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我等待將圖像從內存(jpegs和tiffs)加載到gdk_pixbuf_loader_write()中。我有加載jpeg的樣本/測試代碼很好,但無法顯示tiff圖像。 tiff圖像與其他觀衆(gnome等的眼睛)打開很好,所以tiff是有效的;我也使用imagemagick從jpegs創建tiff,這些也無法加載/顯示在我的示例代碼中。無法使用gdk_pixbuf_loader加載TIFF圖像
在我的示例代碼在後臺運行strace與TIFF圖像,我可以看到gdkpixbuf裝載機OK打開:
open("/usr/lib64/gdk-pixbuf-2.0/2.10.0/loaders.cache", O_RDONLY) = 7
...
open("/usr/lib64/gdk-pixbuf-2.0/2.10.0/loaders/libpixbufloader-tiff.so", O_RDONLY|O_CLOEXEC) = 7
有沒有什麼具體的,我需要用TIFF文件的時候處理?樣本測試程序如下。
#include <sys/types.h>
#include <sys/stat.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <glib.h>
#include <gdk-pixbuf/gdk-pixbuf.h>
#include <gtk/gtk.h>
void
on_destroy (GtkWidget * widget G_GNUC_UNUSED,
gpointer user_data G_GNUC_UNUSED)
{
gtk_main_quit();
}
int
main (int argc, char *argv[])
{
FILE *f;
struct stat st;
guint8* buffer = NULL;
gsize length = 0;
GdkPixbufLoader *loader = NULL;
GdkPixbuf *pixbuf;
GtkWidget *window;
GtkWidget *image;
GError** err_ = NULL;
if (argc == 1) {
printf("no files\n");
exit(1);
}
memset(&st, sizeof(st), 0);
stat(argv[1], &st);
if (st.st_size == 0) {
printf("%s is empty\n", argv[1]);
exit(1);
}
buffer = malloc(st.st_size);
memset(buffer, 0, st.st_size);
gtk_init (&argc, &argv);
f = fopen (argv[1], "rb");
if ((length = fread (buffer, 1, st.st_size, f)) != st.st_size) {
printf("failed to read all data from %s\n", argv[1]);
exit(1);
}
fclose (f);
if (argc == 3) {
printf("requesting loader for mimetype=%s on %s\n", argv[2], argv[1]);
loader = gdk_pixbuf_loader_new_with_mime_type(argv[2], err_);
if (err_ && *err_) {
g_error_free(*err_);
*err_ = NULL;
printf("no known loader for explicit mimetype, defaulting\n");
loader = gdk_pixbuf_loader_new();
}
}
else
{
loader = gdk_pixbuf_loader_new();
}
gdk_pixbuf_loader_write (loader, buffer, length, NULL);
pixbuf = gdk_pixbuf_loader_get_pixbuf (loader);
gdk_pixbuf_loader_close(loader, err_);
window = gtk_window_new (GTK_WINDOW_TOPLEVEL);
image = gtk_image_new_from_pixbuf (pixbuf);
gtk_container_add (GTK_CONTAINER (window), image);
gtk_widget_show_all (GTK_WIDGET (window));
g_signal_connect (window, "destroy", G_CALLBACK (on_destroy), NULL);
gtk_main();
free(buffer);
return 0;
}