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IMG_xcf.c
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/*
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SDL_image: An example image loading library for use with SDL
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Copyright (C) 1997-2009 Sam Lantinga
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This library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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This library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
License along with this library; if not, write to the Free Software
Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
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Sam Lantinga
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slouken@libsdl.org
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*/
/* This is a XCF image file loading framework */
#include <stdio.h>
#include <ctype.h>
#include <string.h>
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#include <stdlib.h>
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#include "SDL_endian.h"
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#include "SDL_image.h"
#ifdef LOAD_XCF
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#if DEBUG
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static char prop_names [][30] = {
"end",
"colormap",
"active_layer",
"active_channel",
"selection",
"floating_selection",
"opacity",
"mode",
"visible",
"linked",
"preserve_transparency",
"apply_mask",
"edit_mask",
"show_mask",
"show_masked",
"offsets",
"color",
"compression",
"guides",
"resolution",
"tattoo",
"parasites",
"unit",
"paths",
"user_unit"
};
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#endif
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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
} xcf_prop_type;
typedef enum {
COMPR_NONE = 0,
COMPR_RLE = 1,
COMPR_ZLIB = 2,
COMPR_FRACTAL = 3
} xcf_compr_type;
typedef enum {
IMAGE_RGB = 0,
IMAGE_GREYSCALE = 1,
IMAGE_INDEXED = 2
} xcf_image_type;
typedef struct {
Uint32 id;
Uint32 length;
union {
struct {
Uint32 num;
char * cmap;
} colormap; // 1
struct {
Uint32 drawable_offset;
} floating_selection; // 5
Sint32 opacity;
Sint32 mode;
int visible;
int linked;
int preserve_transparency;
int apply_mask;
int show_mask;
struct {
Sint32 x;
Sint32 y;
} offset;
unsigned char color [3];
Uint8 compression;
struct {
Sint32 x;
Sint32 y;
} resolution;
struct {
char * name;
Uint32 flags;
Uint32 size;
char * data;
} parasite;
} data;
} xcf_prop;
typedef struct {
char sign [14];
Uint32 width;
Uint32 height;
Sint32 image_type;
xcf_prop * properties;
Uint32 * layer_file_offsets;
Uint32 * channel_file_offsets;
xcf_compr_type compr;
Uint32 cm_num;
unsigned char * cm_map;
} xcf_header;
typedef struct {
Uint32 width;
Uint32 height;
Sint32 layer_type;
char * name;
xcf_prop * properties;
Uint32 hierarchy_file_offset;
Uint32 layer_mask_offset;
Uint32 offset_x;
Uint32 offset_y;
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int visible;
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} xcf_layer;
typedef struct {
Uint32 width;
Uint32 height;
char * name;
xcf_prop * properties;
Uint32 hierarchy_file_offset;
Uint32 color;
Uint32 opacity;
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int selection;
int visible;
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} xcf_channel;
typedef struct {
Uint32 width;
Uint32 height;
Uint32 bpp;
Uint32 * level_file_offsets;
} xcf_hierarchy;
typedef struct {
Uint32 width;
Uint32 height;
Uint32 * tile_file_offsets;
} xcf_level;
typedef unsigned char * xcf_tile;
typedef unsigned char * (* load_tile_type) (SDL_RWops *, Uint32, int, int, int);
/* See if an image is contained in a data source */
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int IMG_isXCF(SDL_RWops *src)
{
int start;
int is_XCF;
char magic[14];
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if ( !src )
return 0;
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start = SDL_RWtell(src);
is_XCF = 0;
if ( SDL_RWread(src, magic, sizeof(magic), 1) ) {
if (strncmp(magic, "gimp xcf ", 9) == 0) {
is_XCF = 1;
}
}
SDL_RWseek(src, start, SEEK_SET);
return(is_XCF);
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}
static char * read_string (SDL_RWops * src) {
Uint32 tmp;
char * data;
tmp = SDL_ReadBE32 (src);
if (tmp > 0) {
data = (char *) malloc (sizeof (char) * tmp);
SDL_RWread (src, data, tmp, 1);
}
else {
data = NULL;
}
return data;
}
static Uint32 Swap32 (Uint32 v) {
return
((v & 0x000000FF) << 16)
| ((v & 0x0000FF00))
| ((v & 0x00FF0000) >> 16)
| ((v & 0xFF000000));
}
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static void xcf_read_property (SDL_RWops * src, xcf_prop * prop) {
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prop->id = SDL_ReadBE32 (src);
prop->length = SDL_ReadBE32 (src);
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#if DEBUG
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printf ("%.8X: %s: %d\n", SDL_RWtell (src), prop->id < 25 ? prop_names [prop->id] : "unknown", prop->length);
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#endif
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switch (prop->id) {
case PROP_COLORMAP:
prop->data.colormap.num = SDL_ReadBE32 (src);
prop->data.colormap.cmap = (char *) malloc (sizeof (char) * prop->data.colormap.num * 3);
SDL_RWread (src, prop->data.colormap.cmap, prop->data.colormap.num*3, 1);
break;
case PROP_OFFSETS:
prop->data.offset.x = SDL_ReadBE32 (src);
prop->data.offset.y = SDL_ReadBE32 (src);
break;
case PROP_OPACITY:
prop->data.opacity = SDL_ReadBE32 (src);
break;
case PROP_COMPRESSION:
case PROP_COLOR:
SDL_RWread (src, &prop->data, prop->length, 1);
break;
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case PROP_VISIBLE:
prop->data.visible = SDL_ReadBE32 (src);
break;
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default:
// SDL_RWread (src, &prop->data, prop->length, 1);
SDL_RWseek (src, prop->length, SEEK_CUR);
}
}
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static void free_xcf_header (xcf_header * h) {
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if (h->cm_num)
free (h->cm_map);
free (h);
}
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static xcf_header * read_xcf_header (SDL_RWops * src) {
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xcf_header * h;
xcf_prop prop;
h = (xcf_header *) malloc (sizeof (xcf_header));
SDL_RWread (src, h->sign, 14, 1);
h->width = SDL_ReadBE32 (src);
h->height = SDL_ReadBE32 (src);
h->image_type = SDL_ReadBE32 (src);
h->properties = NULL;
h->compr = COMPR_NONE;
h->cm_num = 0;
h->cm_map = NULL;
// Just read, don't save
do {
xcf_read_property (src, &prop);
if (prop.id == PROP_COMPRESSION)
h->compr = prop.data.compression;
else if (prop.id == PROP_COLORMAP) {
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// unused var: int i;
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h->cm_num = prop.data.colormap.num;
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h->cm_map = (unsigned char *) malloc (sizeof (unsigned char) * 3 * h->cm_num);
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memcpy (h->cm_map, prop.data.colormap.cmap, 3*sizeof (char)*h->cm_num);
free (prop.data.colormap.cmap);
}
} while (prop.id != PROP_END);
return h;
}
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static void free_xcf_layer (xcf_layer * l) {
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free (l->name);
free (l);
}
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static xcf_layer * read_xcf_layer (SDL_RWops * src) {
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xcf_layer * l;
xcf_prop prop;
l = (xcf_layer *) malloc (sizeof (xcf_layer));
l->width = SDL_ReadBE32 (src);
l->height = SDL_ReadBE32 (src);
l->layer_type = SDL_ReadBE32 (src);
l->name = read_string (src);
do {
xcf_read_property (src, &prop);
if (prop.id == PROP_OFFSETS) {
l->offset_x = prop.data.offset.x;
l->offset_y = prop.data.offset.y;
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} else if (prop.id == PROP_VISIBLE) {
l->visible = prop.data.visible ? 1 : 0;
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}
} while (prop.id != PROP_END);
l->hierarchy_file_offset = SDL_ReadBE32 (src);
l->layer_mask_offset = SDL_ReadBE32 (src);
return l;
}
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static void free_xcf_channel (xcf_channel * c) {
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free (c->name);
free (c);
}
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static xcf_channel * read_xcf_channel (SDL_RWops * src) {
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xcf_channel * l;
xcf_prop prop;
l = (xcf_channel *) malloc (sizeof (xcf_channel));
l->width = SDL_ReadBE32 (src);
l->height = SDL_ReadBE32 (src);
l->name = read_string (src);
l->selection = 0;
do {
xcf_read_property (src, &prop);
switch (prop.id) {
case PROP_OPACITY:
l->opacity = prop.data.opacity << 24;
break;
case PROP_COLOR:
l->color = ((Uint32) prop.data.color[0] << 16)
| ((Uint32) prop.data.color[1] << 8)
| ((Uint32) prop.data.color[2]);
break;
case PROP_SELECTION:
l->selection = 1;
break;
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case PROP_VISIBLE:
l->visible = prop.data.visible ? 1 : 0;
break;
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default:
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;
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}
} while (prop.id != PROP_END);
l->hierarchy_file_offset = SDL_ReadBE32 (src);
return l;
}
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static void free_xcf_hierarchy (xcf_hierarchy * h) {
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free (h->level_file_offsets);
free (h);
}
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static xcf_hierarchy * read_xcf_hierarchy (SDL_RWops * src) {
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xcf_hierarchy * h;
int i;
h = (xcf_hierarchy *) malloc (sizeof (xcf_hierarchy));
h->width = SDL_ReadBE32 (src);
h->height = SDL_ReadBE32 (src);
h->bpp = SDL_ReadBE32 (src);
h->level_file_offsets = NULL;
i = 0;
do {
h->level_file_offsets = (Uint32 *) realloc (h->level_file_offsets, sizeof (Uint32) * (i+1));
h->level_file_offsets [i] = SDL_ReadBE32 (src);
} while (h->level_file_offsets [i++]);
return h;
}
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static void free_xcf_level (xcf_level * l) {
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free (l->tile_file_offsets);
free (l);
}
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static xcf_level * read_xcf_level (SDL_RWops * src) {
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xcf_level * l;
int i;
l = (xcf_level *) malloc (sizeof (xcf_level));
l->width = SDL_ReadBE32 (src);
l->height = SDL_ReadBE32 (src);
l->tile_file_offsets = NULL;
i = 0;
do {
l->tile_file_offsets = (Uint32 *) realloc (l->tile_file_offsets, sizeof (Uint32) * (i+1));
l->tile_file_offsets [i] = SDL_ReadBE32 (src);
} while (l->tile_file_offsets [i++]);
return l;
}
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static void free_xcf_tile (unsigned char * t) {
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free (t);
}
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static unsigned char * load_xcf_tile_none (SDL_RWops * src, Uint32 len, int bpp, int x, int y) {
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unsigned char * load;
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load = (unsigned char *) malloc (len); // expect this is okay
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SDL_RWread (src, load, len, 1);
return load;
}
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static unsigned char * load_xcf_tile_rle (SDL_RWops * src, Uint32 len, int bpp, int x, int y) {
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unsigned char * load, * t, * data, * d;
Uint32 reallen;
int i, size, count, j, length;
unsigned char val;
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t = load = (unsigned char *) malloc (len);
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reallen = SDL_RWread (src, t, 1, len);
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data = (unsigned char *) malloc (x*y*bpp);
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for (i = 0; i < bpp; i++) {
d = data + i;
size = x*y;
count = 0;
while (size > 0) {
val = *t++;
length = val;
if (length >= 128) {
length = 255 - (length - 1);
if (length == 128) {
length = (*t << 8) + t[1];
t += 2;
}
count += length;
size -= length;
while (length-- > 0) {
*d = *t++;
d += bpp;
}
}
else {
length += 1;
if (length == 128) {
length = (*t << 8) + t[1];
t += 2;
}
count += length;
size -= length;
val = *t++;
for (j = 0; j < length; j++) {
*d = val;
d += bpp;
}
}
}
}
free (load);
return (data);
}
static Uint32 rgb2grey (Uint32 a) {
Uint8 l;
l = 0.2990 * ((a && 0x00FF0000) >> 16)
+ 0.5870 * ((a && 0x0000FF00) >> 8)
+ 0.1140 * ((a && 0x000000FF));
return (l << 16) | (l << 8) | l;
}
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static void create_channel_surface (SDL_Surface * surf, xcf_image_type itype, Uint32 color, Uint32 opacity) {
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Uint32 c = 0;
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switch (itype) {
case IMAGE_RGB:
case IMAGE_INDEXED:
c = opacity | color;
break;
case IMAGE_GREYSCALE:
c = opacity | rgb2grey (color);
break;
}
SDL_FillRect (surf, NULL, c);
}
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static int do_layer_surface (SDL_Surface * surface, SDL_RWops * src, xcf_header * head, xcf_layer * layer, load_tile_type load_tile) {
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xcf_hierarchy * hierarchy;
xcf_level * level;
unsigned char * tile;
Uint8 * p8;
Uint16 * p16;
Uint32 * p;
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int x, y, tx, ty, ox, oy, i, j;
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Uint32 *row;
SDL_RWseek (src, layer->hierarchy_file_offset, SEEK_SET);
hierarchy = read_xcf_hierarchy (src);
level = NULL;
for (i = 0; hierarchy->level_file_offsets [i]; i++) {
SDL_RWseek (src, hierarchy->level_file_offsets [i], SEEK_SET);
level = read_xcf_level (src);
ty = tx = 0;
for (j = 0; level->tile_file_offsets [j]; j++) {
SDL_RWseek (src, level->tile_file_offsets [j], SEEK_SET);
ox = tx+64 > level->width ? level->width % 64 : 64;
oy = ty+64 > level->height ? level->height % 64 : 64;
if (level->tile_file_offsets [j+1]) {
tile = load_tile
(src,
level->tile_file_offsets [j+1] - level->tile_file_offsets [j],
hierarchy->bpp,
ox, oy);
}
else {
tile = load_tile
(src,
ox*oy*6,
hierarchy->bpp,
ox, oy);
}
p8 = tile;
p16 = (Uint16 *) p8;
p = (Uint32 *) p8;
for (y=ty; y < ty+oy; y++) {
row = (Uint32 *)((Uint8 *)surface->pixels + y*surface->pitch + tx*4);
switch (hierarchy->bpp) {
case 4:
for (x=tx; x < tx+ox; x++)
*row++ = Swap32 (*p++);
break;
case 3:
for (x=tx; x < tx+ox; x++) {
*row = 0xFF000000;
*row |= ((Uint32) *(p8++) << 16);
*row |= ((Uint32) *(p8++) << 8);
*row |= ((Uint32) *(p8++) << 0);
row++;
}
break;
case 2: // Indexed/Greyscale + Alpha
switch (head->image_type) {
case IMAGE_INDEXED:
for (x=tx; x < tx+ox; x++) {
*row = ((Uint32) (head->cm_map [*p8*3]) << 16);
*row |= ((Uint32) (head->cm_map [*p8*3+1]) << 8);
*row |= ((Uint32) (head->cm_map [*p8++*3+2]) << 0);
*row |= ((Uint32) *p8++ << 24);;
row++;
}
break;
case IMAGE_GREYSCALE:
for (x=tx; x < tx+ox; x++) {
*row = ((Uint32) *p8 << 16);
*row |= ((Uint32) *p8 << 8);
*row |= ((Uint32) *p8++ << 0);
*row |= ((Uint32) *p8++ << 24);;
row++;
}
break;
default:
fprintf (stderr, "Unknown Gimp image type (%d)\n", head->image_type);
return 1;
}
break;
case 1: // Indexed/Greyscale
switch (head->image_type) {
case IMAGE_INDEXED:
for (x = tx; x < tx+ox; x++) {
*row++ = 0xFF000000
| ((Uint32) (head->cm_map [*p8*3]) << 16)
| ((Uint32) (head->cm_map [*p8*3+1]) << 8)
| ((Uint32) (head->cm_map [*p8*3+2]) << 0);
p8++;
}
break;
case IMAGE_GREYSCALE:
for (x=tx; x < tx+ox; x++) {
*row++ = 0xFF000000
| (((Uint32) (*p8)) << 16)
| (((Uint32) (*p8)) << 8)
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| (((Uint32) (*p8)) << 0);
++p8;
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}
break;
default:
fprintf (stderr, "Unknown Gimp image type (%d)\n", head->image_type);
return 1;
}
break;
}
}
tx += 64;
if (tx >= level->width) {
tx = 0;
ty += 64;
}
if (ty >= level->height) {
break;
}
free_xcf_tile (tile);
}
free_xcf_level (level);
}
free_xcf_hierarchy (hierarchy);
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return 0;
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}
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SDL_Surface *IMG_LoadXCF_RW(SDL_RWops *src)
{
int start;
const char *error = NULL;
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SDL_Surface *surface, *lays;
xcf_header * head;
xcf_layer * layer;
xcf_channel ** channel;
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int chnls, i, offsets;
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Uint32 offset, fp;
unsigned char * (* load_tile) (SDL_RWops *, Uint32, int, int, int);
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if ( !src ) {
/* The error message has been set in SDL_RWFromFile */
return NULL;
}
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start = SDL_RWtell(src);
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/* Initialize the data we will clean up when we're done */
surface = NULL;
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713
714
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head = read_xcf_header (src);
switch (head->compr) {
case COMPR_NONE:
load_tile = load_xcf_tile_none;
break;
case COMPR_RLE:
load_tile = load_xcf_tile_rle;
break;
default:
fprintf (stderr, "Unsupported Compression.\n");
free_xcf_header (head);
return NULL;
}
/* Create the surface of the appropriate type */
surface = SDL_AllocSurface(SDL_SWSURFACE, head->width, head->height, 32,
0x00FF0000,0x0000FF00,0x000000FF,0xFF000000);
if ( surface == NULL ) {
717
error = "Out of memory";
718
719
720
721
722
723
goto done;
}
head->layer_file_offsets = NULL;
offsets = 0;
724
while ((offset = SDL_ReadBE32 (src))) {
725
726
727
728
729
730
731
732
733
734
head->layer_file_offsets = (Uint32 *) realloc (head->layer_file_offsets, sizeof (Uint32) * (offsets+1));
head->layer_file_offsets [offsets] = offset;
offsets++;
}
fp = SDL_RWtell (src);
lays = SDL_AllocSurface(SDL_SWSURFACE, head->width, head->height, 32,
0x00FF0000,0x0000FF00,0x000000FF,0xFF000000);
if ( lays == NULL ) {
735
error = "Out of memory";
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
goto done;
}
// Blit layers backwards, because Gimp saves them highest first
for (i = offsets; i > 0; i--) {
SDL_Rect rs, rd;
SDL_RWseek (src, head->layer_file_offsets [i-1], SEEK_SET);
layer = read_xcf_layer (src);
do_layer_surface (lays, src, head, layer, load_tile);
rs.x = 0;
rs.y = 0;
rs.w = layer->width;
rs.h = layer->height;
rd.x = layer->offset_x;
rd.y = layer->offset_y;
rd.w = layer->width;
rd.h = layer->height;
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756
757
if (layer->visible)
SDL_BlitSurface (lays, &rs, surface, &rd);
free_xcf_layer (layer);
758
759
760
761
762
763
764
765
766
}
SDL_FreeSurface (lays);
SDL_RWseek (src, fp, SEEK_SET);
// read channels
channel = NULL;
chnls = 0;
767
while ((offset = SDL_ReadBE32 (src))) {
768
769
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774
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776
777
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780
781
channel = (xcf_channel **) realloc (channel, sizeof (xcf_channel *) * (chnls+1));
fp = SDL_RWtell (src);
SDL_RWseek (src, offset, SEEK_SET);
channel [chnls++] = (read_xcf_channel (src));
SDL_RWseek (src, fp, SEEK_SET);
}
if (chnls) {
SDL_Surface * chs;
chs = SDL_AllocSurface(SDL_SWSURFACE, head->width, head->height, 32,
0x00FF0000,0x0000FF00,0x000000FF,0xFF000000);
if (chs == NULL) {
782
error = "Out of memory";
783
784
785
786
goto done;
}
for (i = 0; i < chnls; i++) {
// printf ("CNLBLT %i\n", i);
787
if (!channel [i]->selection && channel [i]->visible) {
788
789
790
791
792
793
794
795
796
create_channel_surface (chs, head->image_type, channel [i]->color, channel [i]->opacity);
SDL_BlitSurface (chs, NULL, surface, NULL);
}
free_xcf_channel (channel [i]);
}
SDL_FreeSurface (chs);
}
797
done:
798
free_xcf_header (head);
799
800
801
802
803
804
805
if ( error ) {
SDL_RWseek(src, start, SEEK_SET);
if ( surface ) {
SDL_FreeSurface(surface);
surface = NULL;
}
IMG_SetError(error);
806
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808
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810
811
812
813
814
815
816
817
818
819
820
821
822
823
824
825
}
return(surface);
}
#else
/* See if an image is contained in a data source */
int IMG_isXCF(SDL_RWops *src)
{
return(0);
}
/* Load a XCF type image from an SDL datasource */
SDL_Surface *IMG_LoadXCF_RW(SDL_RWops *src)
{
return(NULL);
}
#endif /* LOAD_XCF */