-static int decode_rle(CamtasiaContext *c, unsigned int srcsize)
-{
- unsigned char *src = c->decomp_buf;
- unsigned char *output, *output_end;
- int p1, p2, line=c->height, pos=0, i;
-
- output = c->pic.data[0] + (c->height - 1) * c->pic.linesize[0];
- output_end = c->pic.data[0] + (c->height) * c->pic.linesize[0];
- while(src < c->decomp_buf + srcsize) {
- p1 = *src++;
- if(p1 == 0) { //Escape code
- p2 = *src++;
- if(p2 == 0) { //End-of-line
- output = c->pic.data[0] + (--line) * c->pic.linesize[0];
- if (line < 0)
- return -1;
- pos = 0;
- continue;
- } else if(p2 == 1) { //End-of-picture
- return 0;
- } else if(p2 == 2) { //Skip
- p1 = *src++;
- p2 = *src++;
- line -= p2;
- if (line < 0)
- return -1;
- pos += p1;
- output = c->pic.data[0] + line * c->pic.linesize[0] + pos * (c->bpp / 8);
- continue;
- }
- // Copy data
- if (output + p2 * (c->bpp / 8) > output_end) {
- src += p2 * (c->bpp / 8);
- continue;
- }
- for(i = 0; i < p2 * (c->bpp / 8); i++) {
- *output++ = *src++;
- }
- // RLE8 copy is actually padded - and runs are not!
- if(c->bpp == 8 && (p2 & 1)) {
- src++;
- }
- pos += p2;
- } else { //Run of pixels
- int pix[4]; //original pixel
- switch(c->bpp){
- case 8: pix[0] = *src++;
- break;
- case 16: pix[0] = *src++;
- pix[1] = *src++;
- break;
- case 24: pix[0] = *src++;
- pix[1] = *src++;
- pix[2] = *src++;
- break;
- case 32: pix[0] = *src++;
- pix[1] = *src++;
- pix[2] = *src++;
- pix[3] = *src++;
- break;
- }
- if (output + p1 * (c->bpp / 8) > output_end)
- continue;
- for(i = 0; i < p1; i++) {
- switch(c->bpp){
- case 8: *output++ = pix[0];
- break;
- case 16: *output++ = pix[0];
- *output++ = pix[1];
- break;
- case 24: *output++ = pix[0];
- *output++ = pix[1];
- *output++ = pix[2];
- break;
- case 32: *output++ = pix[0];
- *output++ = pix[1];
- *output++ = pix[2];
- *output++ = pix[3];
- break;
- }
- }
- pos += p1;
- }
- }
-
- av_log(c->avctx, AV_LOG_ERROR, "Camtasia warning: no End-of-picture code\n");
- return 1;
-}