Adding upstream version 2.10.36.upstream/2.10.36

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 1486 insertions, 0 deletions

diff --git a/plug-ins/common/file-tga.c b/plug-ins/common/file-tga.c
new file mode 100644
index 0000000..e833c60
--- /dev/null
+++ b/plug-ins/common/file-tga.c
@@ -0,0 +1,1486 @@
+/* GIMP - The GNU Image Manipulation Program
+ * Copyright (C) 1995 Spencer Kimball and Peter Mattis
+ *
+ * TrueVision Targa loading and exporting file filter for GIMP.
+ * Targa code Copyright (C) 1997 Raphael FRANCOIS and Gordon Matzigkeit
+ *
+ * The Targa reading and writing code was written from scratch by
+ * Raphael FRANCOIS <fraph@ibm.net> and Gordon Matzigkeit
+ * <gord@gnu.ai.mit.edu> based on the TrueVision TGA File Format
+ * Specification, Version 2.0:
+ *
+ *   <URL:ftp://ftp.truevision.com/pub/TGA.File.Format.Spec/>
+ *
+ * It does not contain any code written for other TGA file loaders.
+ * Not even the RLE handling. ;)
+ *
+ * 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 3 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.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
+/*
+ * Modified 2007-07-20, Raphaël Quinet <raphael@gimp.org>:
+ *   - Workaround for loading indexed images with full alpha channel.
+ *   - Bug fix: save_image() was saving uninitialized tile data for
+ *     indexed images with alpha.
+ *
+ * Modified August-November 2000, Nick Lamb <njl195@zepler.org.uk>
+ *   - Clean-up more code, avoid structure implementation dependency,
+ *   - Load more types of images reliably, reject others firmly
+ *   - This is not perfect, but I think it's much better. Test please!
+ *
+ * Release 1.2, 1997-09-24, Gordon Matzigkeit <gord@gnu.ai.mit.edu>:
+ *   - Bug fixes and source cleanups.
+ *
+ * Release 1.1, 1997-09-19, Gordon Matzigkeit <gord@gnu.ai.mit.edu>:
+ *   - Preserve alpha channels.  For indexed images, this can only be
+ *     done if there is at least one free colormap entry.
+ *
+ * Release 1.0, 1997-09-06, Gordon Matzigkeit <gord@gnu.ai.mit.edu>:
+ *   - Handle loading all image types from the 2.0 specification.
+ *   - Fix many alignment and endianness problems.
+ *   - Use tiles for lower memory consumption and better speed.
+ *   - Rewrite RLE code for clarity and speed.
+ *   - Handle saving with RLE.
+ *
+ * Release 0.9, 1997-06-18, Raphael FRANCOIS <fraph@ibm.net>:
+ *   - Can load 24 and 32-bit Truecolor images, with and without RLE.
+ *   - Saving currently only works without RLE.
+ *
+ *
+ * TODO:
+ *   - Handle TGA images with version 2 extensions (image comment,
+ *     resolution, date, ...).
+ *   - GIMP stores the indexed alpha channel as a separate byte,
+ *     one for each pixel.  The TGA file format spec requires that the
+ *     alpha channel be stored as part of the colormap, not with each
+ *     individual pixel.  This means that we have no good way of
+ *     saving and loading INDEXEDA images that use alpha channel values
+ *     other than 0 and 255.  Workaround implemented for loading by
+ *     promoting the image to RGBA, but saving indexed TGA images with
+ *     full alpha information in the coloramp is not supported yet (only
+ *     one fully transparent color is allowed in INDEXEDA mode).
+ */
+
+/* Set these for debugging. */
+/* #define PROFILE 1 */
+
+#include "config.h"
+
+#ifdef PROFILE
+# include <sys/times.h>
+#endif
+
+#include <errno.h>
+#include <string.h>
+
+#include <glib/gstdio.h>
+
+#include <libgimp/gimp.h>
+#include <libgimp/gimpui.h>
+
+#include "libgimp/stdplugins-intl.h"
+
+
+#define LOAD_PROC      "file-tga-load"
+#define SAVE_PROC      "file-tga-save"
+#define PLUG_IN_BINARY "file-tga"
+#define PLUG_IN_ROLE   "gimp-file-tga"
+
+typedef enum
+{
+  ORIGIN_TOP_LEFT    = 0,
+  ORIGIN_BOTTOM_LEFT = 1
+} TgaOrigin;
+
+typedef struct _TgaSaveVals
+{
+  gboolean   rle;
+  TgaOrigin  origin;
+} TgaSaveVals;
+
+static TgaSaveVals tsvals =
+{
+  TRUE,                 /* rle    */
+  ORIGIN_BOTTOM_LEFT    /* origin */
+};
+
+
+ /* TRUEVISION-XFILE magic signature string */
+static guchar magic[18] =
+{
+  0x54, 0x52, 0x55, 0x45, 0x56, 0x49, 0x53, 0x49, 0x4f,
+  0x4e, 0x2d, 0x58, 0x46, 0x49, 0x4c, 0x45, 0x2e, 0x0
+};
+
+typedef struct tga_info_struct
+{
+  guint8 idLength;
+  guint8 colorMapType;
+
+  guint8 imageType;
+  /* Known image types. */
+#define TGA_TYPE_MAPPED      1
+#define TGA_TYPE_COLOR       2
+#define TGA_TYPE_GRAY        3
+
+  guint8 imageCompression;
+  /* Only known compression is RLE */
+#define TGA_COMP_NONE        0
+#define TGA_COMP_RLE         1
+
+  /* Color Map Specification. */
+  /* We need to separately specify high and low bytes to avoid endianness
+     and alignment problems. */
+
+  guint16 colorMapIndex;
+  guint16 colorMapLength;
+  guint8 colorMapSize;
+
+  /* Image Specification. */
+  guint16 xOrigin;
+  guint16 yOrigin;
+
+  guint16 width;
+  guint16 height;
+
+  guint8 bpp;
+  guint8 bytes;
+
+  guint8 alphaBits;
+  guint8 flipHoriz;
+  guint8 flipVert;
+
+  /* Extensions (version 2) */
+
+/* Not all the structures described in the standard are transcribed here
+   only those which seem applicable to Gimp */
+
+  gchar   authorName[41];
+  gchar   comment[324];
+  guint   month, day, year, hour, minute, second;
+  gchar   jobName[41];
+  gchar   softwareID[41];
+  guint   pixelWidth, pixelHeight;  /* write dpi? */
+  gdouble gamma;
+} tga_info;
+
+
+/* Declare some local functions.
+ */
+static void      query         (void);
+static void      run           (const gchar      *name,
+                                gint              nparams,
+                                const GimpParam  *param,
+                                gint             *nreturn_vals,
+                                GimpParam       **return_vals);
+
+static gint32    load_image    (const gchar      *filename,
+                                GError          **error);
+static gint      save_image    (const gchar      *filename,
+                                gint32            image_ID,
+                                gint32            drawable_ID,
+                                GError          **error);
+
+static gboolean  save_dialog   (void);
+
+static gint32    ReadImage     (FILE             *fp,
+                                tga_info         *info,
+                                const gchar      *filename);
+
+
+const GimpPlugInInfo PLUG_IN_INFO =
+{
+  NULL,  /* init_proc  */
+  NULL,  /* quit_proc  */
+  query, /* query_proc */
+  run,   /* run_proc   */
+};
+
+
+MAIN ()
+
+static void
+query (void)
+{
+  static const GimpParamDef load_args[] =
+  {
+    { GIMP_PDB_INT32,  "run-mode",     "The run mode { RUN-INTERACTIVE (0), RUN-NONINTERACTIVE (1) }" },
+    { GIMP_PDB_STRING, "filename",     "The name of the file to load" },
+    { GIMP_PDB_STRING, "raw-filename", "The name entered"             }
+  };
+
+  static const GimpParamDef load_return_vals[] =
+  {
+    { GIMP_PDB_IMAGE, "image", "Output image" }
+  };
+
+  static const GimpParamDef save_args[] =
+  {
+    { GIMP_PDB_INT32,    "run-mode",     "The run mode { RUN-INTERACTIVE (0), RUN-NONINTERACTIVE (1) }" },
+    { GIMP_PDB_IMAGE,    "image",        "Input image"                  },
+    { GIMP_PDB_DRAWABLE, "drawable",     "Drawable to export"           },
+    { GIMP_PDB_STRING,   "filename",     "The name of the file to export the image in" },
+    { GIMP_PDB_STRING,   "raw-filename", "The name of the file to export the image in" },
+    { GIMP_PDB_INT32,    "rle",          "Use RLE compression"          },
+    { GIMP_PDB_INT32,    "origin",       "Image origin (0 = top-left, 1 = bottom-left)"}
+  } ;
+
+  gimp_install_procedure (LOAD_PROC,
+                          "Loads files of Targa file format",
+                          "FIXME: write help for tga_load",
+                          "Raphael FRANCOIS, Gordon Matzigkeit",
+                          "Raphael FRANCOIS, Gordon Matzigkeit",
+                          "1997,2000,2007",
+                          N_("TarGA image"),
+                          NULL,
+                          GIMP_PLUGIN,
+                          G_N_ELEMENTS (load_args),
+                          G_N_ELEMENTS (load_return_vals),
+                          load_args, load_return_vals);
+
+  gimp_register_file_handler_mime (LOAD_PROC, "image/x-tga");
+  gimp_register_magic_load_handler (LOAD_PROC,
+                                    "tga,vda,icb,vst",
+                                    "",
+                                    "-18&,string,TRUEVISION-XFILE.,-1,byte,0");
+
+  gimp_install_procedure (SAVE_PROC,
+                          "exports files in the Targa file format",
+                          "FIXME: write help for tga_save",
+                          "Raphael FRANCOIS, Gordon Matzigkeit",
+                          "Raphael FRANCOIS, Gordon Matzigkeit",
+                          "1997,2000",
+                          N_("TarGA image"),
+                          "RGB*, GRAY*, INDEXED*",
+                          GIMP_PLUGIN,
+                          G_N_ELEMENTS (save_args), 0,
+                          save_args, NULL);
+
+  gimp_register_file_handler_mime (SAVE_PROC, "image/x-tga");
+  gimp_register_save_handler (SAVE_PROC, "tga", "");
+}
+
+static void
+run (const gchar      *name,
+     gint              nparams,
+     const GimpParam  *param,
+     gint             *nreturn_vals,
+     GimpParam       **return_vals)
+{
+  static GimpParam   values[2];
+  GimpRunMode        run_mode;
+  GimpPDBStatusType  status = GIMP_PDB_SUCCESS;
+  gint32             image_ID;
+  gint32             drawable_ID;
+  GimpExportReturn   export = GIMP_EXPORT_CANCEL;
+  GError            *error  = NULL;
+
+#ifdef PROFILE
+  struct tms tbuf1, tbuf2;
+#endif
+
+  INIT_I18N ();
+  gegl_init (NULL, NULL);
+
+  run_mode = param[0].data.d_int32;
+
+  *nreturn_vals = 1;
+  *return_vals  = values;
+
+  values[0].type          = GIMP_PDB_STATUS;
+  values[0].data.d_status = GIMP_PDB_EXECUTION_ERROR;
+
+  if (strcmp (name, LOAD_PROC) == 0)
+    {
+#ifdef PROFILE
+      times (&tbuf1);
+#endif
+
+      image_ID = load_image (param[1].data.d_string, &error);
+
+      if (image_ID != -1)
+        {
+          *nreturn_vals = 2;
+          values[1].type         = GIMP_PDB_IMAGE;
+          values[1].data.d_image = image_ID;
+        }
+      else
+        {
+          status = GIMP_PDB_EXECUTION_ERROR;
+        }
+    }
+  else if (strcmp (name, SAVE_PROC) == 0)
+    {
+      gimp_ui_init (PLUG_IN_BINARY, FALSE);
+
+      image_ID     = param[1].data.d_int32;
+      drawable_ID  = param[2].data.d_int32;
+
+      /*  eventually export the image */
+      switch (run_mode)
+        {
+        case GIMP_RUN_INTERACTIVE:
+        case GIMP_RUN_WITH_LAST_VALS:
+          export = gimp_export_image (&image_ID, &drawable_ID, "TGA",
+                                      GIMP_EXPORT_CAN_HANDLE_RGB     |
+                                      GIMP_EXPORT_CAN_HANDLE_GRAY    |
+                                      GIMP_EXPORT_CAN_HANDLE_INDEXED |
+                                      GIMP_EXPORT_CAN_HANDLE_ALPHA);
+
+          if (export == GIMP_EXPORT_CANCEL)
+            {
+              values[0].data.d_status = GIMP_PDB_CANCEL;
+              return;
+            }
+          break;
+        default:
+          break;
+        }
+
+      switch (run_mode)
+        {
+        case GIMP_RUN_INTERACTIVE:
+          /*  Possibly retrieve data  */
+          gimp_get_data (SAVE_PROC, &tsvals);
+
+          /*  First acquire information with a dialog  */
+          if (! save_dialog ())
+            status = GIMP_PDB_CANCEL;
+          break;
+
+        case GIMP_RUN_NONINTERACTIVE:
+          /*  Make sure all the arguments are there!  */
+          if (nparams != 7)
+            {
+              status = GIMP_PDB_CALLING_ERROR;
+            }
+          else
+            {
+              tsvals.rle = (param[5].data.d_int32) ? TRUE : FALSE;
+            }
+          break;
+
+        case GIMP_RUN_WITH_LAST_VALS:
+          /*  Possibly retrieve data  */
+          gimp_get_data (SAVE_PROC, &tsvals);
+          break;
+
+        default:
+          break;
+        }
+
+#ifdef PROFILE
+      times (&tbuf1);
+#endif
+
+      if (status == GIMP_PDB_SUCCESS)
+        {
+          if (save_image (param[3].data.d_string, image_ID, drawable_ID,
+                          &error))
+            {
+              /*  Store psvals data  */
+              gimp_set_data (SAVE_PROC, &tsvals, sizeof (tsvals));
+            }
+          else
+            {
+              status = GIMP_PDB_EXECUTION_ERROR;
+            }
+        }
+
+      if (export == GIMP_EXPORT_EXPORT)
+        gimp_image_delete (image_ID);
+    }
+  else
+    {
+      status = GIMP_PDB_CALLING_ERROR;
+    }
+
+  if (status != GIMP_PDB_SUCCESS && error)
+    {
+      *nreturn_vals = 2;
+      values[1].type          = GIMP_PDB_STRING;
+      values[1].data.d_string = error->message;
+    }
+
+  values[0].data.d_status = status;
+
+#ifdef PROFILE
+  times (&tbuf2);
+  printf ("TGA: %s profile: %ld user %ld system\n", name,
+          (long) tbuf2.tms_utime - tbuf1.tms_utime,
+          (long) tbuf2.tms_stime - tbuf2.tms_stime);
+#endif
+}
+
+static gint32
+load_image (const gchar  *filename,
+            GError      **error)
+{
+  FILE     *fp;
+  tga_info  info;
+  guchar    header[18];
+  guchar    footer[26];
+  guchar    extension[495];
+  long      offset;
+  gint32    image_ID = -1;
+
+  gimp_progress_init_printf (_("Opening '%s'"),
+                             gimp_filename_to_utf8 (filename));
+
+  fp = g_fopen (filename, "rb");
+
+  if (! fp)
+    {
+      g_set_error (error, G_FILE_ERROR, g_file_error_from_errno (errno),
+                   _("Could not open '%s' for reading: %s"),
+                   gimp_filename_to_utf8 (filename), g_strerror (errno));
+      return -1;
+    }
+
+  /* Is file big enough for a footer? */
+  if (!fseek (fp, -26L, SEEK_END))
+    {
+      if (fread (footer, sizeof (footer), 1, fp) != 1)
+        {
+          g_message (_("Cannot read footer from '%s'"),
+                     gimp_filename_to_utf8 (filename));
+          fclose (fp);
+          return -1;
+        }
+      else if (memcmp (footer + 8, magic, sizeof (magic)) == 0)
+        {
+          /* Check the signature. */
+
+          offset = (footer[0]          +
+                    footer[1] * 256L   +
+                    footer[2] * 65536L +
+                    footer[3] * 16777216L);
+
+          if (offset != 0)
+            {
+              if (fseek (fp, offset, SEEK_SET) ||
+                  fread (extension, sizeof (extension), 1, fp) != 1)
+                {
+                  g_message (_("Cannot read extension from '%s'"),
+                             gimp_filename_to_utf8 (filename));
+                  fclose (fp);
+                  return -1;
+                }
+              /* Eventually actually handle version 2 TGA here */
+            }
+        }
+    }
+
+  if (fseek (fp, 0, SEEK_SET) ||
+      fread (header, sizeof (header), 1, fp) != 1)
+    {
+      g_message (_("Cannot read header from '%s'"),
+                 gimp_filename_to_utf8 (filename));
+      fclose (fp);
+      return -1;
+    }
+
+  switch (header[2])
+    {
+    case 1:
+      info.imageType        = TGA_TYPE_MAPPED;
+      info.imageCompression = TGA_COMP_NONE;
+      break;
+    case 2:
+      info.imageType        = TGA_TYPE_COLOR;
+      info.imageCompression = TGA_COMP_NONE;
+      break;
+    case 3:
+      info.imageType        = TGA_TYPE_GRAY;
+      info.imageCompression = TGA_COMP_NONE;
+      break;
+
+    case 9:
+      info.imageType        = TGA_TYPE_MAPPED;
+      info.imageCompression = TGA_COMP_RLE;
+      break;
+    case 10:
+      info.imageType        = TGA_TYPE_COLOR;
+      info.imageCompression = TGA_COMP_RLE;
+      break;
+    case 11:
+      info.imageType        = TGA_TYPE_GRAY;
+      info.imageCompression = TGA_COMP_RLE;
+      break;
+
+    default:
+      info.imageType = 0;
+    }
+
+  info.idLength     = header[0];
+  info.colorMapType = header[1];
+
+  info.colorMapIndex  = header[3] + header[4] * 256;
+  info.colorMapLength = header[5] + header[6] * 256;
+  info.colorMapSize   = header[7];
+
+  info.xOrigin = header[8]  + header[9] * 256;
+  info.yOrigin = header[10] + header[11] * 256;
+  info.width   = header[12] + header[13] * 256;
+  info.height  = header[14] + header[15] * 256;
+
+  info.bpp       = header[16];
+  info.bytes     = (info.bpp + 7) / 8;
+  info.alphaBits = header[17] & 0x0f; /* Just the low 4 bits */
+  info.flipHoriz = (header[17] & 0x10) ? 1 : 0;
+  info.flipVert  = (header[17] & 0x20) ? 0 : 1;
+
+  /* hack to handle some existing files with incorrect headers, see bug #306675 */
+  if (info.alphaBits == info.bpp)
+    info.alphaBits = 0;
+
+  /* hack to handle yet another flavor of incorrect headers, see bug #540969 */
+  if (info.alphaBits == 0)
+    {
+      if (info.imageType == TGA_TYPE_MAPPED && info.colorMapSize == 32)
+        info.alphaBits = 8;
+
+      if (info.imageType == TGA_TYPE_COLOR && info.bpp == 32)
+        info.alphaBits = 8;
+
+      if (info.imageType == TGA_TYPE_GRAY && info.bpp == 16)
+        info.alphaBits = 8;
+    }
+  else if (info.alphaBits == 4 && info.imageType == TGA_TYPE_COLOR && info.bpp == 32)
+    {
+      /* Incorrect TGA saved by Krita, see issue #9067*/
+      info.alphaBits = 8;
+    }
+
+  switch (info.imageType)
+    {
+      case TGA_TYPE_MAPPED:
+        if (info.bpp != 8)
+          {
+            g_message ("Unhandled sub-format in '%s' (type = %u, bpp = %u)",
+                       gimp_filename_to_utf8 (filename),
+                       info.imageType, info.bpp);
+            fclose (fp);
+            return -1;
+          }
+        break;
+      case TGA_TYPE_COLOR:
+        if ((info.bpp != 15 && info.bpp != 16 &&
+             info.bpp != 24 && info.bpp != 32)      ||
+            ((info.bpp == 15 || info.bpp == 24) &&
+             info.alphaBits != 0)                   ||
+            (info.bpp == 16 && info.alphaBits != 1 &&
+             info.alphaBits != 0)                   ||
+            (info.bpp == 32 && info.alphaBits != 8))
+          {
+            g_message ("Unhandled sub-format in '%s' (type = %u, bpp = %u, alpha = %u)",
+                       gimp_filename_to_utf8 (filename),
+                       info.imageType, info.bpp, info.alphaBits);
+            fclose (fp);
+            return -1;
+          }
+        break;
+      case TGA_TYPE_GRAY:
+        if (info.bpp != 8 &&
+            (info.alphaBits != 8 || (info.bpp != 16 && info.bpp != 15)))
+          {
+            g_message ("Unhandled sub-format in '%s' (type = %u, bpp = %u)",
+                       gimp_filename_to_utf8 (filename),
+                       info.imageType, info.bpp);
+            fclose (fp);
+            return -1;
+          }
+        break;
+
+      default:
+        g_message ("Unknown image type %u for '%s'",
+                   info.imageType, gimp_filename_to_utf8 (filename));
+        fclose (fp);
+        return -1;
+    }
+
+  /* Plausible but unhandled formats */
+  if (info.bytes * 8 != info.bpp && info.bpp != 15)
+    {
+      g_message ("Unhandled sub-format in '%s' (type = %u, bpp = %u)",
+                 gimp_filename_to_utf8 (filename),
+                 info.imageType, info.bpp);
+      fclose (fp);
+      return -1;
+    }
+
+  /* Check that we have a color map only when we need it. */
+  if (info.imageType == TGA_TYPE_MAPPED && info.colorMapType != 1)
+    {
+      g_message ("Indexed image has invalid color map type %u",
+                 info.colorMapType);
+      fclose (fp);
+      return -1;
+    }
+  else if (info.imageType != TGA_TYPE_MAPPED && info.colorMapType != 0)
+    {
+      g_message ("Non-indexed image has invalid color map type %u",
+                 info.colorMapType);
+      fclose (fp);
+      return -1;
+    }
+
+  /* Skip the image ID field. */
+  if (info.idLength && fseek (fp, info.idLength, SEEK_CUR))
+    {
+      g_message ("File '%s' is truncated or corrupted",
+                 gimp_filename_to_utf8 (filename));
+      fclose (fp);
+      return -1;
+    }
+
+  image_ID = ReadImage (fp, &info, filename);
+
+  fclose (fp);
+
+  return image_ID;
+}
+
+static void
+rle_write (FILE   *fp,
+           guchar *buf,
+           guint   width,
+           guint   bytes)
+{
+  gint    repeat = 0;
+  gint    direct = 0;
+  guchar *from   = buf;
+  guint   x;
+
+  for (x = 1; x < width; ++x)
+    {
+      if (memcmp (buf, buf + bytes, bytes))
+        {
+          /* next pixel is different */
+          if (repeat)
+            {
+              putc (128 + repeat, fp);
+              fwrite (from, bytes, 1, fp);
+              from = buf + bytes; /* point to first different pixel */
+              repeat = 0;
+              direct = 0;
+            }
+          else
+            {
+              direct += 1;
+            }
+        }
+      else
+        {
+          /* next pixel is the same */
+          if (direct)
+            {
+              putc (direct - 1, fp);
+              fwrite (from, bytes, direct, fp);
+              from = buf; /* point to first identical pixel */
+              direct = 0;
+              repeat = 1;
+            }
+          else
+            {
+              repeat += 1;
+            }
+        }
+
+      if (repeat == 128)
+        {
+          putc (255, fp);
+          fwrite (from, bytes, 1, fp);
+          from = buf + bytes;
+          direct = 0;
+          repeat = 0;
+        }
+      else if (direct == 128)
+        {
+          putc (127, fp);
+          fwrite (from, bytes, direct, fp);
+          from = buf+ bytes;
+          direct = 0;
+          repeat = 0;
+        }
+
+      buf += bytes;
+    }
+
+  if (repeat > 0)
+    {
+      putc (128 + repeat, fp);
+      fwrite (from, bytes, 1, fp);
+    }
+  else
+    {
+      putc (direct, fp);
+      fwrite (from, bytes, direct + 1, fp);
+    }
+}
+
+static gint
+rle_read (FILE     *fp,
+          guchar   *buf,
+          tga_info *info)
+{
+  static gint   repeat = 0;
+  static gint   direct = 0;
+  static guchar sample[4];
+  gint head;
+  gint x, k;
+
+  for (x = 0; x < info->width; x++)
+    {
+      if (repeat == 0 && direct == 0)
+        {
+          head = getc (fp);
+
+          if (head == EOF)
+            {
+              return EOF;
+            }
+          else if (head >= 128)
+            {
+              repeat = head - 127;
+
+              if (fread (sample, info->bytes, 1, fp) < 1)
+                return EOF;
+            }
+          else
+            {
+              direct = head + 1;
+            }
+        }
+
+      if (repeat > 0)
+        {
+          for (k = 0; k < info->bytes; ++k)
+            {
+              buf[k] = sample[k];
+            }
+
+          repeat--;
+        }
+      else /* direct > 0 */
+        {
+          if (fread (buf, info->bytes, 1, fp) < 1)
+            return EOF;
+
+          direct--;
+        }
+
+      buf += info->bytes;
+    }
+
+  return 0;
+}
+
+static void
+flip_line (guchar   *buf,
+           tga_info *info)
+{
+  guchar  temp;
+  guchar *alt;
+  gint    x, s;
+
+  alt = buf + (info->bytes * (info->width - 1));
+
+  for (x = 0; x * 2 < info->width; x++)
+    {
+      for (s = 0; s < info->bytes; ++s)
+        {
+          temp = buf[s];
+          buf[s] = alt[s];
+          alt[s] = temp;
+        }
+
+      buf += info->bytes;
+      alt -= info->bytes;
+    }
+}
+
+/* Some people write 16-bit RGB TGA files. The spec would probably
+   allow 27-bit RGB too, for what it's worth, but I won't fix that
+   unless someone actually provides an existence proof */
+
+static void
+upsample (guchar       *dest,
+          const guchar *src,
+          guint         width,
+          guint         bytes,
+          guint         alpha)
+{
+  guint x;
+
+  for (x = 0; x < width; x++)
+    {
+      dest[0] =  ((src[1] << 1) & 0xf8);
+      dest[0] += (dest[0] >> 5);
+
+      dest[1] =  ((src[0] & 0xe0) >> 2) + ((src[1] & 0x03) << 6);
+      dest[1] += (dest[1] >> 5);
+
+      dest[2] =  ((src[0] << 3) & 0xf8);
+      dest[2] += (dest[2] >> 5);
+
+      if (alpha)
+        {
+          dest[3] = (src[1] & 0x80) ? 255 : 0;
+          dest += 4;
+        }
+      else
+        {
+          dest += 3;
+        }
+
+      src += bytes;
+    }
+}
+
+static void
+bgr2rgb (guchar       *dest,
+         const guchar *src,
+         guint         width,
+         guint         bytes,
+         guint         alpha)
+{
+  guint x;
+
+  if (alpha)
+    {
+      for (x = 0; x < width; x++)
+        {
+          *(dest++) = src[2];
+          *(dest++) = src[1];
+          *(dest++) = src[0];
+          *(dest++) = src[3];
+
+          src += bytes;
+        }
+    }
+  else
+    {
+      for (x = 0; x < width; x++)
+        {
+          *(dest++) = src[2];
+          *(dest++) = src[1];
+          *(dest++) = src[0];
+
+          src += bytes;
+        }
+    }
+}
+
+static void
+apply_colormap (guchar       *dest,
+                const guchar *src,
+                guint         width,
+                const guchar *cmap,
+                gboolean      alpha,
+                guint16       index)
+{
+  guint x;
+
+  if (alpha)
+    {
+      for (x = 0; x < width; x++)
+        {
+          *(dest++) = cmap[(*src - index) * 4];
+          *(dest++) = cmap[(*src - index) * 4 + 1];
+          *(dest++) = cmap[(*src - index) * 4 + 2];
+          *(dest++) = cmap[(*src - index) * 4 + 3];
+
+          src++;
+        }
+    }
+  else
+    {
+      for (x = 0; x < width; x++)
+        {
+          *(dest++) = cmap[(*src - index) * 3];
+          *(dest++) = cmap[(*src - index) * 3 + 1];
+          *(dest++) = cmap[(*src - index) * 3 + 2];
+
+          src++;
+        }
+    }
+}
+
+static void
+apply_index (guchar       *dest,
+             const guchar *src,
+             guint         width,
+             guint16       index)
+{
+  guint x;
+
+  for (x = 0; x < width; x++)
+    {
+      *(dest++) = *(src++) - index;
+    }
+}
+
+static void
+read_line (FILE         *fp,
+           guchar       *row,
+           guchar       *buf,
+           tga_info     *info,
+           gint          bpp,
+           const guchar *convert_cmap)
+{
+  if (info->imageCompression == TGA_COMP_RLE)
+    {
+      rle_read (fp, buf, info);
+    }
+  else
+    {
+      fread (buf, info->bytes, info->width, fp);
+    }
+
+  if (info->flipHoriz)
+    {
+      flip_line (buf, info);
+    }
+
+  if (info->imageType == TGA_TYPE_COLOR)
+    {
+      if (info->bpp == 16 || info->bpp == 15)
+        {
+          upsample (row, buf, info->width, info->bytes, info->alphaBits);
+        }
+      else
+        {
+          bgr2rgb (row, buf, info->width, info->bytes, info->alphaBits);
+        }
+    }
+  else if (convert_cmap)
+    {
+      gboolean has_alpha = (info->alphaBits > 0);
+
+      apply_colormap (row, buf, info->width, convert_cmap, has_alpha,
+                      info->colorMapIndex);
+    }
+  else if (info->imageType == TGA_TYPE_MAPPED)
+    {
+      g_assert (bpp == 1);
+
+      apply_index (row, buf, info->width, info->colorMapIndex);
+    }
+  else
+    {
+      memcpy (row, buf, info->width * bpp);
+    }
+}
+
+static gint32
+ReadImage (FILE        *fp,
+           tga_info    *info,
+           const gchar *filename)
+{
+  static gint32      image_ID;
+  gint32             layer_ID;
+  GeglBuffer        *buffer;
+  guchar            *data, *buf, *row;
+  GimpImageType      dtype = 0;
+  GimpImageBaseType  itype = 0;
+  gint               bpp;
+  gint               i, y;
+  gint               max_tileheight, tileheight;
+  guint              cmap_bytes   = 0;
+  guchar            *tga_cmap     = NULL;
+  guchar            *gimp_cmap    = NULL;
+  guchar            *convert_cmap = NULL;
+
+  switch (info->imageType)
+    {
+    case TGA_TYPE_MAPPED:
+      cmap_bytes = (info->colorMapSize + 7 ) / 8;
+      tga_cmap = g_new (guchar, info->colorMapLength * cmap_bytes);
+
+      if (info->colorMapSize > 24)
+        {
+          /* indexed + full alpha => promoted to RGBA */
+          itype = GIMP_RGB;
+          dtype = GIMP_RGBA_IMAGE;
+          convert_cmap = g_new (guchar, info->colorMapLength * 4);
+        }
+      else if (info->colorMapIndex + info->colorMapLength > 256)
+        {
+          /* more than 256 colormap entries => promoted to RGB */
+          itype = GIMP_RGB;
+          dtype = GIMP_RGB_IMAGE;
+          convert_cmap = g_new (guchar, info->colorMapLength * 3);
+        }
+      else if (info->alphaBits > 0)
+        {
+          /* if alpha exists here, promote to RGB */
+          itype = GIMP_RGB;
+          dtype = GIMP_RGBA_IMAGE;
+          convert_cmap = g_new (guchar, info->colorMapLength * 4);
+        }
+      else
+        {
+          itype = GIMP_INDEXED;
+          dtype = GIMP_INDEXED_IMAGE;
+          gimp_cmap = g_new (guchar, info->colorMapLength * 3);
+        }
+      break;
+
+    case TGA_TYPE_GRAY:
+      itype = GIMP_GRAY;
+
+      if (info->alphaBits)
+        dtype = GIMP_GRAYA_IMAGE;
+      else
+        dtype = GIMP_GRAY_IMAGE;
+      break;
+
+    case TGA_TYPE_COLOR:
+      itype = GIMP_RGB;
+
+      if (info->alphaBits)
+        dtype = GIMP_RGBA_IMAGE;
+      else
+        dtype = GIMP_RGB_IMAGE;
+      break;
+    }
+
+  /* Handle colormap */
+
+  if (info->imageType == TGA_TYPE_MAPPED)
+    {
+      if (cmap_bytes <= 4 &&
+          fread (tga_cmap, info->colorMapLength * cmap_bytes, 1, fp) == 1)
+        {
+          if (convert_cmap)
+            {
+              if (info->colorMapSize == 32)
+                bgr2rgb (convert_cmap, tga_cmap,
+                         info->colorMapLength, cmap_bytes, 1);
+              else if (info->colorMapSize == 24)
+                bgr2rgb (convert_cmap, tga_cmap,
+                         info->colorMapLength, cmap_bytes, 0);
+              else if (info->colorMapSize == 16 || info->colorMapSize == 15)
+                upsample (convert_cmap, tga_cmap,
+                          info->colorMapLength, cmap_bytes, info->alphaBits);
+              else
+                {
+                  g_message ("Unsupported colormap depth: %u",
+                             info->colorMapSize);
+                  return -1;
+                }
+            }
+          else
+            {
+              if (info->colorMapSize == 24)
+                bgr2rgb (gimp_cmap, tga_cmap,
+                         info->colorMapLength, cmap_bytes, 0);
+              else if (info->colorMapSize == 16 || info->colorMapSize == 15)
+                upsample (gimp_cmap, tga_cmap,
+                          info->colorMapLength, cmap_bytes, info->alphaBits);
+              else
+                {
+                  g_message ("Unsupported colormap depth: %u",
+                             info->colorMapSize);
+                  return -1;
+                }
+            }
+        }
+      else
+        {
+          g_message ("File '%s' is truncated or corrupted",
+                     gimp_filename_to_utf8 (filename));
+          return -1;
+        }
+    }
+
+  image_ID = gimp_image_new (info->width, info->height, itype);
+  gimp_image_set_filename (image_ID, filename);
+
+  if (gimp_cmap)
+    gimp_image_set_colormap (image_ID, gimp_cmap, info->colorMapLength);
+
+  layer_ID = gimp_layer_new (image_ID,
+                             _("Background"),
+                             info->width, info->height,
+                             dtype,
+                             100,
+                             gimp_image_get_default_new_layer_mode (image_ID));
+
+  gimp_image_insert_layer (image_ID, layer_ID, -1, 0);
+
+  buffer = gimp_drawable_get_buffer (layer_ID);
+
+  bpp = gimp_drawable_bpp (layer_ID);
+
+  /* Allocate the data. */
+  max_tileheight = gimp_tile_height ();
+  data = g_new (guchar, info->width * max_tileheight * bpp);
+  buf  = g_new (guchar, info->width * info->bytes);
+
+  if (info->flipVert)
+    {
+      for (i = 0; i < info->height; i += tileheight)
+        {
+          tileheight = i ? max_tileheight : (info->height % max_tileheight);
+          if (tileheight == 0)
+            tileheight = max_tileheight;
+
+          for (y = 1; y <= tileheight; ++y)
+            {
+              row = data + (info->width * bpp * (tileheight - y));
+              read_line (fp, row, buf, info, bpp, convert_cmap);
+            }
+
+          gegl_buffer_set (buffer,
+                           GEGL_RECTANGLE (0, info->height - i - tileheight,
+                                           info->width, tileheight), 0,
+                           NULL, data, GEGL_AUTO_ROWSTRIDE);
+
+          gimp_progress_update ((gdouble) (i + tileheight) /
+                                (gdouble) info->height);
+        }
+    }
+  else
+    {
+      for (i = 0; i < info->height; i += max_tileheight)
+        {
+          tileheight = MIN (max_tileheight, info->height - i);
+
+          for (y = 0; y < tileheight; ++y)
+            {
+              row= data + (info->width * bpp * y);
+              read_line (fp, row, buf, info, bpp, convert_cmap);
+            }
+
+          gegl_buffer_set (buffer,
+                           GEGL_RECTANGLE (0, i, info->width, tileheight), 0,
+                           NULL, data, GEGL_AUTO_ROWSTRIDE);
+
+          gimp_progress_update ((gdouble) (i + tileheight) /
+                                (gdouble) info->height);
+        }
+    }
+
+  g_free (data);
+  g_free (buf);
+
+  g_free (convert_cmap);
+  g_free (gimp_cmap);
+  g_free (tga_cmap);
+
+  g_object_unref (buffer);
+
+  gimp_progress_update (1.0);
+
+  return image_ID;
+}
+
+
+static gboolean
+save_image (const gchar  *filename,
+            gint32        image_ID,
+            gint32        drawable_ID,
+            GError      **error)
+{
+  GeglBuffer    *buffer;
+  const Babl    *format = NULL;
+  GimpImageType  dtype;
+  gint           width;
+  gint           height;
+  FILE          *fp;
+  gint           out_bpp = 0;
+  gboolean       status  = TRUE;
+  gint           i, row;
+  guchar         header[18];
+  guchar         footer[26];
+  guchar        *pixels;
+  guchar        *data;
+  gint           num_colors;
+  guchar        *gimp_cmap = NULL;
+
+  buffer = gimp_drawable_get_buffer (drawable_ID);
+
+  dtype = gimp_drawable_type (drawable_ID);
+
+  width  = gegl_buffer_get_width  (buffer);
+  height = gegl_buffer_get_height (buffer);
+
+  gimp_progress_init_printf (_("Exporting '%s'"),
+                             gimp_filename_to_utf8 (filename));
+
+  if ((fp = g_fopen (filename, "wb")) == NULL)
+    {
+      g_set_error (error, G_FILE_ERROR, g_file_error_from_errno (errno),
+                   _("Could not open '%s' for writing: %s"),
+                   gimp_filename_to_utf8 (filename), g_strerror (errno));
+      return FALSE;
+    }
+
+  header[0] = 0; /* No image identifier / description */
+
+  if (dtype == GIMP_INDEXED_IMAGE)
+    {
+      gimp_cmap = gimp_image_get_colormap (image_ID, &num_colors);
+
+      header[1] = 1; /* cmap type */
+      header[2] = (tsvals.rle) ? 9 : 1;
+      header[3] = header[4] = 0; /* no offset */
+      header[5] = num_colors % 256;
+      header[6] = num_colors / 256;
+      header[7] = 24; /* cmap size / bits */
+    }
+  else if (dtype == GIMP_INDEXEDA_IMAGE)
+    {
+      gimp_cmap = gimp_image_get_colormap (image_ID, &num_colors);
+
+      header[1] = 1; /* cmap type */
+      header[2] = (tsvals.rle) ? 9 : 1;
+      header[3] = header[4] = 0; /* no offset */
+      header[5] = (num_colors + 1) % 256;
+      header[6] = (num_colors + 1) / 256;
+      header[7] = 32; /* cmap size / bits */
+    }
+  else
+    {
+      header[1]= 0;
+
+      if (dtype == GIMP_RGB_IMAGE || dtype == GIMP_RGBA_IMAGE)
+        {
+          header[2]= (tsvals.rle) ? 10 : 2;
+        }
+      else
+        {
+          header[2]= (tsvals.rle) ? 11 : 3;
+        }
+
+      header[3] = header[4] = header[5] = header[6] = header[7] = 0;
+    }
+
+  header[8]  = header[9] = 0;                           /* xorigin */
+  header[10] = tsvals.origin ? 0 : (height % 256);      /* yorigin */
+  header[11] = tsvals.origin ? 0 : (height / 256);      /* yorigin */
+
+
+  header[12] = width % 256;
+  header[13] = width / 256;
+
+  header[14] = height % 256;
+  header[15] = height / 256;
+
+  switch (dtype)
+    {
+    case GIMP_INDEXED_IMAGE:
+    case GIMP_INDEXEDA_IMAGE:
+      format  = NULL;
+      out_bpp = 1;
+      header[16] = 8; /* bpp */
+      header[17] = tsvals.origin ? 0 : 0x20; /* alpha + orientation */
+      break;
+
+    case GIMP_GRAY_IMAGE:
+      format  = babl_format ("Y' u8");
+      out_bpp = 1;
+      header[16] = 8; /* bpp */
+      header[17] = tsvals.origin ? 0 : 0x20; /* alpha + orientation */
+      break;
+
+    case GIMP_GRAYA_IMAGE:
+      format  = babl_format ("Y'A u8");
+      out_bpp = 2;
+      header[16] = 16; /* bpp */
+      header[17] = tsvals.origin ? 8 : 0x28; /* alpha + orientation */
+      break;
+
+    case GIMP_RGB_IMAGE:
+      format  = babl_format ("R'G'B' u8");
+      out_bpp = 3;
+      header[16] = 24; /* bpp */
+      header[17] = tsvals.origin ? 0 : 0x20; /* alpha + orientation */
+      break;
+
+    case GIMP_RGBA_IMAGE:
+      format  = babl_format ("R'G'B'A u8");
+      out_bpp = 4;
+      header[16] = 32; /* bpp */
+      header[17] = tsvals.origin ? 8 : 0x28; /* alpha + orientation */
+      break;
+    }
+
+  /* write header to front of file */
+  fwrite (header, sizeof (header), 1, fp);
+
+  if (dtype == GIMP_INDEXED_IMAGE)
+    {
+      /* write out palette */
+      for (i = 0; i < num_colors; ++i)
+        {
+          fputc (gimp_cmap[(i * 3) + 2], fp);
+          fputc (gimp_cmap[(i * 3) + 1], fp);
+          fputc (gimp_cmap[(i * 3) + 0], fp);
+        }
+    }
+  else if (dtype == GIMP_INDEXEDA_IMAGE)
+    {
+      /* write out palette */
+      for (i = 0; i < num_colors; ++i)
+        {
+          fputc (gimp_cmap[(i * 3) + 2], fp);
+          fputc (gimp_cmap[(i * 3) + 1], fp);
+          fputc (gimp_cmap[(i * 3) + 0], fp);
+          fputc (255, fp);
+        }
+
+      fputc (0, fp);
+      fputc (0, fp);
+      fputc (0, fp);
+      fputc (0, fp);
+    }
+
+  if (dtype == GIMP_INDEXEDA_IMAGE)
+    pixels = g_new (guchar, width * 2);
+  else
+    pixels = g_new (guchar, width * out_bpp);
+  data   = g_new (guchar, width * out_bpp);
+
+  for (row = 0; row < height; ++row)
+    {
+      if (tsvals.origin)
+        {
+          gegl_buffer_get (buffer,
+                           GEGL_RECTANGLE (0, height - (row + 1), width, 1), 1.0,
+                           format, pixels,
+                           GEGL_AUTO_ROWSTRIDE, GEGL_ABYSS_NONE);
+        }
+      else
+        {
+          gegl_buffer_get (buffer,
+                           GEGL_RECTANGLE (0, row, width, 1), 1.0,
+                           format, pixels,
+                           GEGL_AUTO_ROWSTRIDE, GEGL_ABYSS_NONE);
+        }
+
+      if (dtype == GIMP_RGB_IMAGE)
+        {
+          bgr2rgb (data, pixels, width, out_bpp, 0);
+        }
+      else if (dtype == GIMP_RGBA_IMAGE)
+        {
+          bgr2rgb (data, pixels, width, out_bpp, 1);
+        }
+      else if (dtype == GIMP_INDEXEDA_IMAGE)
+        {
+          for (i = 0; i < width; ++i)
+            {
+              if (pixels[i * 2 + 1] > 127)
+                data[i] = pixels[i * 2];
+              else
+                data[i] = num_colors;
+            }
+        }
+      else
+        {
+          memcpy (data, pixels, width * out_bpp);
+        }
+
+      if (tsvals.rle)
+        {
+          rle_write (fp, data, width, out_bpp);
+        }
+      else
+        {
+          fwrite (data, width * out_bpp, 1, fp);
+        }
+
+      if (row % 16 == 0)
+        gimp_progress_update ((gdouble) row / (gdouble) height);
+    }
+
+  g_object_unref (buffer);
+
+  g_free (data);
+  g_free (pixels);
+
+  /* footer must be the last thing written to file */
+  memset (footer, 0, 8); /* No extensions, no developer directory */
+  memcpy (footer + 8, magic, sizeof (magic)); /* magic signature */
+  fwrite (footer, sizeof (footer), 1, fp);
+
+  fclose (fp);
+
+  gimp_progress_update (1.0);
+
+  return status;
+}
+
+static gboolean
+save_dialog (void)
+{
+  GtkWidget *dialog;
+  GtkWidget *label;
+  GtkWidget *toggle;
+  GtkWidget *combo;
+  GtkWidget *vbox;
+  GtkWidget *hbox;
+  gboolean   run;
+
+  dialog = gimp_export_dialog_new (_("TGA"), PLUG_IN_BINARY, SAVE_PROC);
+
+  vbox = gtk_box_new (GTK_ORIENTATION_VERTICAL, 12);
+  gtk_container_set_border_width (GTK_CONTAINER (vbox), 12);
+  gtk_box_pack_start (GTK_BOX (gimp_export_dialog_get_content_area (dialog)),
+                      vbox, TRUE, TRUE, 0);
+  gtk_widget_show (vbox);
+
+  /*  rle  */
+  toggle = gtk_check_button_new_with_mnemonic (_("_RLE compression"));
+  gtk_box_pack_start (GTK_BOX (vbox), toggle, FALSE, FALSE, 0);
+  gtk_toggle_button_set_active (GTK_TOGGLE_BUTTON (toggle), tsvals.rle);
+  gtk_widget_show (toggle);
+
+  g_signal_connect (toggle, "toggled",
+                    G_CALLBACK (gimp_toggle_button_update),
+                    &tsvals.rle);
+
+  /*  origin  */
+  hbox = gtk_box_new (GTK_ORIENTATION_HORIZONTAL, 6);
+  gtk_box_pack_start (GTK_BOX (vbox), hbox, FALSE, FALSE, 0);
+  gtk_widget_show (hbox);
+
+  label = gtk_label_new_with_mnemonic (_("Or_igin:"));
+  gtk_box_pack_start (GTK_BOX (hbox), label, FALSE, FALSE, 0);
+  gtk_widget_show (label);
+
+  combo = gimp_int_combo_box_new (_("Bottom left"), ORIGIN_BOTTOM_LEFT,
+                                  _("Top left"),    ORIGIN_TOP_LEFT,
+                                  NULL);
+  gtk_box_pack_start (GTK_BOX (hbox), combo, TRUE, TRUE, 0);
+  gtk_widget_show (combo);
+
+  gtk_label_set_mnemonic_widget (GTK_LABEL (label), combo);
+
+  gimp_int_combo_box_connect (GIMP_INT_COMBO_BOX (combo),
+                              tsvals.origin,
+                              G_CALLBACK (gimp_int_combo_box_get_active),
+                              &tsvals.origin);
+
+  gtk_widget_show (dialog);
+
+  run = (gimp_dialog_run (GIMP_DIALOG (dialog)) == GTK_RESPONSE_OK);
+
+  gtk_widget_destroy (dialog);
+
+  return run;
+}