Sweden-Number/dlls/windowscodecs/wincodecs_common.h

180 lines
5.0 KiB
C

/*
* Copyright 2020 Esme Povirk
*
* 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
*/
HRESULT CDECL decoder_initialize(struct decoder *decoder, IStream *stream, struct decoder_stat *st)
{
return decoder->vtable->initialize(decoder, stream, st);
}
HRESULT CDECL decoder_get_frame_info(struct decoder *decoder, UINT frame, struct decoder_frame *info)
{
return decoder->vtable->get_frame_info(decoder, frame, info);
}
HRESULT CDECL decoder_copy_pixels(struct decoder *decoder, UINT frame,
const WICRect *prc, UINT stride, UINT buffersize, BYTE *buffer)
{
return decoder->vtable->copy_pixels(decoder, frame, prc, stride, buffersize, buffer);
}
HRESULT CDECL decoder_get_metadata_blocks(struct decoder *decoder, UINT frame, UINT *count, struct decoder_block **blocks)
{
return decoder->vtable->get_metadata_blocks(decoder, frame, count, blocks);
}
HRESULT CDECL decoder_get_color_context(struct decoder *decoder, UINT frame,
UINT num, BYTE **data, DWORD *datasize)
{
return decoder->vtable->get_color_context(decoder, frame, num, data, datasize);
}
void CDECL decoder_destroy(struct decoder *decoder)
{
decoder->vtable->destroy(decoder);
}
HRESULT copy_pixels(UINT bpp, const BYTE *srcbuffer,
UINT srcwidth, UINT srcheight, INT srcstride,
const WICRect *rc, UINT dststride, UINT dstbuffersize, BYTE *dstbuffer)
{
UINT bytesperrow;
UINT row_offset; /* number of bits into the source rows where the data starts */
WICRect rect;
if (!rc)
{
rect.X = 0;
rect.Y = 0;
rect.Width = srcwidth;
rect.Height = srcheight;
rc = ▭
}
else
{
if (rc->X < 0 || rc->Y < 0 || rc->X+rc->Width > srcwidth || rc->Y+rc->Height > srcheight)
return E_INVALIDARG;
}
bytesperrow = ((bpp * rc->Width)+7)/8;
if (dststride < bytesperrow)
return E_INVALIDARG;
if ((dststride * (rc->Height-1)) + bytesperrow > dstbuffersize)
return E_INVALIDARG;
/* if the whole bitmap is copied and the buffer format matches then it's a matter of a single memcpy */
if (rc->X == 0 && rc->Y == 0 && rc->Width == srcwidth && rc->Height == srcheight &&
srcstride == dststride && srcstride == bytesperrow)
{
memcpy(dstbuffer, srcbuffer, srcstride * srcheight);
return S_OK;
}
row_offset = rc->X * bpp;
if (row_offset % 8 == 0)
{
/* everything lines up on a byte boundary */
INT row;
const BYTE *src;
BYTE *dst;
src = srcbuffer + (row_offset / 8) + srcstride * rc->Y;
dst = dstbuffer;
for (row=0; row < rc->Height; row++)
{
memcpy(dst, src, bytesperrow);
src += srcstride;
dst += dststride;
}
return S_OK;
}
else
{
/* we have to do a weird bitwise copy. eww. */
FIXME("cannot reliably copy bitmap data if bpp < 8\n");
return E_FAIL;
}
}
static inline ULONG read_ulong_be(BYTE* data)
{
return data[0] << 24 | data[1] << 16 | data[2] << 8 | data[3];
}
HRESULT read_png_chunk(IStream *stream, BYTE *type, BYTE **data, ULONG *data_size)
{
BYTE header[8];
HRESULT hr;
ULONG bytesread;
hr = stream_read(stream, header, 8, &bytesread);
if (FAILED(hr) || bytesread < 8)
{
if (SUCCEEDED(hr))
hr = E_FAIL;
return hr;
}
*data_size = read_ulong_be(&header[0]);
memcpy(type, &header[4], 4);
if (data)
{
*data = RtlAllocateHeap(GetProcessHeap(), 0, *data_size);
if (!*data)
return E_OUTOFMEMORY;
hr = stream_read(stream, *data, *data_size, &bytesread);
if (FAILED(hr) || bytesread < *data_size)
{
if (SUCCEEDED(hr))
hr = E_FAIL;
RtlFreeHeap(GetProcessHeap(), 0, *data);
*data = NULL;
return hr;
}
/* Windows ignores CRC of the chunk */
}
return S_OK;
}
void reverse_bgr8(UINT bytesperpixel, LPBYTE bits, UINT width, UINT height, INT stride)
{
UINT x, y;
BYTE *pixel, temp;
for (y=0; y<height; y++)
{
pixel = bits + stride * y;
for (x=0; x<width; x++)
{
temp = pixel[2];
pixel[2] = pixel[0];
pixel[0] = temp;
pixel += bytesperpixel;
}
}
}