Fix the URL generated by Doxygen @sampledir macro.

[wxWidgets.git] / src / common / imagjpeg.cpp

diff --git a/src/common/imagjpeg.cpp b/src/common/imagjpeg.cpp
index 829dc4c796ec09fdc455ce1e5f197b2ea6924554..88bcb4f313d4cdd54a4f2cfb8d1141ea8b003639 100644 (file)
--- a/src/common/imagjpeg.cpp
+++ b/src/common/imagjpeg.cpp
@@ -17,23 +17,25 @@
 #if wxUSE_IMAGE && wxUSE_LIBJPEG
 
 #include "wx/imagjpeg.h"
 #if wxUSE_IMAGE && wxUSE_LIBJPEG
 
 #include "wx/imagjpeg.h"

+#include "wx/versioninfo.h"

 
 #ifndef WX_PRECOMP
     #include "wx/log.h"
     #include "wx/app.h"
     #include "wx/intl.h"
 
 #ifndef WX_PRECOMP
     #include "wx/log.h"
     #include "wx/app.h"
     #include "wx/intl.h"

+    #include "wx/bitmap.h"
+    #include "wx/module.h"

 #endif
 
 #endif
 

-#include "wx/bitmap.h"
-
-// NB: Some compilers define boolean type in Windows headers
-//     (e.g. Watcom C++, but not Open Watcom).
-//     This causes a conflict with jmorecfg.h header from libjpeg, so we have
-//     to make sure libjpeg won't try to define boolean itself. This is done by
-//     defining HAVE_BOOLEAN.
-#if defined(__WXMSW__) && (defined(__MWERKS__) || defined(__DIGITALMARS__))
+// A hack based on one from tif_jpeg.c to overcome the problem on Windows
+// of rpcndr.h defining boolean with a different type to the jpeg headers.
+//
+// This hack is only necessary for an external jpeg library, the builtin one
+// usually used on Windows doesn't use the type boolean, so always works.
+//
+#ifdef wxHACK_BOOLEAN

     #define HAVE_BOOLEAN
     #define HAVE_BOOLEAN

-    #include "wx/msw/wrapwin.h"
+    #define boolean wxHACK_BOOLEAN

 #endif
 
 extern "C"
 #endif
 
 extern "C"


@@ -44,19 +46,18 @@ extern "C"
     #include "jpeglib.h"
 }
 
     #include "jpeglib.h"
 }
 

+#ifndef HAVE_WXJPEG_BOOLEAN
+typedef boolean wxjpeg_boolean;
+#endif
+

 #include "wx/filefn.h"
 #include "wx/wfstream.h"
 #include "wx/filefn.h"
 #include "wx/wfstream.h"

-#include "wx/module.h"

 
 // For memcpy
 #include <string.h>
 // For JPEG library error handling
 #include <setjmp.h>
 
 
 // For memcpy
 #include <string.h>
 // For JPEG library error handling
 #include <setjmp.h>
 

-#ifdef __SALFORDC__
-#undef FAR
-#endif
-

 // ----------------------------------------------------------------------------
 // types
 // ----------------------------------------------------------------------------
 // ----------------------------------------------------------------------------
 // types
 // ----------------------------------------------------------------------------


@@ -96,11 +97,14 @@ typedef struct {
 
 typedef wx_source_mgr * wx_src_ptr;
 
 
 typedef wx_source_mgr * wx_src_ptr;
 

+extern "C"
+{
+

 CPP_METHODDEF(void) wx_init_source ( j_decompress_ptr WXUNUSED(cinfo) )
 {
 }
 
 CPP_METHODDEF(void) wx_init_source ( j_decompress_ptr WXUNUSED(cinfo) )
 {
 }
 

-CPP_METHODDEF(boolean) wx_fill_input_buffer ( j_decompress_ptr cinfo )
+CPP_METHODDEF(wxjpeg_boolean) wx_fill_input_buffer ( j_decompress_ptr cinfo )

 {
     wx_src_ptr src = (wx_src_ptr) cinfo->src;
 
 {
     wx_src_ptr src = (wx_src_ptr) cinfo->src;
 


@@ -145,14 +149,11 @@ CPP_METHODDEF(void) wx_term_source ( j_decompress_ptr cinfo )
 
 // JPEG error manager:
 
 
 // JPEG error manager:
 

-struct wx_error_mgr {
-  struct jpeg_error_mgr pub;    /* "public" fields */
-
+struct wx_error_mgr : public jpeg_error_mgr
+{

   jmp_buf setjmp_buffer;    /* for return to caller */
 };
 
   jmp_buf setjmp_buffer;    /* for return to caller */
 };
 

-typedef struct wx_error_mgr * wx_error_ptr;
-

 /*
  * Here's the routine that will replace the standard error_exit method:
  */
 /*
  * Here's the routine that will replace the standard error_exit method:
  */


@@ -160,14 +161,14 @@ typedef struct wx_error_mgr * wx_error_ptr;
 CPP_METHODDEF(void) wx_error_exit (j_common_ptr cinfo)
 {
   /* cinfo->err really points to a wx_error_mgr struct, so coerce pointer */
 CPP_METHODDEF(void) wx_error_exit (j_common_ptr cinfo)
 {
   /* cinfo->err really points to a wx_error_mgr struct, so coerce pointer */

-  wx_error_ptr myerr = (wx_error_ptr) cinfo->err;
+  wx_error_mgr * const jerr = (wx_error_mgr *) cinfo->err;

 
   /* Always display the message. */
   /* We could postpone this until after returning, if we chose. */
   (*cinfo->err->output_message) (cinfo);
 
   /* Return control to the setjmp point */
 
   /* Always display the message. */
   /* We could postpone this until after returning, if we chose. */
   (*cinfo->err->output_message) (cinfo);
 
   /* Return control to the setjmp point */

-  longjmp(myerr->setjmp_buffer, 1);
+  longjmp(jerr->setjmp_buffer, 1);

 }
 
 /*
 }
 
 /*


@@ -202,6 +203,23 @@ void wx_jpeg_io_src( j_decompress_ptr cinfo, wxInputStream& infile )
     src->pub.term_source = wx_term_source;
 }
 
     src->pub.term_source = wx_term_source;
 }
 

+} // extern "C"
+
+static inline void wx_cmyk_to_rgb(unsigned char* rgb, const unsigned char* cmyk)
+{
+    register int k = 255 - cmyk[3];
+    register int k2 = cmyk[3];
+    register int c;
+
+    c = k + k2 * (255 - cmyk[0]) / 255;
+    rgb[0] = (unsigned char)((c > 255) ? 0 : (255 - c));
+
+    c = k + k2 * (255 - cmyk[1]) / 255;
+    rgb[1] = (unsigned char)((c > 255) ? 0 : (255 - c));
+
+    c = k + k2 * (255 - cmyk[2]) / 255;
+    rgb[2] = (unsigned char)((c > 255) ? 0 : (255 - c));
+}

 
 // temporarily disable the warning C4611 (interaction between '_setjmp' and
 // C++ object destruction is non-portable) - I don't see any dtors here
 
 // temporarily disable the warning C4611 (interaction between '_setjmp' and
 // C++ object destruction is non-portable) - I don't see any dtors here


@@ -211,15 +229,19 @@ void wx_jpeg_io_src( j_decompress_ptr cinfo, wxInputStream& infile )
 
 bool wxJPEGHandler::LoadFile( wxImage *image, wxInputStream& stream, bool verbose, int WXUNUSED(index) )
 {
 
 bool wxJPEGHandler::LoadFile( wxImage *image, wxInputStream& stream, bool verbose, int WXUNUSED(index) )
 {

+    wxCHECK_MSG( image, false, "NULL image pointer" );
+

     struct jpeg_decompress_struct cinfo;
     struct jpeg_decompress_struct cinfo;

-    struct wx_error_mgr jerr;
-    JSAMPARRAY tempbuf;
+    wx_error_mgr jerr;

     unsigned char *ptr;
     unsigned char *ptr;

-    unsigned stride;

 
 

+    // save this before calling Destroy()
+    const unsigned maxWidth = image->GetOptionInt(wxIMAGE_OPTION_MAX_WIDTH),
+                   maxHeight = image->GetOptionInt(wxIMAGE_OPTION_MAX_HEIGHT);

     image->Destroy();
     image->Destroy();

-    cinfo.err = jpeg_std_error( &jerr.pub );
-    jerr.pub.error_exit = wx_error_exit;
+
+    cinfo.err = jpeg_std_error( &jerr );
+    jerr.error_exit = wx_error_exit;

 
     if (!verbose)
         cinfo.err->output_message = wx_ignore_message;
 
     if (!verbose)
         cinfo.err->output_message = wx_ignore_message;


@@ -230,36 +252,95 @@ bool wxJPEGHandler::LoadFile( wxImage *image, wxInputStream& stream, bool verbos
        * We need to clean up the JPEG object, close the input file, and return.
        */
       if (verbose)
        * We need to clean up the JPEG object, close the input file, and return.
        */
       if (verbose)

+      {

         wxLogError(_("JPEG: Couldn't load - file is probably corrupted."));
         wxLogError(_("JPEG: Couldn't load - file is probably corrupted."));

+      }

       (cinfo.src->term_source)(&cinfo);
       jpeg_destroy_decompress(&cinfo);
       (cinfo.src->term_source)(&cinfo);
       jpeg_destroy_decompress(&cinfo);

-      if (image->Ok()) image->Destroy();
+      if (image->IsOk()) image->Destroy();

       return false;
     }
 
     jpeg_create_decompress( &cinfo );
     wx_jpeg_io_src( &cinfo, stream );
     jpeg_read_header( &cinfo, TRUE );
       return false;
     }
 
     jpeg_create_decompress( &cinfo );
     wx_jpeg_io_src( &cinfo, stream );
     jpeg_read_header( &cinfo, TRUE );

-    cinfo.out_color_space = JCS_RGB;
+
+    int bytesPerPixel;
+    if ((cinfo.out_color_space == JCS_CMYK) || (cinfo.out_color_space == JCS_YCCK))
+    {
+        cinfo.out_color_space = JCS_CMYK;
+        bytesPerPixel = 4;
+    }
+    else // all the rest is treated as RGB
+    {
+        cinfo.out_color_space = JCS_RGB;
+        bytesPerPixel = 3;
+    }
+
+    // scale the picture to fit in the specified max size if necessary
+    if ( maxWidth > 0 || maxHeight > 0 )
+    {
+        unsigned& scale = cinfo.scale_denom;
+        while ( (maxWidth && (cinfo.image_width / scale > maxWidth)) ||
+                    (maxHeight && (cinfo.image_height / scale > maxHeight)) )
+        {
+            scale *= 2;
+        }
+    }
+

     jpeg_start_decompress( &cinfo );
 
     jpeg_start_decompress( &cinfo );
 

-    image->Create( cinfo.image_width, cinfo.image_height );
-    if (!image->Ok()) {
+    image->Create( cinfo.output_width, cinfo.output_height );
+    if (!image->IsOk()) {

         jpeg_finish_decompress( &cinfo );
         jpeg_destroy_decompress( &cinfo );
         return false;
     }
     image->SetMask( false );
     ptr = image->GetData();
         jpeg_finish_decompress( &cinfo );
         jpeg_destroy_decompress( &cinfo );
         return false;
     }
     image->SetMask( false );
     ptr = image->GetData();

-    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 ) {
+    unsigned stride = cinfo.output_width * bytesPerPixel;
+    JSAMPARRAY 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 );
         jpeg_read_scanlines( &cinfo, tempbuf, 1 );

-        memcpy( ptr, tempbuf[0], stride );
-        ptr += stride;
+        if (cinfo.out_color_space == JCS_RGB)
+        {
+            memcpy( ptr, tempbuf[0], stride );
+            ptr += stride;
+        }
+        else // CMYK
+        {
+            const unsigned char* inptr = (const unsigned char*) tempbuf[0];
+            for (size_t i = 0; i < cinfo.output_width; i++)
+            {
+                wx_cmyk_to_rgb(ptr, inptr);
+                ptr += 3;
+                inptr += 4;
+            }
+        }
+    }
+
+    // set up resolution if available: it's part of optional JFIF APP0 chunk
+    if ( cinfo.saw_JFIF_marker )
+    {
+        image->SetOption(wxIMAGE_OPTION_RESOLUTIONX, cinfo.X_density);
+        image->SetOption(wxIMAGE_OPTION_RESOLUTIONY, cinfo.Y_density);
+
+        // we use the same values for this option as libjpeg so we don't need
+        // any conversion here
+        image->SetOption(wxIMAGE_OPTION_RESOLUTIONUNIT, cinfo.density_unit);
+    }
+
+    if ( cinfo.image_width != cinfo.output_width || cinfo.image_height != cinfo.output_height )
+    {
+        // save the original image size
+        image->SetOption(wxIMAGE_OPTION_ORIGINAL_WIDTH, cinfo.image_width);
+        image->SetOption(wxIMAGE_OPTION_ORIGINAL_HEIGHT, cinfo.image_height);

     }
     }

+

     jpeg_finish_decompress( &cinfo );
     jpeg_destroy_decompress( &cinfo );
     return true;
     jpeg_finish_decompress( &cinfo );
     jpeg_destroy_decompress( &cinfo );
     return true;


@@ -276,6 +357,9 @@ typedef wx_destination_mgr * wx_dest_ptr;
 
 #define OUTPUT_BUF_SIZE  4096    /* choose an efficiently fwrite'able size */
 
 
 #define OUTPUT_BUF_SIZE  4096    /* choose an efficiently fwrite'able size */
 

+extern "C"
+{
+

 CPP_METHODDEF(void) wx_init_destination (j_compress_ptr cinfo)
 {
     wx_dest_ptr dest = (wx_dest_ptr) cinfo->dest;
 CPP_METHODDEF(void) wx_init_destination (j_compress_ptr cinfo)
 {
     wx_dest_ptr dest = (wx_dest_ptr) cinfo->dest;


@@ -288,7 +372,7 @@ CPP_METHODDEF(void) wx_init_destination (j_compress_ptr cinfo)
     dest->pub.free_in_buffer = OUTPUT_BUF_SIZE;
 }
 
     dest->pub.free_in_buffer = OUTPUT_BUF_SIZE;
 }
 

-CPP_METHODDEF(boolean) wx_empty_output_buffer (j_compress_ptr cinfo)
+CPP_METHODDEF(wxjpeg_boolean) wx_empty_output_buffer (j_compress_ptr cinfo)

 {
     wx_dest_ptr dest = (wx_dest_ptr) cinfo->dest;
 
 {
     wx_dest_ptr dest = (wx_dest_ptr) cinfo->dest;
 


@@ -324,16 +408,18 @@ GLOBAL(void) wx_jpeg_io_dest (j_compress_ptr cinfo, wxOutputStream& outfile)
     dest->stream = &outfile;
 }
 
     dest->stream = &outfile;
 }
 

+} // extern "C"
+

 bool wxJPEGHandler::SaveFile( wxImage *image, wxOutputStream& stream, bool verbose )
 {
     struct jpeg_compress_struct cinfo;
 bool wxJPEGHandler::SaveFile( wxImage *image, wxOutputStream& stream, bool verbose )
 {
     struct jpeg_compress_struct cinfo;

-    struct wx_error_mgr jerr;
+    wx_error_mgr jerr;

     JSAMPROW row_pointer[1];    /* pointer to JSAMPLE row[s] */
     JSAMPLE *image_buffer;
     int stride;                /* physical row width in image buffer */
 
     JSAMPROW row_pointer[1];    /* pointer to JSAMPLE row[s] */
     JSAMPLE *image_buffer;
     int stride;                /* physical row width in image buffer */
 

-    cinfo.err = jpeg_std_error(&jerr.pub);
-    jerr.pub.error_exit = wx_error_exit;
+    cinfo.err = jpeg_std_error(&jerr);
+    jerr.error_exit = wx_error_exit;

 
     if (!verbose)
         cinfo.err->output_message = wx_ignore_message;
 
     if (!verbose)
         cinfo.err->output_message = wx_ignore_message;


@@ -345,7 +431,9 @@ bool wxJPEGHandler::SaveFile( wxImage *image, wxOutputStream& stream, bool verbo
          * We need to clean up the JPEG object, close the input file, and return.
          */
          if (verbose)
          * We need to clean up the JPEG object, close the input file, and return.
          */
          if (verbose)

+         {

             wxLogError(_("JPEG: Couldn't save image."));
             wxLogError(_("JPEG: Couldn't save image."));

+         }

          jpeg_destroy_compress(&cinfo);
          return false;
     }
          jpeg_destroy_compress(&cinfo);
          return false;
     }


@@ -369,37 +457,16 @@ bool wxJPEGHandler::SaveFile( wxImage *image, wxOutputStream& stream, bool verbo
         jpeg_set_quality(&cinfo, image->GetOptionInt(wxIMAGE_OPTION_QUALITY), TRUE);
 
     // set the resolution fields in the output file
         jpeg_set_quality(&cinfo, image->GetOptionInt(wxIMAGE_OPTION_QUALITY), TRUE);
 
     // set the resolution fields in the output file

-    UINT16 resX,
-           resY;
-    if ( image->HasOption(wxIMAGE_OPTION_RESOLUTIONX) &&
-         image->HasOption(wxIMAGE_OPTION_RESOLUTIONY) )
-    {
-        resX = (UINT16)image->GetOptionInt(wxIMAGE_OPTION_RESOLUTIONX);
-        resY = (UINT16)image->GetOptionInt(wxIMAGE_OPTION_RESOLUTIONY);
-    }
-    else if ( image->HasOption(wxIMAGE_OPTION_RESOLUTION) )
-    {
-        resX =
-        resY = (UINT16)image->GetOptionInt(wxIMAGE_OPTION_RESOLUTION);
-    }
-    else
-    {
-        resX =
-        resY = 0;
-    }
-
-    if ( resX && resY )
+    int resX, resY;
+    wxImageResolution res = GetResolutionFromOptions(*image, &resX, &resY);
+    if ( res != wxIMAGE_RESOLUTION_NONE )

     {
         cinfo.X_density = resX;
         cinfo.Y_density = resY;
     {
         cinfo.X_density = resX;
         cinfo.Y_density = resY;

-    }

 
 

-    // sets the resolution unit field in the output file
-    // wxIMAGE_RESOLUTION_INCHES for inches
-    // wxIMAGE_RESOLUTION_CM for centimeters
-    if ( image->HasOption(wxIMAGE_OPTION_RESOLUTIONUNIT) )
-    {
-        cinfo.density_unit = (UINT8)image->GetOptionInt(wxIMAGE_OPTION_RESOLUTIONUNIT);
+        // it so happens that wxIMAGE_RESOLUTION_INCHES/CM values are the same
+        // ones as used by libjpeg, so we can assign them directly
+        cinfo.density_unit = res;

     }
 
     jpeg_start_compress(&cinfo, TRUE);
     }
 
     jpeg_start_compress(&cinfo, TRUE);


@@ -424,7 +491,7 @@ bool wxJPEGHandler::DoCanRead( wxInputStream& stream )
 {
     unsigned char hdr[2];
 
 {
     unsigned char hdr[2];
 

-    if ( !stream.Read(hdr, WXSIZEOF(hdr)) )
+    if ( !stream.Read(hdr, WXSIZEOF(hdr)) )     // it's ok to modify the stream position here

         return false;
 
     return hdr[0] == 0xFF && hdr[1] == 0xD8;
         return false;
 
     return hdr[0] == 0xFF && hdr[1] == 0xD8;


@@ -432,4 +499,9 @@ bool wxJPEGHandler::DoCanRead( wxInputStream& stream )
 
 #endif   // wxUSE_STREAMS
 
 
 #endif   // wxUSE_STREAMS
 

+/*static*/ wxVersionInfo wxJPEGHandler::GetLibraryVersionInfo()
+{
+    return wxVersionInfo("libjpeg", JPEG_LIB_VERSION/10, JPEG_LIB_VERSION%10);
+}
+

 #endif   // wxUSE_LIBJPEG
 #endif   // wxUSE_LIBJPEG