/*
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
% %
% %
% %
% X X CCCC FFFFF %
% X X C F %
% X C FFF %
% X X C F %
% X X CCCC F %
% %
% %
% Read GIMP XCF Image Format. %
% %
% Software Design %
% Leonard Rosenthol %
% November 2001 %
% %
% %
% Copyright 1999-2007 ImageMagick Studio LLC, a non-profit organization %
% dedicated to making software imaging solutions freely available. %
% %
% You may not use this file except in compliance with the License. You may %
% obtain a copy of the License at %
% %
% http://www.imagemagick.org/script/license.php %
% %
% Unless required by applicable law or agreed to in writing, software %
% distributed under the License is distributed on an "AS IS" BASIS, %
% WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. %
% See the License for the specific language governing permissions and %
% limitations under the License. %
% %
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%
%
*/
/*
Include declarations.
*/
#include "magick/studio.h"
#include "magick/blob.h"
#include "magick/blob-private.h"
#include "magick/color.h"
#include "magick/composite.h"
#include "magick/exception.h"
#include "magick/exception-private.h"
#include "magick/image.h"
#include "magick/image-private.h"
#include "magick/list.h"
#include "magick/magick.h"
#include "magick/memory_.h"
#include "magick/quantize.h"
#include "magick/quantum-private.h"
#include "magick/static.h"
#include "magick/string_.h"
#include "magick/module.h"
/*
Typedef declarations.
*/
typedef enum
{
GIMP_RGB,
GIMP_GRAY,
GIMP_INDEXED
} GimpImageBaseType;
typedef enum
{
PROP_END = 0,
PROP_COLORMAP = 1,
PROP_ACTIVE_LAYER = 2,
PROP_ACTIVE_CHANNEL = 3,
PROP_SELECTION = 4,
PROP_FLOATING_SELECTION = 5,
PROP_OPACITY = 6,
PROP_MODE = 7,
PROP_VISIBLE = 8,
PROP_LINKED = 9,
PROP_PRESERVE_TRANSPARENCY = 10,
PROP_APPLY_MASK = 11,
PROP_EDIT_MASK = 12,
PROP_SHOW_MASK = 13,
PROP_SHOW_MASKED = 14,
PROP_OFFSETS = 15,
PROP_COLOR = 16,
PROP_COMPRESSION = 17,
PROP_GUIDES = 18,
PROP_RESOLUTION = 19,
PROP_TATTOO = 20,
PROP_PARASITES = 21,
PROP_UNIT = 22,
PROP_PATHS = 23,
PROP_USER_UNIT = 24
} PropType;
typedef enum
{
COMPRESS_NONE = 0,
COMPRESS_RLE = 1,
COMPRESS_ZLIB = 2, /* unused */
COMPRESS_FRACTAL = 3 /* unused */
} XcfCompressionType;
typedef struct {
unsigned long
width,
height,
image_type,
bpp; /* BYTES per pixel!! */
int
compression;
/* not really part of the doc, but makes it easy to pass around! */
ExceptionInfo
*exception;
} XCFDocInfo;
typedef struct {
char name[1024];
unsigned int active;
unsigned long width,
height,
type,
opacity,
visible,
linked,
preserve_trans,
apply_mask,
show_mask,
edit_mask,
floating_offset;
long offset_x,
offset_y;
unsigned long mode,
tattoo;
Image* image;
} XCFLayerInfo;
#define TILE_WIDTH 64
#define TILE_HEIGHT 64
typedef struct {
unsigned char
red,
green,
blue,
opacity; /* NOTE: reversed from IM! */
} XCFPixelPacket;
/*
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
% %
% %
% %
% I s X C F %
% %
% %
% %
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%
% IsXCF() returns MagickTrue if the image format type, identified by the
% magick string, is XCF (GIMP native format).
%
% The format of the IsXCF method is:
%
% MagickBooleanType IsXCF(const unsigned char *magick,const size_t length)
%
% A description of each parameter follows:
%
% o magick: This string is generally the first few bytes of an image file
% or blob.
%
% o length: Specifies the length of the magick string.
%
%
*/
static MagickBooleanType IsXCF(const unsigned char *magick,const size_t length)
{
if (length < 8)
return(MagickFalse);
if (LocaleNCompare((char *) magick,"gimp xcf",8) == 0)
return(MagickTrue);
return(MagickFalse);
}
typedef enum
{
GIMP_NORMAL_MODE,
GIMP_DISSOLVE_MODE,
GIMP_BEHIND_MODE,
GIMP_MULTIPLY_MODE,
GIMP_SCREEN_MODE,
GIMP_OVERLAY_MODE,
GIMP_DIFFERENCE_MODE,
GIMP_ADDITION_MODE,
GIMP_SUBTRACT_MODE,
GIMP_DARKEN_ONLY_MODE,
GIMP_LIGHTEN_ONLY_MODE,
GIMP_HUE_MODE,
GIMP_SATURATION_MODE,
GIMP_COLOR_MODE,
GIMP_VALUE_MODE,
GIMP_DIVIDE_MODE,
GIMP_DODGE_MODE,
GIMP_BURN_MODE,
GIMP_HARDLIGHT_MODE
} GimpLayerModeEffects;
/*
Simple utility routine to convert between PSD blending modes and
ImageMagick compositing operators
*/
static CompositeOperator GIMPBlendModeToCompositeOperator( unsigned long blendMode )
{
switch ( blendMode ) {
case GIMP_NORMAL_MODE: return( OverCompositeOp );
case GIMP_DISSOLVE_MODE: return( DissolveCompositeOp );
case GIMP_MULTIPLY_MODE: return( MultiplyCompositeOp );
case GIMP_SCREEN_MODE: return( ScreenCompositeOp );
case GIMP_OVERLAY_MODE: return( OverlayCompositeOp );
case GIMP_DIFFERENCE_MODE: return( DifferenceCompositeOp );
case GIMP_ADDITION_MODE: return( AddCompositeOp );
case GIMP_SUBTRACT_MODE: return( SubtractCompositeOp );
case GIMP_DARKEN_ONLY_MODE: return( DarkenCompositeOp );
case GIMP_LIGHTEN_ONLY_MODE:return( LightenCompositeOp );
case GIMP_HUE_MODE: return( HueCompositeOp );
case GIMP_SATURATION_MODE: return( SaturateCompositeOp );
case GIMP_COLOR_MODE: return( ColorizeCompositeOp );
/* these are the ones we don't support...yet */
case GIMP_DODGE_MODE: return( OverCompositeOp );
case GIMP_BURN_MODE: return( OverCompositeOp );
case GIMP_HARDLIGHT_MODE: return( OverCompositeOp );
case GIMP_BEHIND_MODE: return( OverCompositeOp );
case GIMP_VALUE_MODE: return( OverCompositeOp );
case GIMP_DIVIDE_MODE: return( OverCompositeOp );
default:
return( OverCompositeOp );
}
}
/*
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
% %
% %
% %
+ R e a d B l o b S t r i n g W i t h L o n g S i z e %
% %
% %
% %
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%
% ReadBlobStringWithLongSize reads characters from a blob or file
% starting with a long length byte and then characters to that length
%
% The format of the ReadBlobStringWithLongSize method is:
%
% char *ReadBlobStringWithLongSize(Image *image,char *string)
%
% A description of each parameter follows:
%
% o image: The image.
%
% o string: The address of a character buffer.
%
*/
static inline size_t MagickMin(const size_t x,const size_t y)
{
if (x < y)
return(x);
return(y);
}
static char *ReadBlobStringWithLongSize(Image *image,char *string,size_t max)
{
int
c;
MagickOffsetType
offset;
register long
i;
unsigned long
length;
assert(image != (Image *) NULL);
assert(image->signature == MagickSignature);
assert(max != 0);
if (image->debug != MagickFalse)
(void) LogMagickEvent(TraceEvent,GetMagickModule(),"%s",image->filename);
length=ReadBlobMSBLong(image);
for (i=0; i < (long) MagickMin(length,max-1); i++)
{
c=ReadBlobByte(image);
if (c == EOF)
return((char *) NULL);
string[i]=(char) c;
}
string[i]='\0';
offset=SeekBlob(image,(MagickOffsetType) (length-i),SEEK_CUR);
if (offset < 0)
(void) ThrowMagickException(&image->exception,GetMagickModule(),
CorruptImageError,"ImproperImageHeader","`%s'",image->filename);
return(string);
}
static int load_tile (Image* image, Image* tile_image, XCFDocInfo* inDocInfo,
XCFLayerInfo* inLayerInfo, size_t data_length)
{
long i;
ssize_t nmemb_read_successfully;
PixelPacket* q;
XCFPixelPacket *xcfdata, *xcfodata;
unsigned char *graydata;
xcfdata = xcfodata = (XCFPixelPacket *) AcquireQuantumMemory(data_length,
sizeof(*xcfdata));
graydata = (unsigned char *)xcfdata; /* used by gray and indexed */
nmemb_read_successfully = ReadBlob(image, data_length, (unsigned char *) xcfdata);
if (nmemb_read_successfully > (ssize_t) (tile_image->columns*tile_image->rows))
ThrowBinaryException(CorruptImageError,"NotEnoughPixelData",image->filename);
q=SetImagePixels(tile_image,0,0,tile_image->columns,tile_image->rows);
/* we have to copy the pixels individually since IM uses a different
format PixelPacket on different platforms - not to mention
different QuantumDepths!
*/
for ( i=0; i < (long) nmemb_read_successfully;i++ ) {
if ( inDocInfo->image_type == GIMP_GRAY ) {
q->red = ScaleCharToQuantum(*graydata);
q->green = ScaleCharToQuantum(*graydata);
q->blue = ScaleCharToQuantum(*graydata);
q->opacity = ScaleCharToQuantum((unsigned char) (255-inLayerInfo->opacity));
graydata++;
} else if ( inDocInfo->image_type == GIMP_RGB ) {
q->red = ScaleCharToQuantum(xcfdata->red);
q->green = ScaleCharToQuantum(xcfdata->green);
q->blue = ScaleCharToQuantum(xcfdata->blue);
q->opacity = (Quantum) ((int) xcfdata->opacity==0 ? TransparentOpacity : ScaleCharToQuantum((unsigned char) (255-inLayerInfo->opacity)));
xcfdata++;
};
q++;
}
xcfodata=(XCFPixelPacket *) RelinquishMagickMemory(xcfodata);
return MagickTrue;
}
static int load_tile_rle (Image* image, Image* tile_image, XCFDocInfo* inDocInfo,
XCFLayerInfo* inLayerInfo, int data_length)
{
unsigned char data, val;
MagickOffsetType size;
size_t length;
int bpp; /* BYTES per pixel! */
long i, j;
ssize_t nmemb_read_successfully;
unsigned char *xcfdata, *xcfodata, *xcfdatalimit;
PixelPacket* q;
bpp = (int) inDocInfo->bpp;
xcfdata = xcfodata = (unsigned char *) AcquireQuantumMemory((size_t)
data_length,sizeof(*xcfdata));
nmemb_read_successfully = ReadBlob(image, (size_t) data_length, xcfdata);
xcfdatalimit = xcfodata+nmemb_read_successfully-1;
for (i=0; i < bpp; i++)
{
q=GetImagePixels(tile_image,0,0,tile_image->columns,tile_image->rows);
size=(MagickOffsetType) tile_image->rows*tile_image->columns;
while (size > 0)
{
if (xcfdata > xcfdatalimit)
{
goto bogus_rle;
}
val=(*xcfdata++);
length=(size_t) val;
if (length >= 128)
{
length = 255 - (length - 1);
if (length == 128)
{
if (xcfdata >= xcfdatalimit)
{
goto bogus_rle;
}
length = (size_t) ((*xcfdata << 8) + xcfdata[1]);
xcfdata += 2;
}
size -= length;
if (size < 0)
{
goto bogus_rle;
}
if (&xcfdata[length-1] > xcfdatalimit)
{
goto bogus_rle;
}
while (length-- > 0)
{
data = *xcfdata++;
switch (i) {
case 0:
q->red=ScaleCharToQuantum(data);
q->green=q->red;
q->blue=q->red;
q->opacity=ScaleCharToQuantum((unsigned char) (255-inLayerInfo->opacity));
break;
case 1: q->green=ScaleCharToQuantum(data); break;
case 2: q->blue=ScaleCharToQuantum(data); break;
case 3:
q->opacity=(Quantum) (ScaleCharToQuantum((unsigned char) (255UL-data)));
break;
}
q++;
}
}
else
{
length += 1;
if (length == 128)
{
if (xcfdata >= xcfdatalimit)
{
goto bogus_rle;
}
length = (size_t) ((*xcfdata << 8) + xcfdata[1]);
xcfdata += 2;
}
size -= length;
if (size < 0)
{
goto bogus_rle;
}
if (xcfdata > xcfdatalimit)
{
goto bogus_rle;
}
val = *xcfdata++;
for (j = 0; j < (long) length; j++)
{
data = val;
switch (i)
{
case 0:
q->red=ScaleCharToQuantum(data);
q->green=q->red;
q->blue=q->red;
q->opacity=ScaleCharToQuantum((unsigned char) (255-inLayerInfo->opacity));
break;
case 1: q->green=ScaleCharToQuantum(data); break;
case 2: q->blue=ScaleCharToQuantum(data); break;
case 3:
q->opacity=(Quantum) (ScaleCharToQuantum((unsigned char) (255-data)));
break;
}
q++;
}
}
}
(void) SyncImagePixels(tile_image);
}
xcfodata=(unsigned char *) RelinquishMagickMemory(xcfodata);
return MagickTrue;
bogus_rle:
if (xcfodata)
xcfodata=(unsigned char *) RelinquishMagickMemory(xcfodata);
return MagickFalse;
}
static int load_level (Image* image, XCFDocInfo* inDocInfo, XCFLayerInfo*
inLayerInfo)
{
MagickOffsetType
saved_pos,
offset,
offset2;
unsigned long
ntiles,
ntile_rows,
ntile_cols,
junk_width,
junk_height;
Image*
tile_image;
int
destLeft = 0,
destTop = 0;
long
i;
MagickBooleanType
fail;
unsigned long
tile_image_width,
tile_image_height;
ExceptionInfo
*exception = inDocInfo->exception;
/* start reading the data */
junk_width = ReadBlobMSBLong(image);
junk_height = ReadBlobMSBLong(image);
/* read in the first tile offset.
* if it is '0', then this tile level is empty
* and we can simply return.
*/
offset = (MagickOffsetType) ReadBlobMSBLong(image);
if (offset == 0)
return 1;
/* Initialise the reference for the in-memory tile-compression
*/
ntile_rows = (junk_height + TILE_HEIGHT - 1) / TILE_HEIGHT;
ntile_cols = (junk_width + TILE_WIDTH - 1) / TILE_WIDTH;
ntiles = ntile_rows * ntile_cols;
for (i = 0; i < (long) ntiles; i++)
{
fail = MagickFalse;
if (offset == 0)
ThrowBinaryException(CorruptImageError,"NotEnoughTiles",
image->filename);
/* save the current position as it is where the
* next tile offset is stored.
*/
saved_pos = TellBlob(image);
/* read in the offset of the next tile so we can calculate the amount
of data needed for this tile*/
offset2 = (MagickOffsetType) ReadBlobMSBLong(image);
/* if the offset is 0 then we need to read in the maximum possible
allowing for negative compression */
if (offset2 == 0)
offset2 = (MagickOffsetType) (offset + TILE_WIDTH * TILE_WIDTH * 4* 1.5);
/* 1.5 is probably more
than we need to allow */
/* seek to the tile offset */
offset=SeekBlob(image, offset, SEEK_SET);
/* allocate the image for the tile
NOTE: the last tile in a row or column may not be a full tile!
*/
tile_image_width=(unsigned long) (destLeft == (int) ntile_cols-1 ?
(int) junk_width % TILE_WIDTH : TILE_WIDTH);
if (tile_image_width == 0) tile_image_width=TILE_WIDTH;
tile_image_height = (unsigned long) (destTop == (int) ntile_rows-1 ?
(int) junk_height % TILE_HEIGHT : TILE_HEIGHT);
if (tile_image_height == 0) tile_image_height=TILE_HEIGHT;
tile_image=CloneImage(inLayerInfo->image,tile_image_width,
tile_image_height,MagickTrue,exception);
/* read in the tile */
switch (inDocInfo->compression)
{
case COMPRESS_NONE:
if (load_tile(image,tile_image,inDocInfo,inLayerInfo,(size_t) (offset2-offset)) == 0)
fail = MagickTrue;
break;
case COMPRESS_RLE:
if (load_tile_rle (image,tile_image,inDocInfo,inLayerInfo,
(int) (offset2-offset)) == 0)
fail = MagickTrue;
break;
case COMPRESS_ZLIB:
ThrowBinaryException(CoderError,"ZipCompressNotSupported",
image->filename)
case COMPRESS_FRACTAL:
ThrowBinaryException(CoderError,"FractalCompressNotSupported",
image->filename)
}
/* composite the tile onto the layer's image, and then destroy it */
(void) CompositeImage(inLayerInfo->image,CopyCompositeOp,tile_image,
destLeft * TILE_WIDTH,destTop*TILE_HEIGHT);
tile_image=DestroyImage(tile_image);
/* adjust tile position */
destLeft++;
if (destLeft >= (int) ntile_cols)
{
destLeft = 0;
destTop++;
}
if (fail != MagickFalse)
return MagickFalse;
/* restore the saved position so we'll be ready to
* read the next offset.
*/
offset=SeekBlob(image, saved_pos, SEEK_SET);
/* read in the offset of the next tile */
offset = (MagickOffsetType) ReadBlobMSBLong(image);
}
if (offset != 0)
ThrowBinaryException(CorruptImageError,"CorruptImage",image->filename)
return 1;
}
static int load_hierarchy (Image *image, XCFDocInfo* inDocInfo, XCFLayerInfo*
inLayer)
{
MagickOffsetType
saved_pos,
offset,
junk;
unsigned long
junk_width,
junk_height,
junk_bpp;
junk_width = ReadBlobMSBLong(image);
junk_height = ReadBlobMSBLong(image);
junk_bpp = inDocInfo->bpp = ReadBlobMSBLong(image);
/* load in the levels...we make sure that the number of levels
* calculated when the TileManager was created is the same
* as the number of levels found in the file.
*/
offset = (MagickOffsetType) ReadBlobMSBLong(image); /* top level */
/* discard offsets for layers below first, if any.
*/
do
{
junk = (MagickOffsetType) ReadBlobMSBLong(image);
}
while (junk != 0);
/* save the current position as it is where the
* next level offset is stored.
*/
saved_pos = TellBlob(image);
/* seek to the level offset */
offset=SeekBlob(image, offset, SEEK_SET);
/* read in the level */
if (load_level (image, inDocInfo, inLayer) == 0)
return 0;
/* restore the saved position so we'll be ready to
* read the next offset.
*/
offset=SeekBlob(image, saved_pos, SEEK_SET);
return 1;
}
static MagickBooleanType ReadOneLayer(Image* image,XCFDocInfo* inDocInfo,
XCFLayerInfo *outLayer )
{
long
i;
MagickOffsetType
offset;
unsigned int
foundPropEnd = 0;
unsigned long
hierarchy_offset,
layer_mask_offset;
/* clear the block! */
(void) ResetMagickMemory( outLayer, 0, sizeof( XCFLayerInfo ) );
/* read in the layer width, height, type and name */
outLayer->width = ReadBlobMSBLong(image);
outLayer->height = ReadBlobMSBLong(image);
outLayer->type = ReadBlobMSBLong(image);
(void) ReadBlobStringWithLongSize(image, outLayer->name,
sizeof(outLayer->name));
/* allocate the image for this layer */
outLayer->image=CloneImage(image,outLayer->width, outLayer->height,MagickTrue,
&image->exception);
if (outLayer->image == (Image *) NULL)
return MagickFalse;
/* read the layer properties! */
foundPropEnd = 0;
while ( (foundPropEnd == MagickFalse) && (EOFBlob(image) == MagickFalse) ) {
PropType prop_type = (PropType) ReadBlobMSBLong(image);
unsigned long prop_size = ReadBlobMSBLong(image);
switch (prop_type)
{
case PROP_END:
foundPropEnd = 1;
break;
case PROP_ACTIVE_LAYER:
outLayer->active = 1;
break;
case PROP_FLOATING_SELECTION:
outLayer->floating_offset = ReadBlobMSBLong(image);
break;
case PROP_OPACITY:
outLayer->opacity = ReadBlobMSBLong(image);
break;
case PROP_VISIBLE:
outLayer->visible = ReadBlobMSBLong(image);
break;
case PROP_LINKED:
outLayer->linked = ReadBlobMSBLong(image);
break;
case PROP_PRESERVE_TRANSPARENCY:
outLayer->preserve_trans = ReadBlobMSBLong(image);
break;
case PROP_APPLY_MASK:
outLayer->apply_mask = ReadBlobMSBLong(image);
break;
case PROP_EDIT_MASK:
outLayer->edit_mask = ReadBlobMSBLong(image);
break;
case PROP_SHOW_MASK:
outLayer->show_mask = ReadBlobMSBLong(image);
break;
case PROP_OFFSETS:
outLayer->offset_x = (long) ReadBlobMSBLong(image);
outLayer->offset_y = (long) ReadBlobMSBLong(image);
break;
case PROP_MODE:
outLayer->mode = ReadBlobMSBLong(image);
break;
case PROP_TATTOO:
outLayer->preserve_trans = ReadBlobMSBLong(image);
break;
case PROP_PARASITES:
{
for (i=0; i < (long) prop_size; i++ )
(void) ReadBlobByte(image);
/*
long base = info->cp;
GimpParasite *p;
while (info->cp - base < prop_size)
{
p = xcf_load_parasite(info);
gimp_drawable_parasite_attach(GIMP_DRAWABLE(layer), p);
gimp_parasite_free(p);
}
if (info->cp - base != prop_size)
g_message ("Error detected while loading a layer's parasites");
*/
}
break;
default:
/* g_message ("unexpected/unknown layer property: %d (skipping)",
prop_type); */
{
int buf[16];
ssize_t amount;
/* read over it... */
while ((prop_size > 0) && (EOFBlob(image) == MagickFalse))
{
amount = (ssize_t) MagickMin(16, prop_size);
amount = ReadBlob(image, (size_t) amount, (unsigned char *) &buf);
if (!amount)
ThrowBinaryException(CorruptImageError,"CorruptImage",
image->filename);
prop_size -= (unsigned long) MagickMin(16, (size_t) amount);
}
}
break;
}
}
if (foundPropEnd == MagickFalse)
return(MagickFalse);
/* clear the image based on the layer opacity */
outLayer->image->background_color.opacity=
ScaleCharToQuantum((unsigned char) (255-outLayer->opacity));
(void) SetImageBackgroundColor(outLayer->image);
/* set the compositing mode */
outLayer->image->compose = GIMPBlendModeToCompositeOperator( outLayer->mode );
if ( outLayer->visible == MagickFalse )
{
/* BOGUS: should really be separate member var! */
outLayer->image->compose = NoCompositeOp;
}
/* read the hierarchy and layer mask offsets */
hierarchy_offset = ReadBlobMSBLong(image);
layer_mask_offset = ReadBlobMSBLong(image);
/* read in the hierarchy */
offset=SeekBlob(image, (MagickOffsetType) hierarchy_offset, SEEK_SET);
if (offset < 0)
(void) ThrowMagickException(&image->exception,GetMagickModule(),
CorruptImageError,"InvalidImageHeader","`%s'",image->filename);
if (load_hierarchy (image, inDocInfo, outLayer) == 0)
return(MagickFalse);
/* read in the layer mask */
if (layer_mask_offset != 0)
{
offset=SeekBlob(image, (MagickOffsetType) layer_mask_offset, SEEK_SET);
#if 0 /* BOGUS: support layer masks! */
layer_mask = xcf_load_layer_mask (info, gimage);
if (layer_mask == 0)
goto error;
/* set the offsets of the layer_mask */
GIMP_DRAWABLE (layer_mask)->offset_x = GIMP_DRAWABLE (layer)->offset_x;
GIMP_DRAWABLE (layer_mask)->offset_y = GIMP_DRAWABLE (layer)->offset_y;
gimp_layer_add_mask (layer, layer_mask, MagickFalse);
layer->mask->apply_mask = apply_mask;
layer->mask->edit_mask = edit_mask;
layer->mask->show_mask = show_mask;
#endif
}
/* attach the floating selection... */
#if 0 /* BOGUS: we may need to read this, even if we don't support it! */
if (add_floating_sel)
{
GimpLayer *floating_sel;
floating_sel = info->floating_sel;
floating_sel_attach (floating_sel, GIMP_DRAWABLE (layer));
}
#endif
return MagickTrue;
}
/*
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
% %
% %
% %
% R e a d X C F I m a g e %
% %
% %
% %
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%
% ReadXCFImage() reads a GIMP (GNU Image Manipulation Program) image
% file and returns it. It allocates the memory necessary for the new Image
% structure and returns a pointer to the new image.
%
% The format of the ReadXCFImage method is:
%
% image=ReadXCFImage(image_info)
%
% A description of each parameter follows:
%
% o image_info: The image info.
%
% o exception: return any errors or warnings in this structure.
%
%
*/
static Image *ReadXCFImage(const ImageInfo *image_info,ExceptionInfo *exception)
{
char
magick[14];
Image
*image;
int
foundPropEnd = 0;
MagickBooleanType
status;
MagickOffsetType
offset;
register long
i;
size_t
length;
ssize_t
count;
unsigned long
image_type;
XCFDocInfo
doc_info;
/*
Open image file.
*/
assert(image_info != (const ImageInfo *) NULL);
assert(image_info->signature == MagickSignature);
if (image_info->debug != MagickFalse)
(void) LogMagickEvent(TraceEvent,GetMagickModule(),"%s",
image_info->filename);
assert(exception != (ExceptionInfo *) NULL);
assert(exception->signature == MagickSignature);
image=AllocateImage(image_info);
status=OpenBlob(image_info,image,ReadBinaryBlobMode,exception);
if (status == MagickFalse)
{
image=DestroyImageList(image);
return((Image *) NULL);
}
count=ReadBlob(image,14,(unsigned char *) magick);
if ((count == 0) ||
(LocaleNCompare((char *) magick,"gimp xcf",8) != 0))
ThrowReaderException(CorruptImageError,"ImproperImageHeader");
(void) ResetMagickMemory(&doc_info,0,sizeof(XCFDocInfo));
doc_info.exception=exception;
doc_info.width=ReadBlobMSBLong(image);
doc_info.height=ReadBlobMSBLong(image);
if ((doc_info.width > 262144) || (doc_info.height > 262144))
ThrowReaderException(CorruptImageError,"ImproperImageHeader");
doc_info.image_type=ReadBlobMSBLong(image);
/*
Initialize image attributes.
*/
image->columns=doc_info.width;
image->rows=doc_info.height;
image_type=doc_info.image_type;
image->compression=NoCompression;
image->depth=8;
if (image_type == GIMP_RGB)
image->colorspace=RGBColorspace;
else
if (image_type == GIMP_GRAY)
image->colorspace=GRAYColorspace;
else
if (image_type == GIMP_INDEXED)
ThrowReaderException(CoderError,"ColormapTypeNotSupported");
if (SetImageExtent(image,0,0) == MagickFalse)
{
InheritException(exception,&image->exception);
return(DestroyImageList(image));
}
(void) SetImageBackgroundColor(image);
/*
Read properties.
*/
while (foundPropEnd == MagickFalse)
{
PropType prop_type = (PropType) ReadBlobMSBLong(image);
unsigned long prop_size = ReadBlobMSBLong(image);
switch (prop_type)
{
case PROP_END:
foundPropEnd=1;
break;
case PROP_COLORMAP:
{
/* Cannot rely on prop_size here--the value is set incorrectly
by some Gimp versions.
*/
unsigned long num_colours = ReadBlobMSBLong(image);
for (i=0; i < (long) (3L*num_colours); i++ )
(void) ReadBlobByte(image);
/*
if (info->file_version == 0)
{
gint i;
g_message (_("XCF warning: version 0 of XCF file format\n"
"did not save indexed colormaps correctly.\n"
"Substituting grayscale map."));
info->cp +=
xcf_read_int32 (info->fp, (guint32*) &gimage->num_cols, 1);
gimage->cmap = g_new (guchar, gimage->num_cols*3);
xcf_seek_pos (info, info->cp + gimage->num_cols);
for (i = 0; i<gimage->num_cols; i++)
{
gimage->cmap[i*3+0] = i;
gimage->cmap[i*3+1] = i;
gimage->cmap[i*3+2] = i;
}
}
else
{
info->cp +=
xcf_read_int32 (info->fp, (guint32*) &gimage->num_cols, 1);
gimage->cmap = g_new (guchar, gimage->num_cols*3);
info->cp +=
xcf_read_int8 (info->fp,
(guint8*) gimage->cmap, gimage->num_cols*3);
}
*/
break;
}
case PROP_COMPRESSION:
{
doc_info.compression = ReadBlobByte(image);
if ((doc_info.compression != COMPRESS_NONE) &&
(doc_info.compression != COMPRESS_RLE) &&
(doc_info.compression != COMPRESS_ZLIB) &&
(doc_info.compression != COMPRESS_FRACTAL))
ThrowReaderException(CorruptImageError,"UnrecognizedImageCompression");
}
break;
case PROP_GUIDES:
{
/* just skip it - we don't care about guides */
for (i=0; i < (long) prop_size; i++ )
(void) ReadBlobByte(image);
}
break;
case PROP_RESOLUTION:
{
/* float xres = (float) */ (void) ReadBlobMSBLong(image);
/* float yres = (float) */ (void) ReadBlobMSBLong(image);
/*
if (xres < GIMP_MIN_RESOLUTION || xres > GIMP_MAX_RESOLUTION ||
yres < GIMP_MIN_RESOLUTION || yres > GIMP_MAX_RESOLUTION)
{
g_message ("Warning, resolution out of range in XCF file");
xres = gimage->gimp->config->default_xresolution;
yres = gimage->gimp->config->default_yresolution;
}
*/
/* BOGUS: we don't write these yet because we aren't
reading them properly yet :(
image->x_resolution = xres;
image->y_resolution = yres;
*/
}
break;
case PROP_TATTOO:
{
/* we need to read it, even if we ignore it */
/*unsigned long tattoo_state = */ (void) ReadBlobMSBLong(image);
}
break;
case PROP_PARASITES:
{
/* BOGUS: we may need these for IPTC stuff */
for (i=0; i < (long) prop_size; i++ )
(void) ReadBlobByte(image);
/*
glong base = info->cp;
GimpParasite *p;
while (info->cp - base < prop_size)
{
p = xcf_load_parasite (info);
gimp_image_parasite_attach (gimage, p);
gimp_parasite_free (p);
}
if (info->cp - base != prop_size)
g_message ("Error detected while loading an image's parasites");
*/
}
break;
case PROP_UNIT:
{
/* BOGUS: ignore for now... */
/*unsigned long unit = */ (void) ReadBlobMSBLong(image);
}
break;
case PROP_PATHS:
{
/* BOGUS: just skip it for now */
for (i=0; i< (long) prop_size; i++ )
(void) ReadBlobByte(image);
/*
PathList *paths = xcf_load_bzpaths (gimage, info);
gimp_image_set_paths (gimage, paths);
*/
}
break;
case PROP_USER_UNIT:
{
char unit_string[1000];
/*BOGUS: ignored for now */
/*float factor = (float) */ (void) ReadBlobMSBLong(image);
/* unsigned long digits = */ (void) ReadBlobMSBLong(image);
for (i=0; i<5; i++)
(void) ReadBlobStringWithLongSize(image, unit_string,
sizeof(unit_string));
}
break;
default:
{
int buf[16];
long amount;
/* read over it... */
while ((prop_size > 0) && (EOFBlob(image) == MagickFalse))
{
amount = (long) MagickMin(16, prop_size);
amount = (long) ReadBlob(image,(size_t) amount, (unsigned char *) &buf);
if (!amount)
ThrowReaderException(CorruptImageError,"CorruptImage");
prop_size -= (unsigned long) MagickMin(16, (size_t) amount);
}
}
break;
}
}
if (foundPropEnd == MagickFalse)
ThrowReaderException(CorruptImageError,"ImproperImageHeader");
if ((image_info->ping != MagickFalse) && (image_info->number_scenes != 0)) {
; /* do nothing, we were just pinging! */
} else {
XCFLayerInfo* layer_info;
int number_layers = 0,
current_layer = 0,
foundAllLayers = MagickFalse;
/* BIG HACK
because XCF doesn't include the layer count, and we
want to know it in advance in order to allocate memory,
we have to scan the layer offset list, and then reposition
the read pointer
*/
MagickOffsetType oldPos = TellBlob(image);
do {
long offset = (long) ReadBlobMSBLong(image);
if ( offset == 0 )
foundAllLayers = MagickTrue;
else
number_layers++;
if (EOFBlob(image) != MagickFalse)
{
ThrowFileException(exception,CorruptImageError,"UnexpectedEndOfFile",
image->filename);
break;
}
} while (foundAllLayers == MagickFalse);
offset=SeekBlob(image, oldPos, SEEK_SET); /* restore the position! */
if (offset < 0)
ThrowReaderException(CorruptImageError,"ImproperImageHeader");
/* allocate our array of layer info blocks */
length=(size_t) number_layers;
layer_info=(XCFLayerInfo *) AcquireQuantumMemory(length,
sizeof(*layer_info));
if (layer_info == (XCFLayerInfo *) NULL)
ThrowReaderException(ResourceLimitError,"MemoryAllocationFailed");
(void) ResetMagickMemory(layer_info,0,number_layers*sizeof(XCFLayerInfo));
for ( ; ; )
{
MagickOffsetType
offset,
saved_pos;
int
layer_ok;
/* read in the offset of the next layer */
offset = (MagickOffsetType) ReadBlobMSBLong(image);
/* if the offset is 0 then we are at the end
* of the layer list.
*/
if (offset == 0)
break;
/* save the current position as it is where the
* next layer offset is stored.
*/
saved_pos = TellBlob(image);
/* seek to the layer offset */
offset=SeekBlob(image, offset, SEEK_SET);
/* read in the layer */
layer_ok = ReadOneLayer( image, &doc_info, &layer_info[current_layer] );
if (layer_ok == MagickFalse) {
int j;
for (j=0; j < current_layer; j++)
layer_info[j].image=DestroyImage(layer_info[j].image);
ThrowReaderException(ResourceLimitError,"MemoryAllocationFailed");
}
/* restore the saved position so we'll be ready to
* read the next offset.
*/
offset=SeekBlob(image, saved_pos, SEEK_SET);
current_layer++;
}
if ( number_layers == 1 ) {
/* composite the layer data onto the main image & then dispose the layer */
(void) CompositeImage(image, OverCompositeOp, layer_info[0].image,
layer_info[0].offset_x, layer_info[0].offset_y );
layer_info[0].image =DestroyImage( layer_info[0].image );
/* Bob says that if we do this, we'll get REAL gray images! */
if ( image_type == GIMP_GRAY ) {
QuantizeInfo qi;
GetQuantizeInfo(&qi);
qi.dither=IsPaletteImage(image,&image->exception) == MagickFalse ?
MagickTrue : MagickFalse;
qi.colorspace = GRAYColorspace;
(void) QuantizeImage( &qi, image );
}
} else {
#if 0
{
/* NOTE: XCF layers are REVERSED from composite order! */
signed int j;
for (j=number_layers-1; j>=0; j--) {
/* BOGUS: need to consider layer blending modes!! */
if ( layer_info[j].visible ) { /* only visible ones, please! */
CompositeImage(image, OverCompositeOp, layer_info[j].image,
layer_info[j].offset_x, layer_info[j].offset_y );
layer_info[j].image =DestroyImage( layer_info[j].image );
/* Bob says that if we do this, we'll get REAL gray images! */
if ( image_type == GIMP_GRAY ) {
QuantizeInfo qi;
GetQuantizeInfo(&qi);
qi.colorspace = GRAYColorspace;
QuantizeImage( &qi, layer_info[j].image );
}
}
}
}
#else
{
/* NOTE: XCF layers are REVERSED from composite order! */
signed int j;
/* first we copy the last layer on top of the main image */
(void) CompositeImage(image, CopyCompositeOp, layer_info[number_layers-1].image,
layer_info[number_layers-1].offset_x,
layer_info[number_layers-1].offset_y );
layer_info[number_layers-1].image =DestroyImage( layer_info[number_layers-1].image );
/* Bob says that if we do this, we'll get REAL gray images! */
if ( image_type == GIMP_GRAY ) {
QuantizeInfo qi;
GetQuantizeInfo(&qi);
qi.colorspace = GRAYColorspace;
(void) QuantizeImage( &qi, image );
}
/* now reverse the order of the layers as they are put
into subimages
*/
j=number_layers-2;
image->next=layer_info[j].image;
layer_info[j].image->previous=image;
layer_info[j].image->page.x = layer_info[j].offset_x;
layer_info[j].image->page.y = layer_info[j].offset_y;
layer_info[j].image->page.width = layer_info[j].width;
layer_info[j].image->page.height = layer_info[j].height;
for (j=number_layers-3; j>=0; j--)
{
if (j > 0)
layer_info[j].image->next=layer_info[j-1].image;
if (j < (number_layers-1))
layer_info[j].image->previous=layer_info[j+1].image;
layer_info[j].image->page.x = layer_info[j].offset_x;
layer_info[j].image->page.y = layer_info[j].offset_y;
layer_info[j].image->page.width = layer_info[j].width;
layer_info[j].image->page.height = layer_info[j].height;
/* Bob says that if we do this, we'll get REAL gray images! */
if ( image_type == GIMP_GRAY ) {
QuantizeInfo qi;
GetQuantizeInfo(&qi);
qi.colorspace = GRAYColorspace;
(void) QuantizeImage( &qi, layer_info[j].image );
}
}
}
#endif
}
layer_info=(XCFLayerInfo *) RelinquishMagickMemory(layer_info);
#if 0 /* BOGUS: do we need the channels?? */
while (MagickTrue)
{
/* read in the offset of the next channel */
info->cp += xcf_read_int32 (info->fp, &offset, 1);
/* if the offset is 0 then we are at the end
* of the channel list.
*/
if (offset == 0)
break;
/* save the current position as it is where the
* next channel offset is stored.
*/
saved_pos = info->cp;
/* seek to the channel offset */
xcf_seek_pos (info, offset);
/* read in the layer */
channel = xcf_load_channel (info, gimage);
if (channel == 0)
goto error;
num_successful_elements++;
/* add the channel to the image if its not the selection */
if (channel != gimage->selection_mask)
gimp_image_add_channel (gimage, channel, -1);
/* restore the saved position so we'll be ready to
* read the next offset.
*/
xcf_seek_pos (info, saved_pos);
}
#endif
}
CloseBlob(image);
return(GetFirstImageInList(image));
}
/*
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
% %
% %
% %
% R e g i s t e r X C F I m a g e %
% %
% %
% %
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%
% RegisterXCFImage() adds attributes for the XCF image format to
% the list of supported formats. The attributes include the image format
% tag, a method to read and/or write the format, whether the format
% supports the saving of more than one frame to the same file or blob,
% whether the format supports native in-memory I/O, and a brief
% description of the format.
%
% The format of the RegisterXCFImage method is:
%
% unsigned long RegisterXCFImage(void)
%
*/
ModuleExport unsigned long RegisterXCFImage(void)
{
MagickInfo
*entry;
entry=SetMagickInfo("XCF");
entry->decoder=(DecodeImageHandler *) ReadXCFImage;
entry->magick=(IsImageFormatHandler *) IsXCF;
entry->description=ConstantString("GIMP image");
entry->module=ConstantString("XCF");
entry->seekable_stream=MagickTrue;
(void) RegisterMagickInfo(entry);
return(MagickImageCoderSignature);
}
/*
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
% %
% %
% %
% U n r e g i s t e r X C F I m a g e %
% %
% %
% %
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%
% UnregisterXCFImage() removes format registrations made by the
% XCF module from the list of supported formats.
%
% The format of the UnregisterXCFImage method is:
%
% UnregisterXCFImage(void)
%
*/
ModuleExport void UnregisterXCFImage(void)
{
(void) UnregisterMagickInfo("XCF");
}
|
