X-Git-Url: https://git.saurik.com/wxWidgets.git/blobdiff_plain/700ec4546cfa7a89b3bca0a4eb5b6ee9d43ac17a..acc0ebd7a871124d4d6b36069340227e6c584f38:/src/common/imagjpeg.cpp

diff --git a/src/common/imagjpeg.cpp b/src/common/imagjpeg.cpp
index 6676597e79..1e8457fc9b 100644
--- a/src/common/imagjpeg.cpp
+++ b/src/common/imagjpeg.cpp
@@ -7,10 +7,9 @@
 // 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"
@@ -21,9 +20,9 @@
 
 #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"
@@ -56,18 +55,19 @@ extern "C"
 // wxJPEGHandler
 //-----------------------------------------------------------------------------
 
-#if !USE_SHARED_LIBRARIES
 IMPLEMENT_DYNAMIC_CLASS(wxJPEGHandler,wxImageHandler)
-#endif
 
 #if wxUSE_STREAMS
 
 //------------- 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;
@@ -76,24 +76,46 @@ METHODDEF(void) my_init_source ( j_decompress_ptr WXUNUSED(cinfo) )
 {
 }
 
-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 )
@@ -107,10 +129,10 @@ 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;
@@ -148,7 +170,11 @@ my_error_exit (j_common_ptr cinfo)
   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) )
 {
@@ -169,7 +195,8 @@ bool wxJPEGHandler::LoadFile( wxImage *image, wxInputStream& stream, bool verbos
       /* 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) wxLogError(_("Couldn't load a JPEG image - probably file is corrupted."));
+      if (verbose)
+        wxLogError(_("JPEG: Couldn't load - file is probably corrupted."));
       jpeg_destroy_decompress(&cinfo);
       if (image->Ok()) image->Destroy();
       return FALSE;
@@ -203,10 +230,6 @@ bool wxJPEGHandler::LoadFile( wxImage *image, wxInputStream& stream, bool verbos
     return TRUE;
 }
 
-
-
-
-
 typedef struct {
     struct jpeg_destination_mgr pub;
 
@@ -280,13 +303,15 @@ bool wxJPEGHandler::SaveFile( wxImage *image, wxOutputStream& stream, bool verbo
     if (!verbose) cinfo.err->output_message=NULL;
 
     /* Establish the setjmp return context for my_error_exit to use. */
-    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) wxLogError(_("Couldn't save a JPEG image - probably file is corrupted."));
-      jpeg_destroy_compress(&cinfo);
-      return FALSE;
+    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)
+            wxLogError(_("JPEG: Couldn't save image."));
+         jpeg_destroy_compress(&cinfo);
+         return FALSE;
     }
 
     jpeg_create_compress(&cinfo);
@@ -297,6 +322,16 @@ bool wxJPEGHandler::SaveFile( wxImage *image, wxOutputStream& stream, bool verbo
     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 */
@@ -311,12 +346,15 @@ bool wxJPEGHandler::SaveFile( wxImage *image, wxOutputStream& stream, bool verbo
     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);
 }