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.

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:

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.

*/

/* This is a XCF image file loading framework */

#include <stdio.h>

#include <ctype.h>

#include <string.h>

#include "SDL_image.h"

#ifdef LOAD_XCF

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"

};

#endif

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;

} xcf_layer;

typedef struct {

Uint32 width;

Uint32 height;

char * name;

xcf_prop * properties;

Uint32 hierarchy_file_offset;

Uint32 color;

Uint32 opacity;

int selection;

int visible;

} 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 */

int IMG_isXCF(SDL_RWops *src)

{

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);

}

static char * read_string (SDL_RWops * src) {

Uint32 tmp;

char * data;

tmp = SDL_ReadBE32 (src);

if (tmp > 0) {

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));

}

prop->id = SDL_ReadBE32 (src);

prop->length = SDL_ReadBE32 (src);

switch (prop->id) {

case PROP_COLORMAP:

prop->data.colormap.num = SDL_ReadBE32 (src);

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:

if (prop->length > sizeof(prop->data)) {

len = sizeof(prop->data);

} else {

len = prop->length;

}

SDL_RWread(src, &prop->data, len, 1);

case PROP_VISIBLE:

prop->data.visible = SDL_ReadBE32 (src);

break;

default:

// SDL_RWread (src, &prop->data, prop->length, 1);

}

}

}

xcf_header * h;

xcf_prop prop;

if (!h) {

return NULL;

}

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)

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);

}

if (!cm_map) {

free_xcf_header(h);

return NULL;

}

}

} while (prop.id != PROP_END);

return h;

}

SDL_free (l->name);

SDL_free (l);

}

xcf_layer * l;

xcf_prop prop;

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;

} else if (prop.id == PROP_VISIBLE) {

l->visible = prop.data.visible ? 1 : 0;

}

} while (prop.id != PROP_END);

l->hierarchy_file_offset = SDL_ReadBE32 (src);

l->layer_mask_offset = SDL_ReadBE32 (src);

return l;

}

SDL_free (c->name);

SDL_free (c);

}

xcf_channel * l;

xcf_prop prop;

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;

case PROP_VISIBLE:

l->visible = prop.data.visible ? 1 : 0;

break;

}

} while (prop.id != PROP_END);

l->hierarchy_file_offset = SDL_ReadBE32 (src);

return l;

}

SDL_free (h->level_file_offsets);

SDL_free (h);

}

xcf_hierarchy * h;

int i;

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 [i] = SDL_ReadBE32 (src);

} while (h->level_file_offsets [i++]);

return h;

}

SDL_free (l->tile_file_offsets);

SDL_free (l);

}

xcf_level * l;

int i;

l->width = SDL_ReadBE32 (src);

l->height = SDL_ReadBE32 (src);

l->tile_file_offsets = NULL;

i = 0;

do {

l->tile_file_offsets [i] = SDL_ReadBE32 (src);

} while (l->tile_file_offsets [i++]);

return l;

}

}

unsigned char * load;

SDL_RWread (src, load, len, 1);

return load;

}

unsigned char * load, * t, * data, * d;

Uint32 reallen;

int i, size, count, j, length;

unsigned char val;

reallen = SDL_RWread (src, t, 1, len);

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;

for (j = 0; j < length; j++) {

*d = val;

d += bpp;

}

}

}

}

return (data);

}

static Uint32 rgb2grey (Uint32 a) {

Uint8 l;

l = (Uint8)(0.2990 * ((a & 0x00FF0000) >> 16)

+ 0.5870 * ((a & 0x0000FF00) >> 8)

+ 0.1140 * ((a & 0x000000FF)));

return (l << 16) | (l << 8) | l;

}

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);

}

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;

SDL_RWseek(src, layer->hierarchy_file_offset, RW_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], RW_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], RW_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);

if (hierarchy) {

if (hierarchy->level_file_offsets)

SDL_free(hierarchy->level_file_offsets);

free_xcf_hierarchy(hierarchy);

}

if (level)

free_xcf_level(level);

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)

| (((Uint32)(*p8)) << 0);

++p8;

}

break;

default:

fprintf(stderr, "Unknown Gimp image type (%d)\n", head->image_type);

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;

}

}

SDL_Surface *IMG_LoadXCF_RW(SDL_RWops *src)

{

SDL_Surface *surface, *lays;

xcf_header * head;

xcf_layer * layer;

xcf_channel ** channel;

unsigned char * (* load_tile) (SDL_RWops *, Uint32, int, int, int);

/* The error message has been set in SDL_RWFromFile */

return NULL;

}

/* Initialize the data we will clean up when we're done */

surface = NULL;

head = read_xcf_header(src);

if (!head) {

return NULL;

}

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 */

if ( surface == NULL ) {

goto done;

}

offsets = 0;

offsets++;

}

fp = SDL_RWtell (src);

if ( lays == NULL ) {

goto done;

}

// Blit layers backwards, because Gimp saves them highest first

for (i = offsets; i > 0; i--) {

SDL_Rect rs, rd;

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;

if (layer->visible)

SDL_BlitSurface (lays, &rs, surface, &rd);

free_xcf_layer (layer);

}

SDL_FreeSurface (lays);

// read channels

channel = NULL;

chnls = 0;

}

if (chnls) {

SDL_Surface * chs;

if (chs == NULL) {

goto done;

}

for (i = 0; i < chnls; i++) {

// printf ("CNLBLT %i\n", i);

create_channel_surface (chs, (xcf_image_type)head->image_type, channel [i]->color, channel [i]->opacity);

SDL_BlitSurface (chs, NULL, surface, NULL);

}

free_xcf_channel (channel [i]);

}

SDL_FreeSurface (chs);

}

if ( surface ) {

SDL_FreeSurface(surface);

surface = NULL;

}