This issue was
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* discussed on the cairographics mailinglist, see
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* https://lists.cairographics.org/archives/cairo/2016-March/027298.html
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* @param closure This parameter is directly passed through by
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* cairo_image_surface_create_from_jpeg_stream().
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* @param data Pointer to data buffer which will receive the data.
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* @param length Size of the data buffer in bytes.
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* @return This function must return the actually length that was read into the
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* buffer. This may actually be less than length which indicates an EOF. In
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* case of any fatal unrecoverable error on the input stream -1 shall be
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* returned.
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*/
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typedef ssize_t (*cairo_read_func_len_t) (void *closure, unsigned char *data, unsigned int length);
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#endif
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cairo_status_t cairo_image_surface_write_to_jpeg_mem(cairo_surface_t *sfc, unsigned char **data, size_t *len, int quality);
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cairo_status_t cairo_image_surface_write_to_jpeg_stream(cairo_surface_t *sfc, cairo_write_func_t write_func, void *closure, int quality);
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cairo_status_t cairo_image_surface_write_to_jpeg(cairo_surface_t *sfc, const char *filename, int quality);
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cairo_surface_t *cairo_image_surface_create_from_jpeg_mem(void *data, size_t len);
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#ifdef USE_CAIRO_READ_FUNC_LEN_T
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cairo_surface_t *cairo_image_surface_create_from_jpeg_stream(cairo_read_func_len_t read_func, void *closure);
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#else
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cairo_surface_t *cairo_image_surface_create_from_jpeg_stream(cairo_read_func_t read_func, void *closure);
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#endif
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cairo_surface_t *cairo_image_surface_create_from_jpeg(const char *filename);
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#endif
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