X-Git-Url: https://git.saurik.com/wxWidgets.git/blobdiff_plain/982a6623f7de0d5eb82c18349f16c66cf2a55018..bad6c5e264fe9a7ac9e931d071d72acdabb3401e:/src/common/imagpng.cpp

diff --git a/src/common/imagpng.cpp b/src/common/imagpng.cpp
index d4c1cdb59f..83446867ad 100644
--- a/src/common/imagpng.cpp
+++ b/src/common/imagpng.cpp
@@ -1,5 +1,5 @@
 /////////////////////////////////////////////////////////////////////////////
-// Name:        src/common/imagepng.cpp
+// Name:        src/common/imagpng.cpp
 // Purpose:     wxImage PNG handler
 // Author:      Robert Roebling
 // RCS-ID:      $Id$
@@ -28,26 +28,16 @@
 
 #ifndef WX_PRECOMP
     #include "wx/log.h"
-    #include "wx/app.h"
-    #include "wx/bitmap.h"
-    #include "wx/module.h"
+    #include "wx/intl.h"
+    #include "wx/palette.h"
+    #include "wx/stream.h"
 #endif
 
 #include "png.h"
-#include "wx/filefn.h"
-#include "wx/wfstream.h"
-#include "wx/intl.h"
-#include "wx/palette.h"
 
 // For memcpy
 #include <string.h>
 
-#ifdef __SALFORDC__
-#ifdef FAR
-#undef FAR
-#endif
-#endif
-
 // ----------------------------------------------------------------------------
 // constants
 // ----------------------------------------------------------------------------
@@ -105,7 +95,9 @@ IMPLEMENT_DYNAMIC_CLASS(wxPNGHandler,wxImageHandler)
 #if wxUSE_STREAMS
 
 #ifndef PNGLINKAGEMODE
-    #if defined(__WATCOMC__) && ( defined(__WXMSW__) || defined(__WXMGL__) )
+    #ifdef PNGAPI
+        #define PNGLINKAGEMODE PNGAPI
+    #elif defined(__WATCOMC__)
         // we need an explicit cdecl for Watcom, at least according to
         //
         // http://sf.net/tracker/index.php?func=detail&aid=651492&group_id=9863&atid=109863
@@ -156,19 +148,19 @@ struct wxPNGInfoStruct
 extern "C"
 {
 
-void PNGLINKAGEMODE wx_PNG_stream_reader( png_structp png_ptr, png_bytep data,
-                                          png_size_t length )
+static void PNGLINKAGEMODE wx_PNG_stream_reader( png_structp png_ptr, png_bytep data,
+                                                 png_size_t length )
 {
     WX_PNG_INFO(png_ptr)->stream.in->Read(data, length);
 }
 
-void PNGLINKAGEMODE wx_PNG_stream_writer( png_structp png_ptr, png_bytep data,
-                                          png_size_t length )
+static void PNGLINKAGEMODE wx_PNG_stream_writer( png_structp png_ptr, png_bytep data,
+                                                 png_size_t length )
 {
     WX_PNG_INFO(png_ptr)->stream.out->Write(data, length);
 }
 
-void
+static void
 PNGLINKAGEMODE wx_png_warning(png_structp png_ptr, png_const_charp message)
 {
     wxPNGInfoStruct *info = png_ptr ? WX_PNG_INFO(png_ptr) : NULL;
@@ -178,7 +170,7 @@ PNGLINKAGEMODE wx_png_warning(png_structp png_ptr, png_const_charp message)
 
 // from pngerror.c
 // so that the libpng doesn't send anything on stderr
-void
+static void
 PNGLINKAGEMODE wx_png_error(png_structp png_ptr, png_const_charp message)
 {
     wx_png_warning(NULL, message);
@@ -279,6 +271,7 @@ FindMaskColour(unsigned char **lines, png_uint_32 width, png_uint_32 height,
             r2 = *p++;
             g2 = *p++;
             b2 = *p++;
+            ++p; // jump over alpha
 
             wxImageHistogramEntry&
                 entry = h[wxImageHistogram:: MakeKey(r2, g2, b2)];
@@ -309,7 +302,7 @@ bool wxPNGHandler::DoCanRead( wxInputStream& stream )
 {
     unsigned char hdr[4];
 
-    if ( !stream.Read(hdr, WXSIZEOF(hdr)) )
+    if ( !stream.Read(hdr, WXSIZEOF(hdr)) )     // it's ok to modify the stream position here
         return false;
 
     return memcmp(hdr, "\211PNG", WXSIZEOF(hdr)) == 0;
@@ -384,8 +377,8 @@ void CopyDataFromPNG(wxImage *image,
                         if ( IsTransparent(a) )
                         {
                             *ptrDst++ = rMask;
-                            *ptrDst++ = bMask;
                             *ptrDst++ = gMask;
+                            *ptrDst++ = bMask;
                             break;
                         }
                         // else: !transparent
@@ -452,8 +445,8 @@ void CopyDataFromPNG(wxImage *image,
                         if ( IsTransparent(a) )
                         {
                             *ptrDst++ = rMask;
-                            *ptrDst++ = bMask;
                             *ptrDst++ = gMask;
+                            *ptrDst++ = bMask;
                             break;
                         }
                         else // !transparent
@@ -545,7 +538,7 @@ wxPNGHandler::LoadFile(wxImage *image,
         goto error;
 
     png_read_info( png_ptr, info_ptr );
-    png_get_IHDR( png_ptr, info_ptr, &width, &height, &bit_depth, &color_type, &interlace_type, (int*) NULL, (int*) NULL );
+    png_get_IHDR( png_ptr, info_ptr, &width, &height, &bit_depth, &color_type, &interlace_type, NULL, NULL );
 
     if (color_type == PNG_COLOR_TYPE_PALETTE)
         png_set_expand( png_ptr );
@@ -565,18 +558,16 @@ wxPNGHandler::LoadFile(wxImage *image,
     if (!image->Ok())
         goto error;
 
-    lines = (unsigned char **)malloc( (size_t)(height * sizeof(unsigned char *)) );
+    // initialize all line pointers to NULL to ensure that they can be safely
+    // free()d if an error occurs before all of them could be allocated
+    lines = (unsigned char **)calloc(height, sizeof(unsigned char *));
     if ( !lines )
         goto error;
 
     for (i = 0; i < height; i++)
     {
         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] );
             goto error;
-        }
     }
 
     png_read_image( png_ptr, lines );
@@ -698,9 +689,6 @@ bool wxPNGHandler::SaveFile( wxImage *image, wxOutputStream& stream, bool verbos
                             ? image->GetOptionInt(wxIMAGE_OPTION_PNG_BITDEPTH)
                             : 8;
 
-    wxASSERT_MSG( iBitDepth == 8 || iBitDepth == 16,
-                    _T("PNG bit depth must be 8 or 16") );
-
     bool bHasAlpha = image->HasAlpha();
     bool bHasMask = image->HasMask();
     bool bUseAlpha = bHasAlpha || bHasMask;
@@ -717,6 +705,21 @@ bool wxPNGHandler::SaveFile( wxImage *image, wxOutputStream& stream, bool verbos
                                   : PNG_COLOR_TYPE_GRAY;
     }
 
+    if (image->HasOption(wxIMAGE_OPTION_PNG_FILTER))
+        png_set_filter( png_ptr, PNG_FILTER_TYPE_BASE, image->GetOptionInt(wxIMAGE_OPTION_PNG_FILTER) );
+
+    if (image->HasOption(wxIMAGE_OPTION_PNG_COMPRESSION_LEVEL))
+        png_set_compression_level( png_ptr, image->GetOptionInt(wxIMAGE_OPTION_PNG_COMPRESSION_LEVEL) );
+
+    if (image->HasOption(wxIMAGE_OPTION_PNG_COMPRESSION_MEM_LEVEL))
+        png_set_compression_mem_level( png_ptr, image->GetOptionInt(wxIMAGE_OPTION_PNG_COMPRESSION_MEM_LEVEL) );
+
+    if (image->HasOption(wxIMAGE_OPTION_PNG_COMPRESSION_STRATEGY))
+        png_set_compression_strategy( png_ptr, image->GetOptionInt(wxIMAGE_OPTION_PNG_COMPRESSION_STRATEGY) );
+
+    if (image->HasOption(wxIMAGE_OPTION_PNG_COMPRESSION_BUFFER_SIZE))
+        png_set_compression_buffer_size( png_ptr, image->GetOptionInt(wxIMAGE_OPTION_PNG_COMPRESSION_BUFFER_SIZE) );
+
     png_set_IHDR( png_ptr, info_ptr, image->GetWidth(), image->GetHeight(),
                   iBitDepth, iPngColorType,
                   PNG_INTERLACE_NONE, PNG_COMPRESSION_TYPE_BASE,
@@ -747,6 +750,33 @@ bool wxPNGHandler::SaveFile( wxImage *image, wxOutputStream& stream, bool verbos
     if ( iBitDepth == 16 )
         iElements *= 2;
 
+    // save the image resolution if we have it
+    int resX, resY;
+    switch ( GetResolutionFromOptions(*image, &resX, &resY) )
+    {
+        case wxIMAGE_RESOLUTION_INCHES:
+            {
+                const double INCHES_IN_METER = 10000.0 / 254;
+                resX = int(resX * INCHES_IN_METER);
+                resY = int(resY * INCHES_IN_METER);
+            }
+            break;
+
+        case wxIMAGE_RESOLUTION_CM:
+            resX *= 100;
+            resY *= 100;
+            break;
+
+        case wxIMAGE_RESOLUTION_NONE:
+            break;
+
+        default:
+            wxFAIL_MSG( _T("unsupported image resolution units") );
+    }
+
+    if ( resX && resY )
+        png_set_pHYs( png_ptr, info_ptr, resX, resY, PNG_RESOLUTION_METER );
+
     png_set_sBIT( png_ptr, info_ptr, &sig_bit );
     png_write_info( png_ptr, info_ptr );
     png_set_shift( png_ptr, &sig_bit );