161 lines
3.5 KiB
C
161 lines
3.5 KiB
C
/*
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This file is part of Iceball.
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Iceball 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 3 of the License, or
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(at your option) any later version.
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Iceball 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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You should have received a copy of the GNU General Public License
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along with Iceball. If not, see <http://www.gnu.org/licenses/>.
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*/
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#include "common.h"
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uint32_t img_convert_color_to_32(uint32_t v, int bits)
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{
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switch(bits)
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{
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case 16:
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return 0xFF000000*((v>>15)&1)
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+ ((v&0x001F)<<3)
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+ ((v&0x03E0)<<6)
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+ ((v&0x7C00)<<9);
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case 24:
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return 0xFF000000 + (v&0x00FFFFFF);
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case 32:
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return v;
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default:
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// not supported, just return 0xFF000000
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return 0xFF000000;
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}
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}
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void img_free(img_t *img)
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{
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free(img);
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}
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img_t *img_parse_tga(int len, const char *data)
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{
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// TODO: make this routine safer
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// it's possible to crash this in a whole bunch of ways
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const char *p = data;
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const char *dend = data+len;
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int x,y,i;
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img_tgahead_t head;
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// read header
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memcpy(&head, p, sizeof(img_tgahead_t));
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p += sizeof(img_tgahead_t);
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// skip ID field
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p += head.idlen;
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// jump to palette
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// load palette if necessary
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uint32_t *palette = (head.cmtype == 1 ? malloc(head.cmlen*4) : NULL);
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if(palette != NULL)
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for(i = 0; i < head.cmlen; i++)
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{
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// TODO check what happens when the offset is different
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uint32_t tmp_col;
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int tclen = ((head.cmbpp-1)>>3)+1;
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memcpy(&tmp_col, p, tclen);
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p += tclen;
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palette[i] = img_convert_color_to_32(tmp_col, head.cmbpp);
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//printf("%6i %08X\n", i, palette[i]);
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}
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// allocate + stash
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img_t *img = malloc(sizeof(img_t)+4*head.width*head.height);
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// TODO: check if NULL
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img->head = head;
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img->udtype = UD_IMG;
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// copy stuff
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int bplen = ((head.bpp-1)>>3)+1;
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int idx = (head.flags & 32 ? 0 : head.height-1)*head.width;
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for(y = 0; y < head.height; y++)
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{
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if(head.imgtype & 8)
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{
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// RLE
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x = 0;
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uint32_t tmp_col;
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while(x < head.width)
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{
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int rle = (int)(uint8_t)(*p++);
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if(rle & 0x80)
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{
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rle &= 0x7F;
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memcpy(&tmp_col, p, bplen);
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p += bplen;
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// TODO: clip at width
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for(i = 0; i <= rle; i++, x++)
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img->pixels[idx++] = tmp_col;
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} else {
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// TODO: clip at width
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for(i = 0; i <= rle; i++, x++)
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{
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memcpy(&tmp_col, p, bplen);
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p += bplen;
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img->pixels[idx++] = tmp_col;
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}
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}
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}
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} else {
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// raw
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uint32_t tmp_col;
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for(x = 0; x < head.width; x++)
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{
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memcpy(&tmp_col, p, bplen);
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p += bplen;
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img->pixels[idx++] = tmp_col;
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}
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}
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if(!(head.flags & 32))
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idx -= 2*head.width;
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}
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// convert pixels
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if((head.imgtype&7) == 1)
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{
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for(i = head.width*head.height-1; i >= 0; i--)
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img->pixels[i] = palette[(img->pixels[i] + head.cmoffs) % head.cmlen];
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//printf("cm %i %i\n", head.cmoffs, head.cmlen);
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} else {
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for(i = head.width*head.height-1; i >= 0; i--)
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img->pixels[i] = img_convert_color_to_32(img->pixels[i], head.bpp);
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}
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// free palette
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free(palette);
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// now return!
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return img;
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}
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img_t *img_load_tga(const char *fname)
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{
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int flen;
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char *buf = net_fetch_file(fname, &flen);
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if(buf == NULL)
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return NULL;
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img_t *ret = img_parse_tga(flen, buf);
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free(buf);
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return ret;
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}
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