src/org/xwt/plat/GCJ.cc

   1 // Copyright 2002 Adam Megacz, see the COPYING file for licensing [LGPL]
   2
   3 // Inclusions /////////////////////////////////////////////////////////
   4
   5 #include <gcj/cni.h>
   6 #include <gcj/array.h>
   7 extern "C" {
   8
   9 // hack for broken Solaris headers
  10 #define _WCHAR_T
  11
  12 #include <stdlib.h>
  13 #include <stdio.h>
  14 #include <setjmp.h>
  15 #include "jpeglib.h"
  16 }
  17 #include <org/xwt/Platform.h>
  18 #include <org/xwt/Picture.h>
  19 #include <org/xwt/plat/GCJ.h>
  20 #include <java/io/InputStream.h>
  21 #include <java/io/ByteArrayInputStream.h>
  22 #include <java/lang/RuntimeException.h>
  23 #include <org/xwt/plat/GCJ.h>
  24 #include <org/xwt/plat/GCJ$JPEG.h>
  25
  26
  27
  28 // builtin.xwar /////////////////////////////////////////////////////////
  29
  30 extern unsigned char builtin_bytes[];
  31 extern int builtin_length;
  32
  33 java::io::InputStream* org::xwt::plat::GCJ::_getBuiltinInputStream() {
  34     jbyteArray ret = JvNewByteArray(builtin_length);
  35     memcpy(elements(ret), builtin_bytes, builtin_length);
  36     return new java::io::ByteArrayInputStream(ret);
  37 }
  38
  39
  40
  41 // JPEG ////////////////////////////////////////////////////////////////
  42
  43 #define INPUT_BUF_SIZE (1024 * 16)
  44
  45 typedef struct {
  46     struct jpeg_source_mgr pub;
  47     org::xwt::plat::GCJ$JPEG* myself;
  48 } source_manager;
  49
  50 void jpeg_error_handler (j_common_ptr cinfo) {
  51   jstring message = JvNewStringLatin1(cinfo->err->jpeg_message_table[cinfo->err->msg_code]);
  52   throw new java::lang::RuntimeException(message);
  53 }
  54
  55 void term_source (j_decompress_ptr cinfo) { }
  56 void init_source (j_decompress_ptr cinfo) { }
  57
  58 boolean fill_input_buffer (j_decompress_ptr cinfo) {
  59   source_manager* src = (source_manager*)cinfo->src;
  60   jint nbytes = src->myself->is->read(src->myself->buffer, 0, INPUT_BUF_SIZE);
  61   if (nbytes <= 0) {
  62     // the JPEG library specifically suggests padding the end with EOF markers
  63     elements(src->myself->buffer)[0] = (jbyte)0xFF;
  64     elements(src->myself->buffer)[1] = (jbyte)JPEG_EOI;
  65     nbytes = 2;
  66   }
  67   src->pub.next_input_byte = (JOCTET*)elements(src->myself->buffer);
  68   src->pub.bytes_in_buffer = nbytes;
  69   return 1;
  70 }
  71
  72 void skip_input_data (j_decompress_ptr cinfo, long num_bytes) {
  73   source_manager* src = (source_manager*)cinfo->src;
  74   if (num_bytes > 0) {
  75     while (num_bytes > (long) src->pub.bytes_in_buffer) {
  76       num_bytes -= (long) src->pub.bytes_in_buffer;
  77       (void) fill_input_buffer(cinfo);
  78     }
  79     src->pub.next_input_byte += (size_t) num_bytes;
  80     src->pub.bytes_in_buffer -= (size_t) num_bytes;
  81   }
  82 }
  83
  84 org::xwt::Picture* org::xwt::plat::GCJ$JPEG::_decodeJPEG(java::io::InputStream* is, jstring name) {
  85     struct jpeg_decompress_struct cinfo;
  86     jIntArray data;
  87     jint width;
  88     jint height;
  89
  90     // set up our error handler
  91     struct jpeg_error_mgr error_handler;
  92     cinfo.err = jpeg_std_error(&error_handler);
  93     error_handler.error_exit = &jpeg_error_handler;
  94
  95     jpeg_create_decompress(&cinfo);
  96     try {
  97         source_manager src;
  98         buffer = JvNewByteArray(INPUT_BUF_SIZE);
  99         src.pub.init_source = init_source;
 100         src.pub.fill_input_buffer = fill_input_buffer;
 101         src.pub.skip_input_data = skip_input_data;
 102         src.pub.resync_to_restart = jpeg_resync_to_restart;
 103         src.pub.term_source = term_source;
 104         src.myself = this;
 105         src.pub.next_input_byte = (JOCTET*)elements(buffer);
 106         src.pub.bytes_in_buffer = 0;
 107         cinfo.src = (jpeg_source_mgr*)&src;
 108
 109         jpeg_read_header(&cinfo, 1);
 110         jpeg_start_decompress(&cinfo);
 111         width = cinfo.output_width;
 112         height = cinfo.output_height;
 113         data = JvNewIntArray(width * height);
 114
 115         while (cinfo.output_scanline < cinfo.output_height) {
 116           JSAMPLE* dest = (JSAMPLE*)(elements(data) + cinfo.output_scanline * width);
 117           jpeg_read_scanlines(&cinfo, &dest, 1);
 118         }
 119
 120         jpeg_finish_decompress(&cinfo);
 121
 122         // fill in the alpha components
 123         for(int i=0; i<data->length; i++)
 124           elements(data)[i] |= (jint)0xff000000;
 125
 126     } catch (java::lang::Throwable* t) {
 127         jpeg_destroy_decompress(&cinfo);
 128         throw t;
 129     }
 130     jpeg_destroy_decompress(&cinfo);
 131     return org::xwt::Platform::createPicture(data, width, height);
 132 }
 133
 134 // C++ new/delete operators (JvMalloc never fails)
 135 void* operator new(size_t size) { return JvMalloc(size); }
 136 void* operator new[](size_t size) { return JvMalloc(size);}
 137 void operator delete(void *p) { JvFree(p); }
 138 void operator delete[](void *p) { JvFree(p); }