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ddsread.c
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ddsread.c
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/*
DDS GIMP plugin
Copyright (C) 2004-2012 Shawn Kirst <[email protected]>,
with parts (C) 2003 Arne Reuter <[email protected]> where specified.
This program is free software; you can redistribute it and/or
modify it under the terms of the GNU General Public
License as published by the Free Software Foundation; either
version 2 of the License, or (at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; see the file COPYING. If not, write to
the Free Software Foundation, 51 Franklin Street, Fifth Floor
Boston, MA 02110-1301, USA.
*/
/*
** !!! COPYRIGHT NOTICE !!!
**
** The following is based on code (C) 2003 Arne Reuter <[email protected]>
** URL: http://www.dr-reuter.de/arne/dds.html
**
*/
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <gtk/gtk.h>
#include <glib/gstdio.h>
#include <libgimp/gimp.h>
#include <libgimp/gimpui.h>
#include "ddsplugin.h"
#include "dds.h"
#include "dxt.h"
#include "endian.h"
#include "misc.h"
#include "imath.h"
typedef struct
{
unsigned char rshift, gshift, bshift, ashift;
unsigned char rbits, gbits, bbits, abits;
unsigned int rmask, gmask, bmask, amask;
unsigned int bpp, gimp_bpp;
int tile_height;
unsigned char *palette;
} dds_load_info_t;
static int read_header(dds_header_t *hdr, FILE *fp);
static int read_header_dx10(dds_header_dx10_t *hdr, FILE *fp);
static int validate_header(dds_header_t *hdr);
static int setup_dxgi_format(dds_header_t *hdr, dds_header_dx10_t *dx10hdr);
static int load_layer(FILE *fp, dds_header_t *hdr, dds_load_info_t *d,
gint32 image, unsigned int level, char *prefix,
unsigned int *l, guchar *pixels, unsigned char *buf);
static int load_mipmaps(FILE *fp, dds_header_t *hdr, dds_load_info_t *d,
gint32 image, char *prefix, unsigned int *l,
guchar *pixels, unsigned char *buf);
static int load_face(FILE *fp, dds_header_t *hdr, dds_load_info_t *d,
gint32 image, char *prefix, unsigned int *l,
guchar *pixels, unsigned char *buf);
static unsigned char color_bits(unsigned int mask);
static unsigned char color_shift(unsigned int mask);
static int load_dialog(void);
static int runme = 0;
GimpPDBStatusType read_dds(gchar *filename, gint32 *imageID)
{
gint32 image = 0;
unsigned char *buf;
unsigned int l = 0;
guchar *pixels;
gchar *tmp;
FILE *fp;
dds_header_t hdr;
dds_header_dx10_t dx10hdr;
dds_load_info_t d;
gint *layers, layer_count;
GimpImageBaseType type;
int i, j;
if(interactive_dds && dds_read_vals.show_dialog)
{
if(!load_dialog())
return(GIMP_PDB_CANCEL);
}
fp = g_fopen(filename, "rb");
if(fp == 0)
{
g_message("Error opening file.\n");
return(GIMP_PDB_EXECUTION_ERROR);
}
if(strrchr(filename, '/'))
tmp = g_strdup_printf("Loading %s:", strrchr(filename, '/') + 1);
else
tmp = g_strdup_printf("Loading %s:", filename);
gimp_progress_init(tmp);
g_free(tmp);
/* read header */
read_header(&hdr, fp);
memset(&dx10hdr, 0, sizeof(dds_header_dx10_t));
/* read DX10 header if necessary */
if(GETL32(hdr.pixelfmt.fourcc) == FOURCC('D','X','1','0'))
{
read_header_dx10(&dx10hdr, fp);
if(!setup_dxgi_format(&hdr, &dx10hdr))
{
fclose(fp);
return(GIMP_PDB_EXECUTION_ERROR);
}
}
if(!validate_header(&hdr))
{
fclose(fp);
g_message("Invalid DDS header!\n");
return(GIMP_PDB_EXECUTION_ERROR);
}
/* a lot of DDS images out there don't have this for some reason -_- */
if(hdr.pitch_or_linsize == 0)
{
if(hdr.pixelfmt.flags & DDPF_FOURCC) /* assume linear size */
{
hdr.pitch_or_linsize = ((hdr.width + 3) >> 2) * ((hdr.height + 3) >> 2);
switch(GETL32(hdr.pixelfmt.fourcc))
{
case FOURCC('D','X','T','1'):
case FOURCC('A','T','I','1'):
case FOURCC('B','C','4','U'):
case FOURCC('B','C','4','S'):
hdr.pitch_or_linsize *= 8;
break;
default:
hdr.pitch_or_linsize *= 16;
break;
}
}
else /* assume pitch */
{
hdr.pitch_or_linsize = hdr.height * hdr.width * (hdr.pixelfmt.bpp >> 3);
}
}
if(hdr.pixelfmt.flags & DDPF_FOURCC)
{
/* fourcc is dXt* or rXgb */
if(hdr.pixelfmt.fourcc[1] == 'X')
hdr.pixelfmt.flags |= DDPF_ALPHAPIXELS;
}
if(hdr.pixelfmt.flags & DDPF_FOURCC)
{
switch(GETL32(hdr.pixelfmt.fourcc))
{
case FOURCC('A','T','I','1'):
case FOURCC('B','C','4','U'):
case FOURCC('B','C','4','S'):
d.bpp = d.gimp_bpp = 1;
type = GIMP_GRAY;
break;
case FOURCC('A','T','I','2'):
case FOURCC('B','C','5','U'):
case FOURCC('B','C','5','S'):
d.bpp = d.gimp_bpp = 3;
type = GIMP_RGB;
break;
default:
d.bpp = d.gimp_bpp = 4;
type = GIMP_RGB;
break;
}
}
else
{
d.bpp = hdr.pixelfmt.bpp >> 3;
if(d.bpp == 2)
{
if(hdr.pixelfmt.amask == 0xf000) // RGBA4
{
d.gimp_bpp = 4;
type = GIMP_RGB;
}
else if(hdr.pixelfmt.amask == 0xff00) //L8A8
{
d.gimp_bpp = 2;
type = GIMP_GRAY;
}
else if(hdr.pixelfmt.bmask == 0x1f) //R5G6B5 or RGB5A1
{
if(hdr.pixelfmt.amask == 0x8000) // RGB5A1
d.gimp_bpp = 4;
else
d.gimp_bpp = 3;
type = GIMP_RGB;
}
else //L16
{
d.gimp_bpp = 1;
type = GIMP_GRAY;
}
}
else
{
if(hdr.pixelfmt.flags & DDPF_PALETTEINDEXED8)
{
type = GIMP_INDEXED;
d.gimp_bpp = 1;
}
else if(hdr.pixelfmt.rmask == 0xe0) // R3G3B2
{
type = GIMP_RGB;
d.gimp_bpp = 3;
}
else
{
/* test alpha only image */
if(d.bpp == 1 && (hdr.pixelfmt.flags & DDPF_ALPHA))
{
d.gimp_bpp = 2;
type = GIMP_GRAY;
}
else
{
d.gimp_bpp = d.bpp;
type = (d.bpp == 1) ? GIMP_GRAY : GIMP_RGB;
}
}
}
}
image = gimp_image_new(hdr.width, hdr.height, type);
if(image == -1)
{
g_message("Can't allocate new image.\n");
fclose(fp);
return(GIMP_PDB_EXECUTION_ERROR);
}
gimp_image_set_filename(image, filename);
if(hdr.pixelfmt.flags & DDPF_PALETTEINDEXED8)
{
d.palette = g_malloc(256 * 4);
if(fread(d.palette, 1, 1024, fp) != 1024)
{
g_message("Error reading palette.\n");
fclose(fp);
gimp_image_delete(image);
return(GIMP_PDB_EXECUTION_ERROR);
}
for(i = j = 0; i < 768; i += 3, j += 4)
{
d.palette[i + 0] = d.palette[j + 0];
d.palette[i + 1] = d.palette[j + 1];
d.palette[i + 2] = d.palette[j + 2];
}
gimp_image_set_colormap(image, d.palette, 256);
}
d.tile_height = gimp_tile_height();
pixels = g_new(guchar, d.tile_height * hdr.width * d.gimp_bpp);
buf = g_malloc(hdr.pitch_or_linsize);
d.rshift = color_shift(hdr.pixelfmt.rmask);
d.gshift = color_shift(hdr.pixelfmt.gmask);
d.bshift = color_shift(hdr.pixelfmt.bmask);
d.ashift = color_shift(hdr.pixelfmt.amask);
d.rbits = color_bits(hdr.pixelfmt.rmask);
d.gbits = color_bits(hdr.pixelfmt.gmask);
d.bbits = color_bits(hdr.pixelfmt.bmask);
d.abits = color_bits(hdr.pixelfmt.amask);
d.rmask = (hdr.pixelfmt.rmask >> d.rshift) << (8 - d.rbits);
d.gmask = (hdr.pixelfmt.gmask >> d.gshift) << (8 - d.gbits);
d.bmask = (hdr.pixelfmt.bmask >> d.bshift) << (8 - d.bbits);
d.amask = (hdr.pixelfmt.amask >> d.ashift) << (8 - d.abits);
if(!(hdr.caps.caps2 & DDSCAPS2_CUBEMAP) &&
!(hdr.caps.caps2 & DDSCAPS2_VOLUME) &&
dx10hdr.arraySize == 0)
{
if(!load_layer(fp, &hdr, &d, image, 0, "", &l, pixels, buf))
{
fclose(fp);
gimp_image_delete(image);
return(GIMP_PDB_EXECUTION_ERROR);
}
if(!load_mipmaps(fp, &hdr, &d, image, "", &l, pixels, buf))
{
fclose(fp);
gimp_image_delete(image);
return(GIMP_PDB_EXECUTION_ERROR);
}
}
else if(hdr.caps.caps2 & DDSCAPS2_CUBEMAP)
{
if((hdr.caps.caps2 & DDSCAPS2_CUBEMAP_POSITIVEX) &&
!load_face(fp, &hdr, &d, image, "(positive x)", &l, pixels, buf))
{
fclose(fp);
gimp_image_delete(image);
return(GIMP_PDB_EXECUTION_ERROR);
}
if((hdr.caps.caps2 & DDSCAPS2_CUBEMAP_NEGATIVEX) &&
!load_face(fp, &hdr, &d, image, "(negative x)", &l, pixels, buf))
{
fclose(fp);
gimp_image_delete(image);
return(GIMP_PDB_EXECUTION_ERROR);
}
if((hdr.caps.caps2 & DDSCAPS2_CUBEMAP_POSITIVEY) &&
!load_face(fp, &hdr, &d, image, "(positive y)", &l, pixels, buf))
{
fclose(fp);
gimp_image_delete(image);
return(GIMP_PDB_EXECUTION_ERROR);
}
if((hdr.caps.caps2 & DDSCAPS2_CUBEMAP_NEGATIVEY) &&
!load_face(fp, &hdr, &d, image, "(negative y)", &l, pixels, buf))
{
fclose(fp);
gimp_image_delete(image);
return(GIMP_PDB_EXECUTION_ERROR);
}
if((hdr.caps.caps2 & DDSCAPS2_CUBEMAP_POSITIVEZ) &&
!load_face(fp, &hdr, &d, image, "(positive z)", &l, pixels, buf))
{
fclose(fp);
gimp_image_delete(image);
return(GIMP_PDB_EXECUTION_ERROR);
}
if((hdr.caps.caps2 & DDSCAPS2_CUBEMAP_NEGATIVEZ) &&
!load_face(fp, &hdr, &d, image, "(negative z)", &l, pixels, buf))
{
fclose(fp);
gimp_image_delete(image);
return(GIMP_PDB_EXECUTION_ERROR);
}
}
else if((hdr.caps.caps2 & DDSCAPS2_VOLUME) &&
(hdr.flags & DDSD_DEPTH))
{
unsigned int i, level;
char *plane;
for(i = 0; i < hdr.depth; ++i)
{
plane = g_strdup_printf("(z = %d)", i);
if(!load_layer(fp, &hdr, &d, image, 0, plane, &l, pixels, buf))
{
g_free(plane);
fclose(fp);
gimp_image_delete(image);
return(GIMP_PDB_EXECUTION_ERROR);
}
g_free(plane);
}
if((hdr.flags & DDSD_MIPMAPCOUNT) &&
(hdr.caps.caps1 & DDSCAPS_MIPMAP) &&
(dds_read_vals.mipmaps != 0))
{
for(level = 1; level < hdr.num_mipmaps; ++level)
{
int n = hdr.depth >> level;
if(n < 1) n = 1;
for(i = 0; i < n; ++i)
{
plane = g_strdup_printf("(z = %d)", i);
if(!load_layer(fp, &hdr, &d, image, level, plane, &l, pixels, buf))
{
g_free(plane);
fclose(fp);
gimp_image_delete(image);
return(GIMP_PDB_EXECUTION_ERROR);
}
g_free(plane);
}
}
}
}
else if(dx10hdr.arraySize > 0)
{
unsigned int i;
char *elem;
for(i = 0; i < dx10hdr.arraySize; ++i)
{
elem = g_strdup_printf("(array element %d)", i);
if(!load_layer(fp, &hdr, &d, image, 0, elem, &l, pixels, buf))
{
fclose(fp);
gimp_image_delete(image);
return(GIMP_PDB_EXECUTION_ERROR);
}
if(!load_mipmaps(fp, &hdr, &d, image, elem, &l, pixels, buf))
{
fclose(fp);
gimp_image_delete(image);
return(GIMP_PDB_EXECUTION_ERROR);
}
g_free(elem);
}
}
gimp_progress_update(1.0);
if(hdr.pixelfmt.flags & DDPF_PALETTEINDEXED8)
g_free(d.palette);
g_free(buf);
g_free(pixels);
fclose(fp);
layers = gimp_image_get_layers(image, &layer_count);
if(layers == NULL || layer_count == 0)
{
g_message("Oops! NULL image read! Please report this!");
return(GIMP_PDB_EXECUTION_ERROR);
}
gimp_image_set_active_layer(image, layers[0]);
*imageID = image;
return(GIMP_PDB_SUCCESS);
}
static int read_header(dds_header_t *hdr, FILE *fp)
{
unsigned char buf[DDS_HEADERSIZE];
memset(hdr, 0, sizeof(dds_header_t));
if(fread(buf, 1, DDS_HEADERSIZE, fp) != DDS_HEADERSIZE)
return(0);
hdr->magic = GETL32(buf);
hdr->size = GETL32(buf + 4);
hdr->flags = GETL32(buf + 8);
hdr->height = GETL32(buf + 12);
hdr->width = GETL32(buf + 16);
hdr->pitch_or_linsize = GETL32(buf + 20);
hdr->depth = GETL32(buf + 24);
hdr->num_mipmaps = GETL32(buf + 28);
hdr->pixelfmt.size = GETL32(buf + 76);
hdr->pixelfmt.flags = GETL32(buf + 80);
hdr->pixelfmt.fourcc[0] = buf[84];
hdr->pixelfmt.fourcc[1] = buf[85];
hdr->pixelfmt.fourcc[2] = buf[86];
hdr->pixelfmt.fourcc[3] = buf[87];
hdr->pixelfmt.bpp = GETL32(buf + 88);
hdr->pixelfmt.rmask = GETL32(buf + 92);
hdr->pixelfmt.gmask = GETL32(buf + 96);
hdr->pixelfmt.bmask = GETL32(buf + 100);
hdr->pixelfmt.amask = GETL32(buf + 104);
hdr->caps.caps1 = GETL32(buf + 108);
hdr->caps.caps2 = GETL32(buf + 112);
/* GIMP-DDS special info */
if(GETL32(buf + 32) == FOURCC('G','I','M','P') &&
GETL32(buf + 36) == FOURCC('-','D','D','S'))
{
hdr->reserved.gimp_dds_special.magic1 = GETL32(buf + 32);
hdr->reserved.gimp_dds_special.magic2 = GETL32(buf + 36);
hdr->reserved.gimp_dds_special.version = GETL32(buf + 40);
hdr->reserved.gimp_dds_special.extra_fourcc = GETL32(buf + 44);
}
return(1);
}
static int read_header_dx10(dds_header_dx10_t *hdr, FILE *fp)
{
char buf[DDS_HEADERSIZE_DX10];
memset(hdr, 0, sizeof(dds_header_dx10_t));
if(fread(buf, 1, DDS_HEADERSIZE_DX10, fp) != DDS_HEADERSIZE_DX10)
return(0);
hdr->dxgiFormat = GETL32(buf);
hdr->resourceDimension = GETL32(buf + 4);
hdr->miscFlag = GETL32(buf + 8);
hdr->arraySize = GETL32(buf + 12);
hdr->reserved = GETL32(buf + 16);
return(1);
}
static int validate_header(dds_header_t *hdr)
{
unsigned int fourcc;
if(hdr->magic != FOURCC('D','D','S',' '))
{
g_message("Invalid DDS file.\n");
return(0);
}
if((hdr->flags & DDSD_PITCH) == (hdr->flags & DDSD_LINEARSIZE))
{
//g_message("Warning: DDSD_PITCH or DDSD_LINEARSIZE is not set.\n");
if(hdr->pixelfmt.flags & DDPF_FOURCC)
hdr->flags |= DDSD_LINEARSIZE;
else
hdr->flags |= DDSD_PITCH;
}
/*
if((hdr->pixelfmt.flags & DDPF_FOURCC) ==
(hdr->pixelfmt.flags & DDPF_RGB))
{
g_message("Invalid pixel format.\n");
return(0);
}
*/
fourcc = GETL32(hdr->pixelfmt.fourcc);
if((hdr->pixelfmt.flags & DDPF_FOURCC) &&
fourcc != FOURCC('D','X','T','1') &&
fourcc != FOURCC('D','X','T','3') &&
fourcc != FOURCC('D','X','T','5') &&
fourcc != FOURCC('R','X','G','B') &&
fourcc != FOURCC('A','T','I','1') &&
fourcc != FOURCC('B','C','4','U') &&
fourcc != FOURCC('B','C','4','S') &&
fourcc != FOURCC('A','T','I','2') &&
fourcc != FOURCC('B','C','5','U') &&
fourcc != FOURCC('B','C','5','S') &&
fourcc != FOURCC('D','X','1','0'))
{
g_message("Unsupported format (FOURCC: %c%c%c%c, hex: %08x).\n",
hdr->pixelfmt.fourcc[0],
hdr->pixelfmt.fourcc[1],
hdr->pixelfmt.fourcc[2],
hdr->pixelfmt.fourcc[3],
GETL32(hdr->pixelfmt.fourcc));
return(0);
}
if(hdr->pixelfmt.flags & DDPF_RGB)
{
if((hdr->pixelfmt.bpp != 8) &&
(hdr->pixelfmt.bpp != 16) &&
(hdr->pixelfmt.bpp != 24) &&
(hdr->pixelfmt.bpp != 32))
{
g_message("Invalid BPP.\n");
return(0);
}
}
else if(hdr->pixelfmt.flags & DDPF_LUMINANCE)
{
if((hdr->pixelfmt.bpp != 8) &&
(hdr->pixelfmt.bpp != 16))
{
g_message("Invalid BPP.\n");
return(0);
}
hdr->pixelfmt.flags |= DDPF_RGB;
}
else if(hdr->pixelfmt.flags & DDPF_PALETTEINDEXED8)
{
hdr->pixelfmt.flags |= DDPF_RGB;
}
if(!(hdr->pixelfmt.flags & DDPF_RGB) &&
!(hdr->pixelfmt.flags & DDPF_ALPHA) &&
!(hdr->pixelfmt.flags & DDPF_FOURCC) &&
!(hdr->pixelfmt.flags & DDPF_LUMINANCE))
{
g_message("Unknown pixel format! Taking a guess, expect trouble!");
switch(fourcc)
{
case FOURCC('D','X','T','1'):
case FOURCC('D','X','T','3'):
case FOURCC('D','X','T','5'):
case FOURCC('R','X','G','B'):
case FOURCC('A','T','I','1'):
case FOURCC('B','C','4','U'):
case FOURCC('B','C','4','S'):
case FOURCC('A','T','I','2'):
case FOURCC('B','C','5','U'):
case FOURCC('B','C','5','S'):
hdr->pixelfmt.flags |= DDPF_FOURCC;
break;
default:
switch(hdr->pixelfmt.bpp)
{
case 8:
if(hdr->pixelfmt.flags & DDPF_ALPHAPIXELS)
hdr->pixelfmt.flags |= DDPF_ALPHA;
else
hdr->pixelfmt.flags |= DDPF_LUMINANCE;
break;
case 16:
case 24:
case 32:
hdr->pixelfmt.flags |= DDPF_RGB;
break;
default:
g_message("Invalid pixel format.");
return(0);
}
break;
}
}
return(1);
}
/*
* This function will set the necessary flags and attributes in the standard
* dds header using the information found in the DX10 header.
*/
static int setup_dxgi_format(dds_header_t *hdr, dds_header_dx10_t *dx10hdr)
{
if((dx10hdr->resourceDimension == D3D10_RESOURCE_DIMENSION_TEXTURE2D) &&
(dx10hdr->miscFlag & D3D10_RESOURCE_MISC_TEXTURECUBE))
{
hdr->caps.caps2 |= DDSCAPS2_CUBEMAP | DDSCAPS2_CUBEMAP_ALL_FACES;
}
else if(dx10hdr->resourceDimension == D3D10_RESOURCE_DIMENSION_TEXTURE3D)
{
hdr->flags |= DDSD_DEPTH;
hdr->caps.caps2 |= DDSCAPS2_VOLUME;
}
if((dx10hdr->resourceDimension != D3D10_RESOURCE_DIMENSION_TEXTURE1D) &&
(dx10hdr->resourceDimension != D3D10_RESOURCE_DIMENSION_TEXTURE2D) &&
(dx10hdr->resourceDimension != D3D10_RESOURCE_DIMENSION_TEXTURE3D))
return(0);
// check for a compressed DXGI format
if((dx10hdr->dxgiFormat >= DXGI_FORMAT_BC1_TYPELESS) &&
(dx10hdr->dxgiFormat <= DXGI_FORMAT_BC5_SNORM))
{
// set flag and replace FOURCC
hdr->pixelfmt.flags |= DDPF_FOURCC;
switch(dx10hdr->dxgiFormat)
{
case DXGI_FORMAT_BC1_TYPELESS:
case DXGI_FORMAT_BC1_UNORM:
case DXGI_FORMAT_BC1_UNORM_SRGB:
PUTL32(hdr->pixelfmt.fourcc, FOURCC('D','X','T','1'));
break;
case DXGI_FORMAT_BC2_TYPELESS:
case DXGI_FORMAT_BC2_UNORM:
case DXGI_FORMAT_BC2_UNORM_SRGB:
PUTL32(hdr->pixelfmt.fourcc, FOURCC('D','X','T','3'));
break;
case DXGI_FORMAT_BC3_TYPELESS:
case DXGI_FORMAT_BC3_UNORM:
case DXGI_FORMAT_BC3_UNORM_SRGB:
PUTL32(hdr->pixelfmt.fourcc, FOURCC('D','X','T','5'));
break;
case DXGI_FORMAT_BC4_TYPELESS:
case DXGI_FORMAT_BC4_UNORM:
PUTL32(hdr->pixelfmt.fourcc, FOURCC('A','T','I','1'));
break;
case DXGI_FORMAT_BC4_SNORM:
PUTL32(hdr->pixelfmt.fourcc, FOURCC('B','C','4','S'));
break;
case DXGI_FORMAT_BC5_TYPELESS:
case DXGI_FORMAT_BC5_UNORM:
PUTL32(hdr->pixelfmt.fourcc, FOURCC('A','T','I','2'));
break;
case DXGI_FORMAT_BC5_SNORM:
PUTL32(hdr->pixelfmt.fourcc, FOURCC('B','C','5','S'));
break;
default:
break;
}
}
else
{
/* unset the FOURCC flag */
hdr->pixelfmt.flags &= ~DDPF_FOURCC;
switch(dx10hdr->dxgiFormat)
{
case DXGI_FORMAT_B8G8R8A8_TYPELESS:
case DXGI_FORMAT_B8G8R8A8_UNORM:
case DXGI_FORMAT_B8G8R8A8_UNORM_SRGB:
hdr->pixelfmt.bpp = 32;
hdr->pixelfmt.flags |= DDPF_ALPHAPIXELS;
hdr->pixelfmt.rmask = 0x00ff0000;
hdr->pixelfmt.gmask = 0x0000ff00;
hdr->pixelfmt.bmask = 0x000000ff;
hdr->pixelfmt.amask = 0xff000000;
break;
case DXGI_FORMAT_B8G8R8X8_TYPELESS:
case DXGI_FORMAT_B8G8R8X8_UNORM:
case DXGI_FORMAT_B8G8R8X8_UNORM_SRGB:
hdr->pixelfmt.bpp = 32;
hdr->pixelfmt.flags |= DDPF_ALPHAPIXELS;
hdr->pixelfmt.rmask = 0x00ff0000;
hdr->pixelfmt.gmask = 0x0000ff00;
hdr->pixelfmt.bmask = 0x000000ff;
hdr->pixelfmt.amask = 0x00000000;
break;
case DXGI_FORMAT_R8G8B8A8_TYPELESS:
case DXGI_FORMAT_R8G8B8A8_UNORM:
case DXGI_FORMAT_R8G8B8A8_UNORM_SRGB:
case DXGI_FORMAT_R8G8B8A8_UINT:
case DXGI_FORMAT_R8G8B8A8_SNORM:
case DXGI_FORMAT_R8G8B8A8_SINT:
hdr->pixelfmt.bpp = 32;
hdr->pixelfmt.flags |= DDPF_ALPHAPIXELS;
hdr->pixelfmt.rmask = 0x000000ff;
hdr->pixelfmt.gmask = 0x0000ff00;
hdr->pixelfmt.bmask = 0x00ff0000;
hdr->pixelfmt.amask = 0xff000000;
break;
case DXGI_FORMAT_B5G6R5_UNORM:
hdr->pixelfmt.bpp = 16;
hdr->pixelfmt.rmask = 0x0000f800;
hdr->pixelfmt.gmask = 0x000007e0;
hdr->pixelfmt.bmask = 0x0000001f;
hdr->pixelfmt.amask = 0x00000000;
break;
case DXGI_FORMAT_B5G5R5A1_UNORM:
hdr->pixelfmt.bpp = 16;
hdr->pixelfmt.rmask = 0x00007c00;
hdr->pixelfmt.gmask = 0x000003e0;
hdr->pixelfmt.bmask = 0x0000001f;
hdr->pixelfmt.amask = 0x00008000;
break;
case DXGI_FORMAT_R10G10B10A2_TYPELESS:
case DXGI_FORMAT_R10G10B10A2_UNORM:
case DXGI_FORMAT_R10G10B10A2_UINT:
hdr->pixelfmt.bpp = 32;
hdr->pixelfmt.flags |= DDPF_ALPHAPIXELS;
hdr->pixelfmt.rmask = 0x000003ff;
hdr->pixelfmt.gmask = 0x000ffc00;
hdr->pixelfmt.bmask = 0x3ff00000;
hdr->pixelfmt.amask = 0xc0000000;
break;
case DXGI_FORMAT_A8_UNORM:
hdr->pixelfmt.bpp = 8;
hdr->pixelfmt.flags |= DDPF_ALPHA | DDPF_ALPHAPIXELS;
hdr->pixelfmt.rmask = hdr->pixelfmt.gmask = hdr->pixelfmt.bmask = 0;
hdr->pixelfmt.amask = 0x000000ff;
break;
case DXGI_FORMAT_R8_TYPELESS:
case DXGI_FORMAT_R8_UNORM:
case DXGI_FORMAT_R8_UINT:
case DXGI_FORMAT_R8_SNORM:
case DXGI_FORMAT_R8_SINT:
hdr->pixelfmt.bpp = 8;
hdr->pixelfmt.rmask = 0x000000ff;
hdr->pixelfmt.gmask = hdr->pixelfmt.bmask = hdr->pixelfmt.amask = 0;
break;
case DXGI_FORMAT_B4G4R4A4_UNORM:
hdr->pixelfmt.bpp = 16;
hdr->pixelfmt.flags |= DDPF_ALPHAPIXELS;
hdr->pixelfmt.rmask = 0x00000f00;
hdr->pixelfmt.gmask = 0x000000f0;
hdr->pixelfmt.bmask = 0x0000000f;
hdr->pixelfmt.amask = 0x0000f000;
break;
case DXGI_FORMAT_UNKNOWN:
g_message("Unknown DXGI format. Expect problems...");
break;
default: /* unsupported DXGI format */
g_message("Unsupported DXGI format (%d)", dx10hdr->dxgiFormat);
return(0);
}
}
return(1);
}
static int load_layer(FILE *fp, dds_header_t *hdr, dds_load_info_t *d,
gint32 image, unsigned int level, char *prefix,
unsigned int *l, guchar *pixels, unsigned char *buf)
{
GimpDrawable *drawable;
GimpPixelRgn pixel_region;
GimpImageType type = GIMP_RGBA_IMAGE;
gchar *layer_name;
gint x, y, z, n;
gint32 layer;
unsigned int width = hdr->width >> level;
unsigned int height = hdr->height >> level;
unsigned int size = hdr->pitch_or_linsize >> (2 * level);
int format = DDS_COMPRESS_NONE;
if(width < 1) width = 1;
if(height < 1) height = 1;
switch(d->bpp)
{
case 1:
if(hdr->pixelfmt.flags & DDPF_PALETTEINDEXED8)
type = GIMP_INDEXED_IMAGE;
else if(hdr->pixelfmt.rmask == 0xe0)
type = GIMP_RGB_IMAGE;
else if(hdr->pixelfmt.flags & DDPF_ALPHA)
type = GIMP_GRAYA_IMAGE;
else
type = GIMP_GRAY_IMAGE;
break;
case 2:
if(hdr->pixelfmt.amask == 0xf000) //RGBA4
type = GIMP_RGBA_IMAGE;
else if(hdr->pixelfmt.amask == 0xff00) //L8A8
type = GIMP_GRAYA_IMAGE;
else if(hdr->pixelfmt.bmask == 0x1f) //R5G6B5 or RGB5A1
type = (hdr->pixelfmt.amask == 0x8000) ? GIMP_RGBA_IMAGE : GIMP_RGB_IMAGE;
else //L16
type = GIMP_GRAY_IMAGE;
break;
case 3: type = GIMP_RGB_IMAGE; break;
case 4: type = GIMP_RGBA_IMAGE; break;
}
layer_name = (level) ? g_strdup_printf("mipmap %d %s", level, prefix) :
g_strdup_printf("main surface %s", prefix);
layer = gimp_layer_new(image, layer_name, width, height, type, 100,
GIMP_NORMAL_MODE);
g_free(layer_name);
#if GIMP_CHECK_VERSION(2, 8, 0)
gimp_image_insert_layer(image, layer, 0, *l);
#else
gimp_image_add_layer(image, layer, *l);
#endif
if((*l)++) gimp_drawable_set_visible(layer, FALSE);
drawable = gimp_drawable_get(layer);
gimp_pixel_rgn_init(&pixel_region, drawable, 0, 0, drawable->width,
drawable->height, TRUE, FALSE);
if(hdr->pixelfmt.flags & DDPF_FOURCC)
{
unsigned int w = (width + 3) >> 2;
unsigned int h = (height + 3) >> 2;
switch(GETL32(hdr->pixelfmt.fourcc))
{
case FOURCC('D','X','T','1'): format = DDS_COMPRESS_BC1; break;
case FOURCC('D','X','T','3'): format = DDS_COMPRESS_BC2; break;
case FOURCC('D','X','T','5'): format = DDS_COMPRESS_BC3; break;
case FOURCC('R','X','G','B'): format = DDS_COMPRESS_BC3; break;
case FOURCC('A','T','I','1'):
case FOURCC('B','C','4','U'):
case FOURCC('B','C','4','S'): format = DDS_COMPRESS_BC4; break;
case FOURCC('A','T','I','2'):
case FOURCC('B','C','5','U'):
case FOURCC('B','C','5','S'): format = DDS_COMPRESS_BC5; break;
}
size = w * h;
if((format == DDS_COMPRESS_BC1) || (format == DDS_COMPRESS_BC4))
size *= 8;
else
size *= 16;
}
if((hdr->flags & DDSD_LINEARSIZE) &&
!fread(buf, size, 1, fp))
{
g_message("Unexpected EOF.\n");
return(0);
}
if((hdr->pixelfmt.flags & DDPF_RGB) || (hdr->pixelfmt.flags & DDPF_ALPHA))
{
z = 0;
for(y = 0, n = 0; y < height; ++y, ++n)
{
if(n >= d->tile_height)
{
gimp_pixel_rgn_set_rect(&pixel_region, pixels, 0, y - n,
drawable->width, n);
n = 0;
gimp_progress_update((double)y / (double)hdr->height);
}
if((hdr->flags & DDSD_PITCH) &&
!fread(buf, width * d->bpp, 1, fp))
{
g_message("Unexpected EOF.\n");
return(0);
}
if(!(hdr->flags & DDSD_LINEARSIZE)) z = 0;
for(x = 0; x < drawable->width; ++x)
{
unsigned int pixel = buf[z];
unsigned int pos = (n * drawable->width + x) * d->gimp_bpp;
if(d->bpp > 1) pixel += ((unsigned int)buf[z + 1] << 8);
if(d->bpp > 2) pixel += ((unsigned int)buf[z + 2] << 16);
if(d->bpp > 3) pixel += ((unsigned int)buf[z + 3] << 24);
if(d->bpp >= 3)
{
if(hdr->pixelfmt.amask == 0xc0000000) // handle RGB10A2
{
pixels[pos + 0] = (pixel >> d->bshift) >> 2;
pixels[pos + 1] = (pixel >> d->gshift) >> 2;
pixels[pos + 2] = (pixel >> d->rshift) >> 2;
if(hdr->pixelfmt.flags & DDPF_ALPHAPIXELS)
pixels[pos + 3] = (pixel >> d->ashift << (8 - d->abits) & d->amask) * 255 / d->amask;
}
else
{
pixels[pos] =
(pixel >> d->rshift << (8 - d->rbits) & d->rmask) * 255 / d->rmask;
pixels[pos + 1] =
(pixel >> d->gshift << (8 - d->gbits) & d->gmask) * 255 / d->gmask;
pixels[pos + 2] =
(pixel >> d->bshift << (8 - d->bbits) & d->bmask) * 255 / d->bmask;
if(hdr->pixelfmt.flags & DDPF_ALPHAPIXELS)
{
pixels[pos + 3] =
(pixel >> d->ashift << (8 - d->abits) & d->amask) * 255 / d->amask;
}
}
}
else if(d->bpp == 2)
{
if(hdr->pixelfmt.amask == 0xf000) //RGBA4
{
pixels[pos] =
(pixel >> d->rshift << (8 - d->rbits) & d->rmask) * 255 / d->rmask;
pixels[pos + 1] =
(pixel >> d->gshift << (8 - d->gbits) & d->gmask) * 255 / d->gmask;
pixels[pos + 2] =
(pixel >> d->bshift << (8 - d->bbits) & d->bmask) * 255 / d->bmask;
pixels[pos + 3] =
(pixel >> d->ashift << (8 - d->abits) & d->amask) * 255 / d->amask;
}
else if(hdr->pixelfmt.amask == 0xff00) //L8A8
{
pixels[pos] =
(pixel >> d->rshift << (8 - d->rbits) & d->rmask) * 255 / d->rmask;
pixels[pos + 1] =
(pixel >> d->ashift << (8 - d->abits) & d->amask) * 255 / d->amask;
}
else if(hdr->pixelfmt.bmask == 0x1f) //R5G6B5 or RGB5A1
{
pixels[pos] =
(pixel >> d->rshift << (8 - d->rbits) & d->rmask) * 255 / d->rmask;
pixels[pos + 1] =
(pixel >> d->gshift << (8 - d->gbits) & d->gmask) * 255 / d->gmask;
pixels[pos + 2] =
(pixel >> d->bshift << (8 - d->bbits) & d->bmask) * 255 / d->bmask;
if(hdr->pixelfmt.amask == 0x8000)
{
pixels[pos + 3] =
(pixel >> d->ashift << (8 - d->abits) & d->amask) * 255 / d->amask;
}
}
else //L16
pixels[pos] = (unsigned char)(255 * ((float)(pixel & 0xffff) / 65535.0f));
}
else
{
if(hdr->pixelfmt.flags & DDPF_PALETTEINDEXED8)
{
pixels[pos] = pixel & 0xff;
}
else if(hdr->pixelfmt.rmask == 0xe0) // R3G3B2
{
pixels[pos] =
(pixel >> d->rshift << (8 - d->rbits) & d->rmask) * 255 / d->rmask;
pixels[pos + 1] =
(pixel >> d->gshift << (8 - d->gbits) & d->gmask) * 255 / d->gmask;