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IMG_xcf.c
946 lines (811 loc) · 23.8 KB
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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) 1997-2019 Sam Lantinga <slouken@libsdl.org>
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This software is provided 'as-is', without any express or implied
warranty. In no event will the authors be held liable for any damages
arising from the use of this software.
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Permission is granted to anyone to use this software for any purpose,
including commercial applications, and to alter it and redistribute it
freely, subject to the following restrictions:
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1. The origin of this software must not be misrepresented; you must not
claim that you wrote the original software. If you use this software
in a product, an acknowledgment in the product documentation would be
appreciated but is not required.
2. Altered source versions must be plainly marked as such, and must not be
misrepresented as being the original software.
3. This notice may not be removed or altered from any source distribution.
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*/
/* This is a XCF image file loading framework */
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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];
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Uint32 file_version;
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Uint32 width;
Uint32 height;
Sint32 image_type;
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Uint32 precision;
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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)
{
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Sint64 start;
int is_XCF;
char magic[14];
if ( !src )
return 0;
start = SDL_RWtell(src);
is_XCF = 0;
if ( SDL_RWread(src, magic, sizeof(magic), 1) ) {
if (SDL_strncmp(magic, "gimp xcf ", 9) == 0) {
is_XCF = 1;
}
}
SDL_RWseek(src, start, RW_SEEK_SET);
return(is_XCF);
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}
static char * read_string (SDL_RWops * src) {
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Sint64 remaining;
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Uint32 tmp;
char * data;
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tmp = SDL_ReadBE32(src);
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remaining = SDL_RWsize(src) - SDL_RWtell(src);
if (tmp > 0 && (Sint32)tmp <= remaining) {
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data = (char *) SDL_malloc (sizeof (char) * tmp);
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if (data) {
SDL_RWread(src, data, tmp, 1);
data[tmp - 1] = '\0';
}
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}
else {
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data = NULL;
}
return data;
}
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static Uint64 read_offset (SDL_RWops * src, const xcf_header * h) {
Uint64 offset; // starting with version 11, offsets are 64 bits
offset = (h->file_version >= 11) ? (Uint64)SDL_ReadBE32 (src) << 32 : 0;
offset |= SDL_ReadBE32 (src);
return offset;
}
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static Uint32 Swap32 (Uint32 v) {
return
((v & 0x000000FF) << 16)
| ((v & 0x0000FF00))
| ((v & 0x00FF0000) >> 16)
| ((v & 0xFF000000));
}
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static int xcf_read_property (SDL_RWops * src, xcf_prop * prop) {
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Uint32 len;
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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(%u): %u\n", SDL_RWtell (src), prop->id < 25 ? prop_names [prop->id] : "unknown", prop->id, prop->length);
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#endif
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switch (prop->id) {
case PROP_COLORMAP:
prop->data.colormap.num = SDL_ReadBE32 (src);
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prop->data.colormap.cmap = (char *) SDL_malloc (sizeof (char) * prop->data.colormap.num * 3);
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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:
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if (prop->length > sizeof(prop->data)) {
len = sizeof(prop->data);
} else {
len = prop->length;
}
SDL_RWread(src, &prop->data, len, 1);
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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);
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if (SDL_RWseek (src, prop->length, RW_SEEK_CUR) < 0)
return 0; // ERROR
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}
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return 1; // OK
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}
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static void free_xcf_header (xcf_header * h) {
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if (h->cm_num)
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SDL_free (h->cm_map);
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if (h->layer_file_offsets)
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SDL_free (h->layer_file_offsets);
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SDL_free (h);
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}
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static xcf_header * read_xcf_header (SDL_RWops * src) {
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xcf_header * h;
xcf_prop prop;
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h = (xcf_header *) SDL_malloc (sizeof (xcf_header));
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if (!h) {
return NULL;
}
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SDL_RWread (src, h->sign, 14, 1);
h->width = SDL_ReadBE32 (src);
h->height = SDL_ReadBE32 (src);
h->image_type = SDL_ReadBE32 (src);
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h->file_version = (h->sign[10] - '0') * 100 + (h->sign[11] - '0') * 10 + (h->sign[12] - '0');
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#ifdef DEBUG
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printf ("XCF signature : %.14s (version %u)\n", h->sign, h->file_version);
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printf (" (%u,%u) type=%u\n", h->width, h->height, h->image_type);
#endif
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if (h->file_version >= 4)
h->precision = SDL_ReadBE32 (src);
else
h->precision = 150;
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h->properties = NULL;
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h->layer_file_offsets = NULL;
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h->compr = COMPR_NONE;
h->cm_num = 0;
h->cm_map = NULL;
// Just read, don't save
do {
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if (!xcf_read_property (src, &prop)) {
free_xcf_header (h);
return NULL;
}
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if (prop.id == PROP_COMPRESSION)
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h->compr = (xcf_compr_type)prop.data.compression;
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else if (prop.id == PROP_COLORMAP) {
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// unused var: int i;
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Uint32 cm_num;
unsigned char *cm_map;
cm_num = prop.data.colormap.num;
cm_map = (unsigned char *) SDL_realloc(h->cm_map, sizeof (unsigned char) * 3 * cm_num);
if (cm_map) {
h->cm_num = cm_num;
h->cm_map = cm_map;
SDL_memcpy (h->cm_map, prop.data.colormap.cmap, 3*sizeof (char)*h->cm_num);
}
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SDL_free (prop.data.colormap.cmap);
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if (!cm_map) {
free_xcf_header(h);
return NULL;
}
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}
} while (prop.id != PROP_END);
return h;
}
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static void free_xcf_layer (xcf_layer * l) {
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SDL_free (l->name);
SDL_free (l);
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}
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static xcf_layer * read_xcf_layer (SDL_RWops * src, const xcf_header * h) {
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xcf_layer * l;
xcf_prop prop;
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l = (xcf_layer *) SDL_malloc (sizeof (xcf_layer));
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l->width = SDL_ReadBE32 (src);
l->height = SDL_ReadBE32 (src);
l->layer_type = SDL_ReadBE32 (src);
l->name = read_string (src);
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#ifdef DEBUG
printf ("layer (%d,%d) type=%d '%s'\n", l->width, l->height, l->layer_type, l->name);
#endif
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do {
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if (!xcf_read_property (src, &prop)) {
free_xcf_layer (l);
return NULL;
}
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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);
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l->hierarchy_file_offset = read_offset (src, h);
l->layer_mask_offset = read_offset (src, h);
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return l;
}
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static void free_xcf_channel (xcf_channel * c) {
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SDL_free (c->name);
SDL_free (c);
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}
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static xcf_channel * read_xcf_channel (SDL_RWops * src, const xcf_header * h) {
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xcf_channel * l;
xcf_prop prop;
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l = (xcf_channel *) SDL_malloc (sizeof (xcf_channel));
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l->width = SDL_ReadBE32 (src);
l->height = SDL_ReadBE32 (src);
l->name = read_string (src);
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#ifdef DEBUG
printf ("channel (%u,%u) '%s'\n", l->width, l->height, l->name);
#endif
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l->selection = 0;
do {
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if (!xcf_read_property (src, &prop)) {
free_xcf_channel (l);
return NULL;
}
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switch (prop.id) {
case PROP_OPACITY:
l->opacity = prop.data.opacity << 24;
break;
case PROP_COLOR:
l->color = ((Uint32) prop.data.color[0] << 16)
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| ((Uint32) prop.data.color[1] << 8)
| ((Uint32) prop.data.color[2]);
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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);
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l->hierarchy_file_offset = read_offset (src, h);
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return l;
}
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static void free_xcf_hierarchy (xcf_hierarchy * h) {
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SDL_free (h->level_file_offsets);
SDL_free (h);
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}
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static xcf_hierarchy * read_xcf_hierarchy (SDL_RWops * src, const xcf_header * head) {
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xcf_hierarchy * h;
int i;
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h = (xcf_hierarchy *) SDL_malloc (sizeof (xcf_hierarchy));
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h->width = SDL_ReadBE32 (src);
h->height = SDL_ReadBE32 (src);
h->bpp = SDL_ReadBE32 (src);
h->level_file_offsets = NULL;
i = 0;
do {
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h->level_file_offsets = (Uint32 *) SDL_realloc (h->level_file_offsets, sizeof (Uint32) * (i+1));
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h->level_file_offsets [i] = read_offset (src, head);
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} while (h->level_file_offsets [i++]);
return h;
}
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static void free_xcf_level (xcf_level * l) {
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SDL_free (l->tile_file_offsets);
SDL_free (l);
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}
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static xcf_level * read_xcf_level (SDL_RWops * src, const xcf_header * h) {
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xcf_level * l;
int i;
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l = (xcf_level *) SDL_malloc (sizeof (xcf_level));
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l->width = SDL_ReadBE32 (src);
l->height = SDL_ReadBE32 (src);
l->tile_file_offsets = NULL;
i = 0;
do {
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l->tile_file_offsets = (Uint32 *) SDL_realloc (l->tile_file_offsets, sizeof (Uint32) * (i+1));
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l->tile_file_offsets [i] = read_offset (src, h);
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} while (l->tile_file_offsets [i++]);
return l;
}
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static void free_xcf_tile (unsigned char * t) {
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SDL_free (t);
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}
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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 *) SDL_malloc (len); // expect this is okay
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if (load != NULL)
SDL_RWread (src, load, len, 1);
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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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if (len == 0) { /* probably bogus data. */
return NULL;
}
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t = load = (unsigned char *) SDL_malloc (len);
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if (load == NULL)
return NULL;
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reallen = SDL_RWread (src, t, 1, len);
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data = (unsigned char *) SDL_calloc (1, x*y*bpp);
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for (i = 0; i < bpp; i++) {
d = data + i;
size = x*y;
count = 0;
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while (size > 0) {
val = *t++;
length = val;
if (length >= 128) {
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length = 255 - (length - 1);
if (length == 128) {
length = (*t << 8) + t[1];
t += 2;
}
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if (((size_t) (t - load) + length) >= len) {
break; /* bogus data */
} else if (length > size) {
break; /* bogus data */
}
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count += length;
size -= length;
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while (length-- > 0) {
*d = *t++;
d += bpp;
}
} else {
length += 1;
if (length == 128) {
length = (*t << 8) + t[1];
t += 2;
}
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if (((size_t) (t - load)) >= len) {
break; /* bogus data */
} else if (length > size) {
break; /* bogus data */
}
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count += length;
size -= length;
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val = *t++;
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for (j = 0; j < length; j++) {
*d = val;
d += bpp;
}
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}
}
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if (size > 0) {
break; /* just drop out, untouched data initialized to zero. */
}
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}
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SDL_free (load);
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return (data);
}
static Uint32 rgb2grey (Uint32 a) {
Uint8 l;
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l = (Uint8)(0.2990 * ((a & 0x00FF0000) >> 16)
+ 0.5870 * ((a & 0x0000FF00) >> 8)
+ 0.1140 * ((a & 0x000000FF)));
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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)
{
xcf_hierarchy *hierarchy;
xcf_level *level;
unsigned char *tile;
Uint8 *p8;
Uint16 *p16;
Uint32 *p;
int i, j;
Uint32 x, y, tx, ty, ox, oy;
Uint32 *row;
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Uint32 length;
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SDL_RWseek(src, layer->hierarchy_file_offset, RW_SEEK_SET);
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hierarchy = read_xcf_hierarchy(src, head);
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if (hierarchy->bpp > 4) { /* unsupported. */
SDL_Log("Unknown Gimp image bpp (%u)\n", (unsigned int) hierarchy->bpp);
free_xcf_hierarchy(hierarchy);
return 1;
}
if ((hierarchy->width > 20000) || (hierarchy->height > 20000)) { /* arbitrary limit to avoid integer overflow. */
SDL_Log("Gimp image too large (%ux%u)\n", (unsigned int) hierarchy->width, (unsigned int) hierarchy->height);
free_xcf_hierarchy(hierarchy);
return 1;
}
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level = NULL;
for (i = 0; hierarchy->level_file_offsets[i]; i++) {
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if (SDL_RWseek(src, hierarchy->level_file_offsets[i], RW_SEEK_SET) < 0)
break;
if (i > 0) // skip level except the 1st one, just like GIMP does
continue;
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level = read_xcf_level(src, head);
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ty = tx = 0;
for (j = 0; level->tile_file_offsets[j]; j++) {
SDL_RWseek(src, level->tile_file_offsets[j], RW_SEEK_SET);
ox = tx + 64 > level->width ? level->width % 64 : 64;
oy = ty + 64 > level->height ? level->height % 64 : 64;
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length = ox*oy*6;
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if (level->tile_file_offsets[j + 1] > level->tile_file_offsets[j]) {
length = level->tile_file_offsets[j + 1] - level->tile_file_offsets[j];
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}
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tile = load_tile(src, length, hierarchy->bpp, ox, oy);
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if (!tile) {
if (hierarchy) {
free_xcf_hierarchy(hierarchy);
}
if (level) {
free_xcf_level(level);
}
return 1;
}
683
684
685
686
p8 = tile;
p16 = (Uint16 *) p8;
p = (Uint32 *) p8;
for (y = ty; y < ty + oy; y++) {
687
688
689
if ((ty >= surface->h) || ((tx+ox) > surface->w)) {
break;
}
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
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:
727
SDL_Log("Unknown Gimp image type (%d)\n", head->image_type);
728
729
730
731
732
733
734
735
736
737
if (hierarchy) {
free_xcf_hierarchy(hierarchy);
}
if (level)
free_xcf_level(level);
return 1;
}
break;
case 1:
/* Indexed / Greyscale */
738
switch (head->image_type) {
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
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)
| (((Uint32)(*p8)) << 0);
++p8;
}
break;
default:
758
SDL_Log("Unknown Gimp image type (%d)\n", head->image_type);
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
if (tile)
free_xcf_tile(tile);
if (level)
free_xcf_level(level);
if (hierarchy)
free_xcf_hierarchy(hierarchy);
return 1;
}
break;
}
}
free_xcf_tile(tile);
tx += 64;
if (tx >= level->width) {
tx = 0;
ty += 64;
}
if (ty >= level->height) {
break;
}
780
}
781
free_xcf_level(level);
782
}
783
784
free_xcf_hierarchy(hierarchy);
785
786
return 0;
787
788
}
789
790
SDL_Surface *IMG_LoadXCF_RW(SDL_RWops *src)
{
791
Sint64 start;
792
const char *error = NULL;
793
794
795
796
SDL_Surface *surface, *lays;
xcf_header * head;
xcf_layer * layer;
xcf_channel ** channel;
797
int chnls, i, offsets;
798
Sint64 offset, fp;
799
800
801
unsigned char * (* load_tile) (SDL_RWops *, Uint32, int, int, int);
802
if (!src) {
803
804
805
/* The error message has been set in SDL_RWFromFile */
return NULL;
}
806
start = SDL_RWtell(src);
807
808
809
810
/* Initialize the data we will clean up when we're done */
surface = NULL;
811
812
813
814
head = read_xcf_header(src);
if (!head) {
return NULL;
}
815
816
817
818
819
820
821
822
823
switch (head->compr) {
case COMPR_NONE:
load_tile = load_xcf_tile_none;
break;
case COMPR_RLE:
load_tile = load_xcf_tile_rle;
break;
default:
824
SDL_Log("Unsupported Compression.\n");
825
826
827
828
829
free_xcf_header (head);
return NULL;
}
/* Create the surface of the appropriate type */
830
surface = SDL_CreateRGBSurface(SDL_SWSURFACE, head->width, head->height, 32,
831
0x00FF0000,0x0000FF00,0x000000FF,0xFF000000);
832
833
if ( surface == NULL ) {
834
error = "Out of memory";
835
836
837
838
839
goto done;
}
offsets = 0;
840
while ((offset = read_offset (src, head))) {
841
head->layer_file_offsets = (Uint32 *) SDL_realloc (head->layer_file_offsets, sizeof (Uint32) * (offsets+1));
842
head->layer_file_offsets [offsets] = (Uint32)offset;
843
844
845
offsets++;
}
fp = SDL_RWtell (src);
846
847
lays = SDL_CreateRGBSurface(SDL_SWSURFACE, head->width, head->height, 32,
848
0x00FF0000,0x0000FF00,0x000000FF,0xFF000000);
849
850
if ( lays == NULL ) {
851
error = "Out of memory";
852
853
854
855
856
857
goto done;
}
// Blit layers backwards, because Gimp saves them highest first
for (i = offsets; i > 0; i--) {
SDL_Rect rs, rd;
858
SDL_RWseek (src, head->layer_file_offsets [i-1], RW_SEEK_SET);
859
860
861
862
863
864
865
866
867
868
869
870
871
872
873
874
875
layer = read_xcf_layer (src, head);
if (layer != NULL) {
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;
if (layer->visible)
SDL_BlitSurface (lays, &rs, surface, &rd);
free_xcf_layer (layer);
}
876
877
878
879
}
SDL_FreeSurface (lays);
880
SDL_RWseek (src, fp, RW_SEEK_SET);
881
882
883
884
// read channels
channel = NULL;
chnls = 0;
885
while ((offset = read_offset (src, head))) {
886
channel = (xcf_channel **) SDL_realloc (channel, sizeof (xcf_channel *) * (chnls+1));
887
fp = SDL_RWtell (src);
888
SDL_RWseek (src, offset, RW_SEEK_SET);
889
channel [chnls] = (read_xcf_channel (src, head));
890
891
if (channel [chnls] != NULL)
chnls++;
892
SDL_RWseek (src, fp, RW_SEEK_SET);
893
894
895
896
897
}
if (chnls) {
SDL_Surface * chs;
898
chs = SDL_CreateRGBSurface(SDL_SWSURFACE, head->width, head->height, 32,
899
0x00FF0000,0x0000FF00,0x000000FF,0xFF000000);
900
901
if (chs == NULL) {
902
error = "Out of memory";
903
904
905
906
goto done;
}
for (i = 0; i < chnls; i++) {
// printf ("CNLBLT %i\n", i);
907
if (!channel [i]->selection && channel [i]->visible) {
908
909
create_channel_surface (chs, (xcf_image_type)head->image_type, channel [i]->color, channel [i]->opacity);
SDL_BlitSurface (chs, NULL, surface, NULL);
910
911
912
}
free_xcf_channel (channel [i]);
}
913
SDL_free(channel);
914
915
916
917
SDL_FreeSurface (chs);
}
918
done:
919
free_xcf_header (head);
920
if ( error ) {
921
SDL_RWseek(src, start, RW_SEEK_SET);
922
923
924
925
if ( surface ) {
SDL_FreeSurface(surface);
surface = NULL;
}
926
IMG_SetError("%s", error);
927
928
929
930
931
932
933
934
935
936
937
938
939
940
941
942
943
944
945
946
}
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 */