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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) 1997-2013 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 */
#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)
{
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Sint64 start;
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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) ) {
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if (SDL_strncmp(magic, "gimp xcf ", 9) == 0) {
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is_XCF = 1;
}
}
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SDL_RWseek(src, start, RW_SEEK_SET);
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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);
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SDL_RWseek (src, prop->length, RW_SEEK_CUR);
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}
}
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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)
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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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h->cm_num = prop.data.colormap.num;
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h->cm_map = (unsigned char *) SDL_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;
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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);
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;
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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] = 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 *) SDL_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 *) SDL_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;
}
}
}
}
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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) {
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xcf_hierarchy * hierarchy;
xcf_level * level;
unsigned char * tile;
Uint8 * p8;
Uint16 * p16;
Uint32 * p;
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int i, j;
Uint32 x, y, tx, ty, ox, oy;
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Uint32 *row;
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SDL_RWseek (src, layer->hierarchy_file_offset, RW_SEEK_SET);
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hierarchy = read_xcf_hierarchy (src);
level = NULL;
for (i = 0; hierarchy->level_file_offsets [i]; i++) {
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SDL_RWseek (src, hierarchy->level_file_offsets [i], RW_SEEK_SET);
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level = read_xcf_level (src);
ty = tx = 0;
for (j = 0; level->tile_file_offsets [j]; j++) {
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SDL_RWseek (src, level->tile_file_offsets [j], RW_SEEK_SET);
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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)
{
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Sint64 start;
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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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Sint64 offset, fp;
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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;
}
692
start = SDL_RWtell(src);
693
694
695
696
/* Initialize the data we will clean up when we're done */
surface = NULL;
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
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 */
713
surface = SDL_CreateRGBSurface(SDL_SWSURFACE, head->width, head->height, 32,
714
715
716
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
head->layer_file_offsets = (Uint32 *) realloc (head->layer_file_offsets, sizeof (Uint32) * (offsets+1));
726
head->layer_file_offsets [offsets] = (Uint32)offset;
727
728
729
730
offsets++;
}
fp = SDL_RWtell (src);
731
lays = SDL_CreateRGBSurface(SDL_SWSURFACE, head->width, head->height, 32,
732
733
734
0x00FF0000,0x0000FF00,0x000000FF,0xFF000000);
if ( lays == NULL ) {
735
error = "Out of memory";
736
737
738
739
740
741
goto done;
}
// Blit layers backwards, because Gimp saves them highest first
for (i = offsets; i > 0; i--) {
SDL_Rect rs, rd;
742
SDL_RWseek (src, head->layer_file_offsets [i-1], RW_SEEK_SET);
743
744
745
746
747
748
749
750
751
752
753
754
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;
755
756
757
if (layer->visible)
SDL_BlitSurface (lays, &rs, surface, &rd);
free_xcf_layer (layer);
758
759
760
761
}
SDL_FreeSurface (lays);
762
SDL_RWseek (src, fp, RW_SEEK_SET);
763
764
765
766
// read channels
channel = NULL;
chnls = 0;
767
while ((offset = SDL_ReadBE32 (src))) {
768
channel = (xcf_channel **) SDL_realloc (channel, sizeof (xcf_channel *) * (chnls+1));
769
fp = SDL_RWtell (src);
770
SDL_RWseek (src, offset, RW_SEEK_SET);
771
channel [chnls++] = (read_xcf_channel (src));
772
SDL_RWseek (src, fp, RW_SEEK_SET);
773
774
775
776
777
}
if (chnls) {
SDL_Surface * chs;
778
chs = SDL_CreateRGBSurface(SDL_SWSURFACE, head->width, head->height, 32,
779
780
781
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
create_channel_surface (chs, (xcf_image_type)head->image_type, channel [i]->color, channel [i]->opacity);
789
790
791
792
793
794
795
796
SDL_BlitSurface (chs, NULL, surface, NULL);
}
free_xcf_channel (channel [i]);
}
SDL_FreeSurface (chs);
}
797
done:
798
free_xcf_header (head);
799
if ( error ) {
800
SDL_RWseek(src, start, RW_SEEK_SET);
801
802
803
804
805
if ( surface ) {
SDL_FreeSurface(surface);
surface = NULL;
}
IMG_SetError(error);
806
807
808
809
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 */