IMG_xcf.c
author Sam Lantinga <slouken@libsdl.org>
Fri, 03 May 2002 02:10:44 +0000
changeset 70 ef5fe56a0f07
parent 53 96b084473b47
child 80 e793c7a63324
permissions -rw-r--r--
Date: 02 May 2002 04:11:26 +0200
From: Dag-Erling Smorgrav <des@ofug.org>
Subject: SDL_image XCF patch

The attached patch makes the XCF code ignore invisible layers and
channels, and disables the debugging printouts. This makes the XCF
loader quite usable; I think it should be enabled by default.
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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) 1999, 2000, 2001  Sam Lantinga
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    This library is free software; you can redistribute it and/or
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    modify it under the terms of the GNU Library General Public
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    License as published by the Free Software Foundation; either
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    version 2 of the License, or (at your option) any later version.
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    This library is distributed in the hope that it will be useful,
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    but WITHOUT ANY WARRANTY; without even the implied warranty of
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    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
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    Library General Public License for more details.
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    You should have received a copy of the GNU Library General Public
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    License along with this library; if not, write to the Free
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    Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
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    Sam Lantinga
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    slouken@libsdl.org
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*/
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/* $Id$ */
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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 "SDL_image.h"
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#ifdef LOAD_XCF
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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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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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  int is_XCF;
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  char magic[14];
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  is_XCF = 0;
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  if ( SDL_RWread(src, magic, 14, 1) ) {
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    if (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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  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 *) 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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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 0
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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 *) 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, SEEK_CUR);
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  }
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}
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void free_xcf_header (xcf_header * h) {
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  if (h->cm_num)
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    free (h->cm_map);
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  free (h);
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}
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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 *) 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 = prop.data.compression;
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    else if (prop.id == PROP_COLORMAP) {
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      int i;
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      h->cm_num = prop.data.colormap.num;
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      h->cm_map = (char *) malloc (sizeof (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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      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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void free_xcf_layer (xcf_layer * l) {
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  free (l->name);
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  free (l);
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}
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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 *) 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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void free_xcf_channel (xcf_channel * c) {
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  free (c->name);
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  free (c);
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}
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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 *) 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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  } 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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}
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void free_xcf_hierarchy (xcf_hierarchy * h) {
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  free (h->level_file_offsets);
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  free (h);
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}
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xcf_hierarchy * read_xcf_hierarchy (SDL_RWops * src) {
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  xcf_hierarchy * h;
slouken@26
   402
  int i;
slouken@26
   403
slouken@26
   404
  h = (xcf_hierarchy *) malloc (sizeof (xcf_hierarchy));
slouken@26
   405
  h->width  = SDL_ReadBE32 (src);
slouken@26
   406
  h->height = SDL_ReadBE32 (src);
slouken@26
   407
  h->bpp    = SDL_ReadBE32 (src);
slouken@26
   408
slouken@26
   409
  h->level_file_offsets = NULL;
slouken@26
   410
  i = 0;
slouken@26
   411
  do {
slouken@26
   412
    h->level_file_offsets = (Uint32 *) realloc (h->level_file_offsets, sizeof (Uint32) * (i+1));
slouken@26
   413
    h->level_file_offsets [i] = SDL_ReadBE32 (src);
slouken@26
   414
  } while (h->level_file_offsets [i++]);
slouken@26
   415
slouken@26
   416
  return h;
slouken@26
   417
}
slouken@26
   418
slouken@26
   419
void free_xcf_level (xcf_level * l) {
slouken@26
   420
  free (l->tile_file_offsets);
slouken@26
   421
  free (l);
slouken@26
   422
}
slouken@26
   423
slouken@26
   424
xcf_level * read_xcf_level (SDL_RWops * src) {
slouken@26
   425
  xcf_level * l;
slouken@26
   426
  int i;
slouken@26
   427
slouken@26
   428
  l = (xcf_level *) malloc (sizeof (xcf_level));
slouken@26
   429
  l->width  = SDL_ReadBE32 (src);
slouken@26
   430
  l->height = SDL_ReadBE32 (src);
slouken@26
   431
slouken@26
   432
  l->tile_file_offsets = NULL;
slouken@26
   433
  i = 0;
slouken@26
   434
  do {
slouken@26
   435
    l->tile_file_offsets = (Uint32 *) realloc (l->tile_file_offsets, sizeof (Uint32) * (i+1));
slouken@26
   436
    l->tile_file_offsets [i] = SDL_ReadBE32 (src);
slouken@26
   437
  } while (l->tile_file_offsets [i++]);
slouken@26
   438
slouken@26
   439
  return l;
slouken@26
   440
}
slouken@26
   441
slouken@26
   442
void free_xcf_tile (unsigned char * t) {
slouken@26
   443
  free (t);
slouken@26
   444
}
slouken@26
   445
slouken@26
   446
unsigned char * load_xcf_tile_none (SDL_RWops * src, Uint32 len, int bpp, int x, int y) {
slouken@26
   447
  unsigned char * load;
slouken@26
   448
slouken@26
   449
  load = (char *) malloc (len); // expect this is okay
slouken@26
   450
  SDL_RWread (src, load, len, 1);
slouken@26
   451
slouken@26
   452
  return load;
slouken@26
   453
}
slouken@26
   454
slouken@26
   455
unsigned char * load_xcf_tile_rle (SDL_RWops * src, Uint32 len, int bpp, int x, int y) {
slouken@26
   456
  unsigned char * load, * t, * data, * d;
slouken@26
   457
  Uint32 reallen;
slouken@26
   458
  int i, size, count, j, length;
slouken@26
   459
  unsigned char val;
slouken@26
   460
slouken@26
   461
  t = load = (char *) malloc (len);
slouken@26
   462
  reallen = SDL_RWread (src, t, 1, len);
slouken@26
   463
slouken@26
   464
  data = (char *) malloc (x*y*bpp);
slouken@26
   465
  for (i = 0; i < bpp; i++) {
slouken@26
   466
    d    = data + i;
slouken@26
   467
    size = x*y;
slouken@26
   468
    count = 0;
slouken@26
   469
 
slouken@26
   470
    while (size > 0) {
slouken@26
   471
      val = *t++;
slouken@26
   472
slouken@26
   473
      length = val;
slouken@26
   474
      if (length >= 128) {
slouken@26
   475
	length = 255 - (length - 1);
slouken@26
   476
	if (length == 128) {
slouken@26
   477
	  length = (*t << 8) + t[1];
slouken@26
   478
	  t += 2;
slouken@26
   479
	}
slouken@26
   480
slouken@26
   481
	count += length;
slouken@26
   482
	size -= length;
slouken@26
   483
slouken@26
   484
	while (length-- > 0) {
slouken@26
   485
	  *d = *t++;
slouken@26
   486
	  d += bpp;
slouken@26
   487
	}
slouken@26
   488
      }
slouken@26
   489
      else {
slouken@26
   490
	length += 1;
slouken@26
   491
	if (length == 128) {
slouken@26
   492
	  length = (*t << 8) + t[1];
slouken@26
   493
	  t += 2;
slouken@26
   494
	}
slouken@26
   495
slouken@26
   496
	count += length;
slouken@26
   497
	size -= length;
slouken@26
   498
slouken@26
   499
	val = *t++;
slouken@26
   500
slouken@26
   501
	for (j = 0; j < length; j++) {
slouken@26
   502
	  *d = val;
slouken@26
   503
	  d += bpp;
slouken@26
   504
	}
slouken@26
   505
      }
slouken@26
   506
    }
slouken@26
   507
  }
slouken@26
   508
slouken@26
   509
  free (load);
slouken@26
   510
  return (data);
slouken@26
   511
}
slouken@26
   512
slouken@26
   513
static Uint32 rgb2grey (Uint32 a) {
slouken@26
   514
  Uint8 l;
slouken@26
   515
  l = 0.2990 * ((a && 0x00FF0000) >> 16)
slouken@26
   516
    + 0.5870 * ((a && 0x0000FF00) >>  8)
slouken@26
   517
    + 0.1140 * ((a && 0x000000FF));
slouken@26
   518
slouken@26
   519
  return (l << 16) | (l << 8) | l;
slouken@26
   520
}
slouken@26
   521
slouken@26
   522
void create_channel_surface (SDL_Surface * surf, xcf_image_type itype, Uint32 color, Uint32 opacity) {
slouken@26
   523
  Uint32 c;
slouken@26
   524
slouken@26
   525
  switch (itype) {
slouken@26
   526
  case IMAGE_RGB:
slouken@26
   527
  case IMAGE_INDEXED:
slouken@26
   528
    c = opacity | color;
slouken@26
   529
    break;
slouken@26
   530
  case IMAGE_GREYSCALE:
slouken@26
   531
    c = opacity | rgb2grey (color);
slouken@26
   532
    break;
slouken@26
   533
  }
slouken@26
   534
  SDL_FillRect (surf, NULL, c);
slouken@26
   535
}
slouken@26
   536
slouken@26
   537
int do_layer_surface (SDL_Surface * surface, SDL_RWops * src, xcf_header * head, xcf_layer * layer, load_tile_type load_tile) {
slouken@26
   538
  xcf_hierarchy * hierarchy;
slouken@26
   539
  xcf_level     * level;
slouken@26
   540
  unsigned char * tile;
slouken@26
   541
  Uint8  * p8;
slouken@26
   542
  Uint16 * p16;
slouken@26
   543
  Uint32 * p;
slouken@26
   544
  int x, y, tx, ty, ox, oy, width, height, i, j;
slouken@26
   545
  Uint32 *row;
slouken@26
   546
slouken@26
   547
  SDL_RWseek (src, layer->hierarchy_file_offset, SEEK_SET);
slouken@26
   548
  hierarchy = read_xcf_hierarchy (src);
slouken@26
   549
slouken@26
   550
  level = NULL;
slouken@26
   551
  for (i = 0; hierarchy->level_file_offsets [i]; i++) {
slouken@26
   552
    SDL_RWseek (src, hierarchy->level_file_offsets [i], SEEK_SET);
slouken@26
   553
    level = read_xcf_level (src);
slouken@26
   554
slouken@26
   555
    ty = tx = 0;
slouken@26
   556
    for (j = 0; level->tile_file_offsets [j]; j++) {
slouken@26
   557
      SDL_RWseek (src, level->tile_file_offsets [j], SEEK_SET);
slouken@26
   558
      ox = tx+64 > level->width ? level->width % 64 : 64;
slouken@26
   559
      oy = ty+64 > level->height ? level->height % 64 : 64;
slouken@26
   560
slouken@26
   561
      if (level->tile_file_offsets [j+1]) {
slouken@26
   562
	tile = load_tile
slouken@26
   563
	  (src,
slouken@26
   564
	   level->tile_file_offsets [j+1] - level->tile_file_offsets [j],
slouken@26
   565
	   hierarchy->bpp,
slouken@26
   566
	   ox, oy);
slouken@26
   567
      }
slouken@26
   568
      else {
slouken@26
   569
	tile = load_tile
slouken@26
   570
	  (src,
slouken@26
   571
	   ox*oy*6,
slouken@26
   572
	   hierarchy->bpp,
slouken@26
   573
	   ox, oy);
slouken@26
   574
      }
slouken@26
   575
slouken@26
   576
      p8  = tile;
slouken@26
   577
      p16 = (Uint16 *) p8;
slouken@26
   578
      p   = (Uint32 *) p8;
slouken@26
   579
      for (y=ty; y < ty+oy; y++) {
slouken@26
   580
	row = (Uint32 *)((Uint8 *)surface->pixels + y*surface->pitch + tx*4);
slouken@26
   581
	switch (hierarchy->bpp) {
slouken@26
   582
	case 4:
slouken@26
   583
	  for (x=tx; x < tx+ox; x++)
slouken@26
   584
	    *row++ = Swap32 (*p++);
slouken@26
   585
	  break;
slouken@26
   586
	case 3:
slouken@26
   587
	  for (x=tx; x < tx+ox; x++) {
slouken@26
   588
	    *row = 0xFF000000;
slouken@26
   589
	    *row |= ((Uint32) *(p8++) << 16);
slouken@26
   590
	    *row |= ((Uint32) *(p8++) << 8);
slouken@26
   591
	    *row |= ((Uint32) *(p8++) << 0);
slouken@26
   592
	    row++;
slouken@26
   593
	  }
slouken@26
   594
	  break;
slouken@26
   595
	case 2: // Indexed/Greyscale + Alpha
slouken@26
   596
	  switch (head->image_type) {
slouken@26
   597
	  case IMAGE_INDEXED:
slouken@26
   598
	    for (x=tx; x < tx+ox; x++) {
slouken@26
   599
	      *row =  ((Uint32) (head->cm_map [*p8*3])     << 16);
slouken@26
   600
	      *row |= ((Uint32) (head->cm_map [*p8*3+1])   << 8);
slouken@26
   601
	      *row |= ((Uint32) (head->cm_map [*p8++*3+2]) << 0);
slouken@26
   602
	      *row |= ((Uint32) *p8++ << 24);;
slouken@26
   603
	      row++;
slouken@26
   604
	    }
slouken@26
   605
	    break;
slouken@26
   606
	  case IMAGE_GREYSCALE:
slouken@26
   607
	    for (x=tx; x < tx+ox; x++) {
slouken@26
   608
	      *row = ((Uint32) *p8 << 16);
slouken@26
   609
	      *row |= ((Uint32) *p8 << 8);
slouken@26
   610
	      *row |= ((Uint32) *p8++ << 0);
slouken@26
   611
	      *row |= ((Uint32) *p8++ << 24);;
slouken@26
   612
	      row++;
slouken@26
   613
	    }
slouken@26
   614
	    break;	    
slouken@26
   615
	  default:
slouken@26
   616
	    fprintf (stderr, "Unknown Gimp image type (%d)\n", head->image_type);
slouken@26
   617
	    return 1;
slouken@26
   618
	  }
slouken@26
   619
	  break;
slouken@26
   620
	case 1: // Indexed/Greyscale
slouken@26
   621
	  switch (head->image_type) {
slouken@26
   622
	  case IMAGE_INDEXED:
slouken@26
   623
	    for (x = tx; x < tx+ox; x++) {
slouken@26
   624
	      *row++ = 0xFF000000
slouken@26
   625
		| ((Uint32) (head->cm_map [*p8*3]) << 16)
slouken@26
   626
		| ((Uint32) (head->cm_map [*p8*3+1]) << 8)
slouken@26
   627
		| ((Uint32) (head->cm_map [*p8*3+2]) << 0);
slouken@26
   628
	      p8++;
slouken@26
   629
	    }
slouken@26
   630
	    break;
slouken@26
   631
	  case IMAGE_GREYSCALE:
slouken@26
   632
	    for (x=tx; x < tx+ox; x++) {
slouken@26
   633
	      *row++ = 0xFF000000
slouken@26
   634
		| (((Uint32) (*p8)) << 16)
slouken@26
   635
		| (((Uint32) (*p8)) << 8)
slouken@26
   636
		| (((Uint32) (*p8++)) << 0);
slouken@26
   637
	    }
slouken@26
   638
	    break;	    
slouken@26
   639
	  default:
slouken@26
   640
	    fprintf (stderr, "Unknown Gimp image type (%d)\n", head->image_type);
slouken@26
   641
	    return 1;
slouken@26
   642
	  }
slouken@26
   643
	  break;
slouken@26
   644
	}
slouken@26
   645
      }
slouken@26
   646
      tx += 64;
slouken@26
   647
      if (tx >= level->width) {
slouken@26
   648
	tx = 0;
slouken@26
   649
	ty += 64;
slouken@26
   650
      }
slouken@26
   651
      if (ty >= level->height) {
slouken@26
   652
	break;
slouken@26
   653
      }
slouken@26
   654
slouken@26
   655
      free_xcf_tile (tile);
slouken@26
   656
    }
slouken@26
   657
    free_xcf_level (level);
slouken@26
   658
  }
slouken@26
   659
slouken@26
   660
  free_xcf_hierarchy (hierarchy);
slouken@26
   661
}
slouken@26
   662
slouken@26
   663
SDL_Surface *IMG_LoadXCF_RW(SDL_RWops *src) {
slouken@26
   664
  SDL_Surface *surface, *lays;
slouken@26
   665
  xcf_header * head;
slouken@26
   666
  xcf_layer  * layer;
slouken@26
   667
  xcf_channel ** channel;
slouken@26
   668
  int read_error, chnls, i, offsets;
slouken@26
   669
  Uint32 offset, fp;
slouken@26
   670
slouken@26
   671
  unsigned char * (* load_tile) (SDL_RWops *, Uint32, int, int, int);
slouken@26
   672
slouken@26
   673
  /* Initialize the data we will clean up when we're done */
slouken@26
   674
  surface = NULL;
slouken@26
   675
  read_error = 0;
slouken@26
   676
slouken@26
   677
  /* Check to make sure we have something to do */
slouken@26
   678
  if ( ! src ) {
slouken@26
   679
    goto done;
slouken@26
   680
  }
slouken@26
   681
slouken@26
   682
  head = read_xcf_header (src);
slouken@26
   683
slouken@26
   684
  switch (head->compr) {
slouken@26
   685
  case COMPR_NONE:
slouken@26
   686
    load_tile = load_xcf_tile_none;
slouken@26
   687
    break;
slouken@26
   688
  case COMPR_RLE:
slouken@26
   689
    load_tile = load_xcf_tile_rle;
slouken@26
   690
    break;
slouken@26
   691
  default:
slouken@26
   692
    fprintf (stderr, "Unsupported Compression.\n");
slouken@26
   693
    free_xcf_header (head);
slouken@26
   694
    return NULL;
slouken@26
   695
  }
slouken@26
   696
slouken@26
   697
  /* Create the surface of the appropriate type */
slouken@26
   698
  surface = SDL_AllocSurface(SDL_SWSURFACE, head->width, head->height, 32,
slouken@26
   699
			     0x00FF0000,0x0000FF00,0x000000FF,0xFF000000);
slouken@26
   700
slouken@26
   701
  if ( surface == NULL ) {
slouken@26
   702
    IMG_SetError("Out of memory");
slouken@26
   703
    goto done;
slouken@26
   704
  }
slouken@26
   705
slouken@26
   706
  head->layer_file_offsets = NULL;
slouken@26
   707
  offsets = 0;
slouken@26
   708
slouken@26
   709
  while (offset = SDL_ReadBE32 (src)) {
slouken@26
   710
    head->layer_file_offsets = (Uint32 *) realloc (head->layer_file_offsets, sizeof (Uint32) * (offsets+1));
slouken@26
   711
    head->layer_file_offsets [offsets] = offset;
slouken@26
   712
    offsets++;
slouken@26
   713
  }
slouken@26
   714
  fp = SDL_RWtell (src);
slouken@26
   715
 
slouken@26
   716
  lays = SDL_AllocSurface(SDL_SWSURFACE, head->width, head->height, 32,
slouken@26
   717
			  0x00FF0000,0x0000FF00,0x000000FF,0xFF000000);
slouken@26
   718
slouken@26
   719
  if ( lays == NULL ) {
slouken@26
   720
    IMG_SetError("Out of memory");
slouken@26
   721
    goto done;
slouken@26
   722
  }
slouken@26
   723
slouken@26
   724
  // Blit layers backwards, because Gimp saves them highest first
slouken@26
   725
  for (i = offsets; i > 0; i--) {
slouken@26
   726
    SDL_Rect rs, rd;
slouken@26
   727
    SDL_RWseek (src, head->layer_file_offsets [i-1], SEEK_SET);
slouken@26
   728
slouken@26
   729
    layer = read_xcf_layer (src);
slouken@26
   730
    do_layer_surface (lays, src, head, layer, load_tile);
slouken@26
   731
    rs.x = 0;
slouken@26
   732
    rs.y = 0;
slouken@26
   733
    rs.w = layer->width;
slouken@26
   734
    rs.h = layer->height;
slouken@26
   735
    rd.x = layer->offset_x;
slouken@26
   736
    rd.y = layer->offset_y;
slouken@26
   737
    rd.w = layer->width;
slouken@26
   738
    rd.h = layer->height;
slouken@70
   739
slouken@70
   740
    if (layer->visible)
slouken@70
   741
      SDL_BlitSurface (lays, &rs, surface, &rd);
slouken@26
   742
    free_xcf_layer (layer);
slouken@26
   743
  }
slouken@26
   744
slouken@26
   745
  SDL_FreeSurface (lays);
slouken@26
   746
slouken@26
   747
  SDL_RWseek (src, fp, SEEK_SET);
slouken@26
   748
slouken@26
   749
  // read channels
slouken@26
   750
  channel = NULL;
slouken@26
   751
  chnls   = 0;
slouken@26
   752
  while (offset = SDL_ReadBE32 (src)) {
slouken@26
   753
    channel = (xcf_channel **) realloc (channel, sizeof (xcf_channel *) * (chnls+1));
slouken@26
   754
    fp = SDL_RWtell (src);
slouken@26
   755
    SDL_RWseek (src, offset, SEEK_SET);
slouken@26
   756
    channel [chnls++] = (read_xcf_channel (src));
slouken@26
   757
    SDL_RWseek (src, fp, SEEK_SET);    
slouken@26
   758
  }
slouken@26
   759
slouken@26
   760
  if (chnls) {
slouken@26
   761
    SDL_Surface * chs;
slouken@26
   762
slouken@26
   763
    chs = SDL_AllocSurface(SDL_SWSURFACE, head->width, head->height, 32,
slouken@26
   764
			   0x00FF0000,0x0000FF00,0x000000FF,0xFF000000);
slouken@26
   765
slouken@26
   766
    if (chs == NULL) {
slouken@26
   767
      IMG_SetError("Out of memory");
slouken@26
   768
      goto done;
slouken@26
   769
    }
slouken@26
   770
    for (i = 0; i < chnls; i++) {
slouken@26
   771
      //      printf ("CNLBLT %i\n", i);
slouken@70
   772
      if (!channel [i]->selection && channel [i]->visible) {
slouken@26
   773
	create_channel_surface (chs, head->image_type, channel [i]->color, channel [i]->opacity);
slouken@26
   774
	SDL_BlitSurface (chs, NULL, surface, NULL);
slouken@26
   775
      }
slouken@26
   776
      free_xcf_channel (channel [i]);
slouken@26
   777
    }
slouken@26
   778
slouken@26
   779
    SDL_FreeSurface (chs);
slouken@26
   780
  }
slouken@26
   781
slouken@26
   782
 done:
slouken@26
   783
  free_xcf_header (head);
slouken@26
   784
  if ( read_error ) {
slouken@26
   785
    SDL_FreeSurface(surface);
slouken@26
   786
    IMG_SetError("Error reading XCF data");
slouken@26
   787
    surface = NULL;
slouken@26
   788
  }
slouken@26
   789
slouken@26
   790
  return(surface);
slouken@26
   791
}
slouken@26
   792
slouken@26
   793
#else
slouken@26
   794
slouken@26
   795
/* See if an image is contained in a data source */
slouken@26
   796
int IMG_isXCF(SDL_RWops *src)
slouken@26
   797
{
slouken@26
   798
  return(0);
slouken@26
   799
}
slouken@26
   800
slouken@26
   801
/* Load a XCF type image from an SDL datasource */
slouken@26
   802
SDL_Surface *IMG_LoadXCF_RW(SDL_RWops *src)
slouken@26
   803
{
slouken@26
   804
  return(NULL);
slouken@26
   805
}
slouken@26
   806
slouken@26
   807
#endif /* LOAD_XCF */