mirror of
https://github.com/kichikuou/xsystem35-sdl2.git
synced 2026-10-01 19:28:00 +03:00
73 lines
2.1 KiB
C
73 lines
2.1 KiB
C
/*
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* Copyright (C) 2020 <KichikuouChrome@gmail.com>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program 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 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 this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*
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*/
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#include <stdio.h>
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#include <stdlib.h>
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#include <jpeglib.h>
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#undef max
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#undef min
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#include "config.h"
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#include "system.h"
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#include "ags.h"
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#include "jpeg.h"
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boolean jpeg_checkfmt(BYTE *data) {
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return data[0] == 0xff && data[1] == 0xd8;
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}
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cgdata *jpeg_extract(BYTE *data, size_t size) {
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struct jpeg_decompress_struct cinfo;
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struct jpeg_error_mgr jerr;
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// TODO: Error handling
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cinfo.err = jpeg_std_error(&jerr);
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jpeg_create_decompress(&cinfo);
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jpeg_mem_src(&cinfo, data, size);
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if (jpeg_read_header(&cinfo, TRUE) != JPEG_HEADER_OK) {
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WARNING("jpeg_read_header failed\n");
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jpeg_destroy_decompress(&cinfo);
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return NULL;
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}
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jpeg_start_decompress(&cinfo);
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cgdata *cg = calloc(1, sizeof(cgdata));
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cg->type = ALCG_JPEG;
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cg->width = cinfo.output_width;
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cg->height = cinfo.output_height;
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cg->pic = malloc(sizeof(WORD) * cg->width * cg->height);
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int row_stride = cinfo.output_width * cinfo.output_components;
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JSAMPARRAY buffer = (*cinfo.mem->alloc_sarray)((j_common_ptr) &cinfo, JPOOL_IMAGE, row_stride, 1);
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WORD *dst = (WORD *)cg->pic;
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while (cinfo.output_scanline < cinfo.output_height) {
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jpeg_read_scanlines(&cinfo, buffer, 1);
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for (int x = 0; x < cinfo.output_width; x++)
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*dst++ = PIX16(buffer[0][x * 3], buffer[0][x * 3 + 1], buffer[0][x * 3 + 2]);
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}
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jpeg_finish_decompress(&cinfo);
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jpeg_destroy_decompress(&cinfo);
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return cg;
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}
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