#include "wx/imagtga.h"
#include "wx/log.h"
+#include "wx/scopeguard.h"
// ----------------------------------------------------------------------------
// constants
// TGA error codes.
enum
{
- wxTGA_OK = 0,
- wxTGA_INVFORMAT = 1,
- wxTGA_MEMERR = 2
+ wxTGA_OK,
+ wxTGA_INVFORMAT,
+ wxTGA_MEMERR,
+ wxTGA_IOERR
};
// TGA header bytes.
}
}
+// return wxTGA_OK or wxTGA_IOERR
static
-void DecodeRLE(unsigned char* imageData, unsigned long imageSize,
+int DecodeRLE(unsigned char* imageData, unsigned long imageSize,
short pixelSize, wxInputStream& stream)
{
unsigned long index = 0;
while (index < imageSize)
{
- current = stream.GetC();
+ int ch = stream.GetC();
+ if ( ch == wxEOF )
+ return wxTGA_IOERR;
+
+ current = ch;
// RLE packet.
if ( current & 0x80 )
index += current * pixelSize;
// Repeat the pixel length times.
- stream.Read(buf, pixelSize);
+ if ( !stream.Read(buf, pixelSize) )
+ return wxTGA_IOERR;
for (unsigned int i = 0; i < length; i++)
{
index += length;
// Write the next length pixels directly to the image data.
- stream.Read(imageData, length);
+ if ( !stream.Read(imageData, length) )
+ return wxTGA_IOERR;
imageData += length;
}
}
+
+ return wxTGA_OK;
}
static
return wxTGA_MEMERR;
}
+ wxON_BLOCK_EXIT1(free, imageData);
+
unsigned char *dst = image->GetData();
unsigned char* alpha = NULL;
}
// Seek from the offset we got from the TGA header.
- stream.SeekI(offset, wxFromStart);
+ if (stream.SeekI(offset, wxFromStart) == wxInvalidOffset)
+ return wxTGA_INVFORMAT;
// Load a palette if we have one.
if (colorType == wxTGA_MAPPED)
// Decode the RLE data.
- DecodeRLE(imageData, imageSize, pixelSize, stream);
+ int rc = DecodeRLE(imageData, imageSize, pixelSize, stream);
+ if ( rc != wxTGA_OK )
+ return rc;
// If orientation == 0, then the image is stored upside down.
// We need to store it right side up.
{
// Decode the RLE data.
- DecodeRLE(imageData, imageSize, pixelSize, stream);
+ int rc = DecodeRLE(imageData, imageSize, pixelSize, stream);
+ if ( rc != wxTGA_OK )
+ return rc;
// If orientation == 0, then the image is stored upside down.
// We need to store it right side up.
{
// Decode the RLE data.
- DecodeRLE(imageData, imageSize, pixelSize, stream);
+ int rc = DecodeRLE(imageData, imageSize, pixelSize, stream);
+ if ( rc != wxTGA_OK )
+ return rc;
// If orientation == 0, then the image is stored upside down.
// We need to store it right side up.
return wxTGA_INVFORMAT;
}
- free(imageData);
-
return wxTGA_OK;
}
static
-int SaveTGA(wxImage* WXUNUSED(image), wxOutputStream& WXUNUSED(stream))
+int SaveTGA(const wxImage& image, wxOutputStream *stream)
{
- wxLogError(wxT("Saving in TGA format is not implemented."));
+ bool hasAlpha = image.HasAlpha();
+ unsigned bytesPerPixel = 3 + (hasAlpha ? 1 : 0);
+ wxSize size = image.GetSize();
+ size_t scanlineSize = size.x * bytesPerPixel;
+ unsigned char *scanlineData = (unsigned char *) malloc(scanlineSize);
+ if (!scanlineData)
+ {
+ return wxTGA_MEMERR;
+ }
+
+ wxON_BLOCK_EXIT1(free, scanlineData);
+
+ // Compose and write the TGA header
+ unsigned char hdr[HDR_SIZE];
+ (void) memset(&hdr, 0, HDR_SIZE);
+
+ hdr[HDR_COLORTYPE] = wxTGA_UNMAPPED;
+ hdr[HDR_IMAGETYPE] = 2 /* Uncompressed truecolour */;
+
+ hdr[HDR_WIDTH] = size.x & 0xFF;
+ hdr[HDR_WIDTH + 1] = (size.x >> 8) & 0xFF;
+
+ hdr[HDR_HEIGHT] = size.y & 0xFF;
+ hdr[HDR_HEIGHT + 1] = (size.y >> 8) & 0xFF;
+
+ hdr[HDR_BPP] = hasAlpha ? 32 : 24;
+ hdr[HDR_ORIENTATION] = 1 << 5; // set bit to indicate top-down order
+ if (hasAlpha)
+ {
+ hdr[HDR_ORIENTATION] |= 8; // number of alpha bits
+ }
+
+ if ( !stream->Write(hdr, HDR_SIZE) )
+ {
+ return wxTGA_IOERR;
+ }
+
+
+ // Write image data, converting RGB to BGR and adding alpha if applicable
+
+ unsigned char *src = image.GetData();
+ unsigned char *alpha = image.GetAlpha();
+ for (int y = 0; y < size.y; ++y)
+ {
+ unsigned char *dst = scanlineData;
+ for (int x = 0; x < size.x; ++x)
+ {
+ dst[0] = src[2];
+ dst[1] = src[1];
+ dst[2] = src[0];
+ if (alpha)
+ {
+ dst[3] = *(alpha++);
+ }
+ src += 3;
+ dst += bytesPerPixel;
+ }
+ if ( !stream->Write(scanlineData, scanlineSize) )
+ {
+ return wxTGA_IOERR;
+ }
+ }
return wxTGA_OK;
}
if ( !CanRead(stream) )
{
if ( verbose )
+ {
wxLogError(wxT("TGA: this is not a TGA file."));
+ }
return false;
}
wxLogError(wxT("TGA: couldn't allocate memory."));
break;
+ case wxTGA_IOERR:
+ wxLogError(wxT("TGA: couldn't read image data."));
+ break;
+
default:
wxLogError(wxT("TGA: unknown error!"));
}
bool wxTGAHandler::SaveFile(wxImage* image, wxOutputStream& stream, bool verbose)
{
- int error = SaveTGA(image, stream);
+ int error = SaveTGA(*image, &stream);
if ( error != wxTGA_OK )
{
{
switch ( error )
{
- case wxTGA_INVFORMAT:
- wxLogError(wxT("TGA: invalid image."));
- break;
-
case wxTGA_MEMERR:
wxLogError(wxT("TGA: couldn't allocate memory."));
break;
+ case wxTGA_IOERR:
+ wxLogError(wxT("TGA: couldn't write image data."));
+ break;
+
default:
wxLogError(wxT("TGA: unknown error!"));
}
{
// read the fixed-size TGA headers
unsigned char hdr[HDR_SIZE];
- stream.Read(hdr, HDR_SIZE);
+ stream.Read(hdr, HDR_SIZE); // it's ok to modify the stream position here
// Check wether we can read the file or not.
projects / wxWidgets.git / blobdiff