static int gif_parse_next_image(GifState *s, AVFrame *frame)
{
while (bytestream2_get_bytes_left(&s->gb) > 0) {
int code = bytestream2_get_byte(&s->gb);
int ret;
av_log(s->avctx, AV_LOG_DEBUG, "code=%02x '%c'\n", code, code);
switch (code) {
case GIF_IMAGE_SEPARATOR:
return gif_read_image(s, frame);
case GIF_EXTENSION_INTRODUCER:
if ((ret = gif_read_extension(s)) < 0)
return ret;
break;
case GIF_TRAILER:
/* end of image */
return AVERROR_EOF;
default:
/* erroneous block label */
return AVERROR_INVALIDDATA;
}
}
return AVERROR_EOF;
}
static int gif_parse_next_image(GifState *s)
{
int ret, code;
for (;;) {
code = bytestream_get_byte(&s->bytestream);
#ifdef DEBUG
dprintf("gif: code=%02x '%c'\n", code, code);
#endif
switch (code) {
case ',':
if (gif_read_image(s) < 0)
return -1;
ret = 0;
goto the_end;
case ';':
/* end of image */
ret = -1;
goto the_end;
case '!':
if (gif_read_extension(s) < 0)
return -1;
break;
case EOF:
default:
/* error or errneous EOF */
ret = -1;
goto the_end;
}
}
the_end:
return ret;
}
static int gif_parse_next_image(GifState *s, int *got_picture)
{
int ret;
*got_picture = sizeof(AVPicture);
while (s->bytestream < s->bytestream_end) {
int code = bytestream_get_byte(&s->bytestream);
av_dlog(s->avctx, "code=%02x '%c'\n", code, code);
switch (code) {
case GIF_IMAGE_SEPARATOR:
return gif_read_image(s);
case GIF_EXTENSION_INTRODUCER:
if ((ret = gif_read_extension(s)) < 0)
return ret;
break;
case GIF_TRAILER:
/* end of image */
*got_picture = 0;
return 0;
default:
/* erroneous block label */
return AVERROR_INVALIDDATA;
}
}
return AVERROR_EOF;
}
fz_pixmap *
fz_load_gif(fz_context *ctx, unsigned char *p, size_t total)
{
fz_pixmap *image;
struct info gif;
image = gif_read_image(ctx, &gif, p, total, 0);
image->xres = gif.xres;
image->yres = gif.yres;
return image;
}
void
fz_load_gif_info(fz_context *ctx, const unsigned char *p, size_t total, int *wp, int *hp, int *xresp, int *yresp, fz_colorspace **cspacep)
{
struct info gif;
gif_read_image(ctx, &gif, p, total, 1);
*cspacep = fz_keep_colorspace(ctx, fz_device_rgb(ctx));
*wp = gif.width;
*hp = gif.height;
*xresp = gif.xres;
*yresp = gif.yres;
}
static int gif_parse_next_image(GifState *s)
{
while (s->bytestream < s->bytestream_end) {
int code = bytestream_get_byte(&s->bytestream);
#ifdef DEBUG
dprintf(s->avctx, "gif: code=%02x '%c'\n", code, code);
#endif
switch (code) {
case ',':
return gif_read_image(s);
case '!':
if (gif_read_extension(s) < 0)
return -1;
break;
case ';':
/* end of image */
default:
/* error or erroneous EOF */
return -1;
}
}
return -1;
}
static int gif_parse_next_image(GifState *s, AVFrame *frame)
{
while (bytestream2_get_bytes_left(&s->gb) > 0) {
int code = bytestream2_get_byte(&s->gb);
int ret;
av_dlog(s->avctx, "gif: code=%02x '%c'\n", code, code);
switch (code) {
case ',':
return gif_read_image(s, frame);
case '!':
if ((ret = gif_read_extension(s)) < 0)
return ret;
break;
case ';':
/* end of image */
default:
/* error or erroneous EOF */
return AVERROR_INVALIDDATA;
}
}
return AVERROR_INVALIDDATA;
}
int /* O - Read status */
_cupsImageReadGIF(
cups_image_t *img, /* IO - cupsImage */
FILE *fp, /* I - cupsImage file */
cups_icspace_t primary, /* I - Primary choice for colorspace */
cups_icspace_t secondary, /* I - Secondary choice for colorspace */
int saturation, /* I - Color saturation (%) */
int hue, /* I - Color hue (degrees) */
const cups_ib_t *lut) /* I - Lookup table for gamma/brightness */
{
unsigned char buf[1024]; /* Input buffer */
gif_cmap_t cmap; /* Colormap */
int i, /* Looping var */
bpp, /* Bytes per pixel */
gray, /* Grayscale image? */
ncolors, /* Bits per pixel */
transparent; /* Transparent color index */
/*
* GIF files are either grayscale or RGB - no CMYK...
*/
if (primary == CUPS_IMAGE_RGB_CMYK)
primary = CUPS_IMAGE_RGB;
/*
* Read the header; we already know it is a GIF file...
*/
fread(buf, 13, 1, fp);
img->xsize = (buf[7] << 8) | buf[6];
img->ysize = (buf[9] << 8) | buf[8];
ncolors = 2 << (buf[10] & 0x07);
gray = primary == CUPS_IMAGE_BLACK || primary == CUPS_IMAGE_WHITE;
if (buf[10] & GIF_COLORMAP)
if (gif_read_cmap(fp, ncolors, cmap, &gray))
{
fclose(fp);
return (-1);
}
transparent = -1;
for (;;)
{
switch (getc(fp))
{
case ';' : /* End of image */
fclose(fp);
return (-1); /* Early end of file */
case '!' : /* Extension record */
buf[0] = getc(fp);
if (buf[0] == 0xf9) /* Graphic Control Extension */
{
gif_get_block(fp, buf);
if (buf[0] & 1) /* Get transparent color index */
transparent = buf[3];
}
while (gif_get_block(fp, buf) != 0);
break;
case ',' : /* cupsImage data */
fread(buf, 9, 1, fp);
if (buf[8] & GIF_COLORMAP)
{
ncolors = 2 << (buf[8] & 0x07);
gray = primary == CUPS_IMAGE_BLACK || primary == CUPS_IMAGE_WHITE;
if (gif_read_cmap(fp, ncolors, cmap, &gray))
{
fclose(fp);
return (-1);
}
}
if (transparent >= 0)
{
/*
* Make transparent color white...
*/
cmap[transparent][0] = 255;
cmap[transparent][1] = 255;
cmap[transparent][2] = 255;
}
if (gray)
{
switch (secondary)
{
case CUPS_IMAGE_CMYK :
for (i = ncolors - 1; i >= 0; i --)
cupsImageWhiteToCMYK(cmap[i], cmap[i], 1);
break;
case CUPS_IMAGE_CMY :
for (i = ncolors - 1; i >= 0; i --)
cupsImageWhiteToCMY(cmap[i], cmap[i], 1);
break;
case CUPS_IMAGE_BLACK :
for (i = ncolors - 1; i >= 0; i --)
cupsImageWhiteToBlack(cmap[i], cmap[i], 1);
break;
case CUPS_IMAGE_WHITE :
break;
case CUPS_IMAGE_RGB :
case CUPS_IMAGE_RGB_CMYK :
for (i = ncolors - 1; i >= 0; i --)
cupsImageWhiteToRGB(cmap[i], cmap[i], 1);
break;
}
img->colorspace = secondary;
}
else
{
if (hue != 0 || saturation != 100)
for (i = ncolors - 1; i >= 0; i --)
cupsImageRGBAdjust(cmap[i], 1, saturation, hue);
switch (primary)
{
case CUPS_IMAGE_CMYK :
for (i = ncolors - 1; i >= 0; i --)
cupsImageRGBToCMYK(cmap[i], cmap[i], 1);
break;
case CUPS_IMAGE_CMY :
for (i = ncolors - 1; i >= 0; i --)
cupsImageRGBToCMY(cmap[i], cmap[i], 1);
break;
case CUPS_IMAGE_BLACK :
for (i = ncolors - 1; i >= 0; i --)
cupsImageRGBToBlack(cmap[i], cmap[i], 1);
break;
case CUPS_IMAGE_WHITE :
for (i = ncolors - 1; i >= 0; i --)
cupsImageRGBToWhite(cmap[i], cmap[i], 1);
break;
case CUPS_IMAGE_RGB :
case CUPS_IMAGE_RGB_CMYK :
for (i = ncolors - 1; i >= 0; i --)
cupsImageRGBToRGB(cmap[i], cmap[i], 1);
break;
}
img->colorspace = primary;
}
if (lut)
{
bpp = cupsImageGetDepth(img);
for (i = ncolors - 1; i >= 0; i --)
cupsImageLut(cmap[i], bpp, lut);
}
img->xsize = (buf[5] << 8) | buf[4];
img->ysize = (buf[7] << 8) | buf[6];
/*
* Check the dimensions of the image; since the dimensions are
* a 16-bit integer we just need to check for 0...
*/
if (img->xsize == 0 || img->ysize == 0)
{
fprintf(stderr, "DEBUG: Bad GIF image dimensions: %dx%d\n",
img->xsize, img->ysize);
fclose(fp);
return (1);
}
i = gif_read_image(fp, img, cmap, buf[8] & GIF_INTERLACE);
fclose(fp);
return (i);
}
}
}
