libjava/classpath/native/jni/gtk-peer/gnu_java_awt_peer_gtk_GtkVolatileImage.c

   1 /* gnu_java_awt_peer_gtk_VolatileImage.c
   2    Copyright (C)  2006 Free Software Foundation, Inc.
   3
   4 This file is part of GNU Classpath.
   5
   6 GNU Classpath is free software; you can redistribute it and/or modify
   7 it under the terms of the GNU General Public License as published by
   8 the Free Software Foundation; either version 2, or (at your option)
   9 any later version.
  10
  11 GNU Classpath is distributed in the hope that it will be useful, but
  12 WITHOUT ANY WARRANTY; without even the implied warranty of
  13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  14 General Public License for more details.
  15
  16 You should have received a copy of the GNU General Public License
  17 along with GNU Classpath; see the file COPYING.  If not, write to the
  18 Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
  19 02110-1301 USA.
  20
  21 Linking this library statically or dynamically with other modules is
  22 making a combined work based on this library.  Thus, the terms and
  23 conditions of the GNU General Public License cover the whole
  24 combination.
  25
  26 As a special exception, the copyright holders of this library give you
  27 permission to link this library with independent modules to produce an
  28 executable, regardless of the license terms of these independent
  29 modules, and to copy and distribute the resulting executable under
  30 terms of your choice, provided that you also meet, for each linked
  31 independent module, the terms and conditions of the license of that
  32 module.  An independent module is a module which is not derived from
  33 or based on this library.  If you modify this library, you may extend
  34 this exception to your version of the library, but you are not
  35 obligated to do so.  If you do not wish to do so, delete this
  36 exception statement from your version. */
  37
  38 #include "jcl.h"
  39 #include "gtkpeer.h"
  40 #include <gdk/gdktypes.h>
  41 #include <gdk/gdkprivate.h>
  42 #include <gdk-pixbuf/gdk-pixbuf.h>
  43 #include <gdk-pixbuf/gdk-pixdata.h>
  44
  45 #include "gnu_java_awt_peer_gtk_GtkVolatileImage.h"
  46 #include "cairographics2d.h"
  47
  48
  49 /**
  50  * Creates a cairo surface, ARGB32, native ordering, premultiplied alpha.
  51  */
  52 JNIEXPORT jlong JNICALL
  53 Java_gnu_java_awt_peer_gtk_GtkVolatileImage_init (JNIEnv *env,
  54                                                   jobject obj __attribute__ ((__unused__)),
  55                                                   jobject peer,
  56                                                   jint width, jint height)
  57 {
  58   GtkWidget *widget = NULL;
  59   GdkPixmap* pixmap;
  60   void *ptr = NULL;
  61
  62   gdk_threads_enter();
  63
  64   if( peer != NULL )
  65     {
  66       ptr = gtkpeer_get_widget (env, peer);
  67       g_assert (ptr != NULL);
  68
  69       widget = GTK_WIDGET (ptr);
  70       g_assert (widget != NULL);
  71       pixmap = gdk_pixmap_new( widget->window, width, height, -1 );
  72     }
  73   else
  74     pixmap = gdk_pixmap_new( NULL, width, height,
  75                              gdk_rgb_get_visual()->depth );
  76
  77   gdk_threads_leave();
  78
  79   g_assert( pixmap != NULL );
  80
  81   return PTR_TO_JLONG( pixmap );
  82 }
  83
  84 /**
  85  * Destroy the surface
  86  */
  87 JNIEXPORT void JNICALL
  88 Java_gnu_java_awt_peer_gtk_GtkVolatileImage_destroy
  89 (JNIEnv *env __attribute__((unused)), jobject obj __attribute__((unused)),
  90  jlong pointer)
  91 {
  92   GdkPixmap* pixmap = JLONG_TO_PTR(GdkPixmap, pointer);
  93   if( pixmap != NULL )
  94     {
  95       gdk_threads_enter();
  96       g_object_unref( pixmap );
  97       gdk_threads_leave();
  98     }
  99 }
 100
 101 /**
 102  * Gets all pixels in an array
 103  */
 104 JNIEXPORT jintArray JNICALL
 105 Java_gnu_java_awt_peer_gtk_GtkVolatileImage_nativeGetPixels
 106 (JNIEnv *env, jobject obj, jlong pointer)
 107 {
 108   /* jint *pixeldata, *jpixdata; */
 109   jint *jpixdata;
 110   GdkPixmap *pixmap;
 111   GdkPixbuf *pixbuf;
 112   jintArray jpixels;
 113   int width, height, depth, size;
 114   jclass cls;
 115   jfieldID field;
 116   guchar *pixels;
 117
 118   cls = (*env)->GetObjectClass (env, obj);
 119   field = (*env)->GetFieldID (env, cls, "width", "I");
 120   g_assert (field != 0);
 121   width = (*env)->GetIntField (env, obj, field);
 122
 123   field = (*env)->GetFieldID (env, cls, "height", "I");
 124   g_assert (field != 0);
 125   height = (*env)->GetIntField (env, obj, field);
 126
 127   pixmap = JLONG_TO_PTR(GdkPixmap, pointer);
 128   g_assert(pixmap != NULL);
 129
 130   gdk_threads_enter();
 131
 132   /* get depth in bytes */
 133   depth = gdk_drawable_get_depth( pixmap ) >> 3;
 134   size = width * height;
 135   jpixels = (*env)->NewIntArray ( env, size );
 136   jpixdata = (*env)->GetIntArrayElements (env, jpixels, NULL);
 137
 138   pixbuf = gdk_pixbuf_new( GDK_COLORSPACE_RGB, TRUE, 8, width, height );
 139   gdk_pixbuf_get_from_drawable( pixbuf, pixmap, NULL, 0, 0, 0, 0, width, height );
 140
 141   if (pixbuf != NULL)
 142     {
 143       pixels = gdk_pixbuf_get_pixels(pixbuf);
 144       memcpy (jpixdata, pixels, size * sizeof(jint));
 145     }
 146
 147   (*env)->ReleaseIntArrayElements (env, jpixels, jpixdata, 0);
 148
 149   gdk_threads_leave();
 150
 151   return jpixels;
 152 }
 153
 154 /**
 155  * Copy area
 156  */
 157 JNIEXPORT void JNICALL
 158 Java_gnu_java_awt_peer_gtk_GtkVolatileImage_nativeCopyArea
 159 (JNIEnv *env __attribute__((unused)), jobject obj __attribute__((unused)),
 160  jlong pointer, jint x, jint y, jint w, jint h, jint dx, jint dy)
 161 {
 162   GdkPixbuf *pixbuf;
 163   GdkPixmap* pixmap = JLONG_TO_PTR(GdkPixmap, pointer);
 164
 165   g_assert (pixmap != NULL);
 166
 167   gdk_threads_enter();
 168
 169   pixbuf = gdk_pixbuf_new( GDK_COLORSPACE_RGB, TRUE, 8, w, h );
 170   gdk_pixbuf_get_from_drawable( pixbuf, pixmap, NULL, x, y, 0, 0, w, h );
 171   gdk_draw_pixbuf (pixmap, NULL, pixbuf,
 172                    0, 0, x + dx, y + dy,
 173                    w, h,
 174                    GDK_RGB_DITHER_NORMAL, 0, 0);
 175   gdk_threads_leave();
 176 }
 177
 178 JNIEXPORT void JNICALL
 179 Java_gnu_java_awt_peer_gtk_GtkVolatileImage_nativeDrawVolatile
 180 (JNIEnv *env __attribute__((unused)), jobject obj __attribute__((unused)),
 181  jlong pointer, jlong srcptr, jint x, jint y, jint w, jint h)
 182 {
 183   GdkPixmap *dst, *src;
 184   GdkGC *gc;
 185
 186   src = JLONG_TO_PTR(GdkPixmap, srcptr);
 187   dst = JLONG_TO_PTR(GdkPixmap, pointer);
 188   g_assert (src != NULL);
 189   g_assert (dst != NULL);
 190
 191   gdk_threads_enter();
 192
 193   gc = gdk_gc_new( dst );
 194   gdk_draw_drawable(dst,
 195                     gc,
 196                     src,
 197                     0, 0,
 198                     x, y,
 199                     w, h);
 200   g_object_unref( gc );
 201
 202   gdk_threads_leave();
 203 }
 204