[gtk+] Add color management support to gdk_pixbuf_save
- From: Richard Hughes <rhughes src gnome org>
- To: svn-commits-list gnome org
- Cc:
- Subject: [gtk+] Add color management support to gdk_pixbuf_save
- Date: Fri, 18 Dec 2009 15:18:20 +0000 (UTC)
commit ba651d4022ed4dceb6ad7394adcb0ff6c8006581
Author: Richard Hughes <richard hughsie com>
Date: Fri Dec 18 15:17:13 2009 +0000
Add color management support to gdk_pixbuf_save
This patch adds an icc-profile option to a GdkPixbuf which can
be used to read or write an embedded ICC profile.
Add PNG support for now, but other image formats are awaiting
review.
demos/Makefile.am | 4 ++
demos/testpixbuf-color.c | 116 ++++++++++++++++++++++++++++++++++++++++++++
gdk-pixbuf/gdk-pixbuf-io.c | 15 ++++++
gdk-pixbuf/io-png.c | 93 ++++++++++++++++++++++++++++++-----
4 files changed, 215 insertions(+), 13 deletions(-)
---
diff --git a/demos/Makefile.am b/demos/Makefile.am
index c8c9bbb..81e07f4 100644
--- a/demos/Makefile.am
+++ b/demos/Makefile.am
@@ -24,6 +24,7 @@ LDADDS = \
noinst_PROGRAMS = \
testpixbuf-drawable \
testanimation \
+ testpixbuf-color \
testpixbuf-save \
testpixbuf-scale \
pixbuf-demo
@@ -52,6 +53,7 @@ test-inline-pixbufs.h: $(pixbuf_csource_deps) apple-red.png gnome-foot.png
testpixbuf_DEPENDENCIES = $(DEPS)
testpixbuf_drawable_DEPENDENCIES = $(DEPS)
testpixbuf_save_DEPENDENCIES = $(DEPS)
+testpixbuf_color_DEPENDENCIES = $(DEPS)
testpixbuf_scale_DEPENDENCIES = $(DEPS)
testanimation_DEPENDENCIES = $(DEPS)
pixbuf_demo_DEPENDENCIES = $(DEPS)
@@ -59,6 +61,7 @@ pixbuf_demo_DEPENDENCIES = $(DEPS)
testpixbuf_LDADD = $(LDADDS)
testpixbuf_drawable_LDADD = $(LDADDS)
testpixbuf_save_LDADD = $(LDADDS)
+testpixbuf_color_LDADD = $(LDADDS)
testpixbuf_scale_LDADD = $(LDADDS)
testanimation_LDADD = $(LDADDS)
pixbuf_demo_LDADD = $(LDADDS)
@@ -66,6 +69,7 @@ pixbuf_demo_LDADD = $(LDADDS)
testpixbuf_SOURCES = testpixbuf.c pixbuf-init.c
testpixbuf_drawable_SOURCES = testpixbuf-drawable.c pixbuf-init.c
testpixbuf_save_SOURCES = testpixbuf-save.c
+testpixbuf_color_SOURCES = testpixbuf-color.c
testpixbuf_scale_SOURCES = testpixbuf-scale.c pixbuf-init.c
testanimation_SOURCES = testanimation.c pixbuf-init.c
pixbuf_demo_SOURCES = pixbuf-demo.c pixbuf-init.c
diff --git a/demos/testpixbuf-color.c b/demos/testpixbuf-color.c
new file mode 100644
index 0000000..b87d850
--- /dev/null
+++ b/demos/testpixbuf-color.c
@@ -0,0 +1,116 @@
+/* -*- Mode: C; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 8 -*- */
+
+#include "config.h"
+#include <stdio.h>
+#include <string.h>
+
+#include <gtk/gtk.h>
+
+#define ICC_PROFILE "/usr/share/color/icc/bluish.icc"
+#define ICC_PROFILE_SIZE 3966
+
+static gboolean
+save_image_png (const gchar *filename, GdkPixbuf *pixbuf, GError **error)
+{
+ gchar *contents = NULL;
+ gchar *contents_encode = NULL;
+ gsize length;
+ gboolean ret;
+ gint len;
+
+ /* get icc file */
+ ret = g_file_get_contents (ICC_PROFILE, &contents, &length, error);
+ if (!ret)
+ goto out;
+ contents_encode = g_base64_encode ((const guchar *) contents, length);
+ ret = gdk_pixbuf_save (pixbuf, filename, "png", error,
+ "tEXt::Software", "Hello my name is dave",
+ "icc-profile", contents_encode,
+ NULL);
+ len = strlen (contents_encode);
+ g_debug ("ICC profile was %i bytes", len);
+out:
+ g_free (contents);
+ g_free (contents_encode);
+ return ret;
+}
+
+static gboolean
+save_image_verify (const gchar *filename, GError **error)
+{
+ gboolean ret = FALSE;
+ GdkPixbuf *pixbuf = NULL;
+ const gchar *option;
+ gchar *icc_profile = NULL;
+ gsize len = 0;
+
+ /* load */
+ pixbuf = gdk_pixbuf_new_from_file (filename, error);
+ if (pixbuf == NULL)
+ goto out;
+
+ /* check values */
+ option = gdk_pixbuf_get_option (pixbuf, "icc-profile");
+ if (option == NULL) {
+ *error = g_error_new (1, 0, "no profile set");
+ goto out;
+ }
+
+ /* decode base64 */
+ icc_profile = (gchar *) g_base64_decode (option, &len);
+ if (len != ICC_PROFILE_SIZE) {
+ *error = g_error_new (1, 0, "profile length invalid, got %i", len);
+ g_file_set_contents ("error.icc", icc_profile, len, NULL);
+ goto out;
+ }
+
+ /* success */
+ ret = TRUE;
+out:
+ if (pixbuf != NULL)
+ g_object_unref (pixbuf);
+ g_free (icc_profile);
+ return ret;
+}
+
+int
+main (int argc, char **argv)
+{
+ GdkWindow *root;
+ GdkPixbuf *pixbuf;
+ gboolean ret;
+ gint retval = 1;
+ GError *error = NULL;
+
+ gtk_init (&argc, &argv);
+
+ gtk_widget_set_default_colormap (gdk_rgb_get_colormap ());
+
+ root = gdk_get_default_root_window ();
+ pixbuf = gdk_pixbuf_get_from_drawable (NULL, root, NULL,
+ 0, 0, 0, 0, 150, 160);
+
+ /* PASS */
+ g_debug ("try to save PNG with a profile");
+ ret = save_image_png ("icc-profile.png", pixbuf, &error);
+ if (!ret) {
+ g_warning ("FAILED: did not save image: %s", error->message);
+ g_error_free (error);
+ goto out;
+ }
+
+ /* PASS */
+ g_debug ("try to load PNG and get color attributes");
+ ret = save_image_verify ("icc-profile.png", &error);
+ if (!ret) {
+ g_warning ("FAILED: did not load image: %s", error->message);
+ g_error_free (error);
+ goto out;
+ }
+
+ /* success */
+ retval = 0;
+ g_debug ("ALL OKAY!");
+out:
+ return retval;
+}
diff --git a/gdk-pixbuf/gdk-pixbuf-io.c b/gdk-pixbuf/gdk-pixbuf-io.c
index f8ce73d..ed765ed 100644
--- a/gdk-pixbuf/gdk-pixbuf-io.c
+++ b/gdk-pixbuf/gdk-pixbuf-io.c
@@ -1902,6 +1902,21 @@ gdk_pixbuf_real_save_to_callback (GdkPixbuf *pixbuf,
* be specified using the "compression" parameter; it's value is in an
* integer in the range of [0,9].
*
+ * ICC color profiles can also be embedded into PNG images.
+ * The "icc-profile" value should be the complete ICC profile encoded
+ * into base64.
+ *
+ * <informalexample><programlisting>
+ * gchar *contents;
+ * gchar *contents_encode;
+ * gsize length;
+ * g_file_get_contents ("/home/hughsie/.color/icc/L225W.icm", &contents, &length, NULL);
+ * contents_encode = g_base64_encode ((const guchar *) contents, length);
+ * gdk_pixbuf_save (pixbuf, handle, "png", &error,
+ * "icc-profile", contents_encode,
+ * NULL);
+ * </programlisting></informalexample>
+ *
* TIFF images recognize a "compression" option which acceps an integer value.
* Among the codecs are 1 None, 2 Huffman, 5 LZW, 7 JPEG and 8 Deflate, see
* the libtiff documentation and tiff.h for all supported codec values.
diff --git a/gdk-pixbuf/io-png.c b/gdk-pixbuf/io-png.c
index eecdd0f..8b90865 100644
--- a/gdk-pixbuf/io-png.c
+++ b/gdk-pixbuf/io-png.c
@@ -258,6 +258,12 @@ gdk_pixbuf__png_image_load (FILE *f, GError **error)
gint num_texts;
gchar *key;
gchar *value;
+ gchar *icc_profile_base64;
+ const gchar *icc_profile_title;
+ const gchar *icc_profile;
+ guint icc_profile_size;
+ guint32 retval;
+ gint compression_type;
#ifdef PNG_USER_MEM_SUPPORTED
png_ptr = png_create_read_struct_2 (PNG_LIBPNG_VER_STRING,
@@ -332,6 +338,18 @@ gdk_pixbuf__png_image_load (FILE *f, GError **error)
}
}
+#if defined(PNG_cHRM_SUPPORTED)
+ /* Extract embedded ICC profile */
+ retval = png_get_iCCP (png_ptr, info_ptr,
+ (png_charpp) &icc_profile_title, &compression_type,
+ (png_charpp) &icc_profile, (png_uint_32*) &icc_profile_size);
+ if (retval != 0) {
+ icc_profile_base64 = g_base64_encode ((const guchar *) icc_profile, icc_profile_size);
+ gdk_pixbuf_set_option (pixbuf, "icc-profile", icc_profile_base64);
+ g_free (icc_profile_base64);
+ }
+#endif
+
g_free (rows);
png_destroy_read_struct (&png_ptr, &info_ptr, NULL);
@@ -586,7 +604,13 @@ png_info_callback (png_structp png_read_ptr,
int i, num_texts;
int color_type;
gboolean have_alpha = FALSE;
-
+ gchar *icc_profile_base64;
+ const gchar *icc_profile_title;
+ const gchar *icc_profile;
+ guint icc_profile_size;
+ guint32 retval;
+ gint compression_type;
+
lc = png_get_progressive_ptr(png_read_ptr);
if (lc->fatal_error_occurred)
@@ -651,11 +675,23 @@ png_info_callback (png_structp png_read_ptr,
}
}
+#if defined(PNG_cHRM_SUPPORTED)
+ /* Extract embedded ICC profile */
+ retval = png_get_iCCP (png_read_ptr, png_info_ptr,
+ (png_charpp) &icc_profile_title, &compression_type,
+ (png_charpp) &icc_profile, (png_uint_32*) &icc_profile_size);
+ if (retval != 0) {
+ icc_profile_base64 = g_base64_encode ((const guchar *) icc_profile, icc_profile_size);
+ gdk_pixbuf_set_option (lc->pixbuf, "icc-profile", icc_profile_base64);
+ g_free (icc_profile_base64);
+ }
+#endif
+
/* Notify the client that we are ready to go */
if (lc->prepare_func)
(* lc->prepare_func) (lc->pixbuf, NULL, lc->notify_user_data);
-
+
return;
}
@@ -791,7 +827,7 @@ static gboolean real_save_png (GdkPixbuf *pixbuf,
GdkPixbufSaveFunc save_func,
gpointer user_data)
{
- png_structp png_ptr;
+ png_structp png_ptr = NULL;
png_infop info_ptr;
png_textp text_ptr = NULL;
guchar *ptr;
@@ -806,6 +842,8 @@ static gboolean real_save_png (GdkPixbuf *pixbuf,
int num_keys;
int compression = -1;
gboolean success = TRUE;
+ guchar *icc_profile = NULL;
+ gsize icc_profile_size = 0;
SaveToFunctionIoPtr to_callback_ioptr;
num_keys = 0;
@@ -823,7 +861,8 @@ static gboolean real_save_png (GdkPixbuf *pixbuf,
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;
+ success = FALSE;
+ goto cleanup;
}
for (i = 0; i < len; i++) {
if ((guchar) key[i] > 127) {
@@ -831,10 +870,24 @@ static gboolean real_save_png (GdkPixbuf *pixbuf,
GDK_PIXBUF_ERROR,
GDK_PIXBUF_ERROR_BAD_OPTION,
_("Keys for PNG text chunks must be ASCII characters."));
- return FALSE;
+ success = FALSE;
+ goto cleanup;
}
}
num_keys++;
+ } else if (strcmp (*kiter, "icc-profile") == 0) {
+ /* decode from base64 */
+ icc_profile = g_base64_decode (*viter, &icc_profile_size);
+ if (icc_profile_size < 127) {
+ /* This is a user-visible error */
+ g_set_error (error,
+ GDK_PIXBUF_ERROR,
+ GDK_PIXBUF_ERROR_BAD_OPTION,
+ _("Color profile has invalid length '%d'."),
+ icc_profile_size);
+ success = FALSE;
+ goto cleanup;
+ }
} else if (strcmp (*kiter, "compression") == 0) {
char *endptr = NULL;
compression = strtol (*viter, &endptr, 10);
@@ -845,7 +898,8 @@ static gboolean real_save_png (GdkPixbuf *pixbuf,
GDK_PIXBUF_ERROR_BAD_OPTION,
_("PNG compression level must be a value between 0 and 9; value '%s' could not be parsed."),
*viter);
- return FALSE;
+ success = FALSE;
+ goto cleanup;
}
if (compression < 0 || compression > 9) {
/* This is a user-visible error;
@@ -857,7 +911,8 @@ static gboolean real_save_png (GdkPixbuf *pixbuf,
GDK_PIXBUF_ERROR_BAD_OPTION,
_("PNG compression level must be a value between 0 and 9; value '%d' is not allowed."),
compression);
- return FALSE;
+ success = FALSE;
+ goto cleanup;
}
} else {
g_warning ("Unrecognized parameter (%s) passed to PNG saver.", *kiter);
@@ -947,6 +1002,15 @@ static gboolean real_save_png (GdkPixbuf *pixbuf,
if (compression >= 0)
png_set_compression_level (png_ptr, compression);
+#if defined(PNG_iCCP_SUPPORTED)
+ /* the proper ICC profile title is encoded in the profile */
+ if (icc_profile != NULL) {
+ png_set_iCCP (png_ptr, info_ptr,
+ "ICC profile", PNG_COMPRESSION_TYPE_BASE,
+ (gchar*) icc_profile, icc_profile_size);
+ }
+#endif
+
if (has_alpha) {
png_set_IHDR (png_ptr, info_ptr, w, h, bpc,
PNG_COLOR_TYPE_RGB_ALPHA, PNG_INTERLACE_NONE,
@@ -975,13 +1039,16 @@ static gboolean real_save_png (GdkPixbuf *pixbuf,
png_write_end (png_ptr, info_ptr);
cleanup:
- png_destroy_write_struct (&png_ptr, &info_ptr);
+ if (png_ptr != NULL)
+ 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);
- }
+ g_free (icc_profile);
+
+ if (text_ptr != NULL) {
+ for (i = 0; i < num_keys; i++)
+ g_free (text_ptr[i].text);
+ g_free (text_ptr);
+ }
return success;
}
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