/*
 * Copyright (C) 2009-2010 Tony Wasserka
 *
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 2.1 of the License, or (at your option) any later version.
 *
 * This library is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with this library; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA
 *
 */

#include "wine/debug.h"
#include "wine/unicode.h"
#include "d3dx9_36_private.h"

#include "initguid.h"
#include "wincodec.h"

WINE_DEFAULT_DEBUG_CHANNEL(d3dx);


/* Wine-specific WIC GUIDs */

DEFINE_GUID(GUID_WineContainerFormatTga, 0x0c44fda1,0xa5c5,0x4298,0x96,0x85,0x47,0x3f,0xc1,0x7c,0xd3,0x22);

/************************************************************
 * D3DXGetImageInfoFromFileInMemory
 *
 * Fills a D3DXIMAGE_INFO structure with info about an image
 *
 * PARAMS
 *   data     [I] pointer to the image file data
 *   datasize [I] size of the passed data
 *   info     [O] pointer to the destination structure
 *
 * RETURNS
 *   Success: D3D_OK, if info is not NULL and data and datasize make up a valid image file or
 *                    if info is NULL and data and datasize are not NULL
 *   Failure: D3DXERR_INVALIDDATA, if data is no valid image file and datasize and info are not NULL
 *            D3DERR_INVALIDCALL, if data is NULL or
 *                                if datasize is 0
 *
 * NOTES
 *   datasize may be bigger than the actual file size
 *
 */
HRESULT WINAPI D3DXGetImageInfoFromFileInMemory(LPCVOID data, UINT datasize, D3DXIMAGE_INFO *info)
{
    IWICImagingFactory *factory;
    IWICBitmapDecoder *decoder = NULL;
    IWICStream *stream;
    HRESULT hr;
    HRESULT initresult;
    static int warn_once;

    if (!warn_once++)
        FIXME("(%p, %d, %p): partially implemented\n", data, datasize, info);

    /* TODO: Add support for (or at least detect) TGA, DDS, PPM and DIB */

    if (!data || !datasize)
        return D3DERR_INVALIDCALL;

    if (!info)
        return D3D_OK;

    initresult = CoInitializeEx(NULL, COINIT_APARTMENTTHREADED);

    hr = CoCreateInstance(&CLSID_WICImagingFactory, NULL, CLSCTX_INPROC_SERVER, &IID_IWICImagingFactory, (void**)&factory);

    if (SUCCEEDED(hr)) {
        IWICImagingFactory_CreateStream(factory, &stream);
        IWICStream_InitializeFromMemory(stream, (BYTE*)data, datasize);
        hr = IWICImagingFactory_CreateDecoderFromStream(factory, (IStream*)stream, NULL, 0, &decoder);
        IStream_Release(stream);
        IWICImagingFactory_Release(factory);
    }

    if (SUCCEEDED(hr)) {
        GUID container_format;
        UINT frame_count;

        hr = IWICBitmapDecoder_GetContainerFormat(decoder, &container_format);
        if (SUCCEEDED(hr)) {
            if (IsEqualGUID(&container_format, &GUID_ContainerFormatBmp)) {
                TRACE("File type is BMP\n");
                info->ImageFileFormat = D3DXIFF_BMP;
            } else if (IsEqualGUID(&container_format, &GUID_ContainerFormatPng)) {
                TRACE("File type is PNG\n");
                info->ImageFileFormat = D3DXIFF_PNG;
            } else if(IsEqualGUID(&container_format, &GUID_ContainerFormatJpeg)) {
                TRACE("File type is JPG\n");
                info->ImageFileFormat = D3DXIFF_JPG;
            } else if(IsEqualGUID(&container_format, &GUID_WineContainerFormatTga)) {
                TRACE("File type is TGA\n");
                info->ImageFileFormat = D3DXIFF_TGA;
            } else {
                WARN("Unsupported image file format %s\n", debugstr_guid(&container_format));
                hr = D3DXERR_INVALIDDATA;
            }
        }

        if (SUCCEEDED(hr))
            hr = IWICBitmapDecoder_GetFrameCount(decoder, &frame_count);
        if (SUCCEEDED(hr) && !frame_count)
            hr = D3DXERR_INVALIDDATA;

        if (SUCCEEDED(hr)) {
            IWICBitmapFrameDecode *frame = NULL;

            hr = IWICBitmapDecoder_GetFrame(decoder, 0, &frame);

            if (SUCCEEDED(hr))
                hr = IWICBitmapFrameDecode_GetSize(frame, &info->Width, &info->Height);

            if (SUCCEEDED(hr)) {
                WICPixelFormatGUID pixel_format;

                hr = IWICBitmapFrameDecode_GetPixelFormat(frame, &pixel_format);
                if (SUCCEEDED(hr)) {
                    if (IsEqualGUID(&pixel_format, &GUID_WICPixelFormat1bppIndexed))
                        info->Format = D3DFMT_L8;
                    else if (IsEqualGUID(&pixel_format, &GUID_WICPixelFormat4bppIndexed))
                        info->Format = D3DFMT_L8;
                    else if (IsEqualGUID(&pixel_format, &GUID_WICPixelFormat8bppIndexed))
                        info->Format = D3DFMT_L8;
                    else if (IsEqualGUID(&pixel_format, &GUID_WICPixelFormat16bppBGR555))
                        info->Format = D3DFMT_X1R5G5B5;
                    else if (IsEqualGUID(&pixel_format, &GUID_WICPixelFormat24bppBGR))
                        info->Format = D3DFMT_R8G8B8;
                    else if (IsEqualGUID(&pixel_format, &GUID_WICPixelFormat32bppBGR))
                        info->Format = D3DFMT_X8R8G8B8;
                    else if (IsEqualGUID(&pixel_format, &GUID_WICPixelFormat32bppBGRA))
                        info->Format = D3DFMT_A8R8G8B8;
                    else {
                        WARN("Unsupported pixel format %s\n", debugstr_guid(&pixel_format));
                        hr = D3DXERR_INVALIDDATA;
                    }
                }
            }

            if (frame)
                 IWICBitmapFrameDecode_Release(frame);

            info->Depth = 1;
            info->MipLevels = 1;
            info->ResourceType = D3DRTYPE_TEXTURE;
        }
    }

    if (decoder)
        IWICBitmapDecoder_Release(decoder);

    if (SUCCEEDED(initresult))
        CoUninitialize();

    if (FAILED(hr)) {
        /* Missing formats are not detected yet and will fail silently without the FIXME */
        FIXME("Invalid or unsupported image file\n");
        return D3DXERR_INVALIDDATA;
    }

    return D3D_OK;
}

/************************************************************
 * D3DXGetImageInfoFromFile
 *
 * RETURNS
 *   Success: D3D_OK, if we successfully load a valid image file or
 *                    if we successfully load a file which is no valid image and info is NULL
 *   Failure: D3DXERR_INVALIDDATA, if we fail to load file or
 *                                 if file is not a valid image file and info is not NULL
 *            D3DERR_INVALIDCALL, if file is NULL
 *
 */
HRESULT WINAPI D3DXGetImageInfoFromFileA(LPCSTR file, D3DXIMAGE_INFO *info)
{
    LPWSTR widename;
    HRESULT hr;
    int strlength;

    TRACE("(%s, %p): relay\n", debugstr_a(file), info);

    if( !file ) return D3DERR_INVALIDCALL;

    strlength = MultiByteToWideChar(CP_ACP, 0, file, -1, NULL, 0);
    widename = HeapAlloc(GetProcessHeap(), HEAP_ZERO_MEMORY, strlength * sizeof(WCHAR));
    MultiByteToWideChar(CP_ACP, 0, file, -1, widename, strlength);

    hr = D3DXGetImageInfoFromFileW(widename, info);
    HeapFree(GetProcessHeap(), 0, widename);

    return hr;
}

HRESULT WINAPI D3DXGetImageInfoFromFileW(LPCWSTR file, D3DXIMAGE_INFO *info)
{
    HRESULT hr;
    DWORD size;
    LPVOID buffer;

    TRACE("(%s, %p): relay\n", debugstr_w(file), info);

    if( !file ) return D3DERR_INVALIDCALL;

    hr = map_view_of_file(file, &buffer, &size);
    if(FAILED(hr)) return D3DXERR_INVALIDDATA;

    hr = D3DXGetImageInfoFromFileInMemory(buffer, size, info);
    UnmapViewOfFile(buffer);

    return hr;
}

/************************************************************
 * D3DXGetImageInfoFromResource
 *
 * RETURNS
 *   Success: D3D_OK, if resource is a valid image file
 *   Failure: D3DXERR_INVALIDDATA, if resource is no valid image file or NULL or
 *                                 if we fail to load resource
 *
 */
HRESULT WINAPI D3DXGetImageInfoFromResourceA(HMODULE module, LPCSTR resource, D3DXIMAGE_INFO *info)
{
    HRSRC resinfo;

    TRACE("(%p, %s, %p)\n", module, debugstr_a(resource), info);

    resinfo = FindResourceA(module, resource, (LPCSTR)RT_RCDATA);
    if(resinfo) {
        LPVOID buffer;
        HRESULT hr;
        DWORD size;

        hr = load_resource_into_memory(module, resinfo, &buffer, &size);
        if(FAILED(hr)) return D3DXERR_INVALIDDATA;
        return D3DXGetImageInfoFromFileInMemory(buffer, size, info);
    }

    resinfo = FindResourceA(module, resource, (LPCSTR)RT_BITMAP);
    if(resinfo) {
        FIXME("Implement loading bitmaps from resource type RT_BITMAP\n");
        return E_NOTIMPL;
    }
    return D3DXERR_INVALIDDATA;
}

HRESULT WINAPI D3DXGetImageInfoFromResourceW(HMODULE module, LPCWSTR resource, D3DXIMAGE_INFO *info)
{
    HRSRC resinfo;

    TRACE("(%p, %s, %p)\n", module, debugstr_w(resource), info);

    resinfo = FindResourceW(module, resource, (LPCWSTR)RT_RCDATA);
    if(resinfo) {
        LPVOID buffer;
        HRESULT hr;
        DWORD size;

        hr = load_resource_into_memory(module, resinfo, &buffer, &size);
        if(FAILED(hr)) return D3DXERR_INVALIDDATA;
        return D3DXGetImageInfoFromFileInMemory(buffer, size, info);
    }

    resinfo = FindResourceW(module, resource, (LPCWSTR)RT_BITMAP);
    if(resinfo) {
        FIXME("Implement loading bitmaps from resource type RT_BITMAP\n");
        return E_NOTIMPL;
    }
    return D3DXERR_INVALIDDATA;
}

/************************************************************
 * D3DXLoadSurfaceFromFileInMemory
 *
 * Loads data from a given buffer into a surface and fills a given
 * D3DXIMAGE_INFO structure with info about the source data.
 *
 * PARAMS
 *   pDestSurface [I] pointer to the surface
 *   pDestPalette [I] palette to use
 *   pDestRect    [I] to be filled area of the surface
 *   pSrcData     [I] pointer to the source data
 *   SrcDataSize  [I] size of the source data in bytes
 *   pSrcRect     [I] area of the source data to load
 *   dwFilter     [I] filter to apply on stretching
 *   Colorkey     [I] colorkey
 *   pSrcInfo     [O] pointer to a D3DXIMAGE_INFO structure
 *
 * RETURNS
 *   Success: D3D_OK
 *   Failure: D3DERR_INVALIDCALL, if pDestSurface or pSrcData or SrcDataSize are NULL
 *            D3DXERR_INVALIDDATA, if pSrcData is no valid image file
 *
 */
HRESULT WINAPI D3DXLoadSurfaceFromFileInMemory(LPDIRECT3DSURFACE9 pDestSurface,
                                               CONST PALETTEENTRY *pDestPalette,
                                               CONST RECT *pDestRect,
                                               LPCVOID pSrcData,
                                               UINT SrcDataSize,
                                               CONST RECT *pSrcRect,
                                               DWORD dwFilter,
                                               D3DCOLOR Colorkey,
                                               D3DXIMAGE_INFO *pSrcInfo)
{
    D3DXIMAGE_INFO imginfo;
    HRESULT hr;

    IWICImagingFactory *factory;
    IWICBitmapDecoder *decoder;
    IWICBitmapFrameDecode *bitmapframe;
    IWICStream *stream;

    const PixelFormatDesc *formatdesc;
    WICRect wicrect;
    RECT rect;

    TRACE("(%p, %p, %p, %p, %d, %p, %d, %x, %p)\n", pDestSurface, pDestPalette, pDestRect, pSrcData,
        SrcDataSize, pSrcRect, dwFilter, Colorkey, pSrcInfo);

    if (!pDestSurface || !pSrcData | !SrcDataSize)
        return D3DERR_INVALIDCALL;

    hr = D3DXGetImageInfoFromFileInMemory(pSrcData, SrcDataSize, &imginfo);

    if (FAILED(hr))
        return hr;

    CoInitializeEx(NULL, COINIT_APARTMENTTHREADED);

    if (FAILED(CoCreateInstance(&CLSID_WICImagingFactory, NULL, CLSCTX_INPROC_SERVER, &IID_IWICImagingFactory, (void**)&factory)))
        goto cleanup_err;

    if (FAILED(IWICImagingFactory_CreateStream(factory, &stream)))
    {
        IWICImagingFactory_Release(factory);
        goto cleanup_err;
    }

    IWICStream_InitializeFromMemory(stream, (BYTE*)pSrcData, SrcDataSize);

    hr = IWICImagingFactory_CreateDecoderFromStream(factory, (IStream*)stream, NULL, 0, &decoder);

    IStream_Release(stream);
    IWICImagingFactory_Release(factory);

    if (FAILED(hr))
        goto cleanup_err;

    hr = IWICBitmapDecoder_GetFrame(decoder, 0, &bitmapframe);

    if (FAILED(hr))
        goto cleanup_bmp;

    if (pSrcRect)
    {
        wicrect.X = pSrcRect->left;
        wicrect.Y = pSrcRect->top;
        wicrect.Width = pSrcRect->right - pSrcRect->left;
        wicrect.Height = pSrcRect->bottom - pSrcRect->top;
    }
    else
    {
        wicrect.X = 0;
        wicrect.Y = 0;
        wicrect.Width = imginfo.Width;
        wicrect.Height = imginfo.Height;
    }

    SetRect(&rect, 0, 0, wicrect.Width, wicrect.Height);

    formatdesc = get_format_info(imginfo.Format);

    if (formatdesc->format == D3DFMT_UNKNOWN)
    {
        FIXME("Unsupported pixel format\n");
        hr = D3DXERR_INVALIDDATA;
    }
    else
    {
        BYTE *buffer;
        DWORD pitch;

        pitch = formatdesc->bytes_per_pixel * wicrect.Width;
        buffer = HeapAlloc(GetProcessHeap(), 0, pitch * wicrect.Height);

        hr = IWICBitmapFrameDecode_CopyPixels(bitmapframe, &wicrect, pitch,
                                              pitch * wicrect.Height, buffer);

        if (SUCCEEDED(hr))
        {
            hr = D3DXLoadSurfaceFromMemory(pDestSurface, pDestPalette, pDestRect,
                                           buffer, imginfo.Format, pitch,
                                           NULL, &rect, dwFilter, Colorkey);
        }

        HeapFree(GetProcessHeap(), 0, buffer);
    }

    IWICBitmapFrameDecode_Release(bitmapframe);

cleanup_bmp:
    IWICBitmapDecoder_Release(decoder);

cleanup_err:
    CoUninitialize();

    if (FAILED(hr))
        return D3DXERR_INVALIDDATA;

    if (pSrcInfo)
        *pSrcInfo = imginfo;

    return D3D_OK;
}

/************************************************************
 * D3DXLoadSurfaceFromFile
 */
HRESULT WINAPI D3DXLoadSurfaceFromFileA(LPDIRECT3DSURFACE9 pDestSurface,
                                        CONST PALETTEENTRY *pDestPalette,
                                        CONST RECT *pDestRect,
                                        LPCSTR pSrcFile,
                                        CONST RECT *pSrcRect,
                                        DWORD dwFilter,
                                        D3DCOLOR Colorkey,
                                        D3DXIMAGE_INFO *pSrcInfo)
{
    LPWSTR pWidename;
    HRESULT hr;
    int strlength;

    TRACE("(%p, %p, %p, %s, %p, %u, %#x, %p): relay\n", pDestSurface, pDestPalette, pDestRect, debugstr_a(pSrcFile),
        pSrcRect, dwFilter, Colorkey, pSrcInfo);

    if( !pSrcFile || !pDestSurface ) return D3DERR_INVALIDCALL;

    strlength = MultiByteToWideChar(CP_ACP, 0, pSrcFile, -1, NULL, 0);
    pWidename = HeapAlloc(GetProcessHeap(), HEAP_ZERO_MEMORY, strlength * sizeof(WCHAR));
    MultiByteToWideChar(CP_ACP, 0, pSrcFile, -1, pWidename, strlength);

    hr = D3DXLoadSurfaceFromFileW(pDestSurface, pDestPalette, pDestRect, pWidename, pSrcRect, dwFilter, Colorkey, pSrcInfo);
    HeapFree(GetProcessHeap(), 0, pWidename);

    return hr;
}

HRESULT WINAPI D3DXLoadSurfaceFromFileW(LPDIRECT3DSURFACE9 pDestSurface,
                                        CONST PALETTEENTRY *pDestPalette,
                                        CONST RECT *pDestRect,
                                        LPCWSTR pSrcFile,
                                        CONST RECT *pSrcRect,
                                        DWORD Filter,
                                        D3DCOLOR Colorkey,
                                        D3DXIMAGE_INFO *pSrcInfo)
{
    HRESULT hr;
    DWORD dwSize;
    LPVOID pBuffer;

    TRACE("(%p, %p, %p, %s, %p, %u, %#x, %p): relay\n", pDestSurface, pDestPalette, pDestRect, debugstr_w(pSrcFile),
        pSrcRect, Filter, Colorkey, pSrcInfo);

    if( !pSrcFile || !pDestSurface ) return D3DERR_INVALIDCALL;

    hr = map_view_of_file(pSrcFile, &pBuffer, &dwSize);
    if(FAILED(hr)) return D3DXERR_INVALIDDATA;

    hr = D3DXLoadSurfaceFromFileInMemory(pDestSurface, pDestPalette, pDestRect, pBuffer, dwSize, pSrcRect, Filter, Colorkey, pSrcInfo);
    UnmapViewOfFile(pBuffer);

    return hr;
}

/************************************************************
 * D3DXLoadSurfaceFromResource
 */
HRESULT WINAPI D3DXLoadSurfaceFromResourceA(LPDIRECT3DSURFACE9 pDestSurface,
                                            CONST PALETTEENTRY *pDestPalette,
                                            CONST RECT *pDestRect,
                                            HMODULE hSrcModule,
                                            LPCSTR pResource,
                                            CONST RECT *pSrcRect,
                                            DWORD dwFilter,
                                            D3DCOLOR Colorkey,
                                            D3DXIMAGE_INFO *pSrcInfo)
{
    HRSRC hResInfo;

    TRACE("(%p, %p, %p, %p, %s, %p, %u, %#x, %p): relay\n", pDestSurface, pDestPalette, pDestRect, hSrcModule,
        debugstr_a(pResource), pSrcRect, dwFilter, Colorkey, pSrcInfo);

    if( !pDestSurface ) return D3DERR_INVALIDCALL;

    hResInfo = FindResourceA(hSrcModule, pResource, (LPCSTR)RT_RCDATA);
    if(hResInfo) {
        LPVOID pBuffer;
        HRESULT hr;
        DWORD dwSize;

        hr = load_resource_into_memory(hSrcModule, hResInfo, &pBuffer, &dwSize);
        if(FAILED(hr)) return D3DXERR_INVALIDDATA;
        return D3DXLoadSurfaceFromFileInMemory(pDestSurface, pDestPalette, pDestRect, pBuffer, dwSize, pSrcRect, dwFilter, Colorkey, pSrcInfo);
    }

    hResInfo = FindResourceA(hSrcModule, pResource, (LPCSTR)RT_BITMAP);
    if(hResInfo) {
        FIXME("Implement loading bitmaps from resource type RT_BITMAP\n");
        return E_NOTIMPL;
    }
    return D3DXERR_INVALIDDATA;
}

HRESULT WINAPI D3DXLoadSurfaceFromResourceW(LPDIRECT3DSURFACE9 pDestSurface,
                                            CONST PALETTEENTRY *pDestPalette,
                                            CONST RECT *pDestRect,
                                            HMODULE hSrcModule,
                                            LPCWSTR pResource,
                                            CONST RECT *pSrcRect,
                                            DWORD dwFilter,
                                            D3DCOLOR Colorkey,
                                            D3DXIMAGE_INFO *pSrcInfo)
{
    HRSRC hResInfo;

    TRACE("(%p, %p, %p, %p, %s, %p, %u, %#x, %p): relay\n", pDestSurface, pDestPalette, pDestRect, hSrcModule,
        debugstr_w(pResource), pSrcRect, dwFilter, Colorkey, pSrcInfo);

    if( !pDestSurface ) return D3DERR_INVALIDCALL;

    hResInfo = FindResourceW(hSrcModule, pResource, (LPCWSTR)RT_RCDATA);
    if(hResInfo) {
        LPVOID pBuffer;
        HRESULT hr;
        DWORD dwSize;

        hr = load_resource_into_memory(hSrcModule, hResInfo, &pBuffer, &dwSize);
        if(FAILED(hr)) return D3DXERR_INVALIDDATA;
        return D3DXLoadSurfaceFromFileInMemory(pDestSurface, pDestPalette, pDestRect, pBuffer, dwSize, pSrcRect, dwFilter, Colorkey, pSrcInfo);
    }

    hResInfo = FindResourceW(hSrcModule, pResource, (LPCWSTR)RT_BITMAP);
    if(hResInfo) {
        FIXME("Implement loading bitmaps from resource type RT_BITMAP\n");
        return E_NOTIMPL;
    }
    return D3DXERR_INVALIDDATA;
}


/************************************************************
 * helper functions for D3DXLoadSurfaceFromMemory
 */
struct argb_conversion_info
{
    CONST PixelFormatDesc *srcformat;
    CONST PixelFormatDesc *destformat;
    DWORD srcshift[4], destshift[4];
    DWORD srcmask[4], destmask[4];
    BOOL process_channel[4];
    DWORD channelmask;
};

static void init_argb_conversion_info(CONST PixelFormatDesc *srcformat, CONST PixelFormatDesc *destformat, struct argb_conversion_info *info)
{
    UINT i;
    ZeroMemory(info->process_channel, 4 * sizeof(BOOL));
    info->channelmask = 0;

    info->srcformat  =  srcformat;
    info->destformat = destformat;

    for(i = 0;i < 4;i++) {
        /* srcshift is used to extract the _relevant_ components */
        info->srcshift[i]  =  srcformat->shift[i] + max( srcformat->bits[i] - destformat->bits[i], 0);

        /* destshift is used to move the components to the correct position */
        info->destshift[i] = destformat->shift[i] + max(destformat->bits[i] -  srcformat->bits[i], 0);

        info->srcmask[i]  = ((1 <<  srcformat->bits[i]) - 1) <<  srcformat->shift[i];
        info->destmask[i] = ((1 << destformat->bits[i]) - 1) << destformat->shift[i];

        /* channelmask specifies bits which aren't used in the source format but in the destination one */
        if(destformat->bits[i]) {
            if(srcformat->bits[i]) info->process_channel[i] = TRUE;
            else info->channelmask |= info->destmask[i];
        }
    }
}

static DWORD dword_from_bytes(CONST BYTE *src, UINT bytes_per_pixel)
{
    DWORD ret = 0;
    static BOOL fixme_once;

    if(bytes_per_pixel > sizeof(DWORD)) {
        if(!fixme_once++) FIXME("Unsupported image: %u bytes per pixel\n", bytes_per_pixel);
        bytes_per_pixel = sizeof(DWORD);
    }

    memcpy(&ret, src, bytes_per_pixel);
    return ret;
}

static void dword_to_bytes(BYTE *dst, DWORD dword, UINT bytes_per_pixel)
{
    static BOOL fixme_once;

    if(bytes_per_pixel > sizeof(DWORD)) {
        if(!fixme_once++) FIXME("Unsupported image: %u bytes per pixel\n", bytes_per_pixel);
        ZeroMemory(dst, bytes_per_pixel);
        bytes_per_pixel = sizeof(DWORD);
    }

    memcpy(dst, &dword, bytes_per_pixel);
}

/************************************************************
 * get_relevant_argb_components
 *
 * Extracts the relevant components from the source color and
 * drops the less significant bits if they aren't used by the destination format.
 */
static void get_relevant_argb_components(CONST struct argb_conversion_info *info, CONST DWORD col, DWORD *out)
{
    UINT i = 0;
    for(;i < 4;i++)
        if(info->process_channel[i])
            out[i] = (col & info->srcmask[i]) >> info->srcshift[i];
}

/************************************************************
 * make_argb_color
 *
 * Recombines the output of get_relevant_argb_components and converts
 * it to the destination format.
 */
static DWORD make_argb_color(CONST struct argb_conversion_info *info, CONST DWORD *in)
{
    UINT i;
    DWORD val = 0;

    for(i = 0;i < 4;i++) {
        if(info->process_channel[i]) {
            /* necessary to make sure that e.g. an X4R4G4B4 white maps to an R8G8B8 white instead of 0xf0f0f0 */
            signed int shift;
            for(shift = info->destshift[i]; shift > info->destformat->shift[i]; shift -= info->srcformat->bits[i]) val |= in[i] << shift;
            val |= (in[i] >> (info->destformat->shift[i] - shift)) << info->destformat->shift[i];
        }
    }
    val |= info->channelmask;   /* new channels are set to their maximal value */
    return val;
}

/************************************************************
 * copy_simple_data
 *
 * Copies the source buffer to the destination buffer, performing
 * any necessary format conversion and color keying.
 * Pixels outsize the source rect are blacked out.
 * Works only for ARGB formats with 1 - 4 bytes per pixel.
 */
static void copy_simple_data(CONST BYTE *src, UINT srcpitch, POINT srcsize,
                             CONST PixelFormatDesc *srcformat,
                             BYTE *dest, UINT destpitch, POINT destsize,
                             CONST PixelFormatDesc *destformat,
                             D3DCOLOR colorkey)
{
    struct argb_conversion_info conv_info, ck_conv_info;
    DWORD channels[4], pixel;
    UINT minwidth, minheight;
    UINT x, y;

    ZeroMemory(channels, sizeof(channels));
    init_argb_conversion_info(srcformat, destformat, &conv_info);

    minwidth  = (srcsize.x < destsize.x) ? srcsize.x : destsize.x;
    minheight = (srcsize.y < destsize.y) ? srcsize.y : destsize.y;

    if(colorkey) {
        /* color keys are always represented in D3DFMT_A8R8G8B8 format */
        const PixelFormatDesc *ckformatdesc;

        ckformatdesc = get_format_info(D3DFMT_A8R8G8B8);
        init_argb_conversion_info(srcformat, ckformatdesc, &ck_conv_info);
    }

    for(y = 0;y < minheight;y++) {
        const BYTE *srcptr = src + y * srcpitch;
        BYTE *destptr = dest + y * destpitch;
        DWORD val = 0;

        for(x = 0;x < minwidth;x++) {
            /* extract source color components */
            pixel = dword_from_bytes(srcptr, srcformat->bytes_per_pixel);
            get_relevant_argb_components(&conv_info, pixel, channels);

            /* recombine the components */
            val = make_argb_color(&conv_info, channels);

            if(colorkey) {
                get_relevant_argb_components(&ck_conv_info, pixel, channels);
                pixel = make_argb_color(&ck_conv_info, channels);
                if(pixel == colorkey)
                    /* make this pixel transparent */
                    val &= ~conv_info.destmask[0];
            }

            dword_to_bytes(destptr, val, destformat->bytes_per_pixel);
            srcptr  +=  srcformat->bytes_per_pixel;
            destptr += destformat->bytes_per_pixel;
        }

        if(srcsize.x < destsize.x) /* black out remaining pixels */
            ZeroMemory(destptr, destformat->bytes_per_pixel * (destsize.x - srcsize.x));
    }
    if(srcsize.y < destsize.y) /* black out remaining pixels */
        ZeroMemory(dest + srcsize.y * destpitch, destpitch * (destsize.y - srcsize.y));
}

/************************************************************
 * point_filter_simple_data
 *
 * Copies the source buffer to the destination buffer, performing
 * any necessary format conversion, color keying and stretching
 * using a point filter.
 * Works only for ARGB formats with 1 - 4 bytes per pixel.
 */
static void point_filter_simple_data(CONST BYTE *src, UINT srcpitch, POINT srcsize,
                                     CONST PixelFormatDesc *srcformat,
                                     BYTE *dest, UINT destpitch, POINT destsize,
                                     CONST PixelFormatDesc *destformat,
                                     D3DCOLOR colorkey)
{
    struct argb_conversion_info conv_info, ck_conv_info;
    DWORD channels[4], pixel;

    UINT x, y;

    ZeroMemory(channels, sizeof(channels));
    init_argb_conversion_info(srcformat, destformat, &conv_info);

    if(colorkey) {
        /* color keys are always represented in D3DFMT_A8R8G8B8 format */
        const PixelFormatDesc *ckformatdesc;

        ckformatdesc = get_format_info(D3DFMT_A8R8G8B8);
        init_argb_conversion_info(srcformat, ckformatdesc, &ck_conv_info);
    }

    for(y = 0;y < destsize.y;y++) {
        BYTE *destptr = dest + y * destpitch;
        const BYTE *bufptr = src + srcpitch * (y * srcsize.y / destsize.y);

        for(x = 0;x < destsize.x;x++) {
            const BYTE *srcptr = bufptr + (x * srcsize.x / destsize.x) * srcformat->bytes_per_pixel;
            DWORD val = 0;

            /* extract source color components */
            pixel = dword_from_bytes(srcptr, srcformat->bytes_per_pixel);
            get_relevant_argb_components(&conv_info, pixel, channels);

            /* recombine the components */
            val = make_argb_color(&conv_info, channels);

            if(colorkey) {
                get_relevant_argb_components(&ck_conv_info, pixel, channels);
                pixel = make_argb_color(&ck_conv_info, channels);
                if(pixel == colorkey)
                    /* make this pixel transparent */
                    val &= ~conv_info.destmask[0];
            }

            dword_to_bytes(destptr, val, destformat->bytes_per_pixel);
            destptr += destformat->bytes_per_pixel;
        }
    }
}

/************************************************************
 * D3DXLoadSurfaceFromMemory
 *
 * Loads data from a given memory chunk into a surface,
 * applying any of the specified filters.
 *
 * PARAMS
 *   pDestSurface [I] pointer to the surface
 *   pDestPalette [I] palette to use
 *   pDestRect    [I] to be filled area of the surface
 *   pSrcMemory   [I] pointer to the source data
 *   SrcFormat    [I] format of the source pixel data
 *   SrcPitch     [I] number of bytes in a row
 *   pSrcPalette  [I] palette used in the source image
 *   pSrcRect     [I] area of the source data to load
 *   dwFilter     [I] filter to apply on stretching
 *   Colorkey     [I] colorkey
 *
 * RETURNS
 *   Success: D3D_OK, if we successfully load the pixel data into our surface or
 *                    if pSrcMemory is NULL but the other parameters are valid
 *   Failure: D3DERR_INVALIDCALL, if pDestSurface, SrcPitch or pSrcRect are NULL or
 *                                if SrcFormat is an invalid format (other than D3DFMT_UNKNOWN) or
 *                                if DestRect is invalid
 *            D3DXERR_INVALIDDATA, if we fail to lock pDestSurface
 *            E_FAIL, if SrcFormat is D3DFMT_UNKNOWN or the dimensions of pSrcRect are invalid
 *
 * NOTES
 *   pSrcRect specifies the dimensions of the source data;
 *   negative values for pSrcRect are allowed as we're only looking at the width and height anyway.
 *
 */
HRESULT WINAPI D3DXLoadSurfaceFromMemory(LPDIRECT3DSURFACE9 pDestSurface,
                                         CONST PALETTEENTRY *pDestPalette,
                                         CONST RECT *pDestRect,
                                         LPCVOID pSrcMemory,
                                         D3DFORMAT SrcFormat,
                                         UINT SrcPitch,
                                         CONST PALETTEENTRY *pSrcPalette,
                                         CONST RECT *pSrcRect,
                                         DWORD dwFilter,
                                         D3DCOLOR Colorkey)
{
    CONST PixelFormatDesc *srcformatdesc, *destformatdesc;
    D3DSURFACE_DESC surfdesc;
    D3DLOCKED_RECT lockrect;
    POINT srcsize, destsize;
    HRESULT hr;

    TRACE("(%p, %p, %p, %p, %x, %u, %p, %p %u, %#x)\n", pDestSurface, pDestPalette, pDestRect, pSrcMemory,
        SrcFormat, SrcPitch, pSrcPalette, pSrcRect, dwFilter, Colorkey);

    if( !pDestSurface || !pSrcMemory || !pSrcRect ) return D3DERR_INVALIDCALL;
    if(SrcFormat == D3DFMT_UNKNOWN || pSrcRect->left >= pSrcRect->right || pSrcRect->top >= pSrcRect->bottom) return E_FAIL;

    if(dwFilter == D3DX_DEFAULT) dwFilter = D3DX_FILTER_TRIANGLE | D3DX_FILTER_DITHER;

    IDirect3DSurface9_GetDesc(pDestSurface, &surfdesc);

    srcformatdesc = get_format_info(SrcFormat);
    destformatdesc = get_format_info(surfdesc.Format);
    if( srcformatdesc->type == FORMAT_UNKNOWN ||  srcformatdesc->bytes_per_pixel > 4) return E_NOTIMPL;
    if(destformatdesc->type == FORMAT_UNKNOWN || destformatdesc->bytes_per_pixel > 4) return E_NOTIMPL;

    srcsize.x = pSrcRect->right - pSrcRect->left;
    srcsize.y = pSrcRect->bottom - pSrcRect->top;
    if( !pDestRect ) {
        destsize.x = surfdesc.Width;
        destsize.y = surfdesc.Height;
    } else {
        if(pDestRect->left > pDestRect->right || pDestRect->right > surfdesc.Width) return D3DERR_INVALIDCALL;
        if(pDestRect->top > pDestRect->bottom || pDestRect->bottom > surfdesc.Height) return D3DERR_INVALIDCALL;
        if(pDestRect->left < 0 || pDestRect->top < 0) return D3DERR_INVALIDCALL;
        destsize.x = pDestRect->right - pDestRect->left;
        destsize.y = pDestRect->bottom - pDestRect->top;
        if(destsize.x == 0 || destsize.y == 0) return D3D_OK;
    }

    hr = IDirect3DSurface9_LockRect(pDestSurface, &lockrect, pDestRect, 0);
    if(FAILED(hr)) return D3DXERR_INVALIDDATA;

    if((dwFilter & 0xF) == D3DX_FILTER_NONE) {
        copy_simple_data(pSrcMemory, SrcPitch, srcsize, srcformatdesc,
                         lockrect.pBits, lockrect.Pitch, destsize, destformatdesc,
                         Colorkey);
    } else /*if((dwFilter & 0xF) == D3DX_FILTER_POINT) */ {
        /* always apply a point filter until D3DX_FILTER_LINEAR, D3DX_FILTER_TRIANGLE and D3DX_FILTER_BOX are implemented */
        point_filter_simple_data(pSrcMemory, SrcPitch, srcsize, srcformatdesc,
                                 lockrect.pBits, lockrect.Pitch, destsize, destformatdesc,
                                 Colorkey);
    }

    IDirect3DSurface9_UnlockRect(pDestSurface);
    return D3D_OK;
}

/************************************************************
 * D3DXLoadSurfaceFromSurface
 *
 * Copies the contents from one surface to another, performing any required
 * format conversion, resizing or filtering.
 *
 * PARAMS
 *   pDestSurface [I] pointer to the destination surface
 *   pDestPalette [I] palette to use
 *   pDestRect    [I] to be filled area of the surface
 *   pSrcSurface  [I] pointer to the source surface
 *   pSrcPalette  [I] palette used for the source surface
 *   pSrcRect     [I] area of the source data to load
 *   dwFilter     [I] filter to apply on resizing
 *   Colorkey     [I] any ARGB value or 0 to disable color-keying
 *
 * RETURNS
 *   Success: D3D_OK
 *   Failure: D3DERR_INVALIDCALL, if pDestSurface or pSrcSurface are NULL
 *            D3DXERR_INVALIDDATA, if one of the surfaces is not lockable
 *
 */
HRESULT WINAPI D3DXLoadSurfaceFromSurface(LPDIRECT3DSURFACE9 pDestSurface,
                                          CONST PALETTEENTRY *pDestPalette,
                                          CONST RECT *pDestRect,
                                          LPDIRECT3DSURFACE9 pSrcSurface,
                                          CONST PALETTEENTRY *pSrcPalette,
                                          CONST RECT *pSrcRect,
                                          DWORD dwFilter,
                                          D3DCOLOR Colorkey)
{
    RECT rect;
    D3DLOCKED_RECT lock;
    D3DSURFACE_DESC SrcDesc;
    HRESULT hr;

    TRACE("(%p, %p, %p, %p, %p, %p, %u, %#x): relay\n", pDestSurface, pDestPalette, pDestRect,
        pSrcSurface, pSrcPalette, pSrcRect, dwFilter, Colorkey);

    if( !pDestSurface || !pSrcSurface ) return D3DERR_INVALIDCALL;

    IDirect3DSurface9_GetDesc(pSrcSurface, &SrcDesc);

    if( !pSrcRect ) SetRect(&rect, 0, 0, SrcDesc.Width, SrcDesc.Height);
    else rect = *pSrcRect;

    hr = IDirect3DSurface9_LockRect(pSrcSurface, &lock, NULL, D3DLOCK_READONLY);
    if(FAILED(hr)) return D3DXERR_INVALIDDATA;

    hr = D3DXLoadSurfaceFromMemory(pDestSurface, pDestPalette, pDestRect,
                                   lock.pBits, SrcDesc.Format, lock.Pitch,
                                   pSrcPalette, &rect, dwFilter, Colorkey);

    IDirect3DSurface9_UnlockRect(pSrcSurface);
    return hr;
}


HRESULT WINAPI D3DXSaveSurfaceToFileA(LPCSTR pDestFile, D3DXIMAGE_FILEFORMAT DestFormat,
        LPDIRECT3DSURFACE9 pSrcSurface, const PALETTEENTRY* pSrcPalette, const RECT* pSrcRect)
{
    FIXME("(%p, %d, %p, %p, %p): stub\n", pDestFile, DestFormat, pSrcSurface, pSrcPalette, pSrcRect);
    return D3DERR_INVALIDCALL;
}

HRESULT WINAPI D3DXSaveSurfaceToFileW(LPCWSTR pDestFile, D3DXIMAGE_FILEFORMAT DestFormat,
        LPDIRECT3DSURFACE9 pSrcSurface, const PALETTEENTRY* pSrcPalette, const RECT* pSrcRect)
{
    FIXME("(%p, %d, %p, %p, %p): stub\n", pDestFile, DestFormat, pSrcSurface, pSrcPalette, pSrcRect);
    return D3DERR_INVALIDCALL;
}