-/* GdkPixbuf library - JPEG image loader
+/* -*- Mode: C; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 8 -*- */
+/* GdkPixbuf library - PNG image loader
*
* Copyright (C) 1999 Mark Crichton
* Copyright (C) 1999 The Free Software Foundation
* Federico Mena-Quintero <federico@gimp.org>
*
* This library is free software; you can redistribute it and/or
- * modify it under the terms of the GNU Library General Public
+ * 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
- * Library General Public License for more details.
+ * Lesser General Public License for more details.
*
- * You should have received a copy of the GNU Library General Public
+ * 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.
#include <config.h>
#include <stdio.h>
+#include <stdlib.h>
#include <png.h>
-#include "gdk-pixbuf.h"
+#include "gdk-pixbuf-private.h"
+#include "gdk-pixbuf-io.h"
\f
-/* Destroy notification function for the libart pixbuf */
+static gboolean
+setup_png_transformations(png_structp png_read_ptr, png_infop png_info_ptr,
+ GError **error,
+ png_uint_32* width_p, png_uint_32* height_p,
+ int* color_type_p)
+{
+ png_uint_32 width, height;
+ int bit_depth, color_type, interlace_type, compression_type, filter_type;
+ int channels;
+
+ /* Get the image info */
+
+ /* Must check bit depth, since png_get_IHDR generates an
+ FPE on bit_depth 0.
+ */
+ bit_depth = png_get_bit_depth (png_read_ptr, png_info_ptr);
+ if (bit_depth < 1 || bit_depth > 16) {
+ g_set_error (error,
+ GDK_PIXBUF_ERROR,
+ GDK_PIXBUF_ERROR_CORRUPT_IMAGE,
+ _("Bits per channel of PNG image is invalid."));
+ return FALSE;
+ }
+ png_get_IHDR (png_read_ptr, png_info_ptr,
+ &width, &height,
+ &bit_depth,
+ &color_type,
+ &interlace_type,
+ &compression_type,
+ &filter_type);
+
+ /* set_expand() basically needs to be called unless
+ we are already in RGB/RGBA mode
+ */
+ if (color_type == PNG_COLOR_TYPE_PALETTE &&
+ bit_depth <= 8) {
+
+ /* Convert indexed images to RGB */
+ png_set_expand (png_read_ptr);
+
+ } else if (color_type == PNG_COLOR_TYPE_GRAY &&
+ bit_depth < 8) {
+
+ /* Convert grayscale to RGB */
+ png_set_expand (png_read_ptr);
+
+ } else if (png_get_valid (png_read_ptr,
+ png_info_ptr, PNG_INFO_tRNS)) {
+
+ /* If we have transparency header, convert it to alpha
+ channel */
+ png_set_expand(png_read_ptr);
+
+ } else if (bit_depth < 8) {
+
+ /* If we have < 8 scale it up to 8 */
+ png_set_expand(png_read_ptr);
+
+
+ /* Conceivably, png_set_packing() is a better idea;
+ * God only knows how libpng works
+ */
+ }
+
+ /* If we are 16-bit, convert to 8-bit */
+ if (bit_depth == 16) {
+ png_set_strip_16(png_read_ptr);
+ }
+
+ /* If gray scale, convert to RGB */
+ if (color_type == PNG_COLOR_TYPE_GRAY ||
+ color_type == PNG_COLOR_TYPE_GRAY_ALPHA) {
+ png_set_gray_to_rgb(png_read_ptr);
+ }
+
+ /* If interlaced, handle that */
+ if (interlace_type != PNG_INTERLACE_NONE) {
+ png_set_interlace_handling(png_read_ptr);
+ }
+
+ /* Update the info the reflect our transformations */
+ png_read_update_info(png_read_ptr, png_info_ptr);
+
+ png_get_IHDR (png_read_ptr, png_info_ptr,
+ &width, &height,
+ &bit_depth,
+ &color_type,
+ &interlace_type,
+ &compression_type,
+ &filter_type);
+
+ *width_p = width;
+ *height_p = height;
+ *color_type_p = color_type;
+
+ /* Check that the new info is what we want */
+
+ if (width == 0 || height == 0) {
+ g_set_error (error,
+ GDK_PIXBUF_ERROR,
+ GDK_PIXBUF_ERROR_CORRUPT_IMAGE,
+ _("Transformed PNG has zero width or height."));
+ return FALSE;
+ }
+
+ if (bit_depth != 8) {
+ g_set_error (error,
+ GDK_PIXBUF_ERROR,
+ GDK_PIXBUF_ERROR_CORRUPT_IMAGE,
+ _("Bits per channel of transformed PNG is not 8."));
+ return FALSE;
+ }
+
+ if ( ! (color_type == PNG_COLOR_TYPE_RGB ||
+ color_type == PNG_COLOR_TYPE_RGB_ALPHA) ) {
+ g_set_error (error,
+ GDK_PIXBUF_ERROR,
+ GDK_PIXBUF_ERROR_CORRUPT_IMAGE,
+ _("Transformed PNG not RGB or RGBA."));
+ return FALSE;
+ }
+
+ channels = png_get_channels(png_read_ptr, png_info_ptr);
+ if ( ! (channels == 3 || channels == 4) ) {
+ g_set_error (error,
+ GDK_PIXBUF_ERROR,
+ GDK_PIXBUF_ERROR_CORRUPT_IMAGE,
+ _("Transformed PNG has unsupported number of channels, must be 3 or 4."));
+ return FALSE;
+ }
+ return TRUE;
+}
+
+static void
+png_simple_error_callback(png_structp png_save_ptr,
+ png_const_charp error_msg)
+{
+ GError **error;
+
+ error = png_get_error_ptr(png_save_ptr);
+
+ /* I don't trust libpng to call the error callback only once,
+ * so check for already-set error
+ */
+ if (error && *error == NULL) {
+ g_set_error (error,
+ GDK_PIXBUF_ERROR,
+ GDK_PIXBUF_ERROR_FAILED,
+ _("Fatal error in PNG image file: %s"),
+ error_msg);
+ }
+
+ longjmp (png_save_ptr->jmpbuf, 1);
+}
+
+static void
+png_simple_warning_callback(png_structp png_save_ptr,
+ png_const_charp warning_msg)
+{
+ /* Don't print anything; we should not be dumping junk to
+ * stderr, since that may be bad for some apps. If it's
+ * important enough to display, we need to add a GError
+ * **warning return location wherever we have an error return
+ * location.
+ */
+}
+
+static gboolean
+png_text_to_pixbuf_option (png_text text_ptr,
+ gchar **key,
+ gchar **value)
+{
+ if (text_ptr.text_length > 0) {
+ *value = g_convert (text_ptr.text, -1,
+ "UTF-8", "ISO-8859-1",
+ NULL, NULL, NULL);
+ }
+ else {
+ *value = g_strdup (text_ptr.text);
+ }
+ if (*value) {
+ *key = g_strconcat ("tEXt::", text_ptr.key, NULL);
+ return TRUE;
+ } else {
+ g_warning ("Couldn't convert text chunk value to UTF-8.");
+ *key = NULL;
+ return FALSE;
+ }
+}
+
+static png_voidp
+png_malloc_callback (png_structp o, png_size_t size)
+{
+ return g_try_malloc (size);
+}
+
static void
-free_buffer (gpointer user_data, gpointer data)
+png_free_callback (png_structp o, png_voidp x)
{
- free (data);
+ g_free (x);
}
/* Shared library entry point */
-GdkPixbuf *
-image_load (FILE *f)
+static GdkPixbuf *
+gdk_pixbuf__png_image_load (FILE *f, GError **error)
{
+ GdkPixbuf * volatile pixbuf = NULL;
png_structp png_ptr;
- png_infop info_ptr, end_info;
- gint i, depth, ctype, inttype, passes, bpp;
+ png_infop info_ptr;
+ png_textp text_ptr;
+ gint i, ctype;
png_uint_32 w, h;
- png_bytepp rows;
- guchar *pixels;
+ png_bytepp volatile rows = NULL;
+ gint num_texts;
+ gchar *key;
+ gchar *value;
- png_ptr = png_create_read_struct (PNG_LIBPNG_VER_STRING, NULL, NULL, NULL);
+#ifdef PNG_USER_MEM_SUPPORTED
+ png_ptr = png_create_read_struct_2 (PNG_LIBPNG_VER_STRING,
+ error,
+ png_simple_error_callback,
+ png_simple_warning_callback,
+ NULL,
+ png_malloc_callback,
+ png_free_callback);
+#else
+ png_ptr = png_create_read_struct (PNG_LIBPNG_VER_STRING,
+ error,
+ png_simple_error_callback,
+ png_simple_warning_callback);
+#endif
if (!png_ptr)
return NULL;
return NULL;
}
- end_info = png_create_info_struct (png_ptr);
- if (!end_info) {
+ if (setjmp (png_ptr->jmpbuf)) {
+ if (rows)
+ g_free (rows);
+
+ if (pixbuf)
+ g_object_unref (pixbuf);
+
png_destroy_read_struct (&png_ptr, &info_ptr, NULL);
return NULL;
}
- if (setjmp (png_ptr->jmpbuf)) {
- png_destroy_read_struct (&png_ptr, &info_ptr, &end_info);
+ png_init_io (png_ptr, f);
+ png_read_info (png_ptr, info_ptr);
+
+ if (!setup_png_transformations(png_ptr, info_ptr, error, &w, &h, &ctype)) {
+ png_destroy_read_struct (&png_ptr, &info_ptr, NULL);
+ return NULL;
+ }
+
+ pixbuf = gdk_pixbuf_new (GDK_COLORSPACE_RGB, ctype & PNG_COLOR_MASK_ALPHA, 8, w, h);
+
+ if (!pixbuf) {
+ if (error && *error == NULL) {
+ g_set_error (error,
+ GDK_PIXBUF_ERROR,
+ GDK_PIXBUF_ERROR_INSUFFICIENT_MEMORY,
+ _("Insufficient memory to load PNG file"));
+ }
+
+
+ png_destroy_read_struct (&png_ptr, &info_ptr, NULL);
return NULL;
}
- png_init_io (png_ptr, f);
- png_read_info (png_ptr, info_ptr);
- png_get_IHDR (png_ptr, info_ptr, &w, &h, &depth, &ctype, &inttype, NULL, NULL);
-
- /* Ok, we want to work with 24 bit images.
- * However, PNG can vary depth per channel.
- * So, we use the png_set_expand function to expand
- * everything into a format libart expects.
- * We also use png_set_strip_16 to reduce down to 8 bit/chan.
- */
- if (ctype == PNG_COLOR_TYPE_PALETTE && depth <= 8)
- png_set_expand (png_ptr);
-
- if (ctype == PNG_COLOR_TYPE_GRAY && depth < 8)
- png_set_expand (png_ptr);
-
- if (png_get_valid (png_ptr, info_ptr, PNG_INFO_tRNS)) {
- png_set_expand (png_ptr);
- g_warning ("FIXME: We are going to crash");
+ rows = g_new (png_bytep, h);
+
+ for (i = 0; i < h; i++)
+ rows[i] = pixbuf->pixels + i * pixbuf->rowstride;
+
+ png_read_image (png_ptr, rows);
+ png_read_end (png_ptr, info_ptr);
+
+ if (png_get_text (png_ptr, info_ptr, &text_ptr, &num_texts)) {
+ for (i = 0; i < num_texts; i++) {
+ png_text_to_pixbuf_option (text_ptr[i], &key, &value);
+ gdk_pixbuf_set_option (pixbuf, key, value);
+ g_free (key);
+ g_free (value);
+ }
+ }
+
+ g_free (rows);
+ png_destroy_read_struct (&png_ptr, &info_ptr, NULL);
+
+ return pixbuf;
+}
+
+/* I wish these avoided the setjmp()/longjmp() crap in libpng instead
+ just allow you to change the error reporting. */
+static void png_error_callback (png_structp png_read_ptr,
+ png_const_charp error_msg);
+
+static void png_warning_callback(png_structp png_read_ptr,
+ png_const_charp warning_msg);
+
+/* Called at the start of the progressive load */
+static void png_info_callback (png_structp png_read_ptr,
+ png_infop png_info_ptr);
+
+/* Called for each row; note that you will get duplicate row numbers
+ for interlaced PNGs */
+static void png_row_callback (png_structp png_read_ptr,
+ png_bytep new_row,
+ png_uint_32 row_num,
+ int pass_num);
+
+/* Called after reading the entire image */
+static void png_end_callback (png_structp png_read_ptr,
+ png_infop png_info_ptr);
+
+typedef struct _LoadContext LoadContext;
+
+struct _LoadContext {
+ png_structp png_read_ptr;
+ png_infop png_info_ptr;
+
+ GdkPixbufModuleSizeFunc size_func;
+ GdkPixbufModulePreparedFunc prepare_func;
+ GdkPixbufModuleUpdatedFunc update_func;
+ gpointer notify_user_data;
+
+ GdkPixbuf* pixbuf;
+
+ /* row number of first row seen, or -1 if none yet seen */
+
+ gint first_row_seen_in_chunk;
+
+ /* pass number for the first row seen */
+
+ gint first_pass_seen_in_chunk;
+
+ /* row number of last row seen */
+ gint last_row_seen_in_chunk;
+
+ gint last_pass_seen_in_chunk;
+
+ /* highest row number seen */
+ gint max_row_seen_in_chunk;
+
+ guint fatal_error_occurred : 1;
+
+ GError **error;
+};
+
+static gpointer
+gdk_pixbuf__png_image_begin_load (GdkPixbufModuleSizeFunc size_func,
+ GdkPixbufModulePreparedFunc prepare_func,
+ GdkPixbufModuleUpdatedFunc update_func,
+ gpointer user_data,
+ GError **error)
+{
+ LoadContext* lc;
+
+ lc = g_new0(LoadContext, 1);
+
+ lc->fatal_error_occurred = FALSE;
+
+ lc->size_func = size_func;
+ lc->prepare_func = prepare_func;
+ lc->update_func = update_func;
+ lc->notify_user_data = user_data;
+
+ lc->first_row_seen_in_chunk = -1;
+ lc->last_row_seen_in_chunk = -1;
+ lc->first_pass_seen_in_chunk = -1;
+ lc->last_pass_seen_in_chunk = -1;
+ lc->max_row_seen_in_chunk = -1;
+ lc->error = error;
+
+ /* Create the main PNG context struct */
+
+#ifdef PNG_USER_MEM_SUPPORTED
+ lc->png_read_ptr = png_create_read_struct_2 (PNG_LIBPNG_VER_STRING,
+ lc, /* error/warning callback data */
+ png_error_callback,
+ png_warning_callback,
+ NULL,
+ png_malloc_callback,
+ png_free_callback);
+#else
+ lc->png_read_ptr = png_create_read_struct(PNG_LIBPNG_VER_STRING,
+ lc, /* error/warning callback data */
+ png_error_callback,
+ png_warning_callback);
+#endif
+ if (lc->png_read_ptr == NULL) {
+ g_free(lc);
+ /* error callback should have set the error */
+ return NULL;
+ }
+
+ if (setjmp (lc->png_read_ptr->jmpbuf)) {
+ if (lc->png_info_ptr)
+ png_destroy_read_struct(&lc->png_read_ptr, NULL, NULL);
+ g_free(lc);
+ /* error callback should have set the error */
+ return NULL;
}
- if (depth == 16)
- png_set_strip_16 (png_ptr);
+ /* Create the auxiliary context struct */
+
+ lc->png_info_ptr = png_create_info_struct(lc->png_read_ptr);
+
+ if (lc->png_info_ptr == NULL) {
+ png_destroy_read_struct(&lc->png_read_ptr, NULL, NULL);
+ g_free(lc);
+ /* error callback should have set the error */
+ return NULL;
+ }
- /* We also have png "packing" bits into bytes if < 8 */
- if (depth < 8)
- png_set_packing (png_ptr);
+ png_set_progressive_read_fn(lc->png_read_ptr,
+ lc, /* callback data */
+ png_info_callback,
+ png_row_callback,
+ png_end_callback);
+
- /* Lastly, if the PNG is greyscale, convert to RGB */
- if (ctype == PNG_COLOR_TYPE_GRAY || ctype == PNG_COLOR_TYPE_GRAY_ALPHA)
- png_set_gray_to_rgb (png_ptr);
+ /* We don't want to keep modifying error after returning here,
+ * it may no longer be valid.
+ */
+ lc->error = NULL;
+
+ return lc;
+}
- /* ...and if we're interlaced... */
- passes = png_set_interlace_handling (png_ptr);
+static gboolean
+gdk_pixbuf__png_image_stop_load (gpointer context, GError **error)
+{
+ LoadContext* lc = context;
- png_read_update_info (png_ptr, info_ptr);
+ g_return_val_if_fail(lc != NULL, TRUE);
- if (ctype & PNG_COLOR_MASK_ALPHA)
- bpp = 4;
- else
- bpp = 3;
+ /* FIXME this thing needs to report errors if
+ * we have unused image data
+ */
+
+ if (lc->pixbuf)
+ g_object_unref (lc->pixbuf);
+
+ png_destroy_read_struct(&lc->png_read_ptr, &lc->png_info_ptr, NULL);
+ g_free(lc);
- pixels = malloc (w * h * bpp);
- if (!pixels) {
- png_destroy_read_struct (&png_ptr, &info_ptr, &end_info);
- return NULL;
+ return TRUE;
+}
+
+static gboolean
+gdk_pixbuf__png_image_load_increment(gpointer context,
+ const guchar *buf, guint size,
+ GError **error)
+{
+ LoadContext* lc = context;
+
+ g_return_val_if_fail(lc != NULL, FALSE);
+
+ /* reset */
+ lc->first_row_seen_in_chunk = -1;
+ lc->last_row_seen_in_chunk = -1;
+ lc->first_pass_seen_in_chunk = -1;
+ lc->last_pass_seen_in_chunk = -1;
+ lc->max_row_seen_in_chunk = -1;
+ lc->error = error;
+
+ /* Invokes our callbacks as needed */
+ if (setjmp (lc->png_read_ptr->jmpbuf)) {
+ lc->error = NULL;
+ return FALSE;
+ } else {
+ png_process_data(lc->png_read_ptr, lc->png_info_ptr,
+ (guchar*) buf, size);
}
- rows = g_new (png_bytep, h);
+ if (lc->fatal_error_occurred) {
+ lc->error = NULL;
+ return FALSE;
+ } else {
+ if (lc->first_row_seen_in_chunk >= 0) {
+ /* We saw at least one row */
+ gint pass_diff = lc->last_pass_seen_in_chunk - lc->first_pass_seen_in_chunk;
+
+ g_assert(pass_diff >= 0);
+
+ if (pass_diff == 0) {
+ /* start and end row were in the same pass */
+ (lc->update_func)(lc->pixbuf, 0,
+ lc->first_row_seen_in_chunk,
+ lc->pixbuf->width,
+ (lc->last_row_seen_in_chunk -
+ lc->first_row_seen_in_chunk) + 1,
+ lc->notify_user_data);
+ } else if (pass_diff == 1) {
+ /* We have from the first row seen to
+ the end of the image (max row
+ seen), then from the top of the
+ image to the last row seen */
+ /* first row to end */
+ (lc->update_func)(lc->pixbuf, 0,
+ lc->first_row_seen_in_chunk,
+ lc->pixbuf->width,
+ (lc->max_row_seen_in_chunk -
+ lc->first_row_seen_in_chunk) + 1,
+ lc->notify_user_data);
+ /* top to last row */
+ (lc->update_func)(lc->pixbuf,
+ 0, 0,
+ lc->pixbuf->width,
+ lc->last_row_seen_in_chunk + 1,
+ lc->notify_user_data);
+ } else {
+ /* We made at least one entire pass, so update the
+ whole image */
+ (lc->update_func)(lc->pixbuf,
+ 0, 0,
+ lc->pixbuf->width,
+ lc->max_row_seen_in_chunk + 1,
+ lc->notify_user_data);
+ }
+ }
- for (i = 0; i < h; i++)
- rows[i] = pixels + i * w * bpp;
+ lc->error = NULL;
+
+ return TRUE;
+ }
+}
- png_read_image (png_ptr, rows);
- png_destroy_read_struct (&png_ptr, &info_ptr, &end_info);
- g_free (rows);
+/* Called at the start of the progressive load, once we have image info */
+static void
+png_info_callback (png_structp png_read_ptr,
+ png_infop png_info_ptr)
+{
+ LoadContext* lc;
+ png_uint_32 width, height;
+ png_textp png_text_ptr;
+ int i, num_texts;
+ int color_type;
+ gboolean have_alpha = FALSE;
+
+ lc = png_get_progressive_ptr(png_read_ptr);
+
+ if (lc->fatal_error_occurred)
+ return;
+
+ if (!setup_png_transformations(lc->png_read_ptr,
+ lc->png_info_ptr,
+ lc->error,
+ &width, &height, &color_type)) {
+ lc->fatal_error_occurred = TRUE;
+ return;
+ }
+
+ /* If we have alpha, set a flag */
+ if (color_type & PNG_COLOR_MASK_ALPHA)
+ have_alpha = TRUE;
+
+ if (lc->size_func) {
+ gint w = width;
+ gint h = height;
+ (* lc->size_func) (&w, &h, lc->notify_user_data);
+
+ if (w == 0 || h == 0) {
+ lc->fatal_error_occurred = TRUE;
+ return;
+ }
+ }
+
+ lc->pixbuf = gdk_pixbuf_new (GDK_COLORSPACE_RGB, have_alpha, 8, width, height);
+
+ if (lc->pixbuf == NULL) {
+ /* Failed to allocate memory */
+ lc->fatal_error_occurred = TRUE;
+ if (lc->error && *lc->error == NULL) {
+ g_set_error (lc->error,
+ GDK_PIXBUF_ERROR,
+ GDK_PIXBUF_ERROR_INSUFFICIENT_MEMORY,
+ _("Insufficient memory to store a %ld by %ld image; try exiting some applications to reduce memory usage"),
+ width, height);
+ }
+ return;
+ }
+
+ /* Extract text chunks and attach them as pixbuf options */
+
+ if (png_get_text (png_read_ptr, png_info_ptr, &png_text_ptr, &num_texts)) {
+ for (i = 0; i < num_texts; i++) {
+ gchar *key, *value;
+
+ if (png_text_to_pixbuf_option (png_text_ptr[i],
+ &key, &value)) {
+ gdk_pixbuf_set_option (lc->pixbuf, key, value);
+ g_free (key);
+ g_free (value);
+ }
+ }
+ }
+
+ /* Notify the client that we are ready to go */
+
+ if (lc->prepare_func)
+ (* lc->prepare_func) (lc->pixbuf, NULL, lc->notify_user_data);
+
+ return;
+}
+
+/* Called for each row; note that you will get duplicate row numbers
+ for interlaced PNGs */
+static void
+png_row_callback (png_structp png_read_ptr,
+ png_bytep new_row,
+ png_uint_32 row_num,
+ int pass_num)
+{
+ LoadContext* lc;
+ guchar* old_row = NULL;
+
+ lc = png_get_progressive_ptr(png_read_ptr);
+
+ if (lc->fatal_error_occurred)
+ return;
+
+ if (row_num < 0 || row_num >= lc->pixbuf->height) {
+ lc->fatal_error_occurred = TRUE;
+ if (lc->error && *lc->error == NULL) {
+ g_set_error (lc->error,
+ GDK_PIXBUF_ERROR,
+ GDK_PIXBUF_ERROR_CORRUPT_IMAGE,
+ _("Fatal error reading PNG image file"));
+ }
+ return;
+ }
+
+ if (lc->first_row_seen_in_chunk < 0) {
+ lc->first_row_seen_in_chunk = row_num;
+ lc->first_pass_seen_in_chunk = pass_num;
+ }
+
+ lc->max_row_seen_in_chunk = MAX(lc->max_row_seen_in_chunk, ((gint)row_num));
+ lc->last_row_seen_in_chunk = row_num;
+ lc->last_pass_seen_in_chunk = pass_num;
+
+ old_row = lc->pixbuf->pixels + (row_num * lc->pixbuf->rowstride);
+
+ png_progressive_combine_row(lc->png_read_ptr, old_row, new_row);
+}
+
+/* Called after reading the entire image */
+static void
+png_end_callback (png_structp png_read_ptr,
+ png_infop png_info_ptr)
+{
+ LoadContext* lc;
+
+ lc = png_get_progressive_ptr(png_read_ptr);
+
+ if (lc->fatal_error_occurred)
+ return;
+}
+
+static void
+png_error_callback(png_structp png_read_ptr,
+ png_const_charp error_msg)
+{
+ LoadContext* lc;
+
+ lc = png_get_error_ptr(png_read_ptr);
+
+ lc->fatal_error_occurred = TRUE;
+
+ /* I don't trust libpng to call the error callback only once,
+ * so check for already-set error
+ */
+ if (lc->error && *lc->error == NULL) {
+ g_set_error (lc->error,
+ GDK_PIXBUF_ERROR,
+ GDK_PIXBUF_ERROR_CORRUPT_IMAGE,
+ _("Fatal error reading PNG image file: %s"),
+ error_msg);
+ }
+
+ longjmp (png_read_ptr->jmpbuf, 1);
+}
+
+static void
+png_warning_callback(png_structp png_read_ptr,
+ png_const_charp warning_msg)
+{
+ LoadContext* lc;
+
+ lc = png_get_error_ptr(png_read_ptr);
+
+ /* Don't print anything; we should not be dumping junk to
+ * stderr, since that may be bad for some apps. If it's
+ * important enough to display, we need to add a GError
+ * **warning return location wherever we have an error return
+ * location.
+ */
+}
+
+
+/* Save */
+
+typedef struct {
+ GdkPixbufSaveFunc save_func;
+ gpointer user_data;
+ GError **error;
+} SaveToFunctionIoPtr;
+
+static void
+png_save_to_callback_write_func (png_structp png_ptr,
+ png_bytep data,
+ png_size_t length)
+{
+ SaveToFunctionIoPtr *ioptr = png_get_io_ptr (png_ptr);
+
+ if (!ioptr->save_func (data, length, ioptr->error, ioptr->user_data)) {
+ /* If save_func has already set an error, which it
+ should have done, this won't overwrite it. */
+ png_error (png_ptr, "write function failed");
+ }
+}
+
+static void
+png_save_to_callback_flush_func (png_structp png_ptr)
+{
+ ;
+}
+
+static gboolean real_save_png (GdkPixbuf *pixbuf,
+ gchar **keys,
+ gchar **values,
+ GError **error,
+ gboolean to_callback,
+ FILE *f,
+ GdkPixbufSaveFunc save_func,
+ gpointer user_data)
+{
+ png_structp png_ptr;
+ png_infop info_ptr;
+ png_textp text_ptr = NULL;
+ guchar *ptr;
+ guchar *pixels;
+ int y;
+ int i;
+ png_bytep row_ptr;
+ png_color_8 sig_bit;
+ int w, h, rowstride;
+ int has_alpha;
+ int bpc;
+ int num_keys;
+ gboolean success = TRUE;
+ SaveToFunctionIoPtr to_callback_ioptr;
+
+ num_keys = 0;
+
+ if (keys && *keys) {
+ gchar **kiter;
+ gchar *key;
+ int len;
+
+ for (kiter = keys; *kiter; kiter++) {
+ if (strncmp (*kiter, "tEXt::", 6) != 0) {
+ g_warning ("Bad option name '%s' passed to PNG saver", *kiter);
+ return FALSE;
+ }
+ key = *kiter + 6;
+ len = strlen (key);
+ if (len <= 1 || len > 79) {
+ g_set_error (error,
+ GDK_PIXBUF_ERROR,
+ GDK_PIXBUF_ERROR_BAD_OPTION,
+ _("Keys for PNG text chunks must have at least 1 and at most 79 characters."));
+ return FALSE;
+ }
+ for (i = 0; i < len; i++) {
+ if ((guchar) key[i] > 127) {
+ g_set_error (error,
+ GDK_PIXBUF_ERROR,
+ GDK_PIXBUF_ERROR_BAD_OPTION,
+ _("Keys for PNG text chunks must be ASCII characters."));
+ return FALSE;
+ }
+ }
+ num_keys++;
+ }
+ }
+
+ if (num_keys > 0) {
+ text_ptr = g_new0 (png_text, num_keys);
+ for (i = 0; i < num_keys; i++) {
+ text_ptr[i].compression = PNG_TEXT_COMPRESSION_NONE;
+ text_ptr[i].key = keys[i] + 6;
+ text_ptr[i].text = g_convert (values[i], -1,
+ "ISO-8859-1", "UTF-8",
+ NULL, &text_ptr[i].text_length,
+ NULL);
+
+#ifdef PNG_iTXt_SUPPORTED
+ if (!text_ptr[i].text) {
+ text_ptr[i].compression = PNG_ITXT_COMPRESSION_NONE;
+ text_ptr[i].text = g_strdup (values[i]);
+ text_ptr[i].text_length = 0;
+ text_ptr[i].itxt_length = strlen (text_ptr[i].text);
+ text_ptr[i].lang = NULL;
+ text_ptr[i].lang_key = NULL;
+ }
+#endif
+
+ if (!text_ptr[i].text) {
+ g_set_error (error,
+ GDK_PIXBUF_ERROR,
+ GDK_PIXBUF_ERROR_BAD_OPTION,
+ _("Value for PNG text chunk %s can not be converted to ISO-8859-1 encoding."), keys[i] + 6);
+ num_keys = i;
+ for (i = 0; i < num_keys; i++)
+ g_free (text_ptr[i].text);
+ g_free (text_ptr);
+ return FALSE;
+ }
+ }
+ }
+
+ bpc = gdk_pixbuf_get_bits_per_sample (pixbuf);
+ w = gdk_pixbuf_get_width (pixbuf);
+ h = gdk_pixbuf_get_height (pixbuf);
+ rowstride = gdk_pixbuf_get_rowstride (pixbuf);
+ has_alpha = gdk_pixbuf_get_has_alpha (pixbuf);
+ pixels = gdk_pixbuf_get_pixels (pixbuf);
+
+ png_ptr = png_create_write_struct (PNG_LIBPNG_VER_STRING,
+ error,
+ png_simple_error_callback,
+ png_simple_warning_callback);
+
+ g_return_val_if_fail (png_ptr != NULL, FALSE);
+
+ info_ptr = png_create_info_struct (png_ptr);
+ if (info_ptr == NULL) {
+ success = FALSE;
+ goto cleanup;
+ }
+ if (setjmp (png_ptr->jmpbuf)) {
+ success = FALSE;
+ goto cleanup;
+ }
+
+ if (num_keys > 0) {
+ png_set_text (png_ptr, info_ptr, text_ptr, num_keys);
+ }
+
+ if (to_callback) {
+ to_callback_ioptr.save_func = save_func;
+ to_callback_ioptr.user_data = user_data;
+ to_callback_ioptr.error = error;
+ png_set_write_fn (png_ptr, &to_callback_ioptr,
+ png_save_to_callback_write_func,
+ png_save_to_callback_flush_func);
+ } else {
+ png_init_io (png_ptr, f);
+ }
+
+ if (has_alpha) {
+ png_set_IHDR (png_ptr, info_ptr, w, h, bpc,
+ PNG_COLOR_TYPE_RGB_ALPHA, PNG_INTERLACE_NONE,
+ PNG_COMPRESSION_TYPE_BASE, PNG_FILTER_TYPE_BASE);
+ } else {
+ png_set_IHDR (png_ptr, info_ptr, w, h, bpc,
+ PNG_COLOR_TYPE_RGB, PNG_INTERLACE_NONE,
+ PNG_COMPRESSION_TYPE_BASE, PNG_FILTER_TYPE_BASE);
+ }
+ sig_bit.red = bpc;
+ sig_bit.green = bpc;
+ sig_bit.blue = bpc;
+ sig_bit.alpha = bpc;
+ png_set_sBIT (png_ptr, info_ptr, &sig_bit);
+ png_write_info (png_ptr, info_ptr);
+ png_set_shift (png_ptr, &sig_bit);
+ png_set_packing (png_ptr);
+
+ ptr = pixels;
+ for (y = 0; y < h; y++) {
+ row_ptr = (png_bytep)ptr;
+ png_write_rows (png_ptr, &row_ptr, 1);
+ ptr += rowstride;
+ }
+
+ png_write_end (png_ptr, info_ptr);
+
+cleanup:
+ png_destroy_write_struct (&png_ptr, &info_ptr);
+
+ if (num_keys > 0) {
+ for (i = 0; i < num_keys; i++)
+ g_free (text_ptr[i].text);
+ g_free (text_ptr);
+ }
+
+ return success;
+}
+
+static gboolean
+gdk_pixbuf__png_image_save (FILE *f,
+ GdkPixbuf *pixbuf,
+ gchar **keys,
+ gchar **values,
+ GError **error)
+{
+ return real_save_png (pixbuf, keys, values, error,
+ FALSE, f, NULL, NULL);
+}
+
+static gboolean
+gdk_pixbuf__png_image_save_to_callback (GdkPixbufSaveFunc save_func,
+ gpointer user_data,
+ GdkPixbuf *pixbuf,
+ gchar **keys,
+ gchar **values,
+ GError **error)
+{
+ return real_save_png (pixbuf, keys, values, error,
+ TRUE, NULL, save_func, user_data);
+}
+
+void
+MODULE_ENTRY (png, fill_vtable) (GdkPixbufModule *module)
+{
+ module->load = gdk_pixbuf__png_image_load;
+ module->begin_load = gdk_pixbuf__png_image_begin_load;
+ module->stop_load = gdk_pixbuf__png_image_stop_load;
+ module->load_increment = gdk_pixbuf__png_image_load_increment;
+ module->save = gdk_pixbuf__png_image_save;
+ module->save_to_callback = gdk_pixbuf__png_image_save_to_callback;
+}
+
+void
+MODULE_ENTRY (png, fill_info) (GdkPixbufFormat *info)
+{
+ static GdkPixbufModulePattern signature[] = {
+ { "\x89PNG\r\n\x1a\x0a", NULL, 100 },
+ { NULL, NULL, 0 }
+ };
+ static gchar * mime_types[] = {
+ "image/png",
+ NULL
+ };
+ static gchar * extensions[] = {
+ "png",
+ NULL
+ };
- if (ctype & PNG_COLOR_MASK_ALPHA)
- return gdk_pixbuf_new_from_data (pixels, ART_PIX_RGB, TRUE,
- w, h, w * 4,
- free_buffer, NULL);
- else
- return gdk_pixbuf_new_from_data (pixels, ART_PIX_RGB, FALSE,
- w, h, w * 3,
- free_buffer, NULL);
+ info->name = "png";
+ info->signature = signature;
+ info->description = N_("The PNG image format");
+ info->mime_types = mime_types;
+ info->extensions = extensions;
+ info->flags = GDK_PIXBUF_FORMAT_WRITABLE;
}