int
image_gif_load(image *im)
{
int x, y, ofs;
GifRecordType RecordType;
GifPixelType *line = NULL;
int ExtFunction = 0;
GifByteType *ExtData;
SavedImage *sp;
SavedImage temp_save;
int BackGround = 0;
int trans_index = 0; // transparent index if any
ColorMapObject *ColorMap;
GifColorType *ColorMapEntry;
temp_save.ExtensionBlocks = NULL;
temp_save.ExtensionBlockCount = 0;
// If reusing the object a second time, start over
if (im->used) {
DEBUG_TRACE("Recreating giflib objects\n");
image_gif_finish(im);
if (im->fh != NULL) {
// reset file to begining of image
PerlIO_seek(im->fh, im->image_offset, SEEK_SET);
}
else {
// reset SV read
im->sv_offset = im->image_offset;
}
buffer_clear(im->buf);
image_gif_read_header(im);
}
do {
if (DGifGetRecordType(im->gif, &RecordType) == GIF_ERROR) {
warn("Image::Scale unable to read GIF file (%s)\n", SvPVX(im->path));
image_gif_finish(im);
return 0;
}
switch (RecordType) {
case IMAGE_DESC_RECORD_TYPE:
if (DGifGetImageDesc(im->gif) == GIF_ERROR) {
warn("Image::Scale unable to read GIF file (%s)\n", SvPVX(im->path));
image_gif_finish(im);
return 0;
}
sp = &im->gif->SavedImages[im->gif->ImageCount - 1];
im->width = sp->ImageDesc.Width;
im->height = sp->ImageDesc.Height;
BackGround = im->gif->SBackGroundColor; // XXX needed?
ColorMap = im->gif->Image.ColorMap ? im->gif->Image.ColorMap : im->gif->SColorMap;
if (ColorMap == NULL) {
warn("Image::Scale GIF image has no colormap (%s)\n", SvPVX(im->path));
image_gif_finish(im);
return 0;
}
// Allocate storage for decompressed image
image_alloc(im, im->width, im->height);
New(0, line, im->width, GifPixelType);
if (im->gif->Image.Interlace) {
int i;
for (i = 0; i < 4; i++) {
for (x = InterlacedOffset[i]; x < im->height; x += InterlacedJumps[i]) {
ofs = x * im->width;
if (DGifGetLine(im->gif, line, 0) != GIF_OK) {
warn("Image::Scale unable to read GIF file (%s)\n", SvPVX(im->path));
image_gif_finish(im);
return 0;
}
for (y = 0; y < im->width; y++) {
ColorMapEntry = &ColorMap->Colors[line[y]];
im->pixbuf[ofs++] = COL_FULL(
ColorMapEntry->Red,
ColorMapEntry->Green,
ColorMapEntry->Blue,
trans_index == line[y] ? 0 : 255
);
}
}
}
}
else {
ofs = 0;
for (x = 0; x < im->height; x++) {
if (DGifGetLine(im->gif, line, 0) != GIF_OK) {
warn("Image::Scale unable to read GIF file (%s)\n", SvPVX(im->path));
image_gif_finish(im);
return 0;
}
for (y = 0; y < im->width; y++) {
ColorMapEntry = &ColorMap->Colors[line[y]];
im->pixbuf[ofs++] = COL_FULL(
ColorMapEntry->Red,
ColorMapEntry->Green,
ColorMapEntry->Blue,
trans_index == line[y] ? 0 : 255
);
}
}
}
Safefree(line);
break;
case EXTENSION_RECORD_TYPE:
if (DGifGetExtension(im->gif, &ExtFunction, &ExtData) == GIF_ERROR) {
warn("Image::Scale unable to read GIF file (%s)\n", SvPVX(im->path));
image_gif_finish(im);
return 0;
}
if (ExtFunction == 0xF9) { // transparency info
if (ExtData[1] & 1)
trans_index = ExtData[4];
else
trans_index = -1;
im->has_alpha = 1;
DEBUG_TRACE("GIF transparency index: %d\n", trans_index);
}
while (ExtData != NULL) {
/* Create an extension block with our data */
#ifdef GIFLIB_API_50
if (GifAddExtensionBlock(&im->gif->ExtensionBlockCount, &im->gif->ExtensionBlocks, ExtFunction, ExtData[0], &ExtData[1]) == GIF_ERROR) {
#else
temp_save.Function = ExtFunction;
if (AddExtensionBlock(&temp_save, ExtData[0], &ExtData[1]) == GIF_ERROR) {
#endif
#ifdef GIFLIB_API_41
PrintGifError();
#endif
warn("Image::Scale unable to read GIF file (%s)\n", SvPVX(im->path));
image_gif_finish(im);
return 0;
}
if (DGifGetExtensionNext(im->gif, &ExtData) == GIF_ERROR) {
#ifdef GIFLIB_API_41
PrintGifError();
#endif
warn("Image::Scale unable to read GIF file (%s)\n", SvPVX(im->path));
image_gif_finish(im);
return 0;
}
ExtFunction = 0; // CONTINUE_EXT_FUNC_CODE
}
break;
case TERMINATE_RECORD_TYPE:
default:
break;
}
} while (RecordType != TERMINATE_RECORD_TYPE);
return 1;
}
void
image_gif_finish(image *im)
{
if (im->gif != NULL) {
#ifdef GIFLIB_API_51
if (DGifCloseFile(im->gif, NULL) != GIF_OK) {
#else
if (DGifCloseFile(im->gif) != GIF_OK) {
#endif
#ifdef GIFLIB_API_41
PrintGifError();
#endif
warn("Image::Scale unable to close GIF file (%s)\n", SvPVX(im->path));
}
im->gif = NULL;
DEBUG_TRACE("image_gif_finish\n");
}
}
int
image_init(HV *self, image *im)
{
unsigned char *bptr;
char *file = NULL;
int ret = 1;
if (my_hv_exists(self, "file")) {
// Input from file
SV *path = *(my_hv_fetch(self, "file"));
file = SvPVX(path);
im->fh = IoIFP(sv_2io(*(my_hv_fetch(self, "_fh"))));
im->path = newSVsv(path);
}
else {
// Input from scalar ref
im->fh = NULL;
im->path = newSVpv("(data)", 0);
im->sv_data = *(my_hv_fetch(self, "data"));
if (SvROK(im->sv_data))
im->sv_data = SvRV(im->sv_data);
else
croak("data is not a scalar ref\n");
}
im->pixbuf = NULL;
im->outbuf = NULL;
im->outbuf_size = 0;
im->type = UNKNOWN;
im->sv_offset = 0;
im->image_offset = 0;
im->image_length = 0;
im->width = 0;
im->height = 0;
im->width_padding = 0;
im->width_inner = 0;
im->height_padding = 0;
im->height_inner = 0;
im->flipped = 0;
im->bpp = 0;
im->channels = 0;
im->has_alpha = 0;
im->orientation = ORIENTATION_NORMAL;
im->orientation_orig = ORIENTATION_NORMAL;
im->memory_limit = 0;
im->target_width = 0;
im->target_height = 0;
im->keep_aspect = 0;
im->resize_type = IMAGE_SCALE_TYPE_GD_FIXED;
im->filter = 0;
im->bgcolor = 0;
im->used = 0;
im->palette = NULL;
#ifdef HAVE_JPEG
im->cinfo = NULL;
#endif
#ifdef HAVE_PNG
im->png_ptr = NULL;
im->info_ptr = NULL;
#endif
#ifdef HAVE_GIF
im->gif = NULL;
#endif
// Read new() options
if (my_hv_exists(self, "offset")) {
im->image_offset = SvIV(*(my_hv_fetch(self, "offset")));
if (im->fh != NULL)
PerlIO_seek(im->fh, im->image_offset, SEEK_SET);
}
if (my_hv_exists(self, "length"))
im->image_length = SvIV(*(my_hv_fetch(self, "length")));
Newz(0, im->buf, sizeof(Buffer), Buffer);
buffer_init(im->buf, BUFFER_SIZE);
im->memory_used = BUFFER_SIZE;
// Determine type of file from magic bytes
if (im->fh != NULL) {
if ( !_check_buf(im->fh, im->buf, 8, BUFFER_SIZE) ) {
image_finish(im);
croak("Unable to read image header for %s\n", file);
}
}
else {
im->sv_offset = MIN(sv_len(im->sv_data) - im->image_offset, BUFFER_SIZE);
buffer_append(im->buf, SvPVX(im->sv_data) + im->image_offset, im->sv_offset);
}
bptr = buffer_ptr(im->buf);
switch (bptr[0]) {
case 0xff:
if (bptr[1] == 0xd8 && bptr[2] == 0xff) {
#ifdef HAVE_JPEG
im->type = JPEG;
#else
image_finish(im);
croak("Image::Scale was not built with JPEG support\n");
#endif
}
break;
case 0x89:
if (bptr[1] == 'P' && bptr[2] == 'N' && bptr[3] == 'G'
&& bptr[4] == 0x0d && bptr[5] == 0x0a && bptr[6] == 0x1a && bptr[7] == 0x0a) {
#ifdef HAVE_PNG
im->type = PNG;
#else
image_finish(im);
croak("Image::Scale was not built with PNG support\n");
#endif
}
break;
case 'G':
if (bptr[1] == 'I' && bptr[2] == 'F' && bptr[3] == '8'
&& (bptr[4] == '7' || bptr[4] == '9') && bptr[5] == 'a') {
#ifdef HAVE_GIF
im->type = GIF;
#else
image_finish(im);
croak("Image::Scale was not built with GIF support\n");
#endif
}
break;
case 'B':
if (bptr[1] == 'M') {
im->type = BMP;
}
break;
}
DEBUG_TRACE("Image type: %d\n", im->type);
// Read image header via type-specific function to determine dimensions
switch (im->type) {
#ifdef HAVE_JPEG
case JPEG:
if ( !image_jpeg_read_header(im) ) {
ret = 0;
goto out;
}
break;
#endif
#ifdef HAVE_PNG
case PNG:
if ( !image_png_read_header(im) ) {
ret = 0;
goto out;
}
break;
#endif
#ifdef HAVE_GIF
case GIF:
if ( !image_gif_read_header(im) ) {
ret = 0;
goto out;
}
break;
#endif
case BMP:
image_bmp_read_header(im);
break;
case UNKNOWN:
warn("Image::Scale unknown file type (%s), first 8 bytes were: %02x %02x %02x %02x %02x %02x %02x %02x\n",
SvPVX(im->path), bptr[0], bptr[1], bptr[2], bptr[3], bptr[4], bptr[5], bptr[6], bptr[7]);
ret = 0;
break;
}
DEBUG_TRACE("Image dimenensions: %d x %d, channels %d\n", im->width, im->height, im->channels);
out:
if (ret == 0)
image_finish(im);
return ret;
}
