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314 lines
9.1 KiB
C
314 lines
9.1 KiB
C
/* JPEG 2000 loader
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*
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* Copyright (c) 2007 Bastien Nocera <hadess@hadess.net>
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* Inspired by work by Ben Karel <web+moz@eschew.org>
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this library; if not, write to the
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* Free Software Foundation, Inc., 59 Temple Place - Suite 330,
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* Boston, MA 02111-1307, USA.
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*/
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#include <stdlib.h>
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#include <string.h>
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#include <errno.h>
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#include "gdk-pixbuf-private.h"
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#include "gdk-pixbuf-io.h"
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#include <jasper/jasper.h>
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G_MODULE_EXPORT void fill_vtable (GdkPixbufModule * module);
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G_MODULE_EXPORT void fill_info (GdkPixbufFormat * info);
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struct jasper_context {
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GdkPixbuf *pixbuf;
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GdkPixbufModuleSizeFunc size_func;
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GdkPixbufModuleUpdatedFunc updated_func;
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GdkPixbufModulePreparedFunc prepared_func;
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gpointer user_data;
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jas_stream_t *stream;
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int width, height;
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};
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static void
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free_jasper_context (struct jasper_context *context)
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{
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if (!context)
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return;
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if (context->stream) {
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jas_stream_close (context->stream);
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context->stream = NULL;
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}
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g_free (context);
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}
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static gpointer
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jasper_image_begin_load (GdkPixbufModuleSizeFunc size_func,
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GdkPixbufModulePreparedFunc prepared_func,
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GdkPixbufModuleUpdatedFunc updated_func,
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gpointer user_data, GError **error)
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{
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struct jasper_context *context;
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jas_stream_t *stream;
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jas_init ();
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stream = jas_stream_memopen (NULL, -1);
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if (!stream) {
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g_set_error_literal (error, GDK_PIXBUF_ERROR, GDK_PIXBUF_ERROR_INSUFFICIENT_MEMORY,
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_("Couldn't allocate memory for stream"));
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return NULL;
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}
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context = g_new0 (struct jasper_context, 1);
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if (!context)
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return NULL;
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context->size_func = size_func;
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context->updated_func = updated_func;
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context->prepared_func = prepared_func;
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context->user_data = user_data;
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context->width = context->height = -1;
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context->stream = stream;
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return context;
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}
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static gboolean
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jasper_image_try_load (struct jasper_context *context, GError **error)
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{
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jas_image_t *raw_image, *image;
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int num_components, colourspace_family;
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int i, rowstride, shift;
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guchar *pixels;
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raw_image = jas_image_decode (context->stream, -1, 0);
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if (!raw_image) {
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g_set_error_literal (error, GDK_PIXBUF_ERROR, GDK_PIXBUF_ERROR_CORRUPT_IMAGE,
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_("Couldn't decode image"));
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return FALSE;
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}
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if (context->width == -1 && context->height == -1) {
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int width, height;
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context->width = width = jas_image_cmptwidth (raw_image, 0);
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context->height = height = jas_image_cmptheight (raw_image, 0);
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if (context->size_func) {
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(*context->size_func) (&width, &height, context->user_data);
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if (width == 0 || height == 0) {
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jas_image_destroy(raw_image);
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g_set_error_literal (error,
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GDK_PIXBUF_ERROR,
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GDK_PIXBUF_ERROR_CORRUPT_IMAGE,
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_("Transformed JPEG2000 has zero width or height"));
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return FALSE;
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}
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}
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}
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/* We only know how to handle grayscale and RGB images */
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num_components = jas_image_numcmpts (raw_image);
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colourspace_family = jas_clrspc_fam (jas_image_clrspc (raw_image));
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if ((num_components != 3 && num_components != 4 && num_components != 1) ||
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(colourspace_family != JAS_CLRSPC_FAM_RGB && colourspace_family != JAS_CLRSPC_FAM_GRAY)) {
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jas_image_destroy (raw_image);
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g_set_error_literal (error, GDK_PIXBUF_ERROR, GDK_PIXBUF_ERROR_UNKNOWN_TYPE,
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_("Image type currently not supported"));
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return FALSE;
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}
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/* Apply the colour profile to the image, creating a new one */
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if (jas_image_clrspc (raw_image) != JAS_CLRSPC_SRGB) {
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jas_cmprof_t *profile;
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profile = jas_cmprof_createfromclrspc (JAS_CLRSPC_SRGB);
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if (!profile) {
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jas_image_destroy (raw_image);
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g_set_error_literal (error, GDK_PIXBUF_ERROR, GDK_PIXBUF_ERROR_INSUFFICIENT_MEMORY,
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_("Couldn't allocate memory for color profile"));
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return FALSE;
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}
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image = jas_image_chclrspc (raw_image, profile, JAS_CMXFORM_INTENT_PER);
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if (!image) {
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jas_image_destroy (raw_image);
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g_set_error_literal (error, GDK_PIXBUF_ERROR, GDK_PIXBUF_ERROR_INSUFFICIENT_MEMORY,
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_("Couldn't allocate memory for color profile"));
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return FALSE;
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}
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} else {
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image = raw_image;
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}
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if (!context->pixbuf) {
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int bits_per_sample;
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/* Unfortunately, gdk-pixbuf doesn't support 16 bpp images
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* bits_per_sample = jas_image_cmptprec (image, 0);
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if (bits_per_sample < 8)
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bits_per_sample = 8;
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else if (bits_per_sample > 8)
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bits_per_sample = 16;
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*/
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bits_per_sample = 8;
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context->pixbuf = gdk_pixbuf_new (GDK_COLORSPACE_RGB,
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FALSE, bits_per_sample,
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context->width, context->height);
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if (context->pixbuf == NULL) {
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g_set_error_literal (error,
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GDK_PIXBUF_ERROR,
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GDK_PIXBUF_ERROR_INSUFFICIENT_MEMORY,
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_("Insufficient memory to open JPEG 2000 file"));
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return FALSE;
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}
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if (context->prepared_func)
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context->prepared_func (context->pixbuf, NULL, context->user_data);
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}
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/* We calculate how much we should shift the pixel
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* data by to make it fit into our pixbuf */
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shift = MAX (jas_image_cmptprec (image, 0) - gdk_pixbuf_get_bits_per_sample (context->pixbuf), 0);
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/* Loop over the 3 colourspaces */
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rowstride = gdk_pixbuf_get_rowstride (context->pixbuf);
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pixels = gdk_pixbuf_get_pixels (context->pixbuf);
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for (i = 0; i < num_components; i++) {
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jas_matrix_t *matrix;
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int j;
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matrix = jas_matrix_create (context->height, context->width);
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/* in libjasper, R is 0, G is 1, etc. we're lucky :)
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* but we need to handle the "opacity" channel ourselves */
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if (i != 4) {
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jas_image_readcmpt (image, i, 0, 0, context->width, context->height, matrix);
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} else {
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jas_image_readcmpt (image, JAS_IMAGE_CT_OPACITY, 0, 0, context->width, context->height, matrix);
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}
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for (j = 0; j < context->height; j++) {
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int k;
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for (k = 0; k < context->width; k++) {
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if (num_components == 3 || num_components == 4) {
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pixels[j * rowstride + k * 3 + i] = jas_matrix_get (matrix, j, k) >> shift;
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} else {
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pixels[j * rowstride + k * 3] =
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pixels[j * rowstride + k * 3 + 1] =
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pixels[j * rowstride + k * 3 + 2] = jas_matrix_get (matrix, j, k) >> shift;
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}
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}
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/* Update once per line for the last component, otherwise
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* we might contain garbage */
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if (context->updated_func && (i == num_components - 1) && k != 0) {
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context->updated_func (context->pixbuf, 0, j, k, 1, context->user_data);
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}
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}
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jas_matrix_destroy (matrix);
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}
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if (image != raw_image)
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jas_image_destroy (image);
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jas_image_destroy (raw_image);
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return TRUE;
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}
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static gboolean
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jasper_image_stop_load (gpointer data, GError **error)
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{
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struct jasper_context *context = (struct jasper_context *) data;
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gboolean ret;
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jas_stream_rewind (context->stream);
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ret = jasper_image_try_load (context, error);
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free_jasper_context (context);
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return ret;
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}
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static gboolean
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jasper_image_load_increment (gpointer data, const guchar *buf, guint size, GError **error)
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{
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struct jasper_context *context = (struct jasper_context *) data;
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if (jas_stream_write (context->stream, buf, size) < 0) {
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g_set_error_literal (error, GDK_PIXBUF_ERROR, GDK_PIXBUF_ERROR_INSUFFICIENT_MEMORY,
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_("Couldn't allocate memory to buffer image data"));
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return FALSE;
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}
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return TRUE;
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}
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#ifndef INCLUDE_jasper
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#define MODULE_ENTRY(function) G_MODULE_EXPORT void function
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#else
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#define MODULE_ENTRY(function) void _gdk_pixbuf__jasper_ ## function
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#endif
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MODULE_ENTRY (fill_vtable) (GdkPixbufModule * module)
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{
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module->begin_load = jasper_image_begin_load;
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module->stop_load = jasper_image_stop_load;
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module->load_increment = jasper_image_load_increment;
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}
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MODULE_ENTRY (fill_info) (GdkPixbufFormat * info)
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{
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static GdkPixbufModulePattern signature[] = {
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{ " jP", "!!!! ", 100 }, /* file begins with 'jP' at offset 4 */
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{ "\xff\x4f\xff\x51\x00", NULL, 100 }, /* file starts with FF 4F FF 51 00 */
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{ NULL, NULL, 0 }
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};
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static gchar *mime_types[] = {
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"image/jp2",
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"image/jpeg2000",
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"image/jpx",
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NULL
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};
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static gchar *extensions[] = {
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"jp2",
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"jpc",
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"jpx",
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"j2k",
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"jpf",
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NULL
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};
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info->name = "jpeg2000";
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info->signature = signature;
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info->description = N_("The JPEG 2000 image format");
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info->mime_types = mime_types;
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info->extensions = extensions;
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info->flags = GDK_PIXBUF_FORMAT_THREADSAFE;
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info->license = "LGPL";
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info->disabled = FALSE;
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}
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