2003/10/16 05:24:23

[org.ibex.core.git] / src / org / xwt / plat / GCJ.cc

diff --git a/src/org/xwt/plat/GCJ.cc b/src/org/xwt/plat/GCJ.cc
index 8d1c8b6..9a9b1bb 100644 (file)
--- a/src/org/xwt/plat/GCJ.cc
+++ b/src/org/xwt/plat/GCJ.cc
@@ -1 +1,156 @@
- 
+// Copyright 2002 Adam Megacz, see the COPYING file for licensing [LGPL]
+
+// Inclusions /////////////////////////////////////////////////////////
+
+#include <gcj/cni.h>
+#include <gcj/array.h>
+extern "C" {
+
+// hack for broken Solaris headers
+#define _WCHAR_T
+
+#include <stdlib.h>
+#include <stdio.h>
+#include <setjmp.h>
+#include "jpeglib.h"
+}
+#include <org/xwt/Platform.h>
+#include <org/xwt/Picture.h>
+#include <org/xwt/plat/GCJ.h>
+#include <java/io/InputStream.h>
+#include <java/io/ByteArrayInputStream.h>
+#include <java/lang/RuntimeException.h>
+#include <org/xwt/plat/GCJ.h>
+#include <org/xwt/util/Log.h>
+
+using org::xwt::util::Log;
+
+// builtin.xwar /////////////////////////////////////////////////////////
+
+extern unsigned char builtin_bytes[];
+extern int builtin_length;
+
+java::io::InputStream* org::xwt::plat::GCJ::_getBuiltinInputStream() {
+    jbyteArray ret = JvNewByteArray(builtin_length);
+    memcpy(elements(ret), builtin_bytes, builtin_length);
+    return new java::io::ByteArrayInputStream(ret);
+}
+
+
+
+// JPEG ////////////////////////////////////////////////////////////////
+
+typedef struct {
+    struct jpeg_source_mgr pub;
+    java::io::InputStream *is;
+    jbyteArray buf;
+} my_source_mgr_t;
+
+typedef struct {
+    struct jpeg_error_mgr pub;
+    jmp_buf setjmp_buffer;
+} my_error_mgr_t;
+
+static void error_exit (j_common_ptr cinfo) {
+    my_error_mgr_t *myerr = (my_error_mgr_t*) cinfo->err;
+    longjmp(myerr->setjmp_buffer,1);
+}
+
+static void term_source (j_decompress_ptr cinfo) { }
+static void init_source (j_decompress_ptr cinfo) { }
+
+boolean fill_input_buffer (j_decompress_ptr cinfo) {
+    my_source_mgr_t* src = (my_source_mgr_t*) cinfo->src;
+    JOCTET *p = (JOCTET*)elements(src->buf);
+    jint n;
+    try {
+        n = src->is->read(src->buf, 0, src->buf->length);
+    } catch(java::lang::Throwable *e) {
+        n = -1;
+    }
+    
+    src->pub.next_input_byte = p;
+    
+    if (n <= 0) {
+        // the JPEG library specifically suggests padding the end with EOF markers
+        p[0] = 0xff;
+        p[1] = JPEG_EOI;
+        src->pub.bytes_in_buffer = 2;
+    } else {
+        src->pub.bytes_in_buffer = n;
+    }
+    return 1;
+}
+
+void skip_input_data (j_decompress_ptr cinfo, long num_bytes) {
+    my_source_mgr_t* src = (my_source_mgr_t*) cinfo->src;
+    
+    if (num_bytes <= 0) return; 
+    
+    while (num_bytes > src->pub.bytes_in_buffer) {
+        num_bytes -= src->pub.bytes_in_buffer;
+        fill_input_buffer(cinfo);
+    }
+    src->pub.next_input_byte += num_bytes;
+    src->pub.bytes_in_buffer -= num_bytes;
+}
+
+org::xwt::Picture* org::xwt::plat::GCJ::_decodeJPEG(java::io::InputStream* is, jstring name) {
+    struct jpeg_decompress_struct cinfo;
+    my_error_mgr_t jerr;
+    my_source_mgr_t src;
+    jintArray data;
+    jint width;
+    jint height;
+    
+    src.is = is;
+    src.buf = JvNewByteArray(16384);
+    
+    src.pub.init_source = init_source;
+    src.pub.fill_input_buffer = fill_input_buffer;
+    src.pub.skip_input_data = skip_input_data;
+    src.pub.resync_to_restart = jpeg_resync_to_restart;
+    src.pub.term_source = term_source;
+    src.pub.next_input_byte = NULL;
+    src.pub.bytes_in_buffer = 0;
+    
+    if (setjmp(jerr.setjmp_buffer)) {
+        // FEATURE - we should handle errors better than this
+        char msgbuf[JMSG_LENGTH_MAX];
+        (jerr.pub.format_message)((j_common_ptr)&cinfo, msgbuf);
+        Log::log(&GCJ::class$,JvNewStringLatin1(msgbuf));
+        jpeg_destroy_decompress(&cinfo);
+        return 0;
+    }
+  
+    jpeg_create_decompress(&cinfo);
+    
+    cinfo.src = &src.pub;
+    cinfo.err = jpeg_std_error(&jerr.pub);
+    jerr.pub.error_exit = error_exit;
+    
+    jpeg_read_header(&cinfo,TRUE);
+    jpeg_start_decompress(&cinfo);
+    
+    width = cinfo.output_width;
+    height = cinfo.output_height;
+    data = JvNewIntArray(width * height);
+    
+    while (cinfo.output_scanline < cinfo.output_height) {
+        JSAMPLE *dest = (JSAMPLE*) (elements(data) + cinfo.output_scanline * width);
+        jpeg_read_scanlines(&cinfo,&dest,1);
+    }
+    jpeg_finish_decompress(&cinfo);
+    jpeg_destroy_decompress(&cinfo);
+    
+    for(int i=0;i<data->length;i++)
+        elements(data)[i] |= 0xff000000; // alpha channel
+    
+    return org::xwt::Platform::createPicture(data, width, height);
+}
+
+// C++ new/delete operators (JvMalloc never fails)
+void* operator new(size_t size) { return JvMalloc(size); }
+void* operator new[](size_t size) { return JvMalloc(size);}
+void operator delete(void *p) { JvFree(p); }
+void operator delete[](void *p) { JvFree(p); }