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windowscodecs: Implement CopyPixels for the JPEG decoder.

This commit is contained in:
Vincent Povirk 2009-08-24 13:08:30 -05:00 committed by Alexandre Julliard
parent 7d63abc9ec
commit 529bdca8a8
1 changed files with 68 additions and 2 deletions
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70
dlls/windowscodecs/jpegformat.c
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@ -63,6 +63,7 @@ static void *libjpeg_handle;
MAKE_FUNCPTR(jpeg_CreateDecompress);
MAKE_FUNCPTR(jpeg_destroy_decompress);
MAKE_FUNCPTR(jpeg_read_header);
MAKE_FUNCPTR(jpeg_read_scanlines);
MAKE_FUNCPTR(jpeg_resync_to_restart);
MAKE_FUNCPTR(jpeg_start_decompress);
MAKE_FUNCPTR(jpeg_std_error);
@ -81,6 +82,7 @@ static void *load_libjpeg(void)
LOAD_FUNCPTR(jpeg_CreateDecompress);
LOAD_FUNCPTR(jpeg_destroy_decompress);
LOAD_FUNCPTR(jpeg_read_header);
LOAD_FUNCPTR(jpeg_read_scanlines);
LOAD_FUNCPTR(jpeg_resync_to_restart);
LOAD_FUNCPTR(jpeg_start_decompress);
LOAD_FUNCPTR(jpeg_std_error);
@ -100,6 +102,7 @@ typedef struct {
struct jpeg_error_mgr jerr;
struct jpeg_source_mgr source_mgr;
BYTE source_buffer[1024];
BYTE *image_data;
} JpegDecoder;
static inline JpegDecoder *decoder_from_decompress(j_decompress_ptr decompress)
@ -155,6 +158,7 @@ static ULONG WINAPI JpegDecoder_Release(IWICBitmapDecoder *iface)
{
if (This->cinfo_initialized) pjpeg_destroy_decompress(&This->cinfo);
if (This->stream) IStream_Release(This->stream);
HeapFree(GetProcessHeap(), 0, This->image_data);
HeapFree(GetProcessHeap(), 0, This);
}
@ -428,8 +432,69 @@ static HRESULT WINAPI JpegDecoder_Frame_CopyPalette(IWICBitmapFrameDecode *iface
static HRESULT WINAPI JpegDecoder_Frame_CopyPixels(IWICBitmapFrameDecode *iface,
const WICRect *prc, UINT cbStride, UINT cbBufferSize, BYTE *pbBuffer)
{
FIXME("(%p,%p,%u,%u,%p): stub\n", iface, prc, cbStride, cbBufferSize, pbBuffer);
return E_NOTIMPL;
JpegDecoder *This = decoder_from_frame(iface);
UINT bpp;
UINT stride;
UINT data_size;
UINT max_row_needed;
TRACE("(%p,%p,%u,%u,%p)\n", iface, prc, cbStride, cbBufferSize, pbBuffer);
if (This->cinfo.out_color_space == JCS_GRAYSCALE) bpp = 8;
else bpp = 24;
stride = bpp * This->cinfo.output_width;
data_size = stride * This->cinfo.output_height;
max_row_needed = prc->Y + prc->Height;
if (max_row_needed > This->cinfo.output_height) return E_INVALIDARG;
if (!This->image_data)
{
This->image_data = HeapAlloc(GetProcessHeap(), 0, data_size);
if (!This->image_data) return E_OUTOFMEMORY;
}
while (max_row_needed > This->cinfo.output_scanline)
{
UINT first_scanline = This->cinfo.output_scanline;
UINT max_rows;
JSAMPROW out_rows[4];
UINT i, j;
JDIMENSION ret;
max_rows = min(This->cinfo.output_height-first_scanline, 4);
for (i=0; i<max_rows; i++)
out_rows[i] = This->image_data + stride * (first_scanline+i);
ret = pjpeg_read_scanlines(&This->cinfo, out_rows, max_rows);
if (ret == 0)
{
ERR("read_scanlines failed\n");
return E_FAIL;
}
if (bpp == 24)
{
/* libjpeg gives us RGB data and we want BGR, so byteswap the data */
for (i=first_scanline; i<This->cinfo.output_scanline; i++)
{
BYTE *pixel = This->image_data + stride * i;
for (j=0; j<This->cinfo.output_width; j++)
{
BYTE red=pixel[0];
BYTE blue=pixel[2];
pixel[0]=blue;
pixel[2]=red;
pixel+=3;
}
}
}
}
return copy_pixels(bpp, This->image_data,
This->cinfo.output_width, This->cinfo.output_height, stride,
prc, cbStride, cbBufferSize, pbBuffer);
}
static HRESULT WINAPI JpegDecoder_Frame_GetMetadataQueryReader(IWICBitmapFrameDecode *iface,
@ -493,6 +558,7 @@ HRESULT JpegDecoder_CreateInstance(IUnknown *pUnkOuter, REFIID iid, void** ppv)
This->initialized = FALSE;
This->cinfo_initialized = FALSE;
This->stream = NULL;
This->image_data = NULL;
ret = IUnknown_QueryInterface((IUnknown*)This, iid, ppv);
IUnknown_Release((IUnknown*)This);