/* -*- Mode: C; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 8 -*- */ /* GdkPixbuf library - TIFF image loader * * Copyright (C) 1999 Mark Crichton * Copyright (C) 1999 The Free Software Foundation * * Authors: Mark Crichton * Federico Mena-Quintero * Jonathan Blandford * Søren Sandmann * * This library is free software; you can redistribute it and/or * modify it under the terms of the GNU Lesser General Public * License as published by the Free Software Foundation; either * version 2 of the License, or (at your option) any later version. * * This library 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 * Lesser General Public License for more details. * * You should have received a copy of the GNU Lesser General Public * License along with this library; if not, write to the * Free Software Foundation, Inc., 59 Temple Place - Suite 330, * Boston, MA 02111-1307, USA. */ /* Following code (almost) blatantly ripped from Imlib */ #include #include #include #ifdef HAVE_UNISTD_H #include #endif #include #include #include "gdk-pixbuf-private.h" #include "gdk-pixbuf-io.h" #ifdef G_OS_WIN32 #include #define O_RDWR _O_RDWR #endif typedef struct _TiffContext TiffContext; struct _TiffContext { ModulePreparedNotifyFunc prepare_func; ModuleUpdatedNotifyFunc update_func; gpointer user_data; guchar *buffer; guint allocated; guint used; guint pos; }; /* There's no user data for the error handlers, so we just have to * put a big-ass lock on the whole TIFF loader */ G_LOCK_DEFINE_STATIC (tiff_loader); static char *global_error = NULL; static TIFFErrorHandler orig_error_handler = NULL; static TIFFErrorHandler orig_warning_handler = NULL; static void tiff_warning_handler (const char *mod, const char *fmt, va_list ap) { /* Don't print anything; we should not be dumping junk to * stderr, since that may be bad for some apps. */ /* libTIFF seems to occasionally warn about things that * are really errors, so maybe we should just call tiff_error_handler * here. */ } static void tiff_error_handler (const char *mod, const char *fmt, va_list ap) { if (global_error) { /* Blah, loader called us twice */ return; } global_error = g_strdup_vprintf (fmt, ap); } static void tiff_push_handlers (void) { if (global_error) g_warning ("TIFF loader left crufty global_error around, FIXME"); orig_error_handler = TIFFSetErrorHandler (tiff_error_handler); orig_warning_handler = TIFFSetWarningHandler (tiff_warning_handler); } static void tiff_pop_handlers (void) { if (global_error) g_warning ("TIFF loader left crufty global_error around, FIXME"); TIFFSetErrorHandler (orig_error_handler); TIFFSetWarningHandler (orig_warning_handler); } static void tiff_set_error (GError **error, int error_code, const char *msg) { /* Take the error message from libtiff and merge it with * some context we provide. */ g_set_error (error, GDK_PIXBUF_ERROR, error_code, "%s%s%s", msg, global_error ? ": " : "", global_error); if (global_error) { g_free (global_error); global_error = NULL; } } static GdkPixbuf * tiff_image_parse (TIFF *tiff, TiffContext *context, GError **error) { guchar *pixels = NULL; guchar *tmppix; uint32 *rast, *tmp_rast; gint w, h, x, y, num_pixs; GdkPixbuf *pixbuf; /* We're called with the lock held. */ g_return_val_if_fail (global_error == NULL, NULL); if (!TIFFGetField (tiff, TIFFTAG_IMAGEWIDTH, &w) || global_error) { tiff_set_error (error, GDK_PIXBUF_ERROR_FAILED, _("Could not get image width (bad TIFF file)")); return NULL; } if (!TIFFGetField (tiff, TIFFTAG_IMAGELENGTH, &h) || global_error) { tiff_set_error (error, GDK_PIXBUF_ERROR_FAILED, _("Could not get image height (bad TIFF file)")); return NULL; } num_pixs = w * h; if (num_pixs == 0) { g_set_error (error, GDK_PIXBUF_ERROR, GDK_PIXBUF_ERROR_CORRUPT_IMAGE, _("Width or height of TIFF image is zero")); return NULL; } pixbuf = gdk_pixbuf_new (GDK_COLORSPACE_RGB, TRUE, 8, w, h); if (!pixbuf) { g_set_error (error, GDK_PIXBUF_ERROR, GDK_PIXBUF_ERROR_INSUFFICIENT_MEMORY, _("Insufficient memory to open TIFF file")); return NULL; } G_UNLOCK (tiff_loader); if (context) (* context->prepare_func) (pixbuf, NULL, context->user_data); G_LOCK (tiff_loader); /* Yes, it needs to be _TIFFMalloc... */ rast = (uint32 *) _TIFFmalloc (num_pixs * sizeof (uint32)); if (!rast) { g_set_error (error, GDK_PIXBUF_ERROR, GDK_PIXBUF_ERROR_INSUFFICIENT_MEMORY, _("Insufficient memory to open TIFF file")); return NULL; } if (!TIFFReadRGBAImage (tiff, w, h, rast, 0) || global_error) { tiff_set_error (error, GDK_PIXBUF_ERROR_FAILED, _("Failed to load RGB data from TIFF file")); _TIFFfree (rast); return NULL; } pixels = gdk_pixbuf_get_pixels (pixbuf); g_assert (pixels); tmppix = pixels; for (y = 0; y < h; y++) { /* Unexplainable...are tiffs backwards? */ /* Also looking at the GIMP plugin, this * whole reading thing can be a bit more * robust. */ tmp_rast = rast + ((h - y - 1) * w); for (x = 0; x < w; x++) { tmppix[0] = TIFFGetR (*tmp_rast); tmppix[1] = TIFFGetG (*tmp_rast); tmppix[2] = TIFFGetB (*tmp_rast); tmppix[3] = TIFFGetA (*tmp_rast); tmp_rast++; tmppix += 4; } } _TIFFfree (rast); G_UNLOCK (tiff_loader); if (context) (* context->update_func) (pixbuf, 0, 0, w, h, context->user_data); G_LOCK (tiff_loader); return pixbuf; } /* Static loader */ static GdkPixbuf * gdk_pixbuf__tiff_image_load (FILE *f, GError **error) { TIFF *tiff; int fd; GdkPixbuf *pixbuf; g_return_val_if_fail (f != NULL, NULL); G_LOCK (tiff_loader); tiff_push_handlers (); fd = fileno (f); tiff = TIFFFdOpen (fd, "libpixbuf-tiff", "r"); if (!tiff) { g_set_error (error, GDK_PIXBUF_ERROR, GDK_PIXBUF_ERROR_CORRUPT_IMAGE, _("Failed to open TIFF image")); tiff_pop_handlers (); G_UNLOCK (tiff_loader); return NULL; } pixbuf = tiff_image_parse (tiff, NULL, error); TIFFClose (tiff); if (global_error) { tiff_set_error (error, GDK_PIXBUF_ERROR_FAILED, _("TIFFClose operation failed")); } tiff_pop_handlers (); G_UNLOCK (tiff_loader); return pixbuf; } /* Progressive loader */ static gpointer gdk_pixbuf__tiff_image_begin_load (ModulePreparedNotifyFunc prepare_func, ModuleUpdatedNotifyFunc update_func, gpointer user_data, GError **error) { TiffContext *context; context = g_new0 (TiffContext, 1); context->prepare_func = prepare_func; context->update_func = update_func; context->user_data = user_data; context->buffer = NULL; context->allocated = 0; context->used = 0; context->pos = 0; return context; } static tsize_t tiff_read (thandle_t handle, tdata_t buf, tsize_t size) { TiffContext *context = (TiffContext *)handle; if (context->pos + size > context->used) return 0; memcpy (buf, context->buffer + context->pos, size); context->pos += size; return size; } static tsize_t tiff_write (thandle_t handle, tdata_t buf, tsize_t size) { return -1; } static toff_t tiff_seek (thandle_t handle, toff_t offset, int whence) { TiffContext *context = (TiffContext *)handle; switch (whence) { case SEEK_SET: if (offset > context->used || offset < 0) return -1; context->pos = offset; break; case SEEK_CUR: if (offset + context->pos >= context->used) return -1; context->pos += offset; break; case SEEK_END: if (offset + context->used > context->used) return -1; context->pos = context->used + offset; break; default: return -1; break; } return context->pos; } static int tiff_close (thandle_t context) { return 0; } static toff_t tiff_size (thandle_t handle) { TiffContext *context = (TiffContext *)handle; return context->used; } static int tiff_map_file (thandle_t handle, tdata_t *buf, toff_t *size) { TiffContext *context = (TiffContext *)handle; *buf = context->buffer; *size = context->used; return 0; } static void tiff_unmap_file (thandle_t handle, tdata_t data, toff_t offset) { } static gboolean gdk_pixbuf__tiff_image_stop_load (gpointer data, GError **error) { TiffContext *context = data; TIFF *tiff; gboolean retval; g_return_val_if_fail (data != NULL, FALSE); G_LOCK (tiff_loader); tiff_push_handlers (); tiff = TIFFClientOpen ("libtiff-pixbuf", "r", data, tiff_read, tiff_write, tiff_seek, tiff_close, tiff_size, tiff_map_file, tiff_unmap_file); if (!tiff) { g_set_error (error, GDK_PIXBUF_ERROR, GDK_PIXBUF_ERROR_FAILED, _("Failed to load TIFF image")); retval = FALSE; } else { GdkPixbuf *pixbuf; pixbuf = tiff_image_parse (tiff, context, error); if (pixbuf) g_object_unref (G_OBJECT (pixbuf)); retval = pixbuf != NULL; TIFFClose (tiff); } if (global_error) g_warning ("Error left set in TIFF loader\n"); g_free (context->buffer); g_free (context); tiff_pop_handlers (); G_UNLOCK (tiff_loader); return retval; } static gboolean make_available_at_least (TiffContext *context, guint needed) { guchar *new_buffer = NULL; guint need_alloc; need_alloc = context->used + needed; if (need_alloc > context->allocated) { guint new_size = 1; while (new_size < need_alloc) new_size *= 2; new_buffer = g_try_realloc (context->buffer, new_size); if (new_buffer) { context->buffer = new_buffer; context->allocated = new_size; return TRUE; } return FALSE; } return TRUE; } static gboolean gdk_pixbuf__tiff_image_load_increment (gpointer data, const guchar *buf, guint size, GError **error) { TiffContext *context = (TiffContext *) data; g_return_val_if_fail (data != NULL, FALSE); if (!make_available_at_least (context, size)) { g_set_error (error, GDK_PIXBUF_ERROR, GDK_PIXBUF_ERROR_INSUFFICIENT_MEMORY, _("Insufficient memory to open TIFF file")); return FALSE; } memcpy (context->buffer + context->used, buf, size); context->used += size; return TRUE; } void gdk_pixbuf__tiff_fill_vtable (GdkPixbufModule *module) { module->load = gdk_pixbuf__tiff_image_load; module->begin_load = gdk_pixbuf__tiff_image_begin_load; module->stop_load = gdk_pixbuf__tiff_image_stop_load; module->load_increment = gdk_pixbuf__tiff_image_load_increment; }