gnu_java_awt_peer_gtk_GdkPixbufDecoder.c [plain text]
#include <gtk/gtk.h>
#include <gdk-pixbuf/gdk-pixbuf.h>
#include <gdk-pixbuf/gdk-pixbuf-loader.h>
#include "gtkpeer.h"
#include "gnu_java_awt_peer_gtk_GdkPixbufDecoder.h"
struct state_table *native_pixbufdecoder_state_table;
#define NSA_PB_INIT(env, clazz) \
native_pixbufdecoder_state_table = init_state_table (env, clazz)
#define NSA_GET_PB_PTR(env, obj) \
get_state (env, obj, native_pixbufdecoder_state_table)
#define NSA_SET_PB_PTR(env, obj, ptr) \
set_state (env, obj, native_pixbufdecoder_state_table, (void *)ptr)
#define NSA_DEL_PB_PTR(env, obj) \
remove_state_slot (env, obj, native_pixbufdecoder_state_table)
jmethodID areaPreparedID;
jmethodID areaUpdatedID;
static void
area_prepared (GdkPixbufLoader *loader,
jobject *decoder)
{
jint width, height;
GdkPixbuf *pixbuf = gdk_pixbuf_loader_get_pixbuf (loader);
if (pixbuf == NULL)
return;
width = gdk_pixbuf_get_width (pixbuf);
height = gdk_pixbuf_get_height (pixbuf),
gdk_threads_leave ();
g_assert (decoder != NULL);
(*gdk_env)->CallVoidMethod (gdk_env,
*decoder,
areaPreparedID,
width, height);
gdk_threads_enter ();
}
static void
area_updated (GdkPixbufLoader *loader,
gint x, gint y,
gint width, gint height,
jobject *decoder)
{
jint stride_bytes, stride_pixels, n_channels, n_pixels;
int i, px;
jintArray jpixels;
jint *java_pixels;
guchar *gdk_pixels;
GdkPixbuf *pixbuf_no_alpha = NULL;
GdkPixbuf *pixbuf = NULL;
pixbuf_no_alpha = gdk_pixbuf_loader_get_pixbuf (loader);
if (pixbuf_no_alpha == NULL)
return;
pixbuf = gdk_pixbuf_add_alpha(pixbuf_no_alpha, FALSE, 0, 0, 0);
g_assert (gdk_pixbuf_get_has_alpha (pixbuf));
stride_bytes = gdk_pixbuf_get_rowstride (pixbuf);
n_channels = gdk_pixbuf_get_n_channels (pixbuf);
stride_pixels = stride_bytes / n_channels;
n_pixels = height * stride_pixels;
gdk_pixels = gdk_pixbuf_get_pixels (pixbuf);
jpixels = (*gdk_env)->NewIntArray (gdk_env, n_pixels);
java_pixels = (*gdk_env)->GetIntArrayElements (gdk_env, jpixels, NULL);
memcpy (java_pixels,
gdk_pixels + (y * stride_bytes),
(height * stride_bytes));
for (i = 0; i < n_pixels; ++i)
{
px = java_pixels[i];
px = ((px >> 8) & 0x00ff00ff) | ((px << 8) & 0xff00ff00);
px = ((px >> 16) & 0x0000ffff) | ((px << 16) & 0xffff0000);
java_pixels[i] = px;
}
g_object_unref (pixbuf);
gdk_threads_leave ();
(*gdk_env)->ReleaseIntArrayElements (gdk_env, jpixels, java_pixels, 0);
(*gdk_env)->CallVoidMethod (gdk_env,
*decoder,
areaUpdatedID,
(jint) x, (jint) y,
(jint) width, (jint) height,
jpixels,
stride_pixels);
gdk_threads_enter ();
}
static void
closed (GdkPixbufLoader *loader __attribute__((unused)), jobject *decoder)
{
gdk_threads_leave ();
(*gdk_env)->DeleteGlobalRef (gdk_env, *decoder);
free (decoder);
gdk_threads_enter ();
}
JNIEXPORT void JNICALL Java_gnu_java_awt_peer_gtk_GdkPixbufDecoder_initState
(JNIEnv *env, jobject obj)
{
GdkPixbufLoader *loader = NULL;
jobject *decoder = NULL;
decoder = (jobject *) malloc (sizeof (jobject));
g_assert (decoder != NULL);
*decoder = (*env)->NewGlobalRef (env, obj);
gdk_threads_enter ();
loader = gdk_pixbuf_loader_new ();
g_assert (loader != NULL);
g_signal_connect (loader, "area-prepared", G_CALLBACK (area_prepared), decoder);
g_signal_connect (loader, "area-updated", G_CALLBACK (area_updated), decoder);
g_signal_connect (loader, "closed", G_CALLBACK (closed), decoder);
gdk_threads_leave ();
NSA_SET_PB_PTR (env, obj, loader);
}
JNIEXPORT void JNICALL Java_gnu_java_awt_peer_gtk_GdkPixbufDecoder_initStaticState
(JNIEnv *env, jclass clazz)
{
areaPreparedID = (*env)->GetMethodID (env, clazz,
"areaPrepared",
"(II)V");
areaUpdatedID = (*env)->GetMethodID (env, clazz,
"areaUpdated",
"(IIII[II)V");
NSA_PB_INIT (env, clazz);
}
JNIEXPORT void JNICALL Java_gnu_java_awt_peer_gtk_GdkPixbufDecoder_finish
(JNIEnv *env, jobject obj)
{
GdkPixbufLoader *loader = NULL;
loader = (GdkPixbufLoader *)NSA_DEL_PB_PTR (env, obj);
if (loader == NULL)
return;
gdk_threads_enter ();
gdk_pixbuf_loader_close (loader, NULL);
g_object_unref (loader);
gdk_threads_leave ();
}
JNIEXPORT void JNICALL Java_gnu_java_awt_peer_gtk_GdkPixbufDecoder_pumpBytes
(JNIEnv *env, jobject obj, jbyteArray jarr, jint len)
{
GdkPixbufLoader *loader = NULL;
jbyte *bytes = NULL;
if (len < 1)
return;
bytes = (*gdk_env)->GetByteArrayElements (gdk_env, jarr, NULL);
g_assert (bytes != NULL);
loader = (GdkPixbufLoader *)NSA_GET_PB_PTR (env, obj);
g_assert (loader != NULL);
gdk_threads_enter ();
gdk_pixbuf_loader_write (loader, bytes, len, NULL);
gdk_threads_leave ();
(*gdk_env)->ReleaseByteArrayElements (gdk_env, jarr, bytes, 0);
}