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gimp/plug-ins/file-dds/ddsread.c

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/*
* DDS GIMP plugin
*
* Copyright (C) 2004-2012 Shawn Kirst <skirst@gmail.com>,
* with parts (C) 2003 Arne Reuter <homepage@arnereuter.de> 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 <homepage@arnereuter.de>
** URL: http://www.dr-reuter.de/arne/dds.html
**
*/
#include "config.h"
#include <errno.h>
#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 <libgimp/stdplugins-intl.h>
#include "dds.h"
#include "ddsread.h"
#include "dxt.h"
#include "endian_rw.h"
#include "formats.h"
#include "imath.h"
#include "misc.h"
/*
* Struct containing all info needed to parse the file.
* This can be thought of as a version-agnostic header,
* holding all relevant data from the two headers
* plus some GIMP-specific information.
*/
typedef struct
{
fmt_read_info_t read_info;
gchar fourcc[4];
gchar gimp_fourcc[4];
guint flags;
guint fmt_flags;
guint bpp;
guint gimp_bpp;
DXGI_FORMAT dxgi_format;
D3DFORMAT d3d9_format;
DDS_COMPRESSION_TYPE comp_format;
guint width;
guint height;
gint tile_height;
gsize linear_size;
gsize pitch;
guint mipmaps;
guint volume_slices;
guint array_items;
guint cubemap_faces;
guint gimp_version;
guchar *palette;
} dds_load_info_t;
static gboolean read_header (dds_header_t *hdr,
FILE *fp);
static gboolean read_header_dx10 (dds_header_dx10_t *hdr,
FILE *fp);
static gboolean validate_header (dds_header_t *hdr,
GError **error);
static gboolean validate_dx10_header (dds_header_dx10_t *dx10hdr,
dds_load_info_t *load_info,
GError **error);
static gboolean load_layer (FILE *fp,
dds_load_info_t *load_info,
GimpImage *image,
guint level,
gchar *prefix,
guint *layer_index,
guchar *pixels,
guchar *buf,
GError **error);
static gboolean load_mipmaps (FILE *fp,
dds_load_info_t *load_info,
GimpImage *image,
gchar *prefix,
guint *layer_index,
guchar *pixels,
guchar *buf,
gboolean read_mipmaps,
GError **error);
static gboolean load_face (FILE *fp,
dds_load_info_t *load_info,
GimpImage *image,
gchar *prefix,
guint *layer_index,
guchar *pixels,
guchar *buf,
gboolean read_mipmaps,
GError **error);
static gboolean load_dialog (GimpProcedure *procedure,
GimpProcedureConfig *config);
/* Read DDS file */
GimpPDBStatusType
read_dds (GFile *file,
GimpImage **ret_image,
gboolean interactive,
GimpProcedure *procedure,
GimpProcedureConfig *config,
GError **error)
{
GimpImage *image = NULL;
guint layer_index = 0;
guchar *buf, *pixels;
FILE *fp;
gsize file_size;
dds_header_t hdr;
dds_header_dx10_t dx10hdr;
dds_load_info_t load_info;
GList *layers;
GimpImageBaseType type;
GimpPrecision precision = GIMP_PRECISION_U8_NON_LINEAR;
gboolean read_mipmaps;
gboolean flip_import;
gint i, j;
if (interactive)
{
gimp_ui_init ("dds");
if (! load_dialog (procedure, config))
return GIMP_PDB_CANCEL;
}
g_object_get (config,
"load-mipmaps", &read_mipmaps,
"flip-image", &flip_import,
NULL);
fp = g_fopen (g_file_peek_path (file), "rb");
if (! fp)
{
g_set_error (error, G_FILE_ERROR, g_file_error_from_errno (errno),
_("Could not open '%s' for reading: %s"),
gimp_file_get_utf8_name (file), g_strerror (errno));
return GIMP_PDB_EXECUTION_ERROR;
}
/* Get total file size to compare against header info later */
fseek (fp, 0L, SEEK_END);
file_size = ftell (fp);
fseek (fp, 0L, SEEK_SET);
gimp_progress_init_printf (_("Loading: %s"), gimp_file_get_utf8_name (file));
/* Read standard header */
memset (&hdr, 0, sizeof (dds_header_t));
read_header (&hdr, fp);
/* Check that header is actually valid */
if (! validate_header (&hdr, error))
{
fclose (fp);
return GIMP_PDB_EXECUTION_ERROR;
}
/* Initialize load_info with data from header */
memset (&load_info, 0, sizeof (dds_load_info_t));
PUTL32 (load_info.fourcc, GETL32 (hdr.pixelfmt.fourcc));
load_info.flags = hdr.flags;
load_info.fmt_flags = hdr.pixelfmt.flags;
load_info.width = hdr.width;
load_info.height = hdr.height;
load_info.gimp_version = hdr.reserved.gimp_dds_special.version;
PUTL32 (load_info.gimp_fourcc, hdr.reserved.gimp_dds_special.extra_fourcc);
/* Get D3DFORMAT directly from FourCC if present there,
* otherwise find it based on provided bpp, masks, and flags */
if ((load_info.fmt_flags & DDPF_FOURCC) && (load_info.fourcc[1] == 0))
load_info.d3d9_format = GETL32 (load_info.fourcc);
else
load_info.d3d9_format = get_d3d9format (hdr.pixelfmt.bpp,
hdr.pixelfmt.rmask,
hdr.pixelfmt.gmask,
hdr.pixelfmt.bmask,
hdr.pixelfmt.amask,
hdr.pixelfmt.flags);
/* Read DX10 header if present */
memset (&dx10hdr, 0, sizeof (dds_header_dx10_t));
if (GETL32 (load_info.fourcc) == FOURCC ('D','X','1','0'))
{
read_header_dx10 (&dx10hdr, fp);
/* Check that DX10 header is actually valid */
if (! validate_dx10_header (&dx10hdr, &load_info, error))
{
fclose (fp);
return GIMP_PDB_EXECUTION_ERROR;
}
}
/* If format search was successful, get info needed to parse the file */
if (load_info.d3d9_format || load_info.dxgi_format)
{
load_info.read_info = get_format_read_info (load_info.d3d9_format,
load_info.dxgi_format);
if ((! hdr.pixelfmt.bpp) && load_info.d3d9_format)
hdr.pixelfmt.bpp = get_bpp_d3d9 (load_info.d3d9_format);
else if (load_info.dxgi_format)
hdr.pixelfmt.bpp = get_bpp_dxgi (load_info.dxgi_format);
/* Unset the FourCC flag as D3D formats will be handled as uncompressed */
if ((load_info.fmt_flags & DDPF_FOURCC) && load_info.d3d9_format)
load_info.fmt_flags &= ~DDPF_FOURCC;
}
/* Exit if uncompressed format could not be determined by any method */
if ((! (load_info.fmt_flags & DDPF_FOURCC)) &&
(! (load_info.d3d9_format || load_info.dxgi_format)))
{
fclose (fp);
g_set_error (error, G_FILE_ERROR, G_FILE_ERROR_FAILED,
_("Unsupported DDS pixel format:\n"
"bpp: %d, Rmask: %x, Gmask: %x, Bmask: %x, Amask: %x, flags: %u"),
hdr.pixelfmt.bpp,
hdr.pixelfmt.rmask, hdr.pixelfmt.gmask,
hdr.pixelfmt.bmask, hdr.pixelfmt.amask,
hdr.pixelfmt.flags);
return GIMP_PDB_EXECUTION_ERROR;
}
/* If compressed, determine the format used */
if (load_info.fmt_flags & DDPF_FOURCC)
{
if (GETL32 (load_info.fourcc) == FOURCC ('D','X','1','0'))
{
/* Compression type from DXGI format */
switch (dx10hdr.dxgiFormat)
{
case DXGI_FORMAT_BC1_TYPELESS:
case DXGI_FORMAT_BC1_UNORM:
case DXGI_FORMAT_BC1_UNORM_SRGB:
load_info.comp_format = DDS_COMPRESS_BC1;
break;
case DXGI_FORMAT_BC2_TYPELESS:
case DXGI_FORMAT_BC2_UNORM:
case DXGI_FORMAT_BC2_UNORM_SRGB:
load_info.comp_format = DDS_COMPRESS_BC2;
break;
case DXGI_FORMAT_BC3_TYPELESS:
case DXGI_FORMAT_BC3_UNORM:
case DXGI_FORMAT_BC3_UNORM_SRGB:
load_info.comp_format = DDS_COMPRESS_BC3;
break;
case DXGI_FORMAT_BC4_TYPELESS:
case DXGI_FORMAT_BC4_UNORM:
case DXGI_FORMAT_BC4_SNORM:
load_info.comp_format = DDS_COMPRESS_BC4;
break;
case DXGI_FORMAT_BC5_TYPELESS:
case DXGI_FORMAT_BC5_UNORM:
case DXGI_FORMAT_BC5_SNORM:
load_info.comp_format = DDS_COMPRESS_BC5;
break;
default:
load_info.comp_format = DDS_COMPRESS_MAX;
break;
}
}
else
{
/* Compression type from FourCC */
switch (GETL32 (load_info.fourcc))
{
case FOURCC ('D','X','T','1'):
load_info.comp_format = DDS_COMPRESS_BC1;
break;
case FOURCC ('D','X','T','2'):
case FOURCC ('D','X','T','3'):
load_info.comp_format = DDS_COMPRESS_BC2;
break;
case FOURCC ('D','X','T','4'):
case FOURCC ('D','X','T','5'):
case FOURCC ('R','X','G','B'):
load_info.comp_format = DDS_COMPRESS_BC3;
break;
case FOURCC ('A','T','I','1'):
case FOURCC ('B','C','4','U'):
case FOURCC ('B','C','4','S'):
load_info.comp_format = DDS_COMPRESS_BC4;
break;
case FOURCC ('A','T','I','2'):
case FOURCC ('B','C','5','U'):
case FOURCC ('B','C','5','S'):
load_info.comp_format = DDS_COMPRESS_BC5;
break;
default:
load_info.comp_format = DDS_COMPRESS_MAX;
break;
}
}
}
/* Determine resource type (cubemap, volume, array) and number of mipmaps.
* Filling in these variables conditionally here simplifies some checks later */
if (load_info.dxgi_format)
{
if (dx10hdr.resourceDimension == D3D10_RESOURCE_DIMENSION_TEXTURE3D)
load_info.volume_slices = hdr.depth;
if ((dx10hdr.resourceDimension == D3D10_RESOURCE_DIMENSION_TEXTURE2D) &&
(dx10hdr.miscFlag & D3D10_RESOURCE_MISC_TEXTURECUBE))
load_info.cubemap_faces = DDSCAPS2_CUBEMAP_ALL_FACES;
load_info.array_items = dx10hdr.arraySize;
}
else
{
/* This and the mipmap check below were originally AND, not OR,
* but some images out there only have one of these two flags,
* so for compatibility's sake we take the more lenient route */
if ((hdr.caps.caps2 & DDSCAPS2_VOLUME) ||
(load_info.flags & DDSD_DEPTH))
load_info.volume_slices = hdr.depth;
load_info.cubemap_faces = hdr.caps.caps2 & DDSCAPS2_CUBEMAP_ALL_FACES;
}
if ((hdr.caps.caps1 & DDSCAPS_MIPMAP) ||
(load_info.flags & DDSD_MIPMAPCOUNT))
load_info.mipmaps = hdr.num_mipmaps;
/* Historically many DDS exporters haven't set pitch/linearsize and the corresponding flags,
* or set them incorrectly, so it's more reliable to always compute these manually.
* See: https://learn.microsoft.com/en-us/windows/win32/direct3ddds/dx-graphics-dds-pguide
*/
if (load_info.fmt_flags & DDPF_FOURCC)
{
if (hdr.flags & DDSD_PITCH)
{
g_printerr ("Warning: DDSD_PITCH is incorrectly set for DDPF_FOURCC! (recovered)\n");
load_info.flags &= ~DDSD_PITCH;
}
if (! (hdr.flags & DDSD_LINEARSIZE))
{
g_printerr ("Warning: DDSD_LINEARSIZE is incorrectly not set for DDPF_FOURCC! (recovered)\n");
load_info.flags |= DDSD_LINEARSIZE;
}
load_info.pitch = MAX (1, (hdr.width + 3) >> 2);
if (load_info.comp_format == DDS_COMPRESS_BC1 ||
load_info.comp_format == DDS_COMPRESS_BC4)
{
load_info.pitch *= 8;
}
else
{
load_info.pitch *= 16;
}
load_info.linear_size = MAX (1, (hdr.height + 3) >> 2) * load_info.pitch;
if (load_info.linear_size != hdr.pitch_or_linsize)
{
g_printerr ("Unexpected linear size (%u) set to %u\n",
hdr.pitch_or_linsize, (guint32) load_info.linear_size);
}
}
else
{
if (! (hdr.flags & DDSD_PITCH))
{
g_printerr ("Warning: DDSD_PITCH is incorrectly not set for an uncompressed texture! (recovered)\n");
load_info.flags |= DDSD_PITCH;
}
if ((hdr.flags & DDSD_LINEARSIZE))
{
g_printerr ("Warning: DDSD_LINEARSIZE is incorrectly set for an uncompressed texture! (recovered)\n");
load_info.flags &= ~DDSD_LINEARSIZE;
}
load_info.pitch = (hdr.width * hdr.pixelfmt.bpp + 7) >> 3;
if (load_info.pitch != hdr.pitch_or_linsize)
{
g_printerr ("Unexpected pitch (%u) set to %u\n",
hdr.pitch_or_linsize, (guint32) load_info.pitch);
}
load_info.linear_size = load_info.pitch * hdr.height;
}
/* Determine bytes-per-pixel and GIMP type needed */
if (load_info.fmt_flags & DDPF_FOURCC)
{
/* Compressed */
switch (load_info.comp_format)
{
case DDS_COMPRESS_BC4:
load_info.bpp = load_info.gimp_bpp = 1; /* Gray */
type = GIMP_GRAY;
break;
case DDS_COMPRESS_BC5:
load_info.bpp = load_info.gimp_bpp = 3; /* RGB */
type = GIMP_RGB;
break;
default:
load_info.bpp = load_info.gimp_bpp = 4; /* RGBA */
type = GIMP_RGB;
break;
}
precision = GIMP_PRECISION_U8_NON_LINEAR;
}
else
{
/* Uncompressed */
load_info.bpp = hdr.pixelfmt.bpp >> 3;
type = load_info.read_info.gimp_type;
/* Set up GIMP bytes-per-pixel */
if (load_info.read_info.gimp_type == GIMP_INDEXED)
{
load_info.gimp_bpp = 1;
if (load_info.read_info.use_alpha)
load_info.gimp_bpp += 1;
}
else
{
if (load_info.read_info.gimp_type == GIMP_RGB)
load_info.gimp_bpp = 3;
else /* load_info.read_info.gimp_type == GIMP_GRAY */
load_info.gimp_bpp = 1;
if (load_info.read_info.use_alpha)
load_info.gimp_bpp += 1;
if (load_info.read_info.output_bit_depth == 16)
load_info.gimp_bpp *= 2;
else if (load_info.read_info.output_bit_depth == 32)
load_info.gimp_bpp *= 4;
}
/* Set up canvas precision */
if (load_info.read_info.output_bit_depth == 8)
{
precision = GIMP_PRECISION_U8_NON_LINEAR;
}
else if (load_info.read_info.output_bit_depth == 16)
{
if (load_info.read_info.is_float)
precision = GIMP_PRECISION_HALF_LINEAR;
else
precision = GIMP_PRECISION_U16_NON_LINEAR;
}
else if (load_info.read_info.output_bit_depth == 32)
{
if (load_info.read_info.is_float)
precision = GIMP_PRECISION_FLOAT_LINEAR;
else
precision = GIMP_PRECISION_U32_NON_LINEAR;
}
}
/* Verify header information is accurate to avoid allocating more memory than is actually needed */
if (load_info.bpp < 1 ||
(load_info.linear_size > (file_size - sizeof (hdr))))
{
fclose (fp);
g_set_error (error, G_FILE_ERROR, g_file_error_from_errno (errno),
_("Invalid or corrupted DDS header."));
return GIMP_PDB_EXECUTION_ERROR;
}
/* Generate GIMP image with set precision */
image = gimp_image_new_with_precision (load_info.width,
load_info.height,
type, precision);
if (! image)
{
g_set_error (error, G_FILE_ERROR, G_FILE_ERROR_NOMEM,
_("Could not allocate a new image."));
fclose (fp);
return GIMP_PDB_EXECUTION_ERROR;
}
/* Read palette for indexed DDS */
if (load_info.fmt_flags & DDPF_PALETTEINDEXED8)
{
load_info.palette = g_malloc (256 * 4);
if (fread (load_info.palette, 1, 1024, fp) != 1024)
{
g_set_error (error, G_FILE_ERROR, G_FILE_ERROR_FAILED,
_("Error reading palette."));
fclose (fp);
gimp_image_delete (image);
return GIMP_PDB_EXECUTION_ERROR;
}
for (i = j = 0; i < 768; i += 3, j += 4)
{
load_info.palette[i + 0] = load_info.palette[j + 0];
load_info.palette[i + 1] = load_info.palette[j + 1];
load_info.palette[i + 2] = load_info.palette[j + 2];
}
gimp_image_set_colormap (image, load_info.palette, 256);
}
load_info.tile_height = gimp_tile_height ();
pixels = g_new (guchar, load_info.tile_height * load_info.width * load_info.gimp_bpp);
buf = g_malloc (load_info.linear_size);
if (load_info.cubemap_faces) /* Cubemap texture */
{
if ((load_info.cubemap_faces & DDSCAPS2_CUBEMAP_POSITIVEX) &&
! load_face (fp, &load_info, image, "(positive x)",
&layer_index, pixels, buf, read_mipmaps, error))
{
fclose (fp);
gimp_image_delete (image);
return GIMP_PDB_EXECUTION_ERROR;
}
if ((load_info.cubemap_faces & DDSCAPS2_CUBEMAP_NEGATIVEX) &&
! load_face (fp, &load_info, image, "(negative x)",
&layer_index, pixels, buf, read_mipmaps, error))
{
fclose (fp);
gimp_image_delete (image);
return GIMP_PDB_EXECUTION_ERROR;
}
if ((load_info.cubemap_faces & DDSCAPS2_CUBEMAP_POSITIVEY) &&
! load_face (fp, &load_info, image, "(positive y)",
&layer_index, pixels, buf, read_mipmaps, error))
{
fclose (fp);
gimp_image_delete (image);
return GIMP_PDB_EXECUTION_ERROR;
}
if ((load_info.cubemap_faces & DDSCAPS2_CUBEMAP_NEGATIVEY) &&
! load_face (fp, &load_info, image, "(negative y)",
&layer_index, pixels, buf, read_mipmaps, error))
{
fclose (fp);
gimp_image_delete (image);
return GIMP_PDB_EXECUTION_ERROR;
}
if ((load_info.cubemap_faces & DDSCAPS2_CUBEMAP_POSITIVEZ) &&
! load_face (fp, &load_info, image, "(positive z)",
&layer_index, pixels, buf, read_mipmaps, error))
{
fclose (fp);
gimp_image_delete (image);
return GIMP_PDB_EXECUTION_ERROR;
}
if ((load_info.cubemap_faces & DDSCAPS2_CUBEMAP_NEGATIVEZ) &&
! load_face (fp, &load_info, image, "(negative z)",
&layer_index, pixels, buf, read_mipmaps, error))
{
fclose (fp);
gimp_image_delete (image);
return GIMP_PDB_EXECUTION_ERROR;
}
}
else if (load_info.volume_slices > 0) /* Volume texture */
{
guint i, level;
gchar *plane;
for (i = 0; i < load_info.volume_slices; ++i)
{
plane = g_strdup_printf ("(z = %d)", i);
if (! load_layer (fp, &load_info, image, 0, plane,
&layer_index, pixels, buf, error))
{
g_free (plane);
fclose (fp);
gimp_image_delete (image);
return GIMP_PDB_EXECUTION_ERROR;
}
g_free (plane);
}
if (read_mipmaps)
{
for (level = 1; level < load_info.mipmaps; ++level)
{
int n = load_info.volume_slices >> level;
if (n < 1)
n = 1;
for (i = 0; i < n; ++i)
{
plane = g_strdup_printf ("(z = %d)", i);
if (! load_layer (fp, &load_info, image, level, plane,
&layer_index, pixels, buf, error))
{
g_free (plane);
fclose (fp);
gimp_image_delete (image);
return GIMP_PDB_EXECUTION_ERROR;
}
g_free (plane);
}
}
}
}
else if (load_info.array_items > 1) /* Texture Array */
{
guint i;
gchar *elem;
for (i = 0; i < load_info.array_items; ++i)
{
elem = g_strdup_printf ("(array element %d)", i);
if (! load_layer (fp, &load_info, image, 0, elem, &layer_index,
pixels, buf, error))
{
fclose (fp);
gimp_image_delete (image);
return GIMP_PDB_EXECUTION_ERROR;
}
if (! load_mipmaps (fp, &load_info, image, elem, &layer_index,
pixels, buf, read_mipmaps, error))
{
fclose (fp);
gimp_image_delete (image);
return GIMP_PDB_EXECUTION_ERROR;
}
g_free (elem);
}
}
else /* Standard 2D texture */
{
if (! load_layer (fp, &load_info, image, 0, "", &layer_index,
pixels, buf, error))
{
fclose (fp);
gimp_image_delete (image);
return GIMP_PDB_EXECUTION_ERROR;
}
if (! load_mipmaps (fp, &load_info, image, "", &layer_index,
pixels, buf, read_mipmaps, error))
{
fclose (fp);
gimp_image_delete (image);
return GIMP_PDB_EXECUTION_ERROR;
}
}
gimp_progress_update (1.0);
if (load_info.fmt_flags & DDPF_PALETTEINDEXED8)
g_free (load_info.palette);
g_free (buf);
g_free (pixels);
fclose (fp);
layers = gimp_image_list_layers (image);
if (! layers)
{
/* XXX This error should never happen, and probably it should be a
* CRITICAL/g_return_if_fail(). Yet let's just set it to the
* GError until we better handle the debug dialog for plug-ins. A
* pop-up with this message will be easier to track. No need to
* localize it though.
*/
g_set_error (error, G_FILE_ERROR, G_FILE_ERROR_FAILED,
"Oops! NULL image read! Please report this!");
return GIMP_PDB_EXECUTION_ERROR;
}
gimp_image_take_selected_layers (image, layers);
if (flip_import)
gimp_image_flip (image, GIMP_ORIENTATION_VERTICAL);
*ret_image = image;
return GIMP_PDB_SUCCESS;
}
/*
* Read data from standard header
*/
static gboolean
read_header (dds_header_t *hdr,
FILE *fp)
{
guchar buf[DDS_HEADERSIZE];
if (fread (buf, 1, DDS_HEADERSIZE, fp) != DDS_HEADERSIZE)
return FALSE;
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 TRUE;
}
/*
* Read data from DX10 header
*/
static gboolean
read_header_dx10 (dds_header_dx10_t *dx10hdr,
FILE *fp)
{
gchar buf[DDS_HEADERSIZE_DX10];
if (fread (buf, 1, DDS_HEADERSIZE_DX10, fp) != DDS_HEADERSIZE_DX10)
return FALSE;
dx10hdr->dxgiFormat = GETL32 (buf);
dx10hdr->resourceDimension = GETL32 (buf + 4);
dx10hdr->miscFlag = GETL32 (buf + 8);
dx10hdr->arraySize = GETL32 (buf + 12);
dx10hdr->reserved = GETL32 (buf + 16);
return TRUE;
}
/*
* Check data from standard header for validity
* Invalid header data is corrected where possible
*/
static gboolean
validate_header (dds_header_t *hdr,
GError **error)
{
guint fourcc;
/* Check ~ m a g i c ~ */
if (hdr->magic != FOURCC ('D','D','S',' '))
{
g_set_error (error, G_FILE_ERROR, G_FILE_ERROR_INVAL,
_("Invalid DDS format magic number."));
return FALSE;
}
/* Check pixel format flags
* If none are set, try to recover based on what information is available */
fourcc = GETL32 (hdr->pixelfmt.fourcc);
if (! (hdr->pixelfmt.flags & DDPF_RGB) &&
! (hdr->pixelfmt.flags & DDPF_ALPHA) &&
! (hdr->pixelfmt.flags & DDPF_BUMPDUDV) &&
! (hdr->pixelfmt.flags & DDPF_BUMPLUMINANCE) &&
! (hdr->pixelfmt.flags & DDPF_ZBUFFER) &&
! (hdr->pixelfmt.flags & DDPF_FOURCC) &&
! (hdr->pixelfmt.flags & DDPF_LUMINANCE) &&
! (hdr->pixelfmt.flags & DDPF_PALETTEINDEXED8))
{
g_message (_("File lacks expected pixel format flags! "
"Image may not be decoded correctly."));
switch (fourcc)
{
case FOURCC ('D','X','T','1'):
case FOURCC ('D','X','T','2'):
case FOURCC ('D','X','T','3'):
case FOURCC ('D','X','T','4'):
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:
case 64:
hdr->pixelfmt.flags |= DDPF_RGB;
break;
default:
g_set_error (error, G_FILE_ERROR, G_FILE_ERROR_FAILED,
_("Invalid pixel format."));
return FALSE;
}
break;
}
}
/* Check all supported FourCC codes */
if ((hdr->pixelfmt.flags & DDPF_FOURCC) &&
fourcc != FOURCC ('D','X','T','1') &&
fourcc != FOURCC ('D','X','T','2') &&
fourcc != FOURCC ('D','X','T','3') &&
fourcc != FOURCC ('D','X','T','4') &&
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') &&
hdr->pixelfmt.fourcc[1] != 0)
{
g_set_error (error, G_FILE_ERROR, G_FILE_ERROR_FAILED,
_("Unsupported format (FourCC: %c%c%c%c, hex: %08x)"),
hdr->pixelfmt.fourcc[0],
hdr->pixelfmt.fourcc[1] != 0 ? hdr->pixelfmt.fourcc[1] : ' ',
hdr->pixelfmt.fourcc[2] != 0 ? hdr->pixelfmt.fourcc[2] : ' ',
hdr->pixelfmt.fourcc[3] != 0 ? hdr->pixelfmt.fourcc[3] : ' ',
GETL32 (hdr->pixelfmt.fourcc));
return FALSE;
}
/* Check bits-per-pixel */
if (hdr->pixelfmt.flags & DDPF_RGB)
{
if ((hdr->pixelfmt.bpp != 8) &&
(hdr->pixelfmt.bpp != 16) &&
(hdr->pixelfmt.bpp != 24) &&
(hdr->pixelfmt.bpp != 32) &&
(hdr->pixelfmt.bpp != 48) &&
(hdr->pixelfmt.bpp != 64) &&
(hdr->pixelfmt.bpp != 96) &&
(hdr->pixelfmt.bpp != 128))
{
g_set_error (error, G_FILE_ERROR, G_FILE_ERROR_FAILED,
_("Invalid bpp value for RGB data: %d"),
hdr->pixelfmt.bpp);
return FALSE;
}
}
else if (hdr->pixelfmt.flags & DDPF_LUMINANCE)
{
if ((hdr->pixelfmt.bpp != 8) &&
(hdr->pixelfmt.bpp != 16))
{
g_set_error (error, G_FILE_ERROR, G_FILE_ERROR_FAILED,
_("Invalid bpp value for luminance data: %d"),
hdr->pixelfmt.bpp);
return FALSE;
}
}
return TRUE;
}
/*
* Check data from DX10 header for validity
*/
static gboolean
validate_dx10_header (dds_header_dx10_t *dx10hdr,
dds_load_info_t *load_info,
GError **error)
{
if ((dx10hdr->resourceDimension != D3D10_RESOURCE_DIMENSION_TEXTURE1D) &&
(dx10hdr->resourceDimension != D3D10_RESOURCE_DIMENSION_TEXTURE2D) &&
(dx10hdr->resourceDimension != D3D10_RESOURCE_DIMENSION_TEXTURE3D))
{
g_set_error (error, G_FILE_ERROR, G_FILE_ERROR_FAILED,
_("Invalid DX10 header"));
return FALSE;
}
switch (dx10hdr->dxgiFormat)
{
case DXGI_FORMAT_BC1_TYPELESS:
case DXGI_FORMAT_BC1_UNORM:
case DXGI_FORMAT_BC1_UNORM_SRGB:
case DXGI_FORMAT_BC2_TYPELESS:
case DXGI_FORMAT_BC2_UNORM:
case DXGI_FORMAT_BC2_UNORM_SRGB:
case DXGI_FORMAT_BC3_TYPELESS:
case DXGI_FORMAT_BC3_UNORM:
case DXGI_FORMAT_BC3_UNORM_SRGB:
case DXGI_FORMAT_BC4_TYPELESS:
case DXGI_FORMAT_BC4_UNORM:
case DXGI_FORMAT_BC4_SNORM:
case DXGI_FORMAT_BC5_TYPELESS:
case DXGI_FORMAT_BC5_UNORM:
case DXGI_FORMAT_BC5_SNORM:
/* Return early for supported compressed formats */
return TRUE;
default:
/* Unset FourCC flag for uncompressed formats */
load_info->fmt_flags &= ~DDPF_FOURCC;
break;
}
if (! dxgiformat_supported (dx10hdr->dxgiFormat & 0xFF))
{
g_set_error (error, G_FILE_ERROR, G_FILE_ERROR_FAILED,
_("Unsupported DXGI Format: %u"),
dx10hdr->dxgiFormat & 0xFF);
return FALSE;
}
load_info->dxgi_format = dx10hdr->dxgiFormat & 0xFF;
return TRUE;
}
static const Babl *
premultiplied_variant (const Babl* format)
{
if (format == babl_format ("R'G'B'A u8"))
return babl_format ("R'aG'aB'aA u8");
else
g_printerr ("Add format %s to premultiplied_variant () %s: %d\n",
babl_get_name (format), __FILE__, __LINE__);
return format;
}
static gboolean
load_layer (FILE *fp,
dds_load_info_t *load_info,
GimpImage *image,
guint level,
gchar *prefix,
guint *layer_index,
guchar *pixels,
guchar *buf,
GError **error)
{
GeglBuffer *buffer;
const Babl *bablfmt = NULL;
gchar *babl_str = "";
GimpImageType type = GIMP_RGBA_IMAGE;
guint width = load_info->width >> level;
guint height = load_info->height >> level;
guint size = width * height * load_info->bpp;
gchar *layer_name;
GimpLayer *layer;
guint layerw;
gsize file_size;
gsize current_position;
gint x, y, n;
current_position = ftell (fp);
fseek (fp, 0L, SEEK_END);
file_size = ftell (fp);
fseek (fp, current_position, SEEK_SET);
if (width < 1) width = 1;
if (height < 1) height = 1;
/* Setup image type and Babl format */
if (load_info->fmt_flags & DDPF_FOURCC) /* Compressed */
{
/* Set Babl format */
switch (load_info->comp_format)
{
case DDS_COMPRESS_BC4:
type = GIMP_GRAY_IMAGE;
babl_str = "Y'";
break;
case DDS_COMPRESS_BC5:
type = GIMP_RGB_IMAGE;
babl_str = "R'G'B'";
break;
default:
type = GIMP_RGBA_IMAGE;
babl_str = "R'G'B'A";
break;
}
/* Set Babl precision */
if ((GETL32 (load_info->fourcc) == FOURCC ('D','X','1','0')) &&
(load_info->dxgi_format >= DXGI_FORMAT_BC6H_TYPELESS) &&
(load_info->dxgi_format <= DXGI_FORMAT_BC6H_SF16))
{
babl_str = g_strdup_printf ("%s %s", babl_str, "half");
}
else
{
babl_str = g_strdup_printf ("%s %s", babl_str, "u8");
}
}
else /* Uncompressed */
{
/* Set Babl format */
if (load_info->read_info.gimp_type == GIMP_INDEXED)
{
if (load_info->read_info.use_alpha)
type = GIMP_INDEXEDA_IMAGE;
else
type = GIMP_INDEXED_IMAGE;
}
else if (load_info->read_info.gimp_type == GIMP_RGB)
{
if (load_info->read_info.use_alpha)
{
type = GIMP_RGBA_IMAGE;
babl_str = "R'G'B'A";
}
else
{
type = GIMP_RGB_IMAGE;
babl_str = "R'G'B'";
}
}
else /* load_info->read_info.gimp_type == GIMP_GRAY */
{
if (load_info->read_info.use_alpha)
{
type = GIMP_GRAYA_IMAGE;
babl_str = "Y'A";
}
else
{
type = GIMP_GRAY_IMAGE;
babl_str = "Y'";
}
}
/* Set Babl precision */
if (load_info->read_info.is_float)
{
/* Floating-point */
if (load_info->read_info.output_bit_depth == 16)
babl_str = g_strdup_printf ("%s %s", babl_str, "half");
else /* load_info->read_info.output_bit_depth == 32 */
babl_str = g_strdup_printf ("%s %s", babl_str, "float");
}
else
{
/* Integer */
if (load_info->read_info.output_bit_depth == 32)
babl_str = g_strdup_printf ("%s %s", babl_str, "u32");
else if (load_info->read_info.output_bit_depth == 16)
babl_str = g_strdup_printf ("%s %s", babl_str, "u16");
else /* load_info->read_info.output_bit_depth == 8 */
babl_str = g_strdup_printf ("%s %s", babl_str, "u8");
}
}
if (! (load_info->read_info.gimp_type == GIMP_INDEXED))
bablfmt = babl_format (babl_str);
g_free (babl_str);
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_image_get_default_new_layer_mode (image));
g_free (layer_name);
gimp_image_insert_layer (image, layer, NULL, *layer_index);
if (type == GIMP_INDEXED_IMAGE || type == GIMP_INDEXEDA_IMAGE)
bablfmt = gimp_drawable_get_format (GIMP_DRAWABLE (layer));
if ((*layer_index)++)
gimp_item_set_visible (GIMP_ITEM (layer), FALSE);
buffer = gimp_drawable_get_buffer (GIMP_DRAWABLE (layer));
layerw = gegl_buffer_get_width (buffer);
if (load_info->fmt_flags & DDPF_FOURCC)
{
size = ((width + 3) >> 2) * ((height + 3) >> 2);
/* Let Babl handle premultiplied format conversion */
if ((GETL32 (load_info->fourcc) == FOURCC ('D','X','T','2')) ||
(GETL32 (load_info->fourcc) == FOURCC ('D','X','T','4')))
bablfmt = premultiplied_variant (bablfmt);
if ((load_info->comp_format == DDS_COMPRESS_BC1) ||
(load_info->comp_format == DDS_COMPRESS_BC4))
size *= 8;
else
size *= 16;
}
if (size > (file_size - current_position) ||
size > load_info->linear_size)
{
g_set_error (error, G_FILE_ERROR, G_FILE_ERROR_FAILED,
_("Requested data exceeds size of file.\n"));
return FALSE;
}
if ((load_info->flags & DDSD_LINEARSIZE) &&
! fread (buf, size, 1, fp))
{
g_set_error (error, G_FILE_ERROR, G_FILE_ERROR_FAILED,
_("Unexpected EOF.\n"));
return FALSE;
}
if (! (load_info->fmt_flags & DDPF_FOURCC)) /* Read uncompressed pixel data */
{
guint rowstride = width * load_info->bpp;
guint32 sign_add[4] = { 0, 0, 0, 0 };
guint idx_r = 0, idx_b = 2;
/* Prior plug-in versions (3.9.91 and earlier) wrote the R and G channels reversed for RGB10A2. */
if ((load_info->gimp_version > 0) &&
(load_info->gimp_version <= 199003) &&
(load_info->d3d9_format == D3DFMT_A2R10G10B10))
{
g_printerr ("Switching incorrect red and green channels in RGB10A2 DDS "
"written by an older version of GIMP's DDS plug-in.\n");
idx_r = 2;
idx_b = 0;
}
/* Set up offset to apply to signed integer formats
* Per-channel to accommodate for mixed formats */
if (load_info->read_info.is_signed &&
(! load_info->read_info.is_float))
{
if (load_info->read_info.output_bit_depth == 8)
{
sign_add[0] = 128;
sign_add[1] = 128;
if (! (load_info->d3d9_format == D3DFMT_L6V5U5 ||
load_info->d3d9_format == D3DFMT_X8L8V8U8))
sign_add[2] = 128;
sign_add[3] = 128;
}
else if (load_info->read_info.output_bit_depth == 16)
{
sign_add[0] = 32768;
sign_add[1] = 32768;
sign_add[2] = 32768;
if (! (load_info->d3d9_format == D3DFMT_A2W10V10U10 ||
load_info->dxgi_format == DXGI_FORMAT_R10G10B10_SNORM_A2_UNORM))
sign_add[3] = 32768;
}
else /* load_info->read_info.output_bit_depth == 32 */
{
sign_add[0] = 2147483648;
sign_add[1] = 2147483648;
sign_add[2] = 2147483648;
sign_add[3] = 2147483648;
}
}
if ((load_info->flags & DDSD_PITCH) && (rowstride > load_info->pitch))
{
g_set_error (error, G_FILE_ERROR, G_FILE_ERROR_FAILED,
_("Requested data exceeds size of file.\n"));
return FALSE;
}
for (y = 0, n = 0; y < height; ++y, ++n)
{
if (n >= load_info->tile_height)
{
gegl_buffer_set (buffer, GEGL_RECTANGLE (0, y - n, layerw, n), 0,
bablfmt, pixels, GEGL_AUTO_ROWSTRIDE);
n = 0;
gimp_progress_update ((gdouble) y / (gdouble) load_info->height);
}
if (load_info->flags & DDSD_PITCH)
{
current_position = ftell (fp);
if (rowstride > (file_size - current_position))
{
g_set_error (error, G_FILE_ERROR, G_FILE_ERROR_FAILED,
_("Requested data exceeds size of file.\n"));
return FALSE;
}
if (! fread (buf, rowstride, 1, fp))
{
g_set_error (error, G_FILE_ERROR, G_FILE_ERROR_FAILED,
_("Unexpected EOF.\n"));
return FALSE;
}
}
for (x = 0; x < layerw; ++x)
{
guint pos = (n * layerw + x) * load_info->gimp_bpp;
guint buf_reads = 0;
guchar read_buf;
guint32 ch_registers[4];
memset (ch_registers, 0, sizeof (ch_registers));
/* Format-agnostic bit-reader, driven by the 'format_read_info' table.
* Reads one bit at a time from source bytes into per-channel registers.
* While somewhat simplistic, reading bit-by-bit allows us to handle channels
* that cross byte boundaries trivially, and without the need for look-ahead.
*/
read_buf = *buf;
for (gint reg = 0; reg < 4; reg++)
{
const guchar ch = load_info->read_info.channel_order[reg];
const guchar ch_bits = load_info->read_info.channel_bits[reg];
const guint32 write_bit = 1 << (ch_bits - 1);
if (! ch_bits) continue;
/* Note: bits are written to the registers in the opposite order they're read in */
for (gint bit = 0; bit < ch_bits; bit++)
{
ch_registers[ch] >>= 1;
ch_registers[ch] |= read_buf & 1 ? write_bit : 0;
read_buf >>= 1;
buf_reads++;
if (buf_reads == 8)
{
/* Roll-over to next byte */
buf++;
read_buf = *buf;
buf_reads = 0;
}
}
/* Most DXGI small-float formats have 5 exponent bits, so can be interpreted as 16-bit floats with a simple shift.
* Integers meanwhile must be properly requantized to the output range */
if (load_info->read_info.is_float)
{
guint shift = load_info->read_info.output_bit_depth - ch_bits;
if (load_info->dxgi_format == DXGI_FORMAT_R9G9B9E5_SHAREDEXP ||
load_info->dxgi_format == DXGI_FORMAT_R10G10B10_7E3_A2_FLOAT ||
load_info->dxgi_format == DXGI_FORMAT_R10G10B10_6E4_A2_FLOAT)
/* Skip shifting for float formats that require special handling */
shift = 0;
else if (! load_info->read_info.is_signed)
/* Don't shift into sign bit for unsigned floats, eg. R11G11B10 */
shift -= 1;
ch_registers[ch] = ch_registers[ch] << shift;
}
else
{
ch_registers[ch] = requantize_component (ch_registers[ch], ch_bits,
load_info->read_info.output_bit_depth);
}
}
/* Special cases for formats requiring extra decoding */
if (load_info->dxgi_format == DXGI_FORMAT_R9G9B9E5_SHAREDEXP)
float_from_9e5 (ch_registers);
else if (load_info->dxgi_format == DXGI_FORMAT_R10G10B10_7E3_A2_FLOAT)
float_from_7e3a2 (ch_registers);
else if (load_info->dxgi_format == DXGI_FORMAT_R10G10B10_6E4_A2_FLOAT)
float_from_6e4a2 (ch_registers);
else if (load_info->d3d9_format == D3DFMT_CxV8U8)
reconstruct_z (ch_registers);
/* Clear alpha to all 1s instead of all 0s */
if (! load_info->read_info.use_alpha)
ch_registers[3] = G_MAXUINT32;
/* Output converted values to canvas pixels */
if (load_info->read_info.gimp_type == GIMP_RGB)
{
if (load_info->read_info.output_bit_depth == 8)
{
guchar *pixel8 = (guchar *) &pixels[pos];
pixel8[0] = ch_registers[0] + sign_add[0];
pixel8[1] = ch_registers[1] + sign_add[1];
pixel8[2] = ch_registers[2] + sign_add[2];
if (load_info->read_info.use_alpha)
pixel8[3] = ch_registers[3] + sign_add[3];
}
else if (load_info->read_info.output_bit_depth == 16)
{
/* Variable indices for R and B to accommodate RGB10A2 fixup */
guint16 *pixel16 = (guint16 *) &pixels[pos];
pixel16[0] = ch_registers[idx_r] + sign_add[0];
pixel16[1] = ch_registers[1] + sign_add[1];
pixel16[2] = ch_registers[idx_b] + sign_add[2];
if (load_info->read_info.use_alpha)
pixel16[3] = ch_registers[3] + sign_add[3];
}
else /* load_info->read_info.output_bit_depth == 32 */
{
guint32 *pixel32 = (guint32 *) &pixels[pos];
pixel32[0] = (guint64) ch_registers[0] + sign_add[0];
pixel32[1] = (guint64) ch_registers[1] + sign_add[1];
pixel32[2] = (guint64) ch_registers[2] + sign_add[2];
if (load_info->read_info.use_alpha)
pixel32[3] = (guint64) ch_registers[3] + sign_add[3];
}
}
else if (load_info->read_info.gimp_type == GIMP_GRAY)
{
if (load_info->read_info.output_bit_depth == 8)
{
guchar *pixel8 = (guchar *) &pixels[pos];
pixel8[0] = ch_registers[0] + sign_add[0];
if (load_info->read_info.use_alpha)
pixel8[1] = ch_registers[3] + sign_add[3];
}
else if (load_info->read_info.output_bit_depth == 16)
{
guint16 *pixel16 = (guint16 *) &pixels[pos];
pixel16[0] = ch_registers[0] + sign_add[0];
if (load_info->read_info.use_alpha)
pixel16[1] = ch_registers[3] + sign_add[3];
}
else /* load_info->read_info.output_bit_depth == 32 */
{
guint32 *pixel32 = (guint32 *) &pixels[pos];
pixel32[0] = (guint64) ch_registers[0] + sign_add[0];
if (load_info->read_info.use_alpha)
pixel32[1] = (guint64) ch_registers[3] + sign_add[3];
}
}
else /* load_info->read_info.gimp_type == GIMP_INDEXED */
{
pixels[pos] = ch_registers[0] & 0xFF;
if (load_info->read_info.use_alpha)
pixels[pos + 1] = ch_registers[3] & 0xFF;
}
}
}
gegl_buffer_set (buffer, GEGL_RECTANGLE (0, y - n, layerw, n), 0,
bablfmt, pixels, GEGL_AUTO_ROWSTRIDE);
}
else /* Read compressed pixel data */
{
guchar *dst;
dst = g_malloc (width * height * load_info->gimp_bpp);
memset (dst, 0, width * height * load_info->gimp_bpp);
/* Initialize alpha to all 1s instead of all 0s */
if (load_info->gimp_bpp == 4)
{
for (y = 0; y < height; ++y)
{
for (x = 0; x < width; ++x)
{
dst[y * (width * 4) + (x * 4) + 3] = 255;
}
}
}
dxt_decompress (dst, buf, load_info->comp_format, size, width, height,
load_info->gimp_bpp, load_info->fmt_flags & DDPF_NORMAL);
/* Prior plug-in versions (before 3.9.90) wrote the R and G channels reversed for BC5. */
if ((load_info->gimp_version > 0) &&
(load_info->gimp_version <= 199002) &&
(load_info->comp_format == DDS_COMPRESS_BC5))
{
g_printerr ("Switching incorrect red and green channels in BC5 DDS "
"written by an older version of GIMP's DDS plug-in.\n");
for (y = 0; y < height; ++y)
{
for (x = 0; x < width; ++x)
{
guchar tmpG;
guint pix_width = width * load_info->gimp_bpp;
guint x_width = x * load_info->gimp_bpp;
tmpG = dst[y * pix_width + x_width];
dst[y * pix_width + x_width] = dst[y * pix_width + x_width + 1];
dst[y * pix_width + x_width + 1] = tmpG;
}
}
}
for (y = 0, n = 0; y < height; ++y, ++n)
{
if (n >= load_info->tile_height)
{
gegl_buffer_set (buffer, GEGL_RECTANGLE (0, y - n, layerw, n), 0,
bablfmt, pixels, GEGL_AUTO_ROWSTRIDE);
n = 0;
gimp_progress_update ((gdouble) y / (gdouble) load_info->height);
}
memcpy (pixels + n * layerw * load_info->gimp_bpp,
dst + y * layerw * load_info->gimp_bpp,
width * load_info->gimp_bpp);
}
gegl_buffer_set (buffer, GEGL_RECTANGLE (0, y - n, layerw, n), 0,
bablfmt, pixels, GEGL_AUTO_ROWSTRIDE);
g_free (dst);
}
gegl_buffer_flush (buffer);
g_object_unref (buffer);
/* Decode files with GIMP-specific encodings */
if (load_info->gimp_version > 0)
{
switch (GETL32 (load_info->gimp_fourcc))
{
case FOURCC ('A','E','X','P'):
decode_alpha_exponent (GIMP_DRAWABLE (layer));
break;
case FOURCC ('Y','C','G','1'):
decode_ycocg (GIMP_DRAWABLE (layer));
break;
case FOURCC ('Y','C','G','2'):
decode_ycocg_scaled (GIMP_DRAWABLE (layer));
break;
default:
break;
}
}
return TRUE;
}
static gboolean
load_mipmaps (FILE *fp,
dds_load_info_t *load_info,
GimpImage *image,
gchar *prefix,
guint *layer_index,
guchar *pixels,
guchar *buf,
gboolean read_mipmaps,
GError **error)
{
guint level;
if (read_mipmaps)
{
for (level = 1; level < load_info->mipmaps; ++level)
{
if (! load_layer (fp, load_info, image, level, prefix, layer_index,
pixels, buf, error))
return FALSE;
}
}
else
{
/* Skip past mipmaps, as simply not reading them leaves us in the wrong pos for subsequent layers */
for (level = 1; level < load_info->mipmaps; ++level)
{
guint width = MAX (1, load_info->width >> level);
guint height = MAX (1, load_info->height >> level);
guint size = load_info->linear_size >> (2 * level);
if (load_info->fmt_flags & DDPF_FOURCC)
{
size = ((width + 3) >> 2) * ((height + 3) >> 2);
if ((load_info->comp_format == DDS_COMPRESS_BC1) ||
(load_info->comp_format == DDS_COMPRESS_BC4))
size *= 8;
else
size *= 16;
}
fseek (fp, size, SEEK_CUR);
}
}
return TRUE;
}
static gboolean
load_face (FILE *fp,
dds_load_info_t *load_info,
GimpImage *image,
gchar *prefix,
guint *layer_index,
guchar *pixels,
guchar *buf,
gboolean read_mipmaps,
GError **error)
{
if (! load_layer (fp, load_info, image, 0, prefix,
layer_index, pixels, buf, error))
return FALSE;
return load_mipmaps (fp, load_info, image, prefix, layer_index,
pixels, buf, read_mipmaps, error);
}
static gboolean
load_dialog (GimpProcedure *procedure,
GimpProcedureConfig *config)
{
GtkWidget *dialog;
GtkWidget *vbox;
gboolean run;
dialog = gimp_procedure_dialog_new (procedure,
config,
_("Open DDS"));
vbox = gimp_procedure_dialog_fill_box (GIMP_PROCEDURE_DIALOG (dialog),
"dds-read-box",
"load-mipmaps",
"flip-image",
NULL);
gtk_box_set_spacing (GTK_BOX (vbox), 8);
gtk_container_set_border_width (GTK_CONTAINER (vbox), 8);
gimp_procedure_dialog_fill (GIMP_PROCEDURE_DIALOG (dialog),
"dds-read-box", NULL);
gtk_widget_show (dialog);
run = gimp_procedure_dialog_run (GIMP_PROCEDURE_DIALOG (dialog));
gtk_widget_destroy (dialog);
return run;
}
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