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/* gnu_java_awt_peer_gtk_ComponentGraphics.c

   Copyright (C) 2006, 2007 Free Software Foundation, Inc.

This file is part of GNU Classpath.

GNU Classpath is free software; you can redistribute it and/or modify

it under the terms of the GNU General Public License as published by

the Free Software Foundation; either version 2, or (at your option)

any later version.

GNU Classpath is distributed in the hope that it will be useful, but

WITHOUT ANY WARRANTY; without even the implied warranty of

MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU

General Public License for more details.

You should have received a copy of the GNU General Public License

along with GNU Classpath; see the file COPYING.  If not, write to the

Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA

02110-1301 USA.

Linking this library statically or dynamically with other modules is

making a combined work based on this library.  Thus, the terms and

conditions of the GNU General Public License cover the whole

combination.

As a special exception, the copyright holders of this library give you

permission to link this library with independent modules to produce an

executable, regardless of the license terms of these independent

modules, and to copy and distribute the resulting executable under

terms of your choice, provided that you also meet, for each linked

independent module, the terms and conditions of the license of that

module.  An independent module is a module which is not derived from

or based on this library.  If you modify this library, you may extend

this exception to your version of the library, but you are not

obligated to do so.  If you do not wish to do so, delete this

exception statement from your version. */

#include "jcl.h"

#include "gtkpeer.h"

#include <gdk/gdktypes.h>

#include <gdk/gdkprivate.h>

#include <gdk-pixbuf/gdk-pixbuf.h>

#include <gdk-pixbuf/gdk-pixdata.h>

#include <cairo-ft.h>

#include <stdio.h>

#include <stdlib.h>

#if HAVE_XRENDER

#include <gdk/gdkx.h>

#include <X11/extensions/Xrender.h>

#endif

#include "gnu_java_awt_peer_gtk_ComponentGraphics.h"

#include "cairographics2d.h"

static short flush_scheduled = 0;

static gboolean flush (gpointer data __attribute__((unused)))

{

  gdk_threads_enter ();

  gdk_display_flush (gdk_display_get_default ());

  flush_scheduled = 0;

  gdk_threads_leave ();

  return FALSE;

}

/* The minimum time period between calls to XFlush, in

   milliseconds. */

#define MINIMUM_FLUSH_PERIOD 20

/* schedule_flush must be called with the GDK lock held. */

static void

schedule_flush ()

{

  if (!flush_scheduled)

    {

      g_timeout_add (MINIMUM_FLUSH_PERIOD, flush, NULL);

      flush_scheduled = 1;

    }

}

void cp_gtk_grab_current_drawable(GtkWidget *widget, GdkDrawable **draw,

                                  GdkWindow **win)

{

  g_assert (widget != NULL);

  g_assert (draw != NULL);

  g_assert (win != NULL);

  *win = widget->window;

  *draw = *win;

  gdk_window_get_internal_paint_info (*win, draw, 0, 0);

}

/**

 * Returns whether the XRender extension is supported

 */

JNIEXPORT jboolean JNICALL

Java_gnu_java_awt_peer_gtk_ComponentGraphics_hasXRender

  (JNIEnv *env __attribute__ ((unused)), jclass cls __attribute__ ((unused)))

{

#if HAVE_XRENDER

  int ev = 0, err = 0;

  if( XRenderQueryExtension (GDK_DISPLAY(), &ev, &err) )

    return JNI_TRUE;

#endif

  return JNI_FALSE;

}

JNIEXPORT jlong JNICALL

Java_gnu_java_awt_peer_gtk_ComponentGraphics_initState

  (JNIEnv *env, jobject obj __attribute__ ((unused)), jobject peer)

{

  GdkDrawable *drawable;

  GtkWidget *widget;

  int width, height;

  cairo_t *cr;

  void *ptr;

  gdk_threads_enter();

  ptr = gtkpeer_get_widget (env, peer);

  g_assert (ptr != NULL);

  widget = GTK_WIDGET (ptr);

  g_assert (widget != NULL);

  drawable = widget->window;

  g_assert (drawable != NULL);

  width = widget->allocation.width;

  height = widget->allocation.height;

  cr = gdk_cairo_create(drawable);

  g_assert(cr != NULL);

  gdk_threads_leave();

  return PTR_TO_JLONG(cr);

}

JNIEXPORT jlong JNICALL

Java_gnu_java_awt_peer_gtk_ComponentGraphics_initFromVolatile

  (JNIEnv *env  __attribute__ ((unused)), jobject obj __attribute__ ((unused)),

   jlong ptr)

{

  GdkDrawable *drawable;

  cairo_t *cr;

  gdk_threads_enter();

  drawable = JLONG_TO_PTR(GdkDrawable, ptr);

  g_assert (drawable != NULL);

  cr = gdk_cairo_create (drawable);

  g_assert(cr != NULL);

  gdk_threads_leave();

  return PTR_TO_JLONG(cr);

}

JNIEXPORT void JNICALL

Java_gnu_java_awt_peer_gtk_ComponentGraphics_start_1gdk_1drawing

  (JNIEnv *env __attribute__ ((unused)), jobject obj __attribute__ ((unused)))

{

  gdk_threads_enter();

}

JNIEXPORT void JNICALL

Java_gnu_java_awt_peer_gtk_ComponentGraphics_end_1gdk_1drawing

  (JNIEnv *env __attribute__ ((unused)), jobject obj __attribute__ ((unused)))

{

  schedule_flush ();

  gdk_threads_leave();

}

JNIEXPORT void JNICALL

Java_gnu_java_awt_peer_gtk_ComponentGraphics_copyAreaNative

  (JNIEnv *env, jobject obj __attribute__((unused)), jobject peer,

   jint x, jint y, jint w, jint h, jint dx, jint dy)

{

  GdkPixbuf *pixbuf;

  GdkDrawable *drawable;

  GdkWindow *win;

  GtkWidget *widget = NULL;

  void *ptr = NULL;

  gdk_threads_enter();

  ptr = gtkpeer_get_widget (env, peer);

  g_assert (ptr != NULL);

  widget = GTK_WIDGET (ptr);

  g_assert (widget != NULL);

  cp_gtk_grab_current_drawable (widget, &drawable, &win);

  g_assert (drawable != NULL);

  pixbuf = gdk_pixbuf_new( GDK_COLORSPACE_RGB, TRUE, 8, w, h );

  gdk_pixbuf_get_from_drawable( pixbuf, drawable, NULL, x, y, 0, 0, w, h );

  gdk_draw_pixbuf (drawable, NULL, pixbuf,

                   0, 0, x + dx, y + dy,

                   w, h,

                   GDK_RGB_DITHER_NORMAL, 0, 0);

  gdk_threads_leave();

}

JNIEXPORT jobject JNICALL

Java_gnu_java_awt_peer_gtk_ComponentGraphics_nativeGrab

(JNIEnv *env, jclass cls __attribute__((unused)), jobject peer )

{

  GdkPixbuf *pixbuf;

  GdkDrawable *drawable;

  GdkWindow *win;

  gint w,h;

  GtkWidget *widget = NULL;

  void *ptr = NULL;

  gdk_threads_enter();

  ptr = gtkpeer_get_widget (env, peer);

  g_assert (ptr != NULL);

  widget = GTK_WIDGET (ptr);

  g_assert (widget != NULL);

  cp_gtk_grab_current_drawable (widget, &drawable, &win);

  g_assert (drawable != NULL);

  gdk_drawable_get_size ( drawable, &w, &h );

  pixbuf = gdk_pixbuf_new( GDK_COLORSPACE_RGB, TRUE, 8, w, h );

  gdk_pixbuf_get_from_drawable( pixbuf, drawable, NULL, 0, 0, 0, 0, w, h );

  g_object_ref( pixbuf );

  gdk_draw_pixbuf (drawable, NULL, pixbuf,

                   0, 0, 0, 0,

                   w, h,

                   GDK_RGB_DITHER_NORMAL, 0, 0);

  gdk_threads_leave();

  return JCL_NewRawDataObject (env, pixbuf);

}

JNIEXPORT void JNICALL

Java_gnu_java_awt_peer_gtk_ComponentGraphics_drawVolatile

(JNIEnv *env, jobject obj __attribute__ ((unused)), jobject peer,

 jlong img, jint x, jint y, jint w, jint h, jint cx, jint cy, jint cw, jint ch)

{

  GdkPixmap *pixmap;

  GtkWidget *widget = NULL;

  GdkGC *gc;

  GdkRectangle clip;

  void *ptr;

  gdk_threads_enter();

  ptr = gtkpeer_get_widget (env, peer);

  g_assert (ptr != NULL);

  widget = GTK_WIDGET (ptr);

  g_assert (widget != NULL);

  pixmap = JLONG_TO_PTR(GdkPixmap, img);

  gc = gdk_gc_new(widget->window);

  clip.x = cx;

  clip.y = cy;

  clip.width = cw;

  clip.height = ch;

  gdk_gc_set_clip_rectangle(gc, &clip);

  gdk_draw_drawable(widget->window,

                    gc,

                    pixmap,

                    0, 0,

                    x, y,

                    w, h);

  g_object_unref( gc );

  schedule_flush ();

  gdk_threads_leave();

}