#include "wx/debug.h"
#include "wx/log.h"
#include "wx/app.h"
-extern "C" {
-#include "jpeglib.h"
+extern "C"
+{
+ #include "jpeglib.h"
}
#include "wx/filefn.h"
#include "wx/wfstream.h"
typedef struct {
struct jpeg_source_mgr pub; /* public fields */
-
+
JOCTET* buffer; /* start of buffer */
} my_source_mgr;
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;
}
METHODDEF(void) my_term_source ( j_decompress_ptr cinfo )
{
my_src_ptr src = (my_src_ptr) cinfo->src;
-
+
free (src->buffer);
}
void jpeg_wxio_src( j_decompress_ptr cinfo, wxInputStream& infile )
{
my_src_ptr src;
-
- if (cinfo->src == NULL) { /* first time for this JPEG object? */
+
+ if (cinfo->src == NULL) { /* first time for this JPEG object? */
cinfo->src = (struct jpeg_source_mgr *)
(*cinfo->mem->alloc_small) ((j_common_ptr) cinfo, JPOOL_PERMANENT,
sizeof(my_source_mgr));
src->buffer = (JOCTET *) malloc (infile.GetSize());
src->pub.next_input_byte = src->buffer; /* until buffer loaded */
infile.Read(src->buffer, infile.GetSize());
-
+
src->pub.init_source = my_init_source;
src->pub.fill_input_buffer = my_fill_input_buffer;
src->pub.skip_input_data = my_skip_input_data;
// JPEG error manager:
struct my_error_mgr {
- struct jpeg_error_mgr pub; /* "public" fields */
+ struct jpeg_error_mgr pub; /* "public" fields */
- jmp_buf setjmp_buffer; /* for return to caller */
+ jmp_buf setjmp_buffer; /* for return to caller */
};
typedef struct my_error_mgr * my_error_ptr;
-bool wxJPEGHandler::LoadFile( wxImage *image, wxInputStream& stream, bool verbose )
+bool wxJPEGHandler::LoadFile( wxImage *image, wxInputStream& stream, bool verbose, int WXUNUSED(index) )
{
struct jpeg_decompress_struct cinfo;
struct my_error_mgr jerr;
JSAMPARRAY tempbuf;
unsigned char *ptr;
unsigned stride;
-
+
image->Destroy();
cinfo.err = jpeg_std_error( &jerr.pub );
jerr.pub.error_exit = my_error_exit;
jpeg_read_header( &cinfo, TRUE );
cinfo.out_color_space = JCS_RGB;
jpeg_start_decompress( &cinfo );
-
+
image->Create( cinfo.image_width, cinfo.image_height );
if (!image->Ok()) {
jpeg_finish_decompress( &cinfo );
stride = cinfo.output_width * 3;
tempbuf = (*cinfo.mem->alloc_sarray)
((j_common_ptr) &cinfo, JPOOL_IMAGE, stride, 1 );
-
+
while ( cinfo.output_scanline < cinfo.output_height ) {
jpeg_read_scanlines( &cinfo, tempbuf, 1 );
memcpy( ptr, tempbuf[0], stride );
typedef struct {
struct jpeg_destination_mgr pub;
-
+
wxOutputStream *stream;
JOCTET * buffer;
} my_destination_mgr;
typedef my_destination_mgr * my_dest_ptr;
-#define OUTPUT_BUF_SIZE 4096 /* choose an efficiently fwrite'able size */
+#define OUTPUT_BUF_SIZE 4096 /* choose an efficiently fwrite'able size */
METHODDEF(void) init_destination (j_compress_ptr cinfo)
{
my_dest_ptr dest = (my_dest_ptr) cinfo->dest;
-
+
/* Allocate the output buffer --- it will be released when done with image */
dest->buffer = (JOCTET *)
(*cinfo->mem->alloc_small) ((j_common_ptr) cinfo, JPOOL_IMAGE,
METHODDEF(boolean) empty_output_buffer (j_compress_ptr cinfo)
{
my_dest_ptr dest = (my_dest_ptr) cinfo->dest;
-
+
dest->stream->Write(dest->buffer, OUTPUT_BUF_SIZE);
dest->pub.next_output_byte = dest->buffer;
dest->pub.free_in_buffer = OUTPUT_BUF_SIZE;
GLOBAL(void) jpeg_wxio_dest (j_compress_ptr cinfo, wxOutputStream& outfile)
{
my_dest_ptr dest;
-
- if (cinfo->dest == NULL) { /* first time for this JPEG object? */
+
+ if (cinfo->dest == NULL) { /* first time for this JPEG object? */
cinfo->dest = (struct jpeg_destination_mgr *)
(*cinfo->mem->alloc_small) ((j_common_ptr) cinfo, JPOOL_PERMANENT,
sizeof(my_destination_mgr));
}
-
+
dest = (my_dest_ptr) cinfo->dest;
dest->pub.init_destination = init_destination;
dest->pub.empty_output_buffer = empty_output_buffer;
{
struct jpeg_compress_struct cinfo;
struct my_error_mgr jerr;
- JSAMPROW row_pointer[1]; /* pointer to JSAMPLE row[s] */
+ JSAMPROW row_pointer[1]; /* pointer to JSAMPLE row[s] */
JSAMPLE *image_buffer;
- int stride; /* physical row width in image buffer */
-
+ int stride; /* physical row width in image buffer */
+
cinfo.err = jpeg_std_error(&jerr.pub);
jerr.pub.error_exit = my_error_exit;
jpeg_create_compress(&cinfo);
jpeg_wxio_dest(&cinfo, stream);
-
+
cinfo.image_width = image->GetWidth();
cinfo.image_height = image->GetHeight();
cinfo.input_components = 3;
cinfo.in_color_space = JCS_RGB;
jpeg_set_defaults(&cinfo);
jpeg_start_compress(&cinfo, TRUE);
-
- stride = cinfo.image_width * 3; /* JSAMPLEs per row in image_buffer */
+
+ stride = cinfo.image_width * 3; /* JSAMPLEs per row in image_buffer */
image_buffer = image->GetData();
while (cinfo.next_scanline < cinfo.image_height) {
row_pointer[0] = &image_buffer[cinfo.next_scanline * stride];
}
jpeg_finish_compress(&cinfo);
jpeg_destroy_compress(&cinfo);
-
+
return TRUE;
}
-#endif
- // wxUSE_STREAMS
-#endif
- // wxUSE_LIBJPEG
+bool wxJPEGHandler::DoCanRead( wxInputStream& stream )
+{
+ unsigned char hdr[2];
+
+ stream.Read(&hdr, 2);
+ stream.SeekI(-2, wxFromCurrent);
+ return (hdr[0] == 0xFF && hdr[1] == 0xD8);
+}
+
+#endif // wxUSE_STREAMS
+
+#endif // wxUSE_LIBJPEG
projects / wxWidgets.git / blobdiff