435 lines
11 KiB
C
435 lines
11 KiB
C
/* gtkimage.c
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Copyright (C) 2005, 2006, 2007 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., 51 Franklin Street, Fifth Floor, Boston, MA
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02110-1301 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 "jcl.h"
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#include "gtkpeer.h"
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#include "gnu_java_awt_peer_gtk_GtkImage.h"
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/* The constant fields in java.awt.Image */
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#define SCALE_DEFAULT 1
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#define SCALE_FAST 2
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#define SCALE_SMOOTH 4
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#define SCALE_REPLICATE 8
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#define SCALE_AREA_AVERAGING 16
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/* local stuff */
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static GdkInterpType mapHints(jint hints);
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static void createRawData (JNIEnv * env, jobject obj, void *ptr);
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static void setWidthHeight (JNIEnv * env, jobject obj, int width, int height);
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/**
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* Loads a pixbuf from a file.
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*/
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JNIEXPORT jboolean JNICALL
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Java_gnu_java_awt_peer_gtk_GtkImage_loadPixbuf
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(JNIEnv *env, jobject obj, jstring name)
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{
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const char *filename;
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int width, height;
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GdkPixbuf *pixbuf;
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/* Don't use the JCL convert function because it throws an exception
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on failure */
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filename = (*env)->GetStringUTFChars (env, name, 0);
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if (filename == NULL)
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return JNI_FALSE;
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pixbuf = gdk_pixbuf_new_from_file (filename, NULL);
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if (pixbuf == NULL)
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{
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(*env)->ReleaseStringUTFChars (env, name, filename);
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return JNI_FALSE;
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}
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width = gdk_pixbuf_get_width (pixbuf);
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height = gdk_pixbuf_get_height (pixbuf);
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createRawData (env, obj, pixbuf);
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setWidthHeight(env, obj, width, height);
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(*env)->ReleaseStringUTFChars (env, name, filename);
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return JNI_TRUE;
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}
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/*
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* Creates the image from an array of java bytes.
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*/
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JNIEXPORT jboolean JNICALL
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Java_gnu_java_awt_peer_gtk_GtkImage_loadImageFromData
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(JNIEnv *env, jobject obj, jbyteArray data)
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{
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jbyte *src;
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GdkPixbuf* pixbuf;
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GdkPixbufLoader* loader;
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int len;
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int width;
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int height;
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src = (*env)->GetByteArrayElements (env, data, NULL);
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len = (*env)->GetArrayLength (env, data);
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loader = gdk_pixbuf_loader_new ();
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gdk_pixbuf_loader_write (loader, (guchar *)src, len, NULL);
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gdk_pixbuf_loader_close (loader, NULL);
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(*env)->ReleaseByteArrayElements (env, data, src, 0);
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pixbuf = gdk_pixbuf_loader_get_pixbuf (loader);
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if (pixbuf == NULL)
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{
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g_object_unref (loader);
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createRawData (env, obj, NULL);
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return JNI_FALSE;
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}
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g_object_ref (pixbuf);
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g_object_unref (loader);
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width = gdk_pixbuf_get_width (pixbuf);
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height = gdk_pixbuf_get_height (pixbuf);
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createRawData (env, obj, pixbuf);
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setWidthHeight(env, obj, width, height);
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return JNI_TRUE;
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}
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JNIEXPORT void JNICALL
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Java_gnu_java_awt_peer_gtk_GtkImage_createFromPixbuf
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(JNIEnv *env, jobject obj)
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{
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int width, heigth;
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GdkPixbuf *pixbuf = cp_gtk_image_get_pixbuf (env, obj);
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width = gdk_pixbuf_get_width (pixbuf);
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heigth = gdk_pixbuf_get_height (pixbuf);
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setWidthHeight(env, obj, width, heigth);
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}
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/**
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* Returns a copy of the pixel data as a java array.
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*/
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JNIEXPORT jintArray JNICALL
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Java_gnu_java_awt_peer_gtk_GtkImage_getPixels(JNIEnv *env, jobject obj)
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{
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GdkPixbuf *pixbuf;
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int width, height, rowstride;
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guchar *pixeldata;
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jintArray result_array;
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jint *result_array_iter, *dst;
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int i,j;
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gdk_threads_enter ();
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pixbuf = cp_gtk_image_get_pixbuf (env, obj);
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width = gdk_pixbuf_get_width (pixbuf);
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height = gdk_pixbuf_get_height (pixbuf);
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rowstride = gdk_pixbuf_get_rowstride (pixbuf);
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result_array = (*env)->NewIntArray (env, (width * height));
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if (result_array == NULL)
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{
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gdk_threads_leave ();
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return NULL;
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}
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dst = result_array_iter =
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(*env)->GetIntArrayElements (env, result_array, NULL);
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pixeldata = gdk_pixbuf_get_pixels (pixbuf);
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g_assert (gdk_pixbuf_get_bits_per_sample (pixbuf) == 8);
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if (gdk_pixbuf_get_has_alpha (pixbuf))
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{
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for(i = 0 ; i < height; i++)
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{
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memcpy(dst, (void *)pixeldata, width * 4);
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dst += width;
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pixeldata += rowstride;
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}
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} else {
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/* Add a default alpha value of 0xFF to the pixeldata without alpha
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information and keep it in the same format as the pixeldata with alpha
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information. On Little Endian systems: AABBGGRR and on Big Endian
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systems: RRGGBBAA. */
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for(i = 0; i < height; i++)
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{
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for(j = 0; j < width; j++)
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#ifndef WORDS_BIGENDIAN
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dst[j] = 0xFF000000
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| (pixeldata[j*3 + 2] & 0xFF) << 16
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| (pixeldata[j*3 + 1] & 0xFF) << 8
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| (pixeldata[j*3] & 0xFF);
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#else
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dst[j] = (pixeldata[j*3] & 0xFF) << 24
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| (pixeldata[j*3 + 1] & 0xFF) << 16
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| (pixeldata[j*3 + 2] & 0xFF) << 8
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| 0xFF;
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#endif
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dst += width;
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pixeldata += rowstride;
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}
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}
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(*env)->ReleaseIntArrayElements (env, result_array, result_array_iter, 0);
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gdk_threads_leave ();
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return result_array;
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}
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/**
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* Returns a copy of the pixel data as a java array.
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* (GdkPixbuf only)
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*/
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JNIEXPORT void JNICALL
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Java_gnu_java_awt_peer_gtk_GtkImage_setPixels(JNIEnv *env, jobject obj,
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jintArray pixels)
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{
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GdkPixbuf *pixbuf = cp_gtk_image_get_pixbuf (env, obj);
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int width, height, rowstride;
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guchar *pixeldata;
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jint *src_array_iter, *src;
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int i;
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width = gdk_pixbuf_get_width (pixbuf);
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height = gdk_pixbuf_get_height (pixbuf);
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rowstride = gdk_pixbuf_get_rowstride (pixbuf);
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src = src_array_iter =
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(*env)->GetIntArrayElements (env, pixels, NULL);
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pixeldata = gdk_pixbuf_get_pixels (pixbuf);
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for(i = 0 ; i < height; i++)
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{
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memcpy((void *)pixeldata, (void *)src, width * 4);
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src += width;
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pixeldata += rowstride;
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}
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(*env)->ReleaseIntArrayElements (env, pixels, src_array_iter, 0);
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}
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/**
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* Allocates a Gtk Pixbuf
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*/
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JNIEXPORT void JNICALL
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Java_gnu_java_awt_peer_gtk_GtkImage_createPixbuf(JNIEnv *env, jobject obj)
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{
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int width, height;
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jclass cls;
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jfieldID field;
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cls = (*env)->GetObjectClass (env, obj);
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field = (*env)->GetFieldID (env, cls, "width", "I");
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g_assert (field != 0);
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width = (*env)->GetIntField (env, obj, field);
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field = (*env)->GetFieldID (env, cls, "height", "I");
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g_assert (field != 0);
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height = (*env)->GetIntField (env, obj, field);
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createRawData (env, obj, gdk_pixbuf_new (GDK_COLORSPACE_RGB,
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TRUE,
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8,
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width,
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height));
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}
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/**
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* Allocates a Gtk Pixbuf
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*/
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JNIEXPORT void JNICALL
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Java_gnu_java_awt_peer_gtk_GtkImage_initFromBuffer(JNIEnv *env, jobject obj,
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jlong bufferPointer)
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{
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int width, height;
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jclass cls;
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jfieldID field;
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GdkPixbuf *pixbuf;
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const guchar *bp = JLONG_TO_PTR(const guchar, bufferPointer);
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g_assert(bp != NULL);
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cls = (*env)->GetObjectClass( env, obj );
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field = (*env)->GetFieldID( env, cls, "width", "I" );
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g_assert( field != 0 );
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width = (*env)->GetIntField( env, obj, field );
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field = (*env)->GetFieldID( env, cls, "height", "I" );
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g_assert( field != 0 );
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height = (*env)->GetIntField( env, obj, field );
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pixbuf = gdk_pixbuf_new_from_data( bp,
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GDK_COLORSPACE_RGB, TRUE, 8,
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width, height, width * 4, NULL, NULL );
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g_assert( pixbuf != NULL );
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createRawData( env, obj, pixbuf );
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}
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/**
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* Frees the Gtk Pixbuf.
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*/
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JNIEXPORT void JNICALL
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Java_gnu_java_awt_peer_gtk_GtkImage_freePixbuf(JNIEnv *env, jobject obj)
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{
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gdk_pixbuf_unref (cp_gtk_image_get_pixbuf (env, obj));
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}
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/**
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* Sets this to a scaled version of the original pixbuf
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* width and height of the destination GtkImage must be set.
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*/
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JNIEXPORT void JNICALL
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Java_gnu_java_awt_peer_gtk_GtkImage_createScaledPixbuf(JNIEnv *env,
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jobject destination,
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jobject source,
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jint hints)
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{
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GdkPixbuf* dst;
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int width, height;
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jclass cls;
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jfieldID field;
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GdkPixbuf *pixbuf;
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cls = (*env)->GetObjectClass (env, destination);
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field = (*env)->GetFieldID (env, cls, "width", "I");
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g_assert (field != 0);
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width = (*env)->GetIntField (env, destination, field);
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field = (*env)->GetFieldID (env, cls, "height", "I");
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g_assert (field != 0);
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height = (*env)->GetIntField (env, destination, field);
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pixbuf = cp_gtk_image_get_pixbuf (env, source);
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dst = gdk_pixbuf_scale_simple(pixbuf,
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width, height,
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mapHints(hints));
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createRawData (env, destination, (void *)dst);
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}
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/**
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* Used by GtkFramePeer
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*/
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GdkPixbuf *cp_gtk_image_get_pixbuf (JNIEnv *env, jobject obj)
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{
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jclass cls;
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jfieldID data_fid;
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jobject data;
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cls = (*env)->GetObjectClass (env, obj);
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data_fid = (*env)->GetFieldID (env, cls, "pixbuf",
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"Lgnu/classpath/Pointer;");
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g_assert (data_fid != 0);
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data = (*env)->GetObjectField (env, obj, data_fid);
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if (data == NULL)
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return NULL;
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return (GdkPixbuf *)JCL_GetRawData (env, data);
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}
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/**
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* Maps java.awt.Image scaling hints to the native GDK ones.
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*/
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static GdkInterpType mapHints(jint hints)
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{
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switch ( hints )
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{
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/* For FAST, we use the nearest-neighbor. Fastest and lowest quality. */
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case SCALE_FAST:
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case SCALE_REPLICATE:
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return GDK_INTERP_NEAREST;
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/* Hyperbolic for smooth. Slowest too. */
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case SCALE_SMOOTH:
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return GDK_INTERP_HYPER;
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/* the inbetweenish method */
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case SCALE_AREA_AVERAGING:
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return GDK_INTERP_TILES;
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/* default to bilinear */
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}
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return GDK_INTERP_BILINEAR;
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}
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/* Sets the width and height fields of a GtkImage object. */
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static void setWidthHeight (JNIEnv * env, jobject obj, int width, int height)
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{
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jclass cls;
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jfieldID field;
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cls = (*env)->GetObjectClass (env, obj);
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g_assert (cls != 0);
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field = (*env)->GetFieldID (env, cls, "width", "I");
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g_assert (field != 0);
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(*env)->SetIntField (env, obj, field, (jint)width);
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field = (*env)->GetFieldID (env, cls, "height", "I");
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g_assert (field != 0);
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(*env)->SetIntField (env, obj, field, (jint)height);
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}
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/* Store and get the pixbuf pointer */
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static void
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createRawData (JNIEnv * env, jobject obj, void *ptr)
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{
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jclass cls;
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jobject data;
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jfieldID data_fid;
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cls = (*env)->GetObjectClass (env, obj);
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data_fid = (*env)->GetFieldID (env, cls, "pixbuf",
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"Lgnu/classpath/Pointer;");
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g_assert (data_fid != 0);
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data = JCL_NewRawDataObject (env, ptr);
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(*env)->SetObjectField (env, obj, data_fid, data);
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}
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