// Licence: wxWindows licence
/////////////////////////////////////////////////////////////////////////////
-/*
- We don't put pragma implement in this file because it is already present in
- src/common/image.cpp
-*/
+#ifdef __GNUG__
+#pragma implementation "imagjpeg.h"
+#endif
// For compilers that support precompilation, includes "wx.h".
#include "wx/wxprec.h"
#include "wx/defs.h"
-#if wxUSE_LIBJPEG
+#if wxUSE_IMAGE && wxUSE_LIBJPEG
-#include "wx/image.h"
+#include "wx/imagjpeg.h"
#include "wx/bitmap.h"
#include "wx/debug.h"
#include "wx/log.h"
//------------- JPEG Data Source Manager
+#define JPEG_IO_BUFFER_SIZE 2048
+
typedef struct {
struct jpeg_source_mgr pub; /* public fields */
JOCTET* buffer; /* start of buffer */
+ wxInputStream *stream;
} my_source_mgr;
typedef my_source_mgr * my_src_ptr;
{
}
-METHODDEF(boolean) my_fill_input_buffer ( j_decompress_ptr WXUNUSED(cinfo) )
+METHODDEF(boolean) my_fill_input_buffer ( j_decompress_ptr cinfo )
{
+ my_src_ptr src = (my_src_ptr) cinfo->src;
+
+ src->pub.next_input_byte = src->buffer;
+ src->pub.bytes_in_buffer = src->stream->Read(src->buffer, JPEG_IO_BUFFER_SIZE).LastRead();
+
+ if (src->pub.bytes_in_buffer == 0) // check for end-of-stream
+ {
+ // Insert a fake EOI marker
+ src->buffer[0] = 0xFF;
+ src->buffer[1] = JPEG_EOI;
+ src->pub.bytes_in_buffer = 2;
+ }
return TRUE;
}
METHODDEF(void) my_skip_input_data ( j_decompress_ptr cinfo, long num_bytes )
{
- my_src_ptr src = (my_src_ptr) cinfo->src;
-
- src->pub.next_input_byte += (size_t) num_bytes;
- src->pub.bytes_in_buffer -= (size_t) num_bytes;
+ if (num_bytes > 0)
+ {
+ my_src_ptr src = (my_src_ptr) cinfo->src;
+
+ while (num_bytes > (long)src->pub.bytes_in_buffer)
+ {
+ num_bytes -= (long) src->pub.bytes_in_buffer;
+ src->pub.fill_input_buffer(cinfo);
+ }
+ src->pub.next_input_byte += (size_t) num_bytes;
+ src->pub.bytes_in_buffer -= (size_t) num_bytes;
+ }
}
METHODDEF(void) my_term_source ( j_decompress_ptr cinfo )
{
my_src_ptr src = (my_src_ptr) cinfo->src;
- free (src->buffer);
+ if (src->pub.bytes_in_buffer > 0)
+ src->stream->SeekI(-(long)src->pub.bytes_in_buffer, wxFromCurrent);
+ delete[] src->buffer;
}
void jpeg_wxio_src( j_decompress_ptr cinfo, wxInputStream& infile )
src = (my_src_ptr) cinfo->src;
}
src = (my_src_ptr) cinfo->src;
- src->pub.bytes_in_buffer = infile.GetSize(); /* forces fill_input_buffer on first read */
- src->buffer = (JOCTET *) malloc (infile.GetSize());
- src->pub.next_input_byte = src->buffer; /* until buffer loaded */
- infile.Read(src->buffer, infile.GetSize());
+ src->pub.bytes_in_buffer = 0; /* forces fill_input_buffer on first read */
+ src->buffer = new JOCTET[JPEG_IO_BUFFER_SIZE];
+ src->pub.next_input_byte = NULL; /* until buffer loaded */
+ src->stream = &infile;
src->pub.init_source = my_init_source;
src->pub.fill_input_buffer = my_fill_input_buffer;
longjmp(myerr->setjmp_buffer, 1);
}
-
+// temporarily disable the warning C4611 (interaction between '_setjmp' and
+// C++ object destruction is non-portable) - I don't see any dtors here
+#ifdef __VISUALC__
+ #pragma warning(disable:4611)
+#endif /* VC++ */
bool wxJPEGHandler::LoadFile( wxImage *image, wxInputStream& stream, bool verbose, int WXUNUSED(index) )
{
/* If we get here, the JPEG code has signaled an error.
* We need to clean up the JPEG object, close the input file, and return.
*/
- if (verbose)
+ if (verbose)
wxLogError(_("JPEG: Couldn't load - file is probably corrupted."));
jpeg_destroy_decompress(&cinfo);
if (image->Ok()) image->Destroy();
return TRUE;
}
-
-
-
-
typedef struct {
struct jpeg_destination_mgr pub;
if (!verbose) cinfo.err->output_message=NULL;
/* Establish the setjmp return context for my_error_exit to use. */
- if (setjmp(jerr.setjmp_buffer))
+ if (setjmp(jerr.setjmp_buffer))
{
/* If we get here, the JPEG code has signaled an error.
* We need to clean up the JPEG object, close the input file, and return.
*/
- if (verbose)
+ if (verbose)
wxLogError(_("JPEG: Couldn't save image."));
jpeg_destroy_compress(&cinfo);
return FALSE;
cinfo.input_components = 3;
cinfo.in_color_space = JCS_RGB;
jpeg_set_defaults(&cinfo);
+
+ // TODO: 3rd parameter is force_baseline, what value should this be?
+ // Code says: "If force_baseline is TRUE, the computed quantization table entries
+ // are limited to 1..255 for JPEG baseline compatibility."
+ // 'Quality' is a number between 0 (terrible) and 100 (very good).
+ // The default (in jcparam.c, jpeg_set_defaults) is 75,
+ // and force_baseline is TRUE.
+ if (image->HasOption(wxT("quality")))
+ jpeg_set_quality(&cinfo, image->GetOptionInt(wxT("quality")), TRUE);
+
jpeg_start_compress(&cinfo, TRUE);
stride = cinfo.image_width * 3; /* JSAMPLEs per row in image_buffer */
return TRUE;
}
+#ifdef __VISUALC__
+ #pragma warning(default:4611)
+#endif /* VC++ */
bool wxJPEGHandler::DoCanRead( wxInputStream& stream )
{
unsigned char hdr[2];
- stream.Read(&hdr, 2);
+ stream.Read(hdr, 2);
stream.SeekI(-2, wxFromCurrent);
return (hdr[0] == 0xFF && hdr[1] == 0xD8);
}
projects / wxWidgets.git / blobdiff