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

/////////////////////////////////////////////////////////////////////////////
// Name:        imagtga.cpp
// Purpose:     wxImage TGA handler
// Author:      Seth Jackson
// CVS-ID:      $Id$
// Copyright:   (c) 2005 Seth Jackson
// Licence:     wxWindows licence
/////////////////////////////////////////////////////////////////////////////

// ============================================================================
// declarations
// ============================================================================

// ----------------------------------------------------------------------------
// headers
// ----------------------------------------------------------------------------

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

#ifdef __BORLANDC__
  #pragma hdrstop
#endif

#if wxUSE_IMAGE && wxUSE_TGA

#ifndef WX_PRECOMP
    #include "wx/palette.h"
#endif

#include "wx/imagtga.h"
#include "wx/log.h"
#include "wx/scopeguard.h"

// ----------------------------------------------------------------------------
// constants
// ----------------------------------------------------------------------------

// TGA error codes.
enum
{
    wxTGA_OK,
    wxTGA_INVFORMAT,
    wxTGA_MEMERR,
    wxTGA_IOERR
};

// TGA header bytes.
enum
{
    HDR_OFFSET = 0,
    HDR_COLORTYPE  = 1,
    HDR_IMAGETYPE = 2,
    HDR_PALETTESTART = 3,
    HDR_PALETTELENGTH = 5,
    HDR_PALETTEBITS = 7,
    HDR_XORIGIN = 8,
    HDR_YORIGIN = 10,
    HDR_WIDTH = 12,
    HDR_HEIGHT = 14,
    HDR_BPP = 16,
    HDR_ORIENTATION = 17,
    HDR_SIZE
};

// TGA color types.
enum
{
    wxTGA_UNMAPPED = 0,
    wxTGA_MAPPED = 1
};

// ============================================================================
// implementation
// ============================================================================

IMPLEMENT_DYNAMIC_CLASS(wxTGAHandler, wxImageHandler)

#if wxUSE_STREAMS

// ----------------------------------------------------------------------------
// worker functions
// ----------------------------------------------------------------------------

static
void FlipTGA(unsigned char* imageData, int width, int height, short pixelSize)
{
    int lineLength = width * pixelSize;
    unsigned char *line1 = imageData;
    unsigned char *line2 = &imageData[lineLength * (height - 1)];

    unsigned char temp;
    for ( ; line1 < line2; line2 -= (lineLength * 2))
    {
        for (int index = 0; index < lineLength; line1++, line2++, index++)
        {
            temp = *line1;
            *line1 = *line2;
            *line2 = temp;
        }
    }
}

// return wxTGA_OK or wxTGA_IOERR
static
int DecodeRLE(unsigned char* imageData, unsigned long imageSize,
               short pixelSize, wxInputStream& stream)
{
    unsigned long index = 0;
    unsigned char current;
    unsigned int length;
    unsigned char buf[4];

    while (index < imageSize)
    {
        int ch = stream.GetC();
        if ( ch == wxEOF )
            return wxTGA_IOERR;

        current = ch;

        // RLE packet.
        if ( current & 0x80 )
        {
            // Get the run length of the packet.
            current &= 0x7f;

            current++;

            length = current;

            index += current * pixelSize;

            // Repeat the pixel length times.
            if ( !stream.Read(buf, pixelSize) )
                return wxTGA_IOERR;

            for (unsigned int i = 0; i < length; i++)
            {
                memcpy(imageData, buf, pixelSize);

                imageData += pixelSize;
            }
        }
        else // Raw packet.
        {
            // Get the run length of the packet.
            current++;

            length = current * pixelSize;

            index += length;

            // Write the next length pixels directly to the image data.
            if ( !stream.Read(imageData, length) )
                return wxTGA_IOERR;

            imageData += length;
        }
    }

    return wxTGA_OK;
}

static
int ReadTGA(wxImage* image, wxInputStream& stream)
{
    // Read in the TGA header
    unsigned char hdr[HDR_SIZE];
    stream.Read(hdr, HDR_SIZE);

    short offset = hdr[HDR_OFFSET] + HDR_SIZE;
    short colorType = hdr[HDR_COLORTYPE];
    short imageType = hdr[HDR_IMAGETYPE];
    int paletteLength = hdr[HDR_PALETTELENGTH] + 256 * hdr[HDR_PALETTELENGTH + 1];
    int width = (hdr[HDR_WIDTH] + 256 * hdr[HDR_WIDTH + 1]) -
                (hdr[HDR_XORIGIN] + 256 * hdr[HDR_XORIGIN + 1]);
    int height = (hdr[HDR_HEIGHT] + 256 * hdr[HDR_HEIGHT + 1]) -
                 (hdr[HDR_YORIGIN] + 256 * hdr[HDR_YORIGIN + 1]);
    short bpp = hdr[HDR_BPP];
    short orientation = hdr[HDR_ORIENTATION] & 0x20;

    image->Create(width, height);

    if (!image->Ok())
    {
        return wxTGA_MEMERR;
    }

    const short pixelSize = bpp / 8;

    const unsigned long imageSize = width * height * pixelSize;

    unsigned char *imageData = (unsigned char* )malloc(imageSize);

    if (!imageData)
    {
        return wxTGA_MEMERR;
    }

    wxON_BLOCK_EXIT1(free, imageData);

    unsigned char *dst = image->GetData();

    unsigned char* alpha = NULL;
    if (bpp == 16 || bpp == 32)
    {
        image->SetAlpha();

        alpha = image->GetAlpha();
    }

    // Seek from the offset we got from the TGA header.
    if (stream.SeekI(offset, wxFromStart) == wxInvalidOffset)
        return wxTGA_INVFORMAT;

    // Load a palette if we have one.
    if (colorType == wxTGA_MAPPED)
    {
        unsigned char buf[3];

        unsigned char* r = new unsigned char[paletteLength];
        unsigned char* g = new unsigned char[paletteLength];
        unsigned char* b = new unsigned char[paletteLength];

        for (int i = 0; i < paletteLength; i++)
        {
            stream.Read(buf, 3);

            r[i] = buf[2];
            g[i] = buf[1];
            b[i] = buf[0];
        }

#if wxUSE_PALETTE
        // Set the palette of the image.
        image->SetPalette(wxPalette(paletteLength, r, g, b));
#endif // wxUSE_PALETTE

        delete[] r;
        delete[] g;
        delete[] b;
    }

    // Handle the various TGA formats we support.

    switch (imageType)
    {
#if wxUSE_PALETTE
        // Raw indexed.

        case 1:
        {
            const wxPalette& palette = image->GetPalette();
            unsigned char r;
            unsigned char g;
            unsigned char b;

            // No compression read the data directly to imageData.

            stream.Read(imageData, imageSize);

            // If orientation == 0, then the image is stored upside down.
            // We need to store it right side up.

            if (orientation == 0)
            {
                FlipTGA(imageData, width, height, pixelSize);
            }

            // Handle the different pixel depths.

            switch (bpp)
            {
                // 8 bpp.

                case 8:
                {
                    for (unsigned long index = 0; index < imageSize; index += pixelSize)
                    {
                        palette.GetRGB(imageData[index], &r, &g, &b);

                        *(dst++) = r;
                        *(dst++) = g;
                        *(dst++) = b;
                    }
                }
                break;

                // 16 bpp.

                case 16:
                {
                    for (unsigned long index = 0; index < imageSize; index += pixelSize)
                    {
                        palette.GetRGB(imageData[index], &r, &g, &b);

                        *(dst++) = r;
                        *(dst++) = g;
                        *(dst++) = b;
                        *(alpha++) = (imageData[index + 1] & 0x80) ? 0 : 255;
                    }
                }
                break;

                default:
                    return wxTGA_INVFORMAT;
            }
        }
        break;
#endif // wxUSE_PALETTE

        // Raw RGB.

        case 2:
        {
            // No compression read the data directly to imageData.

            stream.Read(imageData, imageSize);

            // If orientation == 0, then the image is stored upside down.
            // We need to store it right side up.

            if (orientation == 0)
            {
                FlipTGA(imageData, width, height, pixelSize);
            }

            // Handle the different pixel depths.

            switch (bpp)
            {
                //16 bpp.

                case 16:
                {
                    unsigned char temp;

                    for (unsigned long index = 0; index < imageSize; index += pixelSize)
                    {
                        temp = (imageData[index + 1] & 0x7c) << 1;
                        temp |= temp >> 5;
                        *(dst++) = temp;

                        temp = ((imageData[index + 1] & 0x03) << 6) | ((imageData[index] & 0xe0) >> 2);
                        temp |= temp >> 5;
                        *(dst++) = temp;

                        temp = (imageData[index] & 0x1f) << 3;
                        temp |= temp >> 5;
                        *(dst++) = temp;

                        *(alpha++) = (imageData[index + 1] & 0x80) ? 0 : 255;
                    }
                }
                break;

                // 24 bpp.

                case 24:
                {
                    for (unsigned long index = 0; index < imageSize; index += pixelSize)
                    {
                        *(dst++) = imageData[index + 2];
                        *(dst++) = imageData[index + 1];
                        *(dst++) = imageData[index];
                    }
                }
                break;

                // 32 bpp.

                case 32:
                {
                    for (unsigned long index = 0; index < imageSize; index += pixelSize)
                    {
                        *(dst++) = imageData[index + 2];
                        *(dst++) = imageData[index + 1];
                        *(dst++) = imageData[index];
                        *(alpha++) = imageData[index + 3];
                    }
                }
                break;

                default:
                    return wxTGA_INVFORMAT;
            }
        }
        break;

        // Raw grayscale.

        case 3:
        {
            // No compression read the data directly to imageData.

            stream.Read(imageData, imageSize);

            // If orientation == 0, then the image is stored upside down.
            // We need to store it right side up.

            if (orientation == 0)
            {
                FlipTGA(imageData, width, height, pixelSize);
            }

            // Handle the different pixel depths.

            switch (bpp)
            {
                // 8 bpp.

                case 8:
                {
                    for (unsigned long index = 0; index < imageSize; index += pixelSize)
                    {
                        *(dst++) = imageData[index];
                        *(dst++) = imageData[index];
                        *(dst++) = imageData[index];
                    }
                }
                break;

                // 16 bpp.

                case 16:
                {
                    for (unsigned long index = 0; index < imageSize; index += pixelSize)
                    {
                        *(dst++) = imageData[index];
                        *(dst++) = imageData[index];
                        *(dst++) = imageData[index];
                        *(alpha++) = imageData[index + 1];
                    }
                }
                break;

                default:
                    return wxTGA_INVFORMAT;
            }
        }
        break;

#if wxUSE_PALETTE
        // RLE indexed.

        case 9:
        {
            const wxPalette& palette = image->GetPalette();
            unsigned char r;
            unsigned char g;
            unsigned char b;

            // Decode the RLE data.

            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.

            if (orientation == 0)
            {
                FlipTGA(imageData, width, height, pixelSize);
            }

            // Handle the different pixel depths.

            switch (bpp)
            {
                // 8 bpp.

                case 8:
                {
                    for (unsigned long index = 0; index < imageSize; index += pixelSize)
                    {
                        palette.GetRGB(imageData[index], &r, &g, &b);

                        *(dst++) = r;
                        *(dst++) = g;
                        *(dst++) = b;
                    }
                }
                break;

                // 16 bpp.

                case 16:
                {
                    for (unsigned long index = 0; index < imageSize; index += pixelSize)
                    {
                        palette.GetRGB(imageData[index], &r, &g, &b);

                        *(dst++) = r;
                        *(dst++) = g;
                        *(dst++) = b;
                        *(alpha++) = (imageData[index + 1] & 0x80) ? 0 : 255;
                    }
                }
                break;

                default:
                    return wxTGA_INVFORMAT;
            }
        }
        break;
#endif // wxUSE_PALETTE

        // RLE RGB.

        case 10:
        {
            // Decode the RLE data.

            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.

            if (orientation == 0)
            {
                FlipTGA(imageData, width, height, pixelSize);
            }

            // Handle the different pixel depths.

            switch (bpp)
            {
                //16 bpp.

                case 16:
                {
                    unsigned char temp;

                    for (unsigned long index = 0; index < imageSize; index += pixelSize)
                    {
                        temp = (imageData[index + 1] & 0x7c) << 1;
                        temp |= temp >> 5;
                        *(dst++) = temp;

                        temp = ((imageData[index + 1] & 0x03) << 6) | ((imageData[index] & 0xe0) >> 2);
                        temp |= temp >> 5;
                        *(dst++) = temp;

                        temp = (imageData[index] & 0x1f) << 3;
                        temp |= temp >> 5;
                        *(dst++) = temp;

                        *(alpha++) = (imageData[index + 1] & 0x80) ? 0 : 255;
                    }
                }
                break;

                // 24 bpp.

                case 24:
                {
                    for (unsigned long index = 0; index < imageSize; index += pixelSize)
                    {
                        *(dst++) = imageData[index + 2];
                        *(dst++) = imageData[index + 1];
                        *(dst++) = imageData[index];
                    }
                }
                break;

                // 32 bpp.

                case 32:
                {
                    for (unsigned long index = 0; index < imageSize; index += pixelSize)
                    {
                        *(dst++) = imageData[index + 2];
                        *(dst++) = imageData[index + 1];
                        *(dst++) = imageData[index];
                        *(alpha++) = imageData[index + 3];
                    }
                }
                break;

                default:
                    return wxTGA_INVFORMAT;
            }
        }
        break;

        // RLE grayscale.

        case 11:
        {
            // Decode the RLE data.

            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.

            if (orientation == 0)
            {
                FlipTGA(imageData, width, height, pixelSize);
            }

            // Handle the different pixel depths.

            switch (bpp)
            {
                // 8 bpp.

                case 8:
                {
                    for (unsigned long index = 0; index < imageSize; index += pixelSize)
                    {
                        *(dst++) = imageData[index];
                        *(dst++) = imageData[index];
                        *(dst++) = imageData[index];
                    }
                }
                break;

                // 16 bpp.

                case 16:
                {
                    for (unsigned long index = 0; index < imageSize; index += pixelSize)
                    {
                        *(dst++) = imageData[index];
                        *(dst++) = imageData[index];
                        *(dst++) = imageData[index];
                        *(alpha++) = imageData[index + 1];
                    }
                }
                break;

                default:
                    return wxTGA_INVFORMAT;
            }
        }
        break;

        default:
            return wxTGA_INVFORMAT;
    }

    return wxTGA_OK;
}

static
int SaveTGA(wxImage* WXUNUSED(image), wxOutputStream& WXUNUSED(stream))
{
    wxLogError(wxT("Saving in TGA format is not implemented."));

    return wxTGA_OK;
}

// ----------------------------------------------------------------------------
// wxTGAHandler
// ----------------------------------------------------------------------------

bool wxTGAHandler::LoadFile(wxImage* image,
                            wxInputStream& stream,
                            bool verbose,
                            int WXUNUSED(index))
{
    if ( !CanRead(stream) )
    {
        if ( verbose )
        {
            wxLogError(wxT("TGA: this is not a TGA file."));
        }

        return false;
    }

    image->Destroy();

    int error = ReadTGA(image, stream);
    if ( error != wxTGA_OK )
    {
        if ( verbose )
        {
            switch ( error )
            {
                case wxTGA_INVFORMAT:
                    wxLogError(wxT("TGA: image format unsupported."));
                    break;

                case wxTGA_MEMERR:
                    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!"));
            }
        }

        image->Destroy();

        return false;
    }

    return true;
}

bool wxTGAHandler::SaveFile(wxImage* image, wxOutputStream& stream, bool verbose)
{
    int error = SaveTGA(image, stream);

    if ( error != wxTGA_OK )
    {
        if ( verbose )
        {
            switch ( error )
            {
                case wxTGA_INVFORMAT:
                    wxLogError(wxT("TGA: invalid image."));
                    break;

                case wxTGA_MEMERR:
                    wxLogError(wxT("TGA: couldn't allocate memory."));
                    break;

                default:
                    wxLogError(wxT("TGA: unknown error!"));
            }
        }

        return false;
    }

    return true;
}

bool wxTGAHandler::DoCanRead(wxInputStream& stream)
{
    // read the fixed-size TGA headers
    unsigned char 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.

    short colorType = hdr[HDR_COLORTYPE];
    if ( colorType != wxTGA_UNMAPPED && colorType != wxTGA_MAPPED )
    {
        return false;
    }

    short imageType = hdr[HDR_IMAGETYPE];
    if ( imageType == 0 || imageType == 32 || imageType == 33 )
    {
        return false;
    }

    short bpp = hdr[HDR_BPP];
    if ( bpp != 8 && bpp != 16 && bpp != 24 && bpp != 32 )
    {
        return false;
    }

    return true;
}

#endif // wxUSE_STREAMS

#endif // wxUSE_IMAGE && wxUSE_TGA
Commit	Line	Data
3af706cc VZ	1	/////////////////////////////////////////////////////////////////////////////
	2	// Name: imagtga.cpp
	3	// Purpose: wxImage TGA handler
	4	// Author: Seth Jackson
	5	// CVS-ID: $Id$
	6	// Copyright: (c) 2005 Seth Jackson
	7	// Licence: wxWindows licence
	8	/////////////////////////////////////////////////////////////////////////////
	9
	10	// ============================================================================
	11	// declarations
	12	// ============================================================================
	13
	14	// ----------------------------------------------------------------------------
	15	// headers
	16	// ----------------------------------------------------------------------------
	17
	18	// For compilers that support precompilation, includes "wx.h".
	19	#include "wx/wxprec.h"
	20
	21	#ifdef __BORLANDC__
	22	#pragma hdrstop
	23	#endif
	24
	25	#if wxUSE_IMAGE && wxUSE_TGA
	26
	27	#ifndef WX_PRECOMP
	28	#include "wx/palette.h"
	29	#endif
	30
	31	#include "wx/imagtga.h"
	32	#include "wx/log.h"
56692119	33	#include "wx/scopeguard.h"
3af706cc VZ	34
	35	// ----------------------------------------------------------------------------
	36	// constants
	37	// ----------------------------------------------------------------------------
	38
	39	// TGA error codes.
	40	enum
	41	{
8fee6306 VZ	42	wxTGA_OK,
	43	wxTGA_INVFORMAT,
	44	wxTGA_MEMERR,
	45	wxTGA_IOERR
3af706cc VZ	46	};
	47
	48	// TGA header bytes.
	49	enum
	50	{
	51	HDR_OFFSET = 0,
	52	HDR_COLORTYPE = 1,
	53	HDR_IMAGETYPE = 2,
	54	HDR_PALETTESTART = 3,
	55	HDR_PALETTELENGTH = 5,
	56	HDR_PALETTEBITS = 7,
	57	HDR_XORIGIN = 8,
	58	HDR_YORIGIN = 10,
	59	HDR_WIDTH = 12,
	60	HDR_HEIGHT = 14,
	61	HDR_BPP = 16,
	62	HDR_ORIENTATION = 17,
	63	HDR_SIZE
	64	};
	65
	66	// TGA color types.
	67	enum
	68	{
	69	wxTGA_UNMAPPED = 0,
	70	wxTGA_MAPPED = 1
	71	};
	72
	73	// ============================================================================
	74	// implementation
	75	// ============================================================================
	76
	77	IMPLEMENT_DYNAMIC_CLASS(wxTGAHandler, wxImageHandler)
	78
	79	#if wxUSE_STREAMS
	80
	81	// ----------------------------------------------------------------------------
	82	// worker functions
	83	// ----------------------------------------------------------------------------
	84
	85	static
	86	void FlipTGA(unsigned char* imageData, int width, int height, short pixelSize)
	87	{
	88	int lineLength = width * pixelSize;
	89	unsigned char *line1 = imageData;
	90	unsigned char line2 = &imageData[lineLength (height - 1)];
	91
	92	unsigned char temp;
	93	for ( ; line1 < line2; line2 -= (lineLength * 2))
	94	{
	95	for (int index = 0; index < lineLength; line1++, line2++, index++)
	96	{
	97	temp = *line1;
	98	line1 = line2;
	99	*line2 = temp;
	100	}
	101	}
	102	}
	103
8fee6306	104	// return wxTGA_OK or wxTGA_IOERR
3af706cc	105	static
8fee6306	106	int DecodeRLE(unsigned char* imageData, unsigned long imageSize,
3af706cc VZ	107	short pixelSize, wxInputStream& stream)
	108	{
	109	unsigned long index = 0;
	110	unsigned char current;
	111	unsigned int length;
	112	unsigned char buf[4];
	113
	114	while (index < imageSize)
	115	{
8fee6306 VZ	116	int ch = stream.GetC();
	117	if ( ch == wxEOF )
	118	return wxTGA_IOERR;
	119
	120	current = ch;
3af706cc VZ	121
	122	// RLE packet.
	123	if ( current & 0x80 )
	124	{
	125	// Get the run length of the packet.
	126	current &= 0x7f;
	127
	128	current++;
	129
	130	length = current;
	131
	132	index += current * pixelSize;
	133
	134	// Repeat the pixel length times.
8fee6306 VZ	135	if ( !stream.Read(buf, pixelSize) )
8fee6306 VZ	136	return wxTGA_IOERR;
3af706cc VZ	137
	138	for (unsigned int i = 0; i < length; i++)
	139	{
	140	memcpy(imageData, buf, pixelSize);
	141
	142	imageData += pixelSize;
	143	}
	144	}
	145	else // Raw packet.
	146	{
	147	// Get the run length of the packet.
	148	current++;
	149
	150	length = current * pixelSize;
	151
	152	index += length;
	153
	154	// Write the next length pixels directly to the image data.
8fee6306 VZ	155	if ( !stream.Read(imageData, length) )
8fee6306 VZ	156	return wxTGA_IOERR;
3af706cc VZ	157
	158	imageData += length;
	159	}
	160	}
8fee6306 VZ	161
8fee6306 VZ	162	return wxTGA_OK;
3af706cc VZ	163	}
	164
	165	static
	166	int ReadTGA(wxImage* image, wxInputStream& stream)
	167	{
	168	// Read in the TGA header
	169	unsigned char hdr[HDR_SIZE];
	170	stream.Read(hdr, HDR_SIZE);
	171
	172	short offset = hdr[HDR_OFFSET] + HDR_SIZE;
	173	short colorType = hdr[HDR_COLORTYPE];
	174	short imageType = hdr[HDR_IMAGETYPE];
	175	int paletteLength = hdr[HDR_PALETTELENGTH] + 256 * hdr[HDR_PALETTELENGTH + 1];
	176	int width = (hdr[HDR_WIDTH] + 256 * hdr[HDR_WIDTH + 1]) -
	177	(hdr[HDR_XORIGIN] + 256 * hdr[HDR_XORIGIN + 1]);
	178	int height = (hdr[HDR_HEIGHT] + 256 * hdr[HDR_HEIGHT + 1]) -
	179	(hdr[HDR_YORIGIN] + 256 * hdr[HDR_YORIGIN + 1]);
	180	short bpp = hdr[HDR_BPP];
	181	short orientation = hdr[HDR_ORIENTATION] & 0x20;
	182
	183	image->Create(width, height);
	184
	185	if (!image->Ok())
	186	{
	187	return wxTGA_MEMERR;
	188	}
	189
	190	const short pixelSize = bpp / 8;
	191
	192	const unsigned long imageSize = width * height * pixelSize;
	193
	194	unsigned char imageData = (unsigned char )malloc(imageSize);
	195
	196	if (!imageData)
	197	{
	198	return wxTGA_MEMERR;
	199	}
	200
56692119 VZ	201	wxON_BLOCK_EXIT1(free, imageData);
56692119 VZ	202
3af706cc VZ	203	unsigned char *dst = image->GetData();
	204
	205	unsigned char* alpha = NULL;
	206	if (bpp == 16 \|\| bpp == 32)
	207	{
	208	image->SetAlpha();
	209
	210	alpha = image->GetAlpha();
	211	}
	212
	213	// Seek from the offset we got from the TGA header.
b81e4506 FM	214	if (stream.SeekI(offset, wxFromStart) == wxInvalidOffset)
b81e4506 FM	215	return wxTGA_INVFORMAT;
3af706cc VZ	216
	217	// Load a palette if we have one.
	218	if (colorType == wxTGA_MAPPED)
	219	{
	220	unsigned char buf[3];
	221
	222	unsigned char* r = new unsigned char[paletteLength];
	223	unsigned char* g = new unsigned char[paletteLength];
	224	unsigned char* b = new unsigned char[paletteLength];
	225
	226	for (int i = 0; i < paletteLength; i++)
	227	{
	228	stream.Read(buf, 3);
	229
	230	r[i] = buf[2];
	231	g[i] = buf[1];
	232	b[i] = buf[0];
	233	}
	234
6e3d5828	235	#if wxUSE_PALETTE
3af706cc	236	// Set the palette of the image.
3af706cc	237	image->SetPalette(wxPalette(paletteLength, r, g, b));
6e3d5828	238	#endif // wxUSE_PALETTE
3af706cc VZ	239
	240	delete[] r;
	241	delete[] g;
	242	delete[] b;
	243	}
	244
	245	// Handle the various TGA formats we support.
	246
	247	switch (imageType)
	248	{
6e3d5828	249	#if wxUSE_PALETTE
3af706cc VZ	250	// Raw indexed.
	251
	252	case 1:
	253	{
	254	const wxPalette& palette = image->GetPalette();
	255	unsigned char r;
	256	unsigned char g;
	257	unsigned char b;
	258
	259	// No compression read the data directly to imageData.
	260
	261	stream.Read(imageData, imageSize);
	262
	263	// If orientation == 0, then the image is stored upside down.
	264	// We need to store it right side up.
	265
	266	if (orientation == 0)
	267	{
	268	FlipTGA(imageData, width, height, pixelSize);
	269	}
	270
	271	// Handle the different pixel depths.
	272
	273	switch (bpp)
	274	{
	275	// 8 bpp.
	276
	277	case 8:
	278	{
	279	for (unsigned long index = 0; index < imageSize; index += pixelSize)
	280	{
	281	palette.GetRGB(imageData[index], &r, &g, &b);
	282
	283	*(dst++) = r;
	284	*(dst++) = g;
	285	*(dst++) = b;
	286	}
	287	}
	288	break;
	289
	290	// 16 bpp.
	291
	292	case 16:
	293	{
	294	for (unsigned long index = 0; index < imageSize; index += pixelSize)
	295	{
	296	palette.GetRGB(imageData[index], &r, &g, &b);
	297
	298	*(dst++) = r;
	299	*(dst++) = g;
	300	*(dst++) = b;
	301	*(alpha++) = (imageData[index + 1] & 0x80) ? 0 : 255;
	302	}
	303	}
	304	break;
	305
	306	default:
	307	return wxTGA_INVFORMAT;
	308	}
	309	}
	310	break;
6e3d5828	311	#endif // wxUSE_PALETTE
3af706cc VZ	312
	313	// Raw RGB.
	314
	315	case 2:
	316	{
	317	// No compression read the data directly to imageData.
	318
	319	stream.Read(imageData, imageSize);
	320
	321	// If orientation == 0, then the image is stored upside down.
	322	// We need to store it right side up.
	323
	324	if (orientation == 0)
	325	{
	326	FlipTGA(imageData, width, height, pixelSize);
	327	}
	328
	329	// Handle the different pixel depths.
	330
	331	switch (bpp)
	332	{
	333	//16 bpp.
	334
	335	case 16:
	336	{
	337	unsigned char temp;
	338
	339	for (unsigned long index = 0; index < imageSize; index += pixelSize)
	340	{
	341	temp = (imageData[index + 1] & 0x7c) << 1;
	342	temp \|= temp >> 5;
	343	*(dst++) = temp;
	344
	345	temp = ((imageData[index + 1] & 0x03) << 6) \| ((imageData[index] & 0xe0) >> 2);
	346	temp \|= temp >> 5;
	347	*(dst++) = temp;
	348
	349	temp = (imageData[index] & 0x1f) << 3;
	350	temp \|= temp >> 5;
	351	*(dst++) = temp;
	352
	353	*(alpha++) = (imageData[index + 1] & 0x80) ? 0 : 255;
	354	}
	355	}
	356	break;
	357
	358	// 24 bpp.
	359
	360	case 24:
	361	{
	362	for (unsigned long index = 0; index < imageSize; index += pixelSize)
	363	{
	364	*(dst++) = imageData[index + 2];
	365	*(dst++) = imageData[index + 1];
	366	*(dst++) = imageData[index];
	367	}
	368	}
	369	break;
	370
	371	// 32 bpp.
	372
	373	case 32:
	374	{
	375	for (unsigned long index = 0; index < imageSize; index += pixelSize)
376	{
377	*(dst++) = imageData[index + 2];
378	*(dst++) = imageData[index + 1];
379	*(dst++) = imageData[index];
380	*(alpha++) = imageData[index + 3];
381	}
382	}
383	break;
384
385	default:
386	return wxTGA_INVFORMAT;
387	}
388	}
389	break;
390
391	// Raw grayscale.
392
393	case 3:
394	{
395	// No compression read the data directly to imageData.
396
397	stream.Read(imageData, imageSize);
398
399	// If orientation == 0, then the image is stored upside down.
400	// We need to store it right side up.
401
402	if (orientation == 0)
403	{
404	FlipTGA(imageData, width, height, pixelSize);
405	}
406
407	// Handle the different pixel depths.
408
409	switch (bpp)
410	{
411	// 8 bpp.
412
413	case 8:
414	{
415	for (unsigned long index = 0; index < imageSize; index += pixelSize)
416	{
417	*(dst++) = imageData[index];
418	*(dst++) = imageData[index];
419	*(dst++) = imageData[index];
420	}
421	}
422	break;
423
424	// 16 bpp.
425
426	case 16:
427	{
428	for (unsigned long index = 0; index < imageSize; index += pixelSize)
429	{
430	*(dst++) = imageData[index];
431	*(dst++) = imageData[index];
432	*(dst++) = imageData[index];
433	*(alpha++) = imageData[index + 1];
434	}
435	}
436	break;
437
438	default:
439	return wxTGA_INVFORMAT;
440	}
441	}
442	break;
443
6e3d5828	444	#if wxUSE_PALETTE
3af706cc VZ	445	// RLE indexed.
	446
	447	case 9:
	448	{
	449	const wxPalette& palette = image->GetPalette();
	450	unsigned char r;
	451	unsigned char g;
	452	unsigned char b;
	453
	454	// Decode the RLE data.
	455
8fee6306 VZ	456	int rc = DecodeRLE(imageData, imageSize, pixelSize, stream);
	457	if ( rc != wxTGA_OK )
	458	return rc;
3af706cc VZ	459
	460	// If orientation == 0, then the image is stored upside down.
	461	// We need to store it right side up.
	462
	463	if (orientation == 0)
	464	{
	465	FlipTGA(imageData, width, height, pixelSize);
	466	}
	467
	468	// Handle the different pixel depths.
	469
	470	switch (bpp)
	471	{
	472	// 8 bpp.
	473
	474	case 8:
	475	{
	476	for (unsigned long index = 0; index < imageSize; index += pixelSize)
	477	{
	478	palette.GetRGB(imageData[index], &r, &g, &b);
	479
	480	*(dst++) = r;
	481	*(dst++) = g;
	482	*(dst++) = b;
	483	}
	484	}
	485	break;
	486
	487	// 16 bpp.
	488
	489	case 16:
	490	{
	491	for (unsigned long index = 0; index < imageSize; index += pixelSize)
	492	{
	493	palette.GetRGB(imageData[index], &r, &g, &b);
	494
	495	*(dst++) = r;
	496	*(dst++) = g;
	497	*(dst++) = b;
	498	*(alpha++) = (imageData[index + 1] & 0x80) ? 0 : 255;
	499	}
	500	}
	501	break;
	502
	503	default:
	504	return wxTGA_INVFORMAT;
	505	}
	506	}
	507	break;
6e3d5828	508	#endif // wxUSE_PALETTE
3af706cc VZ	509
	510	// RLE RGB.
	511
	512	case 10:
	513	{
	514	// Decode the RLE data.
	515
8fee6306 VZ	516	int rc = DecodeRLE(imageData, imageSize, pixelSize, stream);
	517	if ( rc != wxTGA_OK )
	518	return rc;
3af706cc VZ	519
	520	// If orientation == 0, then the image is stored upside down.
	521	// We need to store it right side up.
	522
	523	if (orientation == 0)
	524	{
	525	FlipTGA(imageData, width, height, pixelSize);
	526	}
	527
	528	// Handle the different pixel depths.
	529
	530	switch (bpp)
	531	{
	532	//16 bpp.
	533
	534	case 16:
	535	{
	536	unsigned char temp;
	537
	538	for (unsigned long index = 0; index < imageSize; index += pixelSize)
	539	{
	540	temp = (imageData[index + 1] & 0x7c) << 1;
	541	temp \|= temp >> 5;
	542	*(dst++) = temp;
	543
	544	temp = ((imageData[index + 1] & 0x03) << 6) \| ((imageData[index] & 0xe0) >> 2);
	545	temp \|= temp >> 5;
	546	*(dst++) = temp;
	547
	548	temp = (imageData[index] & 0x1f) << 3;
	549	temp \|= temp >> 5;
	550	*(dst++) = temp;
	551
	552	*(alpha++) = (imageData[index + 1] & 0x80) ? 0 : 255;
	553	}
	554	}
	555	break;
	556
	557	// 24 bpp.
	558
	559	case 24:
	560	{
	561	for (unsigned long index = 0; index < imageSize; index += pixelSize)
	562	{
	563	*(dst++) = imageData[index + 2];
	564	*(dst++) = imageData[index + 1];
	565	*(dst++) = imageData[index];
	566	}
	567	}
	568	break;
	569
	570	// 32 bpp.
	571
	572	case 32:
	573	{
	574	for (unsigned long index = 0; index < imageSize; index += pixelSize)
	575	{
	576	*(dst++) = imageData[index + 2];
	577	*(dst++) = imageData[index + 1];
	578	*(dst++) = imageData[index];
	579	*(alpha++) = imageData[index + 3];
	580	}
	581	}
	582	break;
583
584	default:
585	return wxTGA_INVFORMAT;
586	}
587	}
588	break;
589
590	// RLE grayscale.
591
592	case 11:
593	{
594	// Decode the RLE data.
595
8fee6306 VZ	596	int rc = DecodeRLE(imageData, imageSize, pixelSize, stream);
	597	if ( rc != wxTGA_OK )
	598	return rc;
3af706cc VZ	599
	600	// If orientation == 0, then the image is stored upside down.
	601	// We need to store it right side up.
	602
	603	if (orientation == 0)
	604	{
	605	FlipTGA(imageData, width, height, pixelSize);
	606	}
	607
	608	// Handle the different pixel depths.
	609
	610	switch (bpp)
	611	{
	612	// 8 bpp.
	613
	614	case 8:
	615	{
	616	for (unsigned long index = 0; index < imageSize; index += pixelSize)
	617	{
	618	*(dst++) = imageData[index];
	619	*(dst++) = imageData[index];
	620	*(dst++) = imageData[index];
	621	}
	622	}
	623	break;
	624
	625	// 16 bpp.
	626
	627	case 16:
	628	{
	629	for (unsigned long index = 0; index < imageSize; index += pixelSize)
	630	{
	631	*(dst++) = imageData[index];
	632	*(dst++) = imageData[index];
	633	*(dst++) = imageData[index];
	634	*(alpha++) = imageData[index + 1];
	635	}
	636	}
	637	break;
	638
	639	default:
	640	return wxTGA_INVFORMAT;
	641	}
	642	}
	643	break;
	644
	645	default:
	646	return wxTGA_INVFORMAT;
	647	}
	648
3af706cc VZ	649	return wxTGA_OK;
	650	}
	651
	652	static
	653	int SaveTGA(wxImage* WXUNUSED(image), wxOutputStream& WXUNUSED(stream))
	654	{
	655	wxLogError(wxT("Saving in TGA format is not implemented."));
	656
	657	return wxTGA_OK;
	658	}
	659
	660	// ----------------------------------------------------------------------------
	661	// wxTGAHandler
	662	// ----------------------------------------------------------------------------
	663
	664	bool wxTGAHandler::LoadFile(wxImage* image,
	665	wxInputStream& stream,
	666	bool verbose,
	667	int WXUNUSED(index))
	668	{
	669	if ( !CanRead(stream) )
	670	{
	671	if ( verbose )
af588446	672	{
3af706cc	673	wxLogError(wxT("TGA: this is not a TGA file."));
af588446	674	}
3af706cc VZ	675
	676	return false;
	677	}
	678
	679	image->Destroy();
	680
	681	int error = ReadTGA(image, stream);
	682	if ( error != wxTGA_OK )
	683	{
	684	if ( verbose )
	685	{
	686	switch ( error )
	687	{
	688	case wxTGA_INVFORMAT:
	689	wxLogError(wxT("TGA: image format unsupported."));
	690	break;
	691
	692	case wxTGA_MEMERR:
	693	wxLogError(wxT("TGA: couldn't allocate memory."));
	694	break;
	695
8fee6306 VZ	696	case wxTGA_IOERR:
	697	wxLogError(wxT("TGA: couldn't read image data."));
	698	break;
	699
3af706cc VZ	700	default:
	701	wxLogError(wxT("TGA: unknown error!"));
	702	}
	703	}
	704
	705	image->Destroy();
	706
	707	return false;
	708	}
	709
	710	return true;
	711	}
	712
	713	bool wxTGAHandler::SaveFile(wxImage* image, wxOutputStream& stream, bool verbose)
	714	{
	715	int error = SaveTGA(image, stream);
	716
	717	if ( error != wxTGA_OK )
	718	{
	719	if ( verbose )
	720	{
	721	switch ( error )
	722	{
	723	case wxTGA_INVFORMAT:
	724	wxLogError(wxT("TGA: invalid image."));
	725	break;
	726
	727	case wxTGA_MEMERR:
	728	wxLogError(wxT("TGA: couldn't allocate memory."));
	729	break;
	730
	731	default:
	732	wxLogError(wxT("TGA: unknown error!"));
	733	}
	734	}
	735
	736	return false;
	737	}
	738
	739	return true;
	740	}
	741
	742	bool wxTGAHandler::DoCanRead(wxInputStream& stream)
	743	{
	744	// read the fixed-size TGA headers
	745	unsigned char hdr[HDR_SIZE];
8faef7cc	746	stream.Read(hdr, HDR_SIZE); // it's ok to modify the stream position here
3af706cc VZ	747
	748	// Check wether we can read the file or not.
	749
	750	short colorType = hdr[HDR_COLORTYPE];
	751	if ( colorType != wxTGA_UNMAPPED && colorType != wxTGA_MAPPED )
	752	{
	753	return false;
	754	}
	755
	756	short imageType = hdr[HDR_IMAGETYPE];
	757	if ( imageType == 0 \|\| imageType == 32 \|\| imageType == 33 )
	758	{
	759	return false;
	760	}
	761
	762	short bpp = hdr[HDR_BPP];
	763	if ( bpp != 8 && bpp != 16 && bpp != 24 && bpp != 32 )
	764	{
	765	return false;
	766	}
	767
	768	return true;
	769	}
	770
	771	#endif // wxUSE_STREAMS
	772
	773	#endif // wxUSE_IMAGE && wxUSE_TGA