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