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src/Source/FreeImage/PluginICO.cpp  view on Meta::CPAN

#pragma pack()
#endif

// ==========================================================
// Static helpers
// ==========================================================

/**  How wide, in bytes, would this many bits be, DWORD aligned ?
*/
static int 
WidthBytes(int bits) {
	return ((((bits) + 31)>>5)<<2);
}

/** Calculates the size of a single icon image
@return Returns the size for that image
*/
static DWORD 
CalculateImageSize(FIBITMAP* icon_dib) {
	DWORD dwNumBytes = 0;

	unsigned colors		= FreeImage_GetColorsUsed(icon_dib);
	unsigned width		= FreeImage_GetWidth(icon_dib);
	unsigned height		= FreeImage_GetHeight(icon_dib);
	unsigned pitch		= FreeImage_GetPitch(icon_dib);

	dwNumBytes = sizeof( BITMAPINFOHEADER );	// header
	dwNumBytes += colors * sizeof(RGBQUAD);		// palette
	dwNumBytes += height * pitch;				// XOR mask
	dwNumBytes += height * WidthBytes(width);	// AND mask

	return dwNumBytes;
}

/** Calculates the file offset for an icon image
@return Returns the file offset for that image
*/
static DWORD 
CalculateImageOffset(std::vector<FIBITMAP*>& vPages, int nIndex ) {
	DWORD	dwSize;

    // calculate the ICO header size
    dwSize = sizeof(ICONHEADER); 
    // add the ICONDIRENTRY's
    dwSize += (DWORD)( vPages.size() * sizeof(ICONDIRENTRY) );
    // add the sizes of the previous images
    for(int k = 0; k < nIndex; k++) {
		FIBITMAP *icon_dib = (FIBITMAP*)vPages[k];
		dwSize += CalculateImageSize(icon_dib);
	}

    return dwSize;
}

/**
Vista icon support
@return Returns TRUE if the bitmap data is stored in PNG format
*/
static BOOL
IsPNG(FreeImageIO *io, fi_handle handle) {
	BYTE png_signature[8] = { 137, 80, 78, 71, 13, 10, 26, 10 };
	BYTE signature[8] = { 0, 0, 0, 0, 0, 0, 0, 0 };

	long tell = io->tell_proc(handle);
	io->read_proc(&signature, 1, 8, handle);
	BOOL bIsPNG = (memcmp(png_signature, signature, 8) == 0);
	io->seek_proc(handle, tell, SEEK_SET);

	return bIsPNG;
}

#ifdef FREEIMAGE_BIGENDIAN
static void
SwapInfoHeader(BITMAPINFOHEADER *header) {
	SwapLong(&header->biSize);
	SwapLong((DWORD *)&header->biWidth);
	SwapLong((DWORD *)&header->biHeight);
	SwapShort(&header->biPlanes);
	SwapShort(&header->biBitCount);
	SwapLong(&header->biCompression);
	SwapLong(&header->biSizeImage);
	SwapLong((DWORD *)&header->biXPelsPerMeter);
	SwapLong((DWORD *)&header->biYPelsPerMeter);
	SwapLong(&header->biClrUsed);
	SwapLong(&header->biClrImportant);
}

static void
SwapIconHeader(ICONHEADER *header) {
	SwapShort(&header->idReserved);
	SwapShort(&header->idType);
	SwapShort(&header->idCount);
}

static void
SwapIconDirEntries(ICONDIRENTRY *ent, int num) {
	while(num) {
		SwapShort(&ent->wPlanes);
		SwapShort(&ent->wBitCount);
		SwapLong(&ent->dwBytesInRes);
		SwapLong(&ent->dwImageOffset);
		num--;
		ent++;
	}
}
#endif

// ==========================================================
// Plugin Interface
// ==========================================================

static int s_format_id;

// ==========================================================
// Plugin Implementation
// ==========================================================

static const char * DLL_CALLCONV
Format() {
	return "ICO";
}

static const char * DLL_CALLCONV
Description() {
	return "Windows Icon";
}