Removed TABs that had gotten in to the source

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

diff --git a/src/common/imagpng.cpp b/src/common/imagpng.cpp
index 1b3a06663955197325bcd50795226113c0b2018f..cbbc10b261a4942099c16711aac48cefc8b98d85 100644 (file)
--- a/src/common/imagpng.cpp
+++ b/src/common/imagpng.cpp
@@ -7,10 +7,9 @@
 // Licence:     wxWindows licence
 /////////////////////////////////////////////////////////////////////////////
 
 // 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 "imagpng.h"
+#endif

 
 // For compilers that support precompilation, includes "wx.h".
 #include "wx/wxprec.h"
 
 // For compilers that support precompilation, includes "wx.h".
 #include "wx/wxprec.h"


@@ -23,9 +22,9 @@
   #include "wx/defs.h"
 #endif
 
   #include "wx/defs.h"
 #endif
 

-#if wxUSE_LIBPNG
+#if wxUSE_IMAGE && wxUSE_LIBPNG

 
 

-#include "wx/image.h"
+#include "wx/imagpng.h"

 #include "wx/bitmap.h"
 #include "wx/debug.h"
 #include "wx/log.h"
 #include "wx/bitmap.h"
 #include "wx/debug.h"
 #include "wx/log.h"


@@ -53,29 +52,56 @@
 // wxPNGHandler
 //-----------------------------------------------------------------------------
 
 // wxPNGHandler
 //-----------------------------------------------------------------------------
 

-#if !USE_SHARED_LIBRARIES

 IMPLEMENT_DYNAMIC_CLASS(wxPNGHandler,wxImageHandler)
 IMPLEMENT_DYNAMIC_CLASS(wxPNGHandler,wxImageHandler)

-#endif

 
 

-#if wxUSE_STREAMS
+#if wxUSE_LIBPNG

 
 #if defined(__VISAGECPP__)
 
 #if defined(__VISAGECPP__)

-#define LINKAGEMODE _Optlink
+#define PNGLINKAGEMODE _Optlink
+#elif defined(__WATCOMC__)
+#define PNGLINKAGEMODE _cdecl

 #else
 #else

-#define LINKAGEMODE
+#define PNGLINKAGEMODE

 #endif
 
 #endif
 

-static void LINKAGEMODE _PNG_stream_reader( png_structp png_ptr, png_bytep data, png_size_t length )
+static void PNGLINKAGEMODE _PNG_stream_reader( png_structp png_ptr, png_bytep data, png_size_t length )

 {
     ((wxInputStream*) png_get_io_ptr( png_ptr )) -> Read(data, length);
 }
 
 {
     ((wxInputStream*) png_get_io_ptr( png_ptr )) -> Read(data, length);
 }
 

-static void LINKAGEMODE _PNG_stream_writer( png_structp png_ptr, png_bytep data, png_size_t length )
+static void PNGLINKAGEMODE _PNG_stream_writer( png_structp png_ptr, png_bytep data, png_size_t length )

 {
     ((wxOutputStream*) png_get_io_ptr( png_ptr )) -> Write(data, length);
 }
 
 {
     ((wxOutputStream*) png_get_io_ptr( png_ptr )) -> Write(data, length);
 }
 

-bool wxPNGHandler::LoadFile( wxImage *image, wxInputStream& stream )
+// from pngerror.c
+// so that the libpng doesn't send anything on stderr
+void
+PNGLINKAGEMODE png_silent_error(png_structp png_ptr, png_const_charp WXUNUSED(message))
+{
+#ifdef USE_FAR_KEYWORD
+   {
+      jmp_buf jmpbuf;
+      png_memcpy(jmpbuf,png_ptr->jmpbuf,sizeof(jmp_buf));
+      longjmp(jmpbuf, 1);
+   }
+#else
+   longjmp(png_ptr->jmpbuf, 1);
+#endif
+}
+
+void
+PNGLINKAGEMODE png_silent_warning(png_structp WXUNUSED(png_ptr), png_const_charp WXUNUSED(message))
+{
+}
+
+// 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 wxPNGHandler::LoadFile( wxImage *image, wxInputStream& stream, bool verbose, int WXUNUSED(index) )

 {
     // VZ: as this function uses setjmp() the only fool proof error handling
     //     method is to use goto (setjmp is not really C++ dtors friendly...)
 {
     // VZ: as this function uses setjmp() the only fool proof error handling
     //     method is to use goto (setjmp is not really C++ dtors friendly...)


@@ -93,6 +119,9 @@ bool wxPNGHandler::LoadFile( wxImage *image, wxInputStream& stream )
     if (!png_ptr)
         goto error_nolines;
 
     if (!png_ptr)
         goto error_nolines;
 

+    // the file example.c explain how to guess if the stream is a png image
+    if (!verbose) png_set_error_fn(png_ptr, (png_voidp)NULL, png_silent_error, png_silent_warning);
+

     info_ptr = png_create_info_struct( png_ptr );
     if (!info_ptr)
         goto error_nolines;
     info_ptr = png_create_info_struct( png_ptr );
     if (!info_ptr)
         goto error_nolines;


@@ -120,18 +149,18 @@ bool wxPNGHandler::LoadFile( wxImage *image, wxInputStream& stream )
         png_set_expand( png_ptr );
     png_set_filler( png_ptr, 0xff, PNG_FILLER_AFTER );
 
         png_set_expand( png_ptr );
     png_set_filler( png_ptr, 0xff, PNG_FILLER_AFTER );
 

-    image->Create( width, height );
+    image->Create( (int)width, (int)height );

 
     if (!image->Ok())
         goto error_nolines;
 
 
     if (!image->Ok())
         goto error_nolines;
 

-    lines = (unsigned char **)malloc( height * sizeof(unsigned char *) );
+    lines = (unsigned char **)malloc( (size_t)(height * sizeof(unsigned char *)) );

     if (lines == NULL)
         goto error_nolines;
 
     for (i = 0; i < height; i++)
     {
     if (lines == NULL)
         goto error_nolines;
 
     for (i = 0; i < height; i++)
     {

-        if ((lines[i] = (unsigned char *)malloc(width * (sizeof(unsigned char) * 4))) == NULL)
+        if ((lines[i] = (unsigned char *)malloc( (size_t)(width * (sizeof(unsigned char) * 4)))) == NULL)

         {
             for ( unsigned int n = 0; n < i; n++ )
                 free( lines[n] );
         {
             for ( unsigned int n = 0; n < i; n++ )
                 free( lines[n] );


@@ -143,6 +172,7 @@ bool wxPNGHandler::LoadFile( wxImage *image, wxInputStream& stream )
     {
         int transp = 0;
         png_read_image( png_ptr, lines );
     {
         int transp = 0;
         png_read_image( png_ptr, lines );

+        png_read_end( png_ptr, info_ptr );

         png_destroy_read_struct( &png_ptr, &info_ptr, (png_infopp) NULL );
         unsigned char *ptr = image->GetData();
         if ((color_type == PNG_COLOR_TYPE_GRAY) ||
         png_destroy_read_struct( &png_ptr, &info_ptr, (png_infopp) NULL );
         unsigned char *ptr = image->GetData();
         if ((color_type == PNG_COLOR_TYPE_GRAY) ||


@@ -219,7 +249,8 @@ bool wxPNGHandler::LoadFile( wxImage *image, wxInputStream& stream )
  error_nolines:
     lines = NULL; // called from before it was set
  error:
  error_nolines:
     lines = NULL; // called from before it was set
  error:

-    wxLogError(_("Couldn't load a PNG image - probably file is corrupted."));
+    if (verbose)
+       wxLogError(_("Couldn't load a PNG image - file is corrupted or not enough memory."));

 
     if ( image->Ok() )
     {
 
     if ( image->Ok() )
     {


@@ -244,8 +275,7 @@ bool wxPNGHandler::LoadFile( wxImage *image, wxInputStream& stream )
     return FALSE;
 }
 
     return FALSE;
 }
 

-
-bool wxPNGHandler::SaveFile( wxImage *image, wxOutputStream& stream )
+bool wxPNGHandler::SaveFile( wxImage *image, wxOutputStream& stream, bool verbose )

 {
     {
         png_structp png_ptr = png_create_write_struct( PNG_LIBPNG_VER_STRING, NULL, NULL, NULL);
 {
     {
         png_structp png_ptr = png_create_write_struct( PNG_LIBPNG_VER_STRING, NULL, NULL, NULL);


@@ -254,6 +284,8 @@ bool wxPNGHandler::SaveFile( wxImage *image, wxOutputStream& stream )
             return FALSE;
         }
 
             return FALSE;
         }
 

+        if (!verbose) png_set_error_fn(png_ptr, (png_voidp)NULL, png_silent_error, png_silent_warning);
+

         png_infop info_ptr = png_create_info_struct(png_ptr);
         if (info_ptr == NULL)
         {
         png_infop info_ptr = png_create_info_struct(png_ptr);
         if (info_ptr == NULL)
         {


@@ -298,15 +330,16 @@ bool wxPNGHandler::SaveFile( wxImage *image, wxOutputStream& stream )
                 data[(x << 2) + 0] = *ptr++;
                 data[(x << 2) + 1] = *ptr++;
                 data[(x << 2) + 2] = *ptr++;
                 data[(x << 2) + 0] = *ptr++;
                 data[(x << 2) + 1] = *ptr++;
                 data[(x << 2) + 2] = *ptr++;

-                if ((data[(x << 2) + 0] == image->GetMaskRed()) &&
-                    (data[(x << 2) + 1] == image->GetMaskGreen()) &&
-                    (data[(x << 2) + 2] == image->GetMaskBlue()))
+                if (( !image->HasMask() ) || \
+                    (data[(x << 2) + 0] != image->GetMaskRed()) || \
+                    (data[(x << 2) + 1] != image->GetMaskGreen()) || \
+                    (data[(x << 2) + 2] != image->GetMaskBlue()))

                 {
                 {

-                    data[(x << 2) + 3] = 0;
+                    data[(x << 2) + 3] = 255;

                 }
                 else
                 {
                 }
                 else
                 {

-                    data[(x << 2) + 3] = 255;
+                    data[(x << 2) + 3] = 0;

                 }
             }
             png_bytep row_ptr = data;
                 }
             }
             png_bytep row_ptr = data;


@@ -320,9 +353,19 @@ bool wxPNGHandler::SaveFile( wxImage *image, wxOutputStream& stream )
     return TRUE;
 }
 
     return TRUE;
 }
 

-#endif
-  // wxUSE_STREAMS
+#ifdef __VISUALC__
+    #pragma warning(default:4611)
+#endif /* VC++ */

 
 

-#endif
-  // wxUSE_LIBPNG
+bool wxPNGHandler::DoCanRead( wxInputStream& stream )
+{
+    unsigned char hdr[4];
+
+    stream.Read(hdr, 4);
+    stream.SeekI(-4, wxFromCurrent);
+    return (hdr[0] == 0x89 && hdr[1] == 'P' && hdr[2] == 'N' && hdr[3] == 'G');
+}
+
+#endif  // wxUSE_STREAMS

 
 

+#endif  // wxUSE_LIBPNG