gnu_java_awt_peer_gtk_GdkPixbufDecoder.c [plain text]
#include <gtkpeer.h>
#include <gdk/gdk.h>
#include <gdk-pixbuf/gdk-pixbuf.h>
#include <gdk-pixbuf/gdk-pixbuf-loader.h>
#include <jni.h>
#include "native_state.h"
#include "gnu_java_awt_peer_gtk_GdkPixbufDecoder.h"
#include <string.h>
#include <stdlib.h>
struct state_table *native_pixbufdecoder_state_table;
union env_union
{
void **void_env;
JNIEnv **jni_env;
};
static JavaVM *vm;
static jmethodID areaPreparedID;
static jmethodID areaUpdatedID;
static void
area_prepared (GdkPixbufLoader *loader,
jobject *decoder)
{
JNIEnv *env;
union env_union e;
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);
e.jni_env = &env;
(*vm)->GetEnv (vm, e.void_env, JNI_VERSION_1_1);
(*env)->CallVoidMethod (env,
*decoder,
areaPreparedID,
width, height);
gdk_threads_enter ();
}
static void
area_updated (GdkPixbufLoader *loader,
gint x, gint y,
gint width, gint height,
jobject *decoder)
{
JNIEnv *env;
union env_union e;
jint stride_bytes, stride_pixels, n_channels, n_pixels;
int i;
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);
e.jni_env = &env;
(*vm)->GetEnv (vm, e.void_env, JNI_VERSION_1_1);
jpixels = (*env)->NewIntArray (env, n_pixels);
java_pixels = (*env)->GetIntArrayElements (env, jpixels, NULL);
memcpy (java_pixels,
gdk_pixels + (y * stride_bytes),
(height * stride_bytes));
#ifndef WORDS_BIGENDIAN
for (i = 0; i < n_pixels; ++i)
{
java_pixels[i] = SWAPU32 ((unsigned)java_pixels[i]);
}
#endif
g_object_unref (pixbuf);
gdk_threads_leave ();
(*env)->ReleaseIntArrayElements (env, jpixels, java_pixels, 0);
(*env)->CallVoidMethod (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)
{
JNIEnv *env;
union env_union e;
e.jni_env = &env;
(*vm)->GetEnv (vm, e.void_env, JNI_VERSION_1_1);
gdk_threads_leave ();
(*env)->DeleteGlobalRef (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)
{
(*env)->GetJavaVM(env, &vm);
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 = (*env)->GetByteArrayElements (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, (const guchar *) bytes, len, NULL);
gdk_threads_leave ();
(*env)->ReleaseByteArrayElements (env, jarr, bytes, 0);
}