IMG_xcf.c
author Sam Lantinga <slouken@libsdl.org>
Tue, 21 May 2013 21:24:32 -0700
changeset 368 8a61842d00ce
parent 367 b2aa197f6774
child 415 1700d607fce3
permissions -rw-r--r--
Cleaned up whitespace for the 2.0.0 release
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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
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  warranty.  In no event will the authors be held liable for any damages
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  arising from the use of this software.
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  Permission is granted to anyone to use this software for any purpose,
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  including commercial applications, and to alter it and redistribute it
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  freely, subject to the following restrictions:
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  1. The origin of this software must not be misrepresented; you must not
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     claim that you wrote the original software. If you use this software
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     in a product, an acknowledgment in the product documentation would be
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     appreciated but is not required.
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  2. Altered source versions must be plainly marked as such, and must not be
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     misrepresented as being the original software.
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  3. This notice may not be removed or altered from any source distribution.
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*/
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/* This is a XCF image file loading framework */
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#include <stdio.h>
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#include <ctype.h>
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#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"
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#ifdef LOAD_XCF
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#if DEBUG
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static char prop_names [][30] = {
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  "end",
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  "colormap",
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  "active_layer",
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  "active_channel",
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  "selection",
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  "floating_selection",
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  "opacity",
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  "mode",
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  "visible",
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  "linked",
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  "preserve_transparency",
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  "apply_mask",
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  "edit_mask",
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  "show_mask",
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  "show_masked",
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  "offsets",
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  "color",
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  "compression",
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  "guides",
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  "resolution",
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  "tattoo",
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  "parasites",
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  "unit",
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  "paths",
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  "user_unit"
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};
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#endif
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typedef enum
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{
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  PROP_END = 0,
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  PROP_COLORMAP = 1,
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  PROP_ACTIVE_LAYER = 2,
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  PROP_ACTIVE_CHANNEL = 3,
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  PROP_SELECTION = 4,
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  PROP_FLOATING_SELECTION = 5,
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  PROP_OPACITY = 6,
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  PROP_MODE = 7,
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  PROP_VISIBLE = 8,
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  PROP_LINKED = 9,
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  PROP_PRESERVE_TRANSPARENCY = 10,
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  PROP_APPLY_MASK = 11,
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  PROP_EDIT_MASK = 12,
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  PROP_SHOW_MASK = 13,
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  PROP_SHOW_MASKED = 14,
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  PROP_OFFSETS = 15,
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  PROP_COLOR = 16,
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  PROP_COMPRESSION = 17,
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  PROP_GUIDES = 18,
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  PROP_RESOLUTION = 19,
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  PROP_TATTOO = 20,
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  PROP_PARASITES = 21,
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  PROP_UNIT = 22,
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  PROP_PATHS = 23,
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  PROP_USER_UNIT = 24
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} xcf_prop_type;
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typedef enum {
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  COMPR_NONE    = 0,
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  COMPR_RLE     = 1,
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  COMPR_ZLIB    = 2,
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  COMPR_FRACTAL = 3
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} xcf_compr_type;
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typedef enum {
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  IMAGE_RGB       = 0,
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  IMAGE_GREYSCALE = 1,
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  IMAGE_INDEXED   = 2
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} xcf_image_type;
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typedef struct {
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  Uint32 id;
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  Uint32 length;
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  union {
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    struct {
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      Uint32 num;
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      char * cmap;
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    } colormap; // 1
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    struct {
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      Uint32 drawable_offset;
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    } floating_selection; // 5
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    Sint32 opacity;
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    Sint32 mode;
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    int    visible;
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    int    linked;
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    int    preserve_transparency;
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    int    apply_mask;
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    int    show_mask;
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    struct {
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      Sint32 x;
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      Sint32 y;
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    } offset;
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    unsigned char color [3];
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    Uint8 compression;
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    struct {
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      Sint32 x;
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      Sint32 y;
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    } resolution;
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    struct {
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      char * name;
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      Uint32 flags;
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      Uint32 size;
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      char * data;
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    } parasite;
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  } data;
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} xcf_prop;
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typedef struct {
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  char   sign [14];
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  Uint32 width;
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  Uint32 height;
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  Sint32 image_type;
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  xcf_prop * properties;
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  Uint32 * layer_file_offsets;
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  Uint32 * channel_file_offsets;
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  xcf_compr_type compr;
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  Uint32         cm_num;
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  unsigned char * cm_map;
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} xcf_header;
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typedef struct {
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  Uint32 width;
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  Uint32 height;
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  Sint32 layer_type;
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  char * name;
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  xcf_prop * properties;
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  Uint32 hierarchy_file_offset;
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  Uint32 layer_mask_offset;
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  Uint32 offset_x;
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  Uint32 offset_y;
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  int visible;
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} xcf_layer;
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typedef struct {
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  Uint32 width;
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  Uint32 height;
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  char * name;
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  xcf_prop * properties;
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  Uint32 hierarchy_file_offset;
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  Uint32 color;
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  Uint32 opacity;
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  int selection;
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  int visible;
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} xcf_channel;
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typedef struct {
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  Uint32 width;
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  Uint32 height;
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  Uint32 bpp;
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  Uint32 * level_file_offsets;
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} xcf_hierarchy;
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typedef struct {
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  Uint32 width;
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  Uint32 height;
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  Uint32 * tile_file_offsets;
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} xcf_level;
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typedef unsigned char * xcf_tile;
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typedef unsigned char * (* load_tile_type) (SDL_RWops *, Uint32, int, int, int);
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/* See if an image is contained in a data source */
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int IMG_isXCF(SDL_RWops *src)
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{
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    Sint64 start;
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    int is_XCF;
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    char magic[14];
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    if ( !src )
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        return 0;
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    start = SDL_RWtell(src);
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    is_XCF = 0;
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    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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        }
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    }
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    SDL_RWseek(src, start, RW_SEEK_SET);
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    return(is_XCF);
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}
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static char * read_string (SDL_RWops * src) {
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  Uint32 tmp;
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  char * data;
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  tmp = SDL_ReadBE32 (src);
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  if (tmp > 0) {
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    data = (char *) SDL_malloc (sizeof (char) * tmp);
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    SDL_RWread (src, data, tmp, 1);
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  }
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  else {
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    data = NULL;
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  }
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  return data;
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}
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static Uint32 Swap32 (Uint32 v) {
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  return
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    ((v & 0x000000FF) << 16)
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    |  ((v & 0x0000FF00))
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    |  ((v & 0x00FF0000) >> 16)
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    |  ((v & 0xFF000000));
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}
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static void xcf_read_property (SDL_RWops * src, xcf_prop * prop) {
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  prop->id = SDL_ReadBE32 (src);
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  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) {
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  case PROP_COLORMAP:
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    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);
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    break;
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  case PROP_OFFSETS:
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    prop->data.offset.x = SDL_ReadBE32 (src);
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    prop->data.offset.y = SDL_ReadBE32 (src);
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    break;
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  case PROP_OPACITY:
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    prop->data.opacity = SDL_ReadBE32 (src);
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    break;
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  case PROP_COMPRESSION:
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  case PROP_COLOR:
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    SDL_RWread (src, &prop->data, prop->length, 1);
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    break;
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  case PROP_VISIBLE:
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    prop->data.visible = SDL_ReadBE32 (src);
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    break;
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  default:
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    //    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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}
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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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  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;
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  xcf_prop prop;
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  h = (xcf_header *) SDL_malloc (sizeof (xcf_header));
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  SDL_RWread (src, h->sign, 14, 1);
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  h->width       = SDL_ReadBE32 (src);
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  h->height      = SDL_ReadBE32 (src);
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  h->image_type  = SDL_ReadBE32 (src);
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  h->properties = NULL;
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  h->compr      = COMPR_NONE;
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  h->cm_num = 0;
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  h->cm_map = NULL;
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  // Just read, don't save
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  do {
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    xcf_read_property (src, &prop);
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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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      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);
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      SDL_free (prop.data.colormap.cmap);
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    }
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  } while (prop.id != PROP_END);
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  return h;
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}
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static void free_xcf_layer (xcf_layer * l) {
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  SDL_free (l->name);
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  SDL_free (l);
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}
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static xcf_layer * read_xcf_layer (SDL_RWops * src) {
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  xcf_layer * l;
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  xcf_prop    prop;
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  l = (xcf_layer *) SDL_malloc (sizeof (xcf_layer));
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  l->width  = SDL_ReadBE32 (src);
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  l->height = SDL_ReadBE32 (src);
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  l->layer_type = SDL_ReadBE32 (src);
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  l->name = read_string (src);
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  do {
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    xcf_read_property (src, &prop);
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    if (prop.id == PROP_OFFSETS) {
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      l->offset_x = prop.data.offset.x;
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      l->offset_y = prop.data.offset.y;
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    } else if (prop.id == PROP_VISIBLE) {
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      l->visible = prop.data.visible ? 1 : 0;
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    }
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  } while (prop.id != PROP_END);
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  l->hierarchy_file_offset = SDL_ReadBE32 (src);
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  l->layer_mask_offset     = SDL_ReadBE32 (src);
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  return l;
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}
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static void free_xcf_channel (xcf_channel * c) {
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  SDL_free (c->name);
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  SDL_free (c);
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}
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static xcf_channel * read_xcf_channel (SDL_RWops * src) {
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  xcf_channel * l;
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  xcf_prop    prop;
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  l = (xcf_channel *) SDL_malloc (sizeof (xcf_channel));
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  l->width  = SDL_ReadBE32 (src);
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  l->height = SDL_ReadBE32 (src);
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  l->name = read_string (src);
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  l->selection = 0;
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  do {
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    xcf_read_property (src, &prop);
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    switch (prop.id) {
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    case PROP_OPACITY:
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      l->opacity = prop.data.opacity << 24;
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      break;
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    case PROP_COLOR:
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      l->color = ((Uint32) prop.data.color[0] << 16)
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    | ((Uint32) prop.data.color[1] << 8)
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    | ((Uint32) prop.data.color[2]);
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      break;
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    case PROP_SELECTION:
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      l->selection = 1;
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      break;
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    case PROP_VISIBLE:
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      l->visible = prop.data.visible ? 1 : 0;
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      break;
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    default:
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        ;
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    }
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  } while (prop.id != PROP_END);
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  l->hierarchy_file_offset = SDL_ReadBE32 (src);
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  return l;
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}
slouken@26
   402
slouken@204
   403
static void free_xcf_hierarchy (xcf_hierarchy * h) {
slouken@367
   404
  SDL_free (h->level_file_offsets);
slouken@367
   405
  SDL_free (h);
slouken@26
   406
}
slouken@26
   407
slouken@204
   408
static xcf_hierarchy * read_xcf_hierarchy (SDL_RWops * src) {
slouken@26
   409
  xcf_hierarchy * h;
slouken@26
   410
  int i;
slouken@26
   411
slouken@367
   412
  h = (xcf_hierarchy *) SDL_malloc (sizeof (xcf_hierarchy));
slouken@26
   413
  h->width  = SDL_ReadBE32 (src);
slouken@26
   414
  h->height = SDL_ReadBE32 (src);
slouken@26
   415
  h->bpp    = SDL_ReadBE32 (src);
slouken@26
   416
slouken@26
   417
  h->level_file_offsets = NULL;
slouken@26
   418
  i = 0;
slouken@26
   419
  do {
slouken@26
   420
    h->level_file_offsets = (Uint32 *) realloc (h->level_file_offsets, sizeof (Uint32) * (i+1));
slouken@26
   421
    h->level_file_offsets [i] = SDL_ReadBE32 (src);
slouken@26
   422
  } while (h->level_file_offsets [i++]);
slouken@26
   423
slouken@26
   424
  return h;
slouken@26
   425
}
slouken@26
   426
slouken@204
   427
static void free_xcf_level (xcf_level * l) {
slouken@367
   428
  SDL_free (l->tile_file_offsets);
slouken@367
   429
  SDL_free (l);
slouken@26
   430
}
slouken@26
   431
slouken@204
   432
static xcf_level * read_xcf_level (SDL_RWops * src) {
slouken@26
   433
  xcf_level * l;
slouken@26
   434
  int i;
slouken@26
   435
aschiffler@343
   436
  l = (xcf_level *) SDL_malloc (sizeof (xcf_level));
slouken@26
   437
  l->width  = SDL_ReadBE32 (src);
slouken@26
   438
  l->height = SDL_ReadBE32 (src);
slouken@26
   439
slouken@26
   440
  l->tile_file_offsets = NULL;
slouken@26
   441
  i = 0;
slouken@26
   442
  do {
aschiffler@343
   443
    l->tile_file_offsets = (Uint32 *) SDL_realloc (l->tile_file_offsets, sizeof (Uint32) * (i+1));
slouken@26
   444
    l->tile_file_offsets [i] = SDL_ReadBE32 (src);
slouken@26
   445
  } while (l->tile_file_offsets [i++]);
slouken@26
   446
slouken@26
   447
  return l;
slouken@26
   448
}
slouken@26
   449
slouken@204
   450
static void free_xcf_tile (unsigned char * t) {
slouken@367
   451
  SDL_free (t);
slouken@26
   452
}
slouken@26
   453
slouken@204
   454
static unsigned char * load_xcf_tile_none (SDL_RWops * src, Uint32 len, int bpp, int x, int y) {
slouken@26
   455
  unsigned char * load;
slouken@26
   456
aschiffler@343
   457
  load = (unsigned char *) SDL_malloc (len); // expect this is okay
slouken@26
   458
  SDL_RWread (src, load, len, 1);
slouken@26
   459
slouken@26
   460
  return load;
slouken@26
   461
}
slouken@26
   462
slouken@204
   463
static unsigned char * load_xcf_tile_rle (SDL_RWops * src, Uint32 len, int bpp, int x, int y) {
slouken@26
   464
  unsigned char * load, * t, * data, * d;
slouken@26
   465
  Uint32 reallen;
slouken@26
   466
  int i, size, count, j, length;
slouken@26
   467
  unsigned char val;
slouken@26
   468
aschiffler@343
   469
  t = load = (unsigned char *) SDL_malloc (len);
slouken@26
   470
  reallen = SDL_RWread (src, t, 1, len);
slouken@26
   471
slouken@367
   472
  data = (unsigned char *) SDL_malloc (x*y*bpp);
slouken@26
   473
  for (i = 0; i < bpp; i++) {
slouken@26
   474
    d    = data + i;
slouken@26
   475
    size = x*y;
slouken@26
   476
    count = 0;
slouken@368
   477
slouken@26
   478
    while (size > 0) {
slouken@26
   479
      val = *t++;
slouken@26
   480
slouken@26
   481
      length = val;
slouken@26
   482
      if (length >= 128) {
slouken@368
   483
    length = 255 - (length - 1);
slouken@368
   484
    if (length == 128) {
slouken@368
   485
      length = (*t << 8) + t[1];
slouken@368
   486
      t += 2;
slouken@368
   487
    }
slouken@26
   488
slouken@368
   489
    count += length;
slouken@368
   490
    size -= length;
slouken@26
   491
slouken@368
   492
    while (length-- > 0) {
slouken@368
   493
      *d = *t++;
slouken@368
   494
      d += bpp;
slouken@368
   495
    }
slouken@26
   496
      }
slouken@26
   497
      else {
slouken@368
   498
    length += 1;
slouken@368
   499
    if (length == 128) {
slouken@368
   500
      length = (*t << 8) + t[1];
slouken@368
   501
      t += 2;
slouken@368
   502
    }
slouken@26
   503
slouken@368
   504
    count += length;
slouken@368
   505
    size -= length;
slouken@26
   506
slouken@368
   507
    val = *t++;
slouken@26
   508
slouken@368
   509
    for (j = 0; j < length; j++) {
slouken@368
   510
      *d = val;
slouken@368
   511
      d += bpp;
slouken@368
   512
    }
slouken@26
   513
      }
slouken@26
   514
    }
slouken@26
   515
  }
slouken@26
   516
aschiffler@343
   517
  SDL_free (load);
slouken@26
   518
  return (data);
slouken@26
   519
}
slouken@26
   520
slouken@26
   521
static Uint32 rgb2grey (Uint32 a) {
slouken@26
   522
  Uint8 l;
slouken@365
   523
  l = (Uint8)(0.2990 * ((a & 0x00FF0000) >> 16)
slouken@365
   524
    + 0.5870 * ((a & 0x0000FF00) >>  8)
slouken@365
   525
    + 0.1140 * ((a & 0x000000FF)));
slouken@26
   526
slouken@26
   527
  return (l << 16) | (l << 8) | l;
slouken@26
   528
}
slouken@26
   529
slouken@204
   530
static void create_channel_surface (SDL_Surface * surf, xcf_image_type itype, Uint32 color, Uint32 opacity) {
slouken@80
   531
  Uint32 c = 0;
slouken@26
   532
slouken@26
   533
  switch (itype) {
slouken@26
   534
  case IMAGE_RGB:
slouken@26
   535
  case IMAGE_INDEXED:
slouken@26
   536
    c = opacity | color;
slouken@26
   537
    break;
slouken@26
   538
  case IMAGE_GREYSCALE:
slouken@26
   539
    c = opacity | rgb2grey (color);
slouken@26
   540
    break;
slouken@26
   541
  }
slouken@26
   542
  SDL_FillRect (surf, NULL, c);
slouken@26
   543
}
slouken@26
   544
slouken@204
   545
static int do_layer_surface (SDL_Surface * surface, SDL_RWops * src, xcf_header * head, xcf_layer * layer, load_tile_type load_tile) {
slouken@26
   546
  xcf_hierarchy * hierarchy;
slouken@26
   547
  xcf_level     * level;
slouken@26
   548
  unsigned char * tile;
slouken@26
   549
  Uint8  * p8;
slouken@26
   550
  Uint16 * p16;
slouken@26
   551
  Uint32 * p;
aschiffler@343
   552
  int i, j;
aschiffler@343
   553
  Uint32 x, y, tx, ty, ox, oy;
slouken@26
   554
  Uint32 *row;
slouken@26
   555
slouken@236
   556
  SDL_RWseek (src, layer->hierarchy_file_offset, RW_SEEK_SET);
slouken@26
   557
  hierarchy = read_xcf_hierarchy (src);
slouken@26
   558
slouken@26
   559
  level = NULL;
slouken@26
   560
  for (i = 0; hierarchy->level_file_offsets [i]; i++) {
slouken@236
   561
    SDL_RWseek (src, hierarchy->level_file_offsets [i], RW_SEEK_SET);
slouken@26
   562
    level = read_xcf_level (src);
slouken@26
   563
slouken@26
   564
    ty = tx = 0;
slouken@26
   565
    for (j = 0; level->tile_file_offsets [j]; j++) {
slouken@236
   566
      SDL_RWseek (src, level->tile_file_offsets [j], RW_SEEK_SET);
slouken@26
   567
      ox = tx+64 > level->width ? level->width % 64 : 64;
slouken@26
   568
      oy = ty+64 > level->height ? level->height % 64 : 64;
slouken@26
   569
slouken@26
   570
      if (level->tile_file_offsets [j+1]) {
slouken@368
   571
    tile = load_tile
slouken@368
   572
      (src,
slouken@368
   573
       level->tile_file_offsets [j+1] - level->tile_file_offsets [j],
slouken@368
   574
       hierarchy->bpp,
slouken@368
   575
       ox, oy);
slouken@26
   576
      }
slouken@26
   577
      else {
slouken@368
   578
    tile = load_tile
slouken@368
   579
      (src,
slouken@368
   580
       ox*oy*6,
slouken@368
   581
       hierarchy->bpp,
slouken@368
   582
       ox, oy);
slouken@26
   583
      }
slouken@26
   584
slouken@26
   585
      p8  = tile;
slouken@26
   586
      p16 = (Uint16 *) p8;
slouken@26
   587
      p   = (Uint32 *) p8;
slouken@26
   588
      for (y=ty; y < ty+oy; y++) {
slouken@368
   589
    row = (Uint32 *)((Uint8 *)surface->pixels + y*surface->pitch + tx*4);
slouken@368
   590
    switch (hierarchy->bpp) {
slouken@368
   591
    case 4:
slouken@368
   592
      for (x=tx; x < tx+ox; x++)
slouken@368
   593
        *row++ = Swap32 (*p++);
slouken@368
   594
      break;
slouken@368
   595
    case 3:
slouken@368
   596
      for (x=tx; x < tx+ox; x++) {
slouken@368
   597
        *row = 0xFF000000;
slouken@368
   598
        *row |= ((Uint32) *(p8++) << 16);
slouken@368
   599
        *row |= ((Uint32) *(p8++) << 8);
slouken@368
   600
        *row |= ((Uint32) *(p8++) << 0);
slouken@368
   601
        row++;
slouken@368
   602
      }
slouken@368
   603
      break;
slouken@368
   604
    case 2: // Indexed/Greyscale + Alpha
slouken@368
   605
      switch (head->image_type) {
slouken@368
   606
      case IMAGE_INDEXED:
slouken@368
   607
        for (x=tx; x < tx+ox; x++) {
slouken@368
   608
          *row =  ((Uint32) (head->cm_map [*p8*3])     << 16);
slouken@368
   609
          *row |= ((Uint32) (head->cm_map [*p8*3+1])   << 8);
slouken@368
   610
          *row |= ((Uint32) (head->cm_map [*p8++*3+2]) << 0);
slouken@368
   611
          *row |= ((Uint32) *p8++ << 24);;
slouken@368
   612
          row++;
slouken@368
   613
        }
slouken@368
   614
        break;
slouken@368
   615
      case IMAGE_GREYSCALE:
slouken@368
   616
        for (x=tx; x < tx+ox; x++) {
slouken@368
   617
          *row = ((Uint32) *p8 << 16);
slouken@368
   618
          *row |= ((Uint32) *p8 << 8);
slouken@368
   619
          *row |= ((Uint32) *p8++ << 0);
slouken@368
   620
          *row |= ((Uint32) *p8++ << 24);;
slouken@368
   621
          row++;
slouken@368
   622
        }
slouken@368
   623
        break;
slouken@368
   624
      default:
slouken@368
   625
        fprintf (stderr, "Unknown Gimp image type (%d)\n", head->image_type);
slouken@368
   626
        return 1;
slouken@368
   627
      }
slouken@368
   628
      break;
slouken@368
   629
    case 1: // Indexed/Greyscale
slouken@368
   630
      switch (head->image_type) {
slouken@368
   631
      case IMAGE_INDEXED:
slouken@368
   632
        for (x = tx; x < tx+ox; x++) {
slouken@368
   633
          *row++ = 0xFF000000
slouken@368
   634
        | ((Uint32) (head->cm_map [*p8*3]) << 16)
slouken@368
   635
        | ((Uint32) (head->cm_map [*p8*3+1]) << 8)
slouken@368
   636
        | ((Uint32) (head->cm_map [*p8*3+2]) << 0);
slouken@368
   637
          p8++;
slouken@368
   638
        }
slouken@368
   639
        break;
slouken@368
   640
      case IMAGE_GREYSCALE:
slouken@368
   641
        for (x=tx; x < tx+ox; x++) {
slouken@368
   642
          *row++ = 0xFF000000
slouken@368
   643
        | (((Uint32) (*p8)) << 16)
slouken@368
   644
        | (((Uint32) (*p8)) << 8)
slouken@368
   645
        | (((Uint32) (*p8)) << 0);
slouken@368
   646
            ++p8;
slouken@368
   647
        }
slouken@368
   648
        break;
slouken@368
   649
      default:
slouken@368
   650
        fprintf (stderr, "Unknown Gimp image type (%d)\n", head->image_type);
slouken@368
   651
        return 1;
slouken@368
   652
      }
slouken@368
   653
      break;
slouken@368
   654
    }
slouken@26
   655
      }
slouken@26
   656
      tx += 64;
slouken@26
   657
      if (tx >= level->width) {
slouken@368
   658
    tx = 0;
slouken@368
   659
    ty += 64;
slouken@26
   660
      }
slouken@26
   661
      if (ty >= level->height) {
slouken@368
   662
    break;
slouken@26
   663
      }
slouken@26
   664
slouken@26
   665
      free_xcf_tile (tile);
slouken@26
   666
    }
slouken@26
   667
    free_xcf_level (level);
slouken@26
   668
  }
slouken@26
   669
slouken@26
   670
  free_xcf_hierarchy (hierarchy);
slouken@368
   671
slouken@80
   672
  return 0;
slouken@26
   673
}
slouken@26
   674
slouken@118
   675
SDL_Surface *IMG_LoadXCF_RW(SDL_RWops *src)
slouken@118
   676
{
aschiffler@343
   677
  Sint64 start;
slouken@118
   678
  const char *error = NULL;
slouken@26
   679
  SDL_Surface *surface, *lays;
slouken@26
   680
  xcf_header * head;
slouken@26
   681
  xcf_layer  * layer;
slouken@26
   682
  xcf_channel ** channel;
slouken@118
   683
  int chnls, i, offsets;
aschiffler@343
   684
  Sint64 offset, fp;
slouken@26
   685
slouken@26
   686
  unsigned char * (* load_tile) (SDL_RWops *, Uint32, int, int, int);
slouken@26
   687
slouken@98
   688
  if ( !src ) {
slouken@98
   689
    /* The error message has been set in SDL_RWFromFile */
slouken@98
   690
    return NULL;
slouken@98
   691
  }
slouken@118
   692
  start = SDL_RWtell(src);
slouken@98
   693
slouken@26
   694
  /* Initialize the data we will clean up when we're done */
slouken@26
   695
  surface = NULL;
slouken@26
   696
slouken@26
   697
  head = read_xcf_header (src);
slouken@26
   698
slouken@26
   699
  switch (head->compr) {
slouken@26
   700
  case COMPR_NONE:
slouken@26
   701
    load_tile = load_xcf_tile_none;
slouken@26
   702
    break;
slouken@26
   703
  case COMPR_RLE:
slouken@26
   704
    load_tile = load_xcf_tile_rle;
slouken@26
   705
    break;
slouken@26
   706
  default:
slouken@26
   707
    fprintf (stderr, "Unsupported Compression.\n");
slouken@26
   708
    free_xcf_header (head);
slouken@26
   709
    return NULL;
slouken@26
   710
  }
slouken@26
   711
slouken@26
   712
  /* Create the surface of the appropriate type */
slouken@320
   713
  surface = SDL_CreateRGBSurface(SDL_SWSURFACE, head->width, head->height, 32,
slouken@368
   714
                 0x00FF0000,0x0000FF00,0x000000FF,0xFF000000);
slouken@26
   715
slouken@26
   716
  if ( surface == NULL ) {
slouken@118
   717
    error = "Out of memory";
slouken@26
   718
    goto done;
slouken@26
   719
  }
slouken@26
   720
slouken@26
   721
  head->layer_file_offsets = NULL;
slouken@26
   722
  offsets = 0;
slouken@26
   723
slouken@82
   724
  while ((offset = SDL_ReadBE32 (src))) {
slouken@26
   725
    head->layer_file_offsets = (Uint32 *) realloc (head->layer_file_offsets, sizeof (Uint32) * (offsets+1));
aschiffler@343
   726
    head->layer_file_offsets [offsets] = (Uint32)offset;
slouken@26
   727
    offsets++;
slouken@26
   728
  }
slouken@26
   729
  fp = SDL_RWtell (src);
slouken@368
   730
slouken@320
   731
  lays = SDL_CreateRGBSurface(SDL_SWSURFACE, head->width, head->height, 32,
slouken@368
   732
              0x00FF0000,0x0000FF00,0x000000FF,0xFF000000);
slouken@26
   733
slouken@26
   734
  if ( lays == NULL ) {
slouken@118
   735
    error = "Out of memory";
slouken@26
   736
    goto done;
slouken@26
   737
  }
slouken@26
   738
slouken@26
   739
  // Blit layers backwards, because Gimp saves them highest first
slouken@26
   740
  for (i = offsets; i > 0; i--) {
slouken@26
   741
    SDL_Rect rs, rd;
slouken@236
   742
    SDL_RWseek (src, head->layer_file_offsets [i-1], RW_SEEK_SET);
slouken@26
   743
slouken@26
   744
    layer = read_xcf_layer (src);
slouken@26
   745
    do_layer_surface (lays, src, head, layer, load_tile);
slouken@26
   746
    rs.x = 0;
slouken@26
   747
    rs.y = 0;
slouken@26
   748
    rs.w = layer->width;
slouken@26
   749
    rs.h = layer->height;
slouken@26
   750
    rd.x = layer->offset_x;
slouken@26
   751
    rd.y = layer->offset_y;
slouken@26
   752
    rd.w = layer->width;
slouken@26
   753
    rd.h = layer->height;
slouken@70
   754
slouken@70
   755
    if (layer->visible)
slouken@70
   756
      SDL_BlitSurface (lays, &rs, surface, &rd);
slouken@26
   757
    free_xcf_layer (layer);
slouken@26
   758
  }
slouken@26
   759
slouken@26
   760
  SDL_FreeSurface (lays);
slouken@26
   761
slouken@236
   762
  SDL_RWseek (src, fp, RW_SEEK_SET);
slouken@26
   763
slouken@26
   764
  // read channels
slouken@26
   765
  channel = NULL;
slouken@26
   766
  chnls   = 0;
slouken@82
   767
  while ((offset = SDL_ReadBE32 (src))) {
aschiffler@343
   768
    channel = (xcf_channel **) SDL_realloc (channel, sizeof (xcf_channel *) * (chnls+1));
slouken@26
   769
    fp = SDL_RWtell (src);
slouken@236
   770
    SDL_RWseek (src, offset, RW_SEEK_SET);
slouken@26
   771
    channel [chnls++] = (read_xcf_channel (src));
slouken@368
   772
    SDL_RWseek (src, fp, RW_SEEK_SET);
slouken@26
   773
  }
slouken@26
   774
slouken@26
   775
  if (chnls) {
slouken@26
   776
    SDL_Surface * chs;
slouken@26
   777
slouken@320
   778
    chs = SDL_CreateRGBSurface(SDL_SWSURFACE, head->width, head->height, 32,
slouken@368
   779
               0x00FF0000,0x0000FF00,0x000000FF,0xFF000000);
slouken@26
   780
slouken@26
   781
    if (chs == NULL) {
slouken@118
   782
      error = "Out of memory";
slouken@26
   783
      goto done;
slouken@26
   784
    }
slouken@26
   785
    for (i = 0; i < chnls; i++) {
slouken@26
   786
      //      printf ("CNLBLT %i\n", i);
slouken@70
   787
      if (!channel [i]->selection && channel [i]->visible) {
slouken@368
   788
    create_channel_surface (chs, (xcf_image_type)head->image_type, channel [i]->color, channel [i]->opacity);
slouken@368
   789
    SDL_BlitSurface (chs, NULL, surface, NULL);
slouken@26
   790
      }
slouken@26
   791
      free_xcf_channel (channel [i]);
slouken@26
   792
    }
slouken@26
   793
slouken@26
   794
    SDL_FreeSurface (chs);
slouken@26
   795
  }
slouken@26
   796
slouken@118
   797
done:
slouken@26
   798
  free_xcf_header (head);
slouken@118
   799
  if ( error ) {
slouken@236
   800
    SDL_RWseek(src, start, RW_SEEK_SET);
slouken@118
   801
    if ( surface ) {
slouken@118
   802
      SDL_FreeSurface(surface);
slouken@118
   803
      surface = NULL;
slouken@118
   804
    }
slouken@118
   805
    IMG_SetError(error);
slouken@26
   806
  }
slouken@26
   807
slouken@26
   808
  return(surface);
slouken@26
   809
}
slouken@26
   810
slouken@26
   811
#else
slouken@26
   812
slouken@26
   813
/* See if an image is contained in a data source */
slouken@26
   814
int IMG_isXCF(SDL_RWops *src)
slouken@26
   815
{
slouken@26
   816
  return(0);
slouken@26
   817
}
slouken@26
   818
slouken@26
   819
/* Load a XCF type image from an SDL datasource */
slouken@26
   820
SDL_Surface *IMG_LoadXCF_RW(SDL_RWops *src)
slouken@26
   821
{
slouken@26
   822
  return(NULL);
slouken@26
   823
}
slouken@26
   824
slouken@26
   825
#endif /* LOAD_XCF */