237 lines
6.9 KiB
C
237 lines
6.9 KiB
C
/* gdkpixbufdecoder.c
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Copyright (C) 1999, 2003 Free Software Foundation, Inc.
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This file is part of GNU Classpath.
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GNU Classpath is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2, or (at your option)
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any later version.
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GNU Classpath is distributed in the hope that it will be useful, but
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WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with GNU Classpath; see the file COPYING. If not, write to the
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Free Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
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02111-1307 USA.
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Linking this library statically or dynamically with other modules is
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making a combined work based on this library. Thus, the terms and
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conditions of the GNU General Public License cover the whole
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combination.
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As a special exception, the copyright holders of this library give you
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permission to link this library with independent modules to produce an
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executable, regardless of the license terms of these independent
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modules, and to copy and distribute the resulting executable under
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terms of your choice, provided that you also meet, for each linked
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independent module, the terms and conditions of the license of that
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module. An independent module is a module which is not derived from
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or based on this library. If you modify this library, you may extend
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this exception to your version of the library, but you are not
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obligated to do so. If you do not wish to do so, delete this
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exception statement from your version. */
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#include <gtk/gtk.h>
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#include <gdk-pixbuf/gdk-pixbuf.h>
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#include <gdk-pixbuf/gdk-pixbuf-loader.h>
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#include "gtkpeer.h"
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#include "gnu_java_awt_peer_gtk_GdkPixbufDecoder.h"
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struct state_table *native_pixbufdecoder_state_table;
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#define NSA_PB_INIT(env, clazz) \
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native_pixbufdecoder_state_table = init_state_table (env, clazz)
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#define NSA_GET_PB_PTR(env, obj) \
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get_state (env, obj, native_pixbufdecoder_state_table)
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#define NSA_SET_PB_PTR(env, obj, ptr) \
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set_state (env, obj, native_pixbufdecoder_state_table, (void *)ptr)
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#define NSA_DEL_PB_PTR(env, obj) \
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remove_state_slot (env, obj, native_pixbufdecoder_state_table)
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jmethodID areaPreparedID;
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jmethodID areaUpdatedID;
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static void
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area_prepared (GdkPixbufLoader *loader,
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jobject *decoder)
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{
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jint width, height;
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GdkPixbuf *pixbuf = gdk_pixbuf_loader_get_pixbuf (loader);
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if (pixbuf == NULL)
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return;
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width = gdk_pixbuf_get_width (pixbuf);
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height = gdk_pixbuf_get_height (pixbuf);
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gdk_threads_leave ();
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g_assert (decoder != NULL);
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(*gdk_env)->CallVoidMethod (gdk_env,
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*decoder,
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areaPreparedID,
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width, height);
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gdk_threads_enter ();
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}
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static void
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area_updated (GdkPixbufLoader *loader,
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gint x, gint y,
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gint width, gint height,
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jobject *decoder)
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{
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jint stride_bytes, stride_pixels, n_channels, n_pixels;
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int i, px;
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jintArray jpixels;
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jint *java_pixels;
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guchar *gdk_pixels;
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GdkPixbuf *pixbuf_no_alpha = NULL;
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GdkPixbuf *pixbuf = NULL;
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pixbuf_no_alpha = gdk_pixbuf_loader_get_pixbuf (loader);
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if (pixbuf_no_alpha == NULL)
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return;
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pixbuf = gdk_pixbuf_add_alpha(pixbuf_no_alpha, FALSE, 0, 0, 0);
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g_assert (gdk_pixbuf_get_has_alpha (pixbuf));
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stride_bytes = gdk_pixbuf_get_rowstride (pixbuf);
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n_channels = gdk_pixbuf_get_n_channels (pixbuf);
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stride_pixels = stride_bytes / n_channels;
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n_pixels = height * stride_pixels;
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gdk_pixels = gdk_pixbuf_get_pixels (pixbuf);
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jpixels = (*gdk_env)->NewIntArray (gdk_env, n_pixels);
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java_pixels = (*gdk_env)->GetIntArrayElements (gdk_env, jpixels, NULL);
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memcpy (java_pixels,
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gdk_pixels + (y * stride_bytes),
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(height * stride_bytes));
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for (i = 0; i < n_pixels; ++i)
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{
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px = java_pixels[i];
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/* move alpha around (GdkPixbufLoader results are AGBR not GBRA, in
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the lsb sense) */
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/* px = ((px >> 24) & 0xff) | ((px << 8) & 0xffffff00); */
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/* it appears to require a full byte swap, now, not just a shift to
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the A channel. why did this change? don't know. */
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px = ((px >> 8) & 0x00ff00ff) | ((px << 8) & 0xff00ff00);
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px = ((px >> 16) & 0x0000ffff) | ((px << 16) & 0xffff0000);
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java_pixels[i] = px;
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}
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g_object_unref (pixbuf);
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gdk_threads_leave ();
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(*gdk_env)->ReleaseIntArrayElements (gdk_env, jpixels, java_pixels, 0);
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(*gdk_env)->CallVoidMethod (gdk_env,
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*decoder,
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areaUpdatedID,
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(jint) x, (jint) y,
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(jint) width, (jint) height,
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jpixels,
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stride_pixels);
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gdk_threads_enter ();
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}
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static void
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closed (GdkPixbufLoader *loader __attribute__((unused)), jobject *decoder)
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{
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gdk_threads_leave ();
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(*gdk_env)->DeleteGlobalRef (gdk_env, *decoder);
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free (decoder);
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gdk_threads_enter ();
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}
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JNIEXPORT void JNICALL Java_gnu_java_awt_peer_gtk_GdkPixbufDecoder_initState
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(JNIEnv *env, jobject obj)
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{
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GdkPixbufLoader *loader = NULL;
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jobject *decoder = NULL;
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decoder = (jobject *) malloc (sizeof (jobject));
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g_assert (decoder != NULL);
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*decoder = (*env)->NewGlobalRef (env, obj);
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gdk_threads_enter ();
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loader = gdk_pixbuf_loader_new ();
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g_assert (loader != NULL);
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g_signal_connect (loader, "area-prepared", G_CALLBACK (area_prepared), decoder);
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g_signal_connect (loader, "area-updated", G_CALLBACK (area_updated), decoder);
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g_signal_connect (loader, "closed", G_CALLBACK (closed), decoder);
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gdk_threads_leave ();
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NSA_SET_PB_PTR (env, obj, loader);
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}
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JNIEXPORT void JNICALL Java_gnu_java_awt_peer_gtk_GdkPixbufDecoder_initStaticState
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(JNIEnv *env, jclass clazz)
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{
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areaPreparedID = (*env)->GetMethodID (env, clazz,
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"areaPrepared",
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"(II)V");
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areaUpdatedID = (*env)->GetMethodID (env, clazz,
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"areaUpdated",
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"(IIII[II)V");
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NSA_PB_INIT (env, clazz);
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}
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JNIEXPORT void JNICALL Java_gnu_java_awt_peer_gtk_GdkPixbufDecoder_finish
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(JNIEnv *env, jobject obj)
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{
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GdkPixbufLoader *loader = NULL;
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loader = (GdkPixbufLoader *)NSA_DEL_PB_PTR (env, obj);
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if (loader == NULL)
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return;
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gdk_threads_enter ();
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gdk_pixbuf_loader_close (loader, NULL);
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g_object_unref (loader);
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gdk_threads_leave ();
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}
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JNIEXPORT void JNICALL Java_gnu_java_awt_peer_gtk_GdkPixbufDecoder_pumpBytes
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(JNIEnv *env, jobject obj, jbyteArray jarr, jint len)
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{
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GdkPixbufLoader *loader = NULL;
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jbyte *bytes = NULL;
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if (len < 1)
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return;
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bytes = (*gdk_env)->GetByteArrayElements (gdk_env, jarr, NULL);
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g_assert (bytes != NULL);
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loader = (GdkPixbufLoader *)NSA_GET_PB_PTR (env, obj);
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g_assert (loader != NULL);
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gdk_threads_enter ();
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gdk_pixbuf_loader_write (loader, bytes, len, NULL);
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gdk_threads_leave ();
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(*gdk_env)->ReleaseByteArrayElements (gdk_env, jarr, bytes, 0);
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}
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