mirror of
https://github.com/Ylianst/MeshAgent
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126 lines
3.5 KiB
C
126 lines
3.5 KiB
C
/*
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Copyright 2010 - 2011 Intel Corporation
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Licensed under the Apache License, Version 2.0 (the "License");
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you may not use this file except in compliance with the License.
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You may obtain a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing, software
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distributed under the License is distributed on an "AS IS" BASIS,
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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See the License for the specific language governing permissions and
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limitations under the License.
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*/
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#include "linux_compression.h"
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#include "../../../microstack/ILibParsers.h"
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#if defined(JPEGMAXBUF)
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#define MAX_TILE_SIZE JPEGMAXBUF
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#else
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#define MAX_TILE_SIZE 65500
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#endif
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unsigned char *jpeg_buffer = NULL;
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int jpeg_buffer_length = 0;
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char jpegLastError[JMSG_LENGTH_MAX];
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JPEG_error_handler default_JPEG_error_handler = NULL;
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void jpeg_error_handler(j_common_ptr ptr)
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{
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// Build the error string
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(*(ptr->err->format_message)) (ptr, jpegLastError);
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if (default_JPEG_error_handler != NULL) { default_JPEG_error_handler(jpegLastError); }
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exit(1);
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}
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void init_destination(j_compress_ptr cinfo)
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{
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JOCTET * next_output_byte;
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if (jpeg_buffer != NULL) { free(jpeg_buffer); }
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if ((jpeg_buffer = malloc(MAX_BUFFER)) == NULL) { ILIBCRITICALEXIT(254); }
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jpeg_buffer_length = 0;
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next_output_byte = jpeg_buffer;
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cinfo->dest->next_output_byte = next_output_byte;
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cinfo->dest->free_in_buffer = MAX_BUFFER;
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}
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boolean empty_output_buffer(j_compress_ptr cinfo)
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{
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JOCTET * next_output_byte;
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jpeg_buffer_length += MAX_BUFFER;
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if ((jpeg_buffer = (unsigned char *)realloc(jpeg_buffer, jpeg_buffer_length + MAX_BUFFER)) == NULL) { ILIBCRITICALEXIT(254); }
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next_output_byte = jpeg_buffer + jpeg_buffer_length;
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cinfo->dest->next_output_byte = next_output_byte;
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cinfo->dest->free_in_buffer = MAX_BUFFER;
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#if MAX_TILE_SIZE > 0
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if ( jpeg_buffer_length > MAX_TILE_SIZE) return FALSE;
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#endif
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return TRUE;
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}
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void term_destination (j_compress_ptr cinfo)
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{
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int remaining_buff_length = MAX_BUFFER - cinfo->dest->free_in_buffer;
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jpeg_buffer_length += remaining_buff_length;
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#if MAX_TILE_SIZE > 0
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if (jpeg_buffer_length > MAX_TILE_SIZE)
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{
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free(jpeg_buffer);
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jpeg_buffer = NULL;
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}
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else
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#endif
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{
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if ((jpeg_buffer = (unsigned char *)realloc(jpeg_buffer, jpeg_buffer_length)) == NULL) { ILIBCRITICALEXIT(254); }
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}
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}
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int write_JPEG_buffer (JSAMPLE * image_buffer, int image_width, int image_height, int quality)
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{
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struct jpeg_compress_struct cinfo;
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struct jpeg_error_mgr jerr;
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JSAMPROW row_pointer[1];
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int row_stride;
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cinfo.err = jpeg_std_error(&jerr);
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if (default_JPEG_error_handler != NULL) { jerr.error_exit = jpeg_error_handler; }
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jpeg_create_compress(&cinfo);
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cinfo.dest = (struct jpeg_destination_mgr *) malloc (sizeof(struct jpeg_destination_mgr));
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cinfo.dest->init_destination = &init_destination;
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cinfo.dest->empty_output_buffer = &empty_output_buffer;
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cinfo.dest->term_destination = &term_destination;
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cinfo.image_width = image_width;
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cinfo.image_height = image_height;
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cinfo.input_components = 3;
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cinfo.in_color_space = JCS_RGB;
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jpeg_set_defaults(&cinfo);
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jpeg_set_quality(&cinfo, quality, TRUE);
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jpeg_start_compress(&cinfo, TRUE);
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row_stride = image_width * 3;
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while (cinfo.next_scanline < cinfo.image_height)
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{
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row_pointer[0] = & image_buffer[cinfo.next_scanline * row_stride];
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(void) jpeg_write_scanlines(&cinfo, row_pointer, 1);
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}
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jpeg_finish_compress(&cinfo);
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free(cinfo.dest);
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cinfo.dest = NULL;
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jpeg_destroy_compress(&cinfo);
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return 0;
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}
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