IMG_xcf.c
author Ryan C. Gordon <icculus@icculus.org>
Sat, 27 Jan 2018 22:50:18 -0500
changeset 562 d0142861559c
parent 561 607436eb1473
child 568 c5f9cbb5d2bb
permissions -rwxr-xr-x
xcf: don't double-free a pointer on bogus data.

free_xcf_hierarchy() frees the same pointer that this code manually frees.
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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) 1997-2017 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 "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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  Uint32 len;
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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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    if (prop->length > sizeof(prop->data)) {
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        len = sizeof(prop->data);
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    } else {
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        len = prop->length;
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    }
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    SDL_RWread(src, &prop->data, len, 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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  if (h->layer_file_offsets)
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    SDL_free (h->layer_file_offsets);
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  SDL_free (h);
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}
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static xcf_header * read_xcf_header (SDL_RWops * src) {
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  xcf_header * h;
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  xcf_prop prop;
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  h = (xcf_header *) SDL_malloc (sizeof (xcf_header));
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  if (!h) {
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    return NULL;
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  }
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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->layer_file_offsets = 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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      Uint32 cm_num;
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      unsigned char *cm_map;
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      cm_num = prop.data.colormap.num;
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      cm_map = (unsigned char *) SDL_realloc(h->cm_map, sizeof (unsigned char) * 3 * cm_num);
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      if (cm_map) {
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        h->cm_num = cm_num;
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        h->cm_map = cm_map;
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        SDL_memcpy (h->cm_map, prop.data.colormap.cmap, 3*sizeof (char)*h->cm_num);
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      }
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      SDL_free (prop.data.colormap.cmap);
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      if (!cm_map) {
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        free_xcf_header(h);
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        return NULL;
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      }
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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:
slouken@26
   400
      l->color = ((Uint32) prop.data.color[0] << 16)
slouken@368
   401
    | ((Uint32) prop.data.color[1] << 8)
slouken@368
   402
    | ((Uint32) prop.data.color[2]);
slouken@26
   403
      break;
slouken@26
   404
    case PROP_SELECTION:
slouken@26
   405
      l->selection = 1;
slouken@26
   406
      break;
slouken@70
   407
    case PROP_VISIBLE:
slouken@70
   408
      l->visible = prop.data.visible ? 1 : 0;
slouken@70
   409
      break;
slouken@26
   410
    default:
slouken@80
   411
        ;
slouken@26
   412
    }
slouken@26
   413
  } while (prop.id != PROP_END);
slouken@26
   414
slouken@26
   415
  l->hierarchy_file_offset = SDL_ReadBE32 (src);
slouken@26
   416
slouken@26
   417
  return l;
slouken@26
   418
}
slouken@26
   419
slouken@204
   420
static void free_xcf_hierarchy (xcf_hierarchy * h) {
slouken@367
   421
  SDL_free (h->level_file_offsets);
slouken@367
   422
  SDL_free (h);
slouken@26
   423
}
slouken@26
   424
slouken@204
   425
static xcf_hierarchy * read_xcf_hierarchy (SDL_RWops * src) {
slouken@26
   426
  xcf_hierarchy * h;
slouken@26
   427
  int i;
slouken@26
   428
slouken@367
   429
  h = (xcf_hierarchy *) SDL_malloc (sizeof (xcf_hierarchy));
slouken@26
   430
  h->width  = SDL_ReadBE32 (src);
slouken@26
   431
  h->height = SDL_ReadBE32 (src);
slouken@26
   432
  h->bpp    = SDL_ReadBE32 (src);
slouken@26
   433
slouken@26
   434
  h->level_file_offsets = NULL;
slouken@26
   435
  i = 0;
slouken@26
   436
  do {
slouken@415
   437
    h->level_file_offsets = (Uint32 *) SDL_realloc (h->level_file_offsets, sizeof (Uint32) * (i+1));
slouken@26
   438
    h->level_file_offsets [i] = SDL_ReadBE32 (src);
slouken@26
   439
  } while (h->level_file_offsets [i++]);
slouken@26
   440
slouken@26
   441
  return h;
slouken@26
   442
}
slouken@26
   443
slouken@204
   444
static void free_xcf_level (xcf_level * l) {
slouken@367
   445
  SDL_free (l->tile_file_offsets);
slouken@367
   446
  SDL_free (l);
slouken@26
   447
}
slouken@26
   448
slouken@204
   449
static xcf_level * read_xcf_level (SDL_RWops * src) {
slouken@26
   450
  xcf_level * l;
slouken@26
   451
  int i;
slouken@26
   452
aschiffler@343
   453
  l = (xcf_level *) SDL_malloc (sizeof (xcf_level));
slouken@26
   454
  l->width  = SDL_ReadBE32 (src);
slouken@26
   455
  l->height = SDL_ReadBE32 (src);
slouken@26
   456
slouken@26
   457
  l->tile_file_offsets = NULL;
slouken@26
   458
  i = 0;
slouken@26
   459
  do {
aschiffler@343
   460
    l->tile_file_offsets = (Uint32 *) SDL_realloc (l->tile_file_offsets, sizeof (Uint32) * (i+1));
slouken@26
   461
    l->tile_file_offsets [i] = SDL_ReadBE32 (src);
slouken@26
   462
  } while (l->tile_file_offsets [i++]);
slouken@26
   463
slouken@26
   464
  return l;
slouken@26
   465
}
slouken@26
   466
slouken@204
   467
static void free_xcf_tile (unsigned char * t) {
slouken@367
   468
  SDL_free (t);
slouken@26
   469
}
slouken@26
   470
slouken@204
   471
static unsigned char * load_xcf_tile_none (SDL_RWops * src, Uint32 len, int bpp, int x, int y) {
slouken@26
   472
  unsigned char * load;
slouken@26
   473
aschiffler@343
   474
  load = (unsigned char *) SDL_malloc (len); // expect this is okay
slouken@26
   475
  SDL_RWread (src, load, len, 1);
slouken@26
   476
slouken@26
   477
  return load;
slouken@26
   478
}
slouken@26
   479
slouken@204
   480
static unsigned char * load_xcf_tile_rle (SDL_RWops * src, Uint32 len, int bpp, int x, int y) {
slouken@26
   481
  unsigned char * load, * t, * data, * d;
slouken@26
   482
  Uint32 reallen;
slouken@26
   483
  int i, size, count, j, length;
slouken@26
   484
  unsigned char val;
slouken@26
   485
aschiffler@343
   486
  t = load = (unsigned char *) SDL_malloc (len);
slouken@26
   487
  reallen = SDL_RWread (src, t, 1, len);
slouken@26
   488
icculus@560
   489
  data = (unsigned char *) SDL_calloc (1, x*y*bpp);
slouken@26
   490
  for (i = 0; i < bpp; i++) {
slouken@26
   491
    d    = data + i;
slouken@26
   492
    size = x*y;
slouken@26
   493
    count = 0;
slouken@368
   494
slouken@26
   495
    while (size > 0) {
slouken@26
   496
      val = *t++;
slouken@26
   497
slouken@26
   498
      length = val;
slouken@26
   499
      if (length >= 128) {
icculus@561
   500
        length = 255 - (length - 1);
icculus@561
   501
        if (length == 128) {
icculus@561
   502
          length = (*t << 8) + t[1];
icculus@561
   503
          t += 2;
icculus@561
   504
        }
slouken@26
   505
icculus@560
   506
        if (((size_t) (t - load) + length) >= len) {
icculus@560
   507
          break;  /* bogus data */
icculus@560
   508
        } else if (length > size) {
icculus@560
   509
          break;  /* bogus data */
icculus@560
   510
        }
icculus@560
   511
icculus@561
   512
        count += length;
icculus@561
   513
        size -= length;
slouken@26
   514
icculus@561
   515
        while (length-- > 0) {
icculus@561
   516
          *d = *t++;
icculus@561
   517
          d += bpp;
icculus@561
   518
        }
icculus@561
   519
      } else {
icculus@561
   520
        length += 1;
icculus@561
   521
        if (length == 128) {
icculus@561
   522
          length = (*t << 8) + t[1];
icculus@561
   523
          t += 2;
icculus@561
   524
        }
slouken@26
   525
icculus@560
   526
        if (((size_t) (t - load)) >= len) {
icculus@560
   527
          break;  /* bogus data */
icculus@560
   528
        } else if (length > size) {
icculus@560
   529
          break;  /* bogus data */
icculus@560
   530
        }
icculus@560
   531
icculus@561
   532
        count += length;
icculus@561
   533
        size -= length;
slouken@26
   534
icculus@561
   535
        val = *t++;
slouken@26
   536
icculus@561
   537
        for (j = 0; j < length; j++) {
icculus@561
   538
          *d = val;
icculus@561
   539
          d += bpp;
icculus@561
   540
        }
slouken@26
   541
      }
slouken@26
   542
    }
icculus@560
   543
icculus@560
   544
    if (size > 0) {
icculus@560
   545
      break;  /* just drop out, untouched data initialized to zero. */
icculus@560
   546
    }
icculus@560
   547
slouken@26
   548
  }
slouken@26
   549
aschiffler@343
   550
  SDL_free (load);
slouken@26
   551
  return (data);
slouken@26
   552
}
slouken@26
   553
slouken@26
   554
static Uint32 rgb2grey (Uint32 a) {
slouken@26
   555
  Uint8 l;
slouken@365
   556
  l = (Uint8)(0.2990 * ((a & 0x00FF0000) >> 16)
slouken@365
   557
    + 0.5870 * ((a & 0x0000FF00) >>  8)
slouken@365
   558
    + 0.1140 * ((a & 0x000000FF)));
slouken@26
   559
slouken@26
   560
  return (l << 16) | (l << 8) | l;
slouken@26
   561
}
slouken@26
   562
slouken@204
   563
static void create_channel_surface (SDL_Surface * surf, xcf_image_type itype, Uint32 color, Uint32 opacity) {
slouken@80
   564
  Uint32 c = 0;
slouken@26
   565
slouken@26
   566
  switch (itype) {
slouken@26
   567
  case IMAGE_RGB:
slouken@26
   568
  case IMAGE_INDEXED:
slouken@26
   569
    c = opacity | color;
slouken@26
   570
    break;
slouken@26
   571
  case IMAGE_GREYSCALE:
slouken@26
   572
    c = opacity | rgb2grey (color);
slouken@26
   573
    break;
slouken@26
   574
  }
slouken@26
   575
  SDL_FillRect (surf, NULL, c);
slouken@26
   576
}
slouken@26
   577
slouken@499
   578
static int 
slouken@499
   579
do_layer_surface(SDL_Surface * surface, SDL_RWops * src, xcf_header * head, xcf_layer * layer, load_tile_type load_tile)
slouken@499
   580
{
slouken@499
   581
    xcf_hierarchy  *hierarchy;
slouken@499
   582
    xcf_level      *level;
slouken@499
   583
    unsigned char  *tile;
slouken@499
   584
    Uint8          *p8;
slouken@499
   585
    Uint16         *p16;
slouken@499
   586
    Uint32         *p;
slouken@499
   587
    int            i, j;
slouken@499
   588
    Uint32         x, y, tx, ty, ox, oy;
slouken@499
   589
    Uint32         *row;
slouken@26
   590
slouken@499
   591
    SDL_RWseek(src, layer->hierarchy_file_offset, RW_SEEK_SET);
slouken@499
   592
    hierarchy = read_xcf_hierarchy(src);
slouken@26
   593
slouken@499
   594
    level = NULL;
slouken@499
   595
    for (i = 0; hierarchy->level_file_offsets[i]; i++) {
slouken@499
   596
        SDL_RWseek(src, hierarchy->level_file_offsets[i], RW_SEEK_SET);
slouken@499
   597
        level = read_xcf_level(src);
slouken@26
   598
slouken@499
   599
        ty = tx = 0;
slouken@499
   600
        for (j = 0; level->tile_file_offsets[j]; j++) {
slouken@499
   601
            SDL_RWseek(src, level->tile_file_offsets[j], RW_SEEK_SET);
slouken@499
   602
            ox = tx + 64 > level->width ? level->width % 64 : 64;
slouken@499
   603
            oy = ty + 64 > level->height ? level->height % 64 : 64;
slouken@26
   604
slouken@499
   605
            if (level->tile_file_offsets[j + 1]) {
slouken@499
   606
                tile = load_tile(src, level->tile_file_offsets[j + 1] - level->tile_file_offsets[j], hierarchy->bpp, ox, oy);
slouken@499
   607
            } else {
slouken@499
   608
                tile = load_tile(src, ox * oy * 6, hierarchy->bpp, ox, oy);
slouken@499
   609
            }
slouken@26
   610
slouken@499
   611
            p8 = tile;
slouken@499
   612
            p16 = (Uint16 *) p8;
slouken@499
   613
            p = (Uint32 *) p8;
slouken@499
   614
            for (y = ty; y < ty + oy; y++) {
slouken@499
   615
                row = (Uint32 *) ((Uint8 *) surface->pixels + y * surface->pitch + tx * 4);
slouken@499
   616
                switch (hierarchy->bpp) {
slouken@499
   617
                case 4:
slouken@499
   618
                    for (x = tx; x < tx + ox; x++)
slouken@499
   619
                        *row++ = Swap32(*p++);
slouken@499
   620
                    break;
slouken@499
   621
                case 3:
slouken@499
   622
                    for (x = tx; x < tx + ox; x++) {
slouken@499
   623
                        *row = 0xFF000000;
slouken@499
   624
                        *row |= ((Uint32)*p8++ << 16);
slouken@499
   625
                        *row |= ((Uint32)*p8++ << 8);
slouken@499
   626
                        *row |= ((Uint32)*p8++ << 0);
slouken@499
   627
                        row++;
slouken@499
   628
                    }
slouken@499
   629
                    break;
slouken@499
   630
                case 2:
slouken@499
   631
                    /* Indexed / Greyscale + Alpha */
slouken@499
   632
                    switch (head->image_type) {
slouken@499
   633
                    case IMAGE_INDEXED:
slouken@499
   634
                        for (x = tx; x < tx + ox; x++) {
slouken@499
   635
                            *row = ((Uint32)(head->cm_map[*p8 * 3]) << 16);
slouken@499
   636
                            *row |= ((Uint32)(head->cm_map[*p8 * 3 + 1]) << 8);
slouken@499
   637
                            *row |= ((Uint32)(head->cm_map[*p8++ * 3 + 2]) << 0);
slouken@499
   638
                            *row |= ((Uint32)*p8++ << 24);
slouken@499
   639
                            row++;
slouken@499
   640
                        }
slouken@499
   641
                        break;
slouken@499
   642
                    case IMAGE_GREYSCALE:
slouken@499
   643
                        for (x = tx; x < tx + ox; x++) {
slouken@499
   644
                            *row = ((Uint32)*p8 << 16);
slouken@499
   645
                            *row |= ((Uint32)*p8 << 8);
slouken@499
   646
                            *row |= ((Uint32)*p8++ << 0);
slouken@499
   647
                            *row |= ((Uint32)*p8++ << 24);
slouken@499
   648
                            row++;
slouken@499
   649
                        }
slouken@499
   650
                        break;
slouken@499
   651
                    default:
slouken@545
   652
                        SDL_Log("Unknown Gimp image type (%d)\n", head->image_type);
slouken@499
   653
                        if (hierarchy) {
slouken@499
   654
                            free_xcf_hierarchy(hierarchy);
slouken@499
   655
                        }
slouken@499
   656
                        if (level)
slouken@499
   657
                            free_xcf_level(level);
slouken@499
   658
                        return 1;
slouken@499
   659
                    }
slouken@499
   660
                    break;
slouken@499
   661
                case 1:
slouken@499
   662
                    /* Indexed / Greyscale */
slouken@537
   663
                    switch (head->image_type) {
slouken@499
   664
                    case IMAGE_INDEXED:
slouken@499
   665
                        for (x = tx; x < tx + ox; x++) {
slouken@499
   666
                            *row++ = 0xFF000000
slouken@499
   667
                                | ((Uint32)(head->cm_map[*p8 * 3]) << 16)
slouken@499
   668
                                | ((Uint32)(head->cm_map[*p8 * 3 + 1]) << 8)
slouken@499
   669
                                | ((Uint32)(head->cm_map[*p8 * 3 + 2]) << 0);
slouken@499
   670
                            p8++;
slouken@499
   671
                        }
slouken@499
   672
                        break;
slouken@499
   673
                    case IMAGE_GREYSCALE:
slouken@499
   674
                        for (x = tx; x < tx + ox; x++) {
slouken@499
   675
                            *row++ = 0xFF000000
slouken@499
   676
                                | (((Uint32)(*p8)) << 16)
slouken@499
   677
                                | (((Uint32)(*p8)) << 8)
slouken@499
   678
                                | (((Uint32)(*p8)) << 0);
slouken@499
   679
                            ++p8;
slouken@499
   680
                        }
slouken@499
   681
                        break;
slouken@499
   682
                    default:
slouken@545
   683
                        SDL_Log("Unknown Gimp image type (%d)\n", head->image_type);
slouken@499
   684
                        if (tile)
slouken@499
   685
                            free_xcf_tile(tile);
slouken@499
   686
                        if (level)
slouken@499
   687
                            free_xcf_level(level);
slouken@499
   688
                        if (hierarchy)
slouken@499
   689
                            free_xcf_hierarchy(hierarchy);
slouken@499
   690
                        return 1;
slouken@499
   691
                    }
slouken@499
   692
                    break;
slouken@499
   693
                }
slouken@499
   694
            }
slouken@499
   695
            free_xcf_tile(tile);
slouken@499
   696
slouken@499
   697
            tx += 64;
slouken@499
   698
            if (tx >= level->width) {
slouken@499
   699
                tx = 0;
slouken@499
   700
                ty += 64;
slouken@499
   701
            }
slouken@499
   702
            if (ty >= level->height) {
slouken@499
   703
                break;
slouken@499
   704
            }
slouken@368
   705
        }
slouken@499
   706
        free_xcf_level(level);
slouken@368
   707
    }
slouken@26
   708
slouken@499
   709
    free_xcf_hierarchy(hierarchy);
slouken@26
   710
slouken@499
   711
    return 0;
slouken@26
   712
}
slouken@26
   713
slouken@118
   714
SDL_Surface *IMG_LoadXCF_RW(SDL_RWops *src)
slouken@118
   715
{
aschiffler@343
   716
  Sint64 start;
slouken@118
   717
  const char *error = NULL;
slouken@26
   718
  SDL_Surface *surface, *lays;
slouken@26
   719
  xcf_header * head;
slouken@26
   720
  xcf_layer  * layer;
slouken@26
   721
  xcf_channel ** channel;
slouken@118
   722
  int chnls, i, offsets;
aschiffler@343
   723
  Sint64 offset, fp;
slouken@26
   724
slouken@26
   725
  unsigned char * (* load_tile) (SDL_RWops *, Uint32, int, int, int);
slouken@26
   726
slouken@499
   727
  if (!src) {
slouken@98
   728
    /* The error message has been set in SDL_RWFromFile */
slouken@98
   729
    return NULL;
slouken@98
   730
  }
slouken@118
   731
  start = SDL_RWtell(src);
slouken@98
   732
slouken@26
   733
  /* Initialize the data we will clean up when we're done */
slouken@26
   734
  surface = NULL;
slouken@26
   735
slouken@499
   736
  head = read_xcf_header(src);
slouken@499
   737
  if (!head) {
slouken@499
   738
    return NULL;
slouken@499
   739
  }
slouken@26
   740
slouken@26
   741
  switch (head->compr) {
slouken@26
   742
  case COMPR_NONE:
slouken@26
   743
    load_tile = load_xcf_tile_none;
slouken@26
   744
    break;
slouken@26
   745
  case COMPR_RLE:
slouken@26
   746
    load_tile = load_xcf_tile_rle;
slouken@26
   747
    break;
slouken@26
   748
  default:
slouken@545
   749
    SDL_Log("Unsupported Compression.\n");
slouken@26
   750
    free_xcf_header (head);
slouken@26
   751
    return NULL;
slouken@26
   752
  }
slouken@26
   753
slouken@26
   754
  /* Create the surface of the appropriate type */
slouken@320
   755
  surface = SDL_CreateRGBSurface(SDL_SWSURFACE, head->width, head->height, 32,
slouken@368
   756
                 0x00FF0000,0x0000FF00,0x000000FF,0xFF000000);
slouken@26
   757
slouken@26
   758
  if ( surface == NULL ) {
slouken@118
   759
    error = "Out of memory";
slouken@26
   760
    goto done;
slouken@26
   761
  }
slouken@26
   762
slouken@26
   763
  offsets = 0;
slouken@26
   764
slouken@82
   765
  while ((offset = SDL_ReadBE32 (src))) {
slouken@415
   766
    head->layer_file_offsets = (Uint32 *) SDL_realloc (head->layer_file_offsets, sizeof (Uint32) * (offsets+1));
aschiffler@343
   767
    head->layer_file_offsets [offsets] = (Uint32)offset;
slouken@26
   768
    offsets++;
slouken@26
   769
  }
slouken@26
   770
  fp = SDL_RWtell (src);
slouken@368
   771
slouken@320
   772
  lays = SDL_CreateRGBSurface(SDL_SWSURFACE, head->width, head->height, 32,
slouken@368
   773
              0x00FF0000,0x0000FF00,0x000000FF,0xFF000000);
slouken@26
   774
slouken@26
   775
  if ( lays == NULL ) {
slouken@118
   776
    error = "Out of memory";
slouken@26
   777
    goto done;
slouken@26
   778
  }
slouken@26
   779
slouken@26
   780
  // Blit layers backwards, because Gimp saves them highest first
slouken@26
   781
  for (i = offsets; i > 0; i--) {
slouken@26
   782
    SDL_Rect rs, rd;
slouken@236
   783
    SDL_RWseek (src, head->layer_file_offsets [i-1], RW_SEEK_SET);
slouken@26
   784
slouken@26
   785
    layer = read_xcf_layer (src);
slouken@26
   786
    do_layer_surface (lays, src, head, layer, load_tile);
slouken@26
   787
    rs.x = 0;
slouken@26
   788
    rs.y = 0;
slouken@26
   789
    rs.w = layer->width;
slouken@26
   790
    rs.h = layer->height;
slouken@26
   791
    rd.x = layer->offset_x;
slouken@26
   792
    rd.y = layer->offset_y;
slouken@26
   793
    rd.w = layer->width;
slouken@26
   794
    rd.h = layer->height;
slouken@70
   795
slouken@70
   796
    if (layer->visible)
slouken@70
   797
      SDL_BlitSurface (lays, &rs, surface, &rd);
slouken@26
   798
    free_xcf_layer (layer);
slouken@26
   799
  }
slouken@26
   800
slouken@26
   801
  SDL_FreeSurface (lays);
slouken@26
   802
slouken@236
   803
  SDL_RWseek (src, fp, RW_SEEK_SET);
slouken@26
   804
slouken@26
   805
  // read channels
slouken@26
   806
  channel = NULL;
slouken@26
   807
  chnls   = 0;
slouken@82
   808
  while ((offset = SDL_ReadBE32 (src))) {
aschiffler@343
   809
    channel = (xcf_channel **) SDL_realloc (channel, sizeof (xcf_channel *) * (chnls+1));
slouken@26
   810
    fp = SDL_RWtell (src);
slouken@236
   811
    SDL_RWseek (src, offset, RW_SEEK_SET);
slouken@26
   812
    channel [chnls++] = (read_xcf_channel (src));
slouken@368
   813
    SDL_RWseek (src, fp, RW_SEEK_SET);
slouken@26
   814
  }
slouken@26
   815
slouken@26
   816
  if (chnls) {
slouken@26
   817
    SDL_Surface * chs;
slouken@26
   818
slouken@320
   819
    chs = SDL_CreateRGBSurface(SDL_SWSURFACE, head->width, head->height, 32,
slouken@368
   820
               0x00FF0000,0x0000FF00,0x000000FF,0xFF000000);
slouken@26
   821
slouken@26
   822
    if (chs == NULL) {
slouken@118
   823
      error = "Out of memory";
slouken@26
   824
      goto done;
slouken@26
   825
    }
slouken@26
   826
    for (i = 0; i < chnls; i++) {
slouken@26
   827
      //      printf ("CNLBLT %i\n", i);
slouken@70
   828
      if (!channel [i]->selection && channel [i]->visible) {
slouken@368
   829
    create_channel_surface (chs, (xcf_image_type)head->image_type, channel [i]->color, channel [i]->opacity);
slouken@368
   830
    SDL_BlitSurface (chs, NULL, surface, NULL);
slouken@26
   831
      }
slouken@26
   832
      free_xcf_channel (channel [i]);
slouken@26
   833
    }
slouken@26
   834
slouken@26
   835
    SDL_FreeSurface (chs);
slouken@26
   836
  }
slouken@26
   837
slouken@118
   838
done:
slouken@26
   839
  free_xcf_header (head);
slouken@118
   840
  if ( error ) {
slouken@236
   841
    SDL_RWseek(src, start, RW_SEEK_SET);
slouken@118
   842
    if ( surface ) {
slouken@118
   843
      SDL_FreeSurface(surface);
slouken@118
   844
      surface = NULL;
slouken@118
   845
    }
slouken@451
   846
    IMG_SetError("%s", error);
slouken@26
   847
  }
slouken@26
   848
slouken@26
   849
  return(surface);
slouken@26
   850
}
slouken@26
   851
slouken@26
   852
#else
slouken@26
   853
slouken@26
   854
/* See if an image is contained in a data source */
slouken@26
   855
int IMG_isXCF(SDL_RWops *src)
slouken@26
   856
{
slouken@26
   857
  return(0);
slouken@26
   858
}
slouken@26
   859
slouken@26
   860
/* Load a XCF type image from an SDL datasource */
slouken@26
   861
SDL_Surface *IMG_LoadXCF_RW(SDL_RWops *src)
slouken@26
   862
{
slouken@26
   863
  return(NULL);
slouken@26
   864
}
slouken@26
   865
slouken@26
   866
#endif /* LOAD_XCF */