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windowscodecs: Add locking to the PNG decoder.

This commit is contained in:
Vincent Povirk 2010-04-09 14:01:06 -05:00 committed by Alexandre Julliard
parent 122e02e368
commit 7871033a40
2 changed files with 68 additions and 18 deletions
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84
dlls/windowscodecs/pngformat.c
View File

@ -162,6 +162,7 @@ typedef struct {
UINT stride;
const WICPixelFormatGUID *format;
BYTE *image_bits;
CRITICAL_SECTION lock; /* must be held when png structures are accessed or initialized is set */
} PngDecoder;
static inline PngDecoder *impl_from_frame(IWICBitmapFrameDecode *iface)
@ -214,6 +215,8 @@ static ULONG WINAPI PngDecoder_Release(IWICBitmapDecoder *iface)
{
if (This->png_ptr)
ppng_destroy_read_struct(&This->png_ptr, &This->info_ptr, &This->end_info);
This->lock.DebugInfo->Spare[0] = 0;
DeleteCriticalSection(&This->lock);
HeapFree(GetProcessHeap(), 0, This->image_bits);
HeapFree(GetProcessHeap(), 0, This);
}
@ -246,7 +249,7 @@ static HRESULT WINAPI PngDecoder_Initialize(IWICBitmapDecoder *iface, IStream *p
{
PngDecoder *This = (PngDecoder*)iface;
LARGE_INTEGER seek;
HRESULT hr;
HRESULT hr=S_OK;
png_bytep *row_pointers=NULL;
UINT image_size;
UINT i;
@ -259,16 +262,23 @@ static HRESULT WINAPI PngDecoder_Initialize(IWICBitmapDecoder *iface, IStream *p
TRACE("(%p,%p,%x)\n", iface, pIStream, cacheOptions);
EnterCriticalSection(&This->lock);
/* initialize libpng */
This->png_ptr = ppng_create_read_struct(PNG_LIBPNG_VER_STRING, NULL, NULL, NULL);
if (!This->png_ptr) return E_FAIL;
if (!This->png_ptr)
{
hr = E_FAIL;
goto end;
}
This->info_ptr = ppng_create_info_struct(This->png_ptr);
if (!This->info_ptr)
{
ppng_destroy_read_struct(&This->png_ptr, NULL, NULL);
This->png_ptr = NULL;
return E_FAIL;
hr = E_FAIL;
goto end;
}
This->end_info = ppng_create_info_struct(This->png_ptr);
@ -276,7 +286,8 @@ static HRESULT WINAPI PngDecoder_Initialize(IWICBitmapDecoder *iface, IStream *p
{
ppng_destroy_read_struct(&This->png_ptr, &This->info_ptr, NULL);
This->png_ptr = NULL;
return E_FAIL;
hr = E_FAIL;
goto end;
}
/* set up setjmp/longjmp error handling */
@ -285,14 +296,15 @@ static HRESULT WINAPI PngDecoder_Initialize(IWICBitmapDecoder *iface, IStream *p
ppng_destroy_read_struct(&This->png_ptr, &This->info_ptr, &This->end_info);
HeapFree(GetProcessHeap(), 0, row_pointers);
This->png_ptr = NULL;
return E_FAIL;
hr = E_FAIL;
goto end;
}
ppng_set_error_fn(This->png_ptr, &jmpbuf, user_error_fn, user_warning_fn);
/* seek to the start of the stream */
seek.QuadPart = 0;
hr = IStream_Seek(pIStream, seek, STREAM_SEEK_SET, NULL);
if (FAILED(hr)) return hr;
if (FAILED(hr)) goto end;
/* set up custom i/o handling */
ppng_set_read_fn(This->png_ptr, pIStream, user_read_data);
@ -340,7 +352,8 @@ static HRESULT WINAPI PngDecoder_Initialize(IWICBitmapDecoder *iface, IStream *p
case 16: This->format = &GUID_WICPixelFormat16bppGray; break;
default:
ERR("invalid grayscale bit depth: %i\n", bit_depth);
return E_FAIL;
hr = E_FAIL;
goto end;
}
break;
case PNG_COLOR_TYPE_GRAY_ALPHA:
@ -357,7 +370,8 @@ static HRESULT WINAPI PngDecoder_Initialize(IWICBitmapDecoder *iface, IStream *p
case 16: This->format = &GUID_WICPixelFormat64bppRGBA; break;
default:
ERR("invalid RGBA bit depth: %i\n", bit_depth);
return E_FAIL;
hr = E_FAIL;
goto end;
}
break;
case PNG_COLOR_TYPE_PALETTE:
@ -370,7 +384,8 @@ static HRESULT WINAPI PngDecoder_Initialize(IWICBitmapDecoder *iface, IStream *p
case 8: This->format = &GUID_WICPixelFormat8bppIndexed; break;
default:
ERR("invalid indexed color bit depth: %i\n", bit_depth);
return E_FAIL;
hr = E_FAIL;
goto end;
}
break;
case PNG_COLOR_TYPE_RGB:
@ -384,12 +399,14 @@ static HRESULT WINAPI PngDecoder_Initialize(IWICBitmapDecoder *iface, IStream *p
case 16: This->format = &GUID_WICPixelFormat48bppRGB; break;
default:
ERR("invalid RGB color bit depth: %i\n", bit_depth);
return E_FAIL;
hr = E_FAIL;
goto end;
}
break;
default:
ERR("invalid color type %i\n", color_type);
return E_FAIL;
hr = E_FAIL;
goto end;
}
/* read the image data */
@ -399,10 +416,18 @@ static HRESULT WINAPI PngDecoder_Initialize(IWICBitmapDecoder *iface, IStream *p
image_size = This->stride * This->height;
This->image_bits = HeapAlloc(GetProcessHeap(), 0, image_size);
if (!This->image_bits) return E_OUTOFMEMORY;
if (!This->image_bits)
{
hr = E_OUTOFMEMORY;
goto end;
}
row_pointers = HeapAlloc(GetProcessHeap(), 0, sizeof(png_bytep)*This->height);
if (!row_pointers) return E_OUTOFMEMORY;
if (!row_pointers)
{
hr = E_OUTOFMEMORY;
goto end;
}
for (i=0; i<This->height; i++)
row_pointers[i] = This->image_bits + i * This->stride;
@ -416,7 +441,11 @@ static HRESULT WINAPI PngDecoder_Initialize(IWICBitmapDecoder *iface, IStream *p
This->initialized = TRUE;
return S_OK;
end:
LeaveCriticalSection(&This->lock);
return hr;
}
static HRESULT WINAPI PngDecoder_GetContainerFormat(IWICBitmapDecoder *iface,
@ -570,6 +599,8 @@ static HRESULT WINAPI PngDecoder_Frame_GetResolution(IWICBitmapFrameDecode *ifac
png_uint_32 ret, xres, yres;
int unit_type;
EnterCriticalSection(&This->lock);
ret = ppng_get_pHYs(This->png_ptr, This->info_ptr, &xres, &yres, &unit_type);
if (ret && unit_type == PNG_RESOLUTION_METER)
@ -583,6 +614,8 @@ static HRESULT WINAPI PngDecoder_Frame_GetResolution(IWICBitmapFrameDecode *ifac
*pDpiX = *pDpiY = 96.0;
}
LeaveCriticalSection(&This->lock);
TRACE("(%p)->(%0.2f,%0.2f)\n", iface, *pDpiX, *pDpiY);
return S_OK;
@ -600,16 +633,24 @@ static HRESULT WINAPI PngDecoder_Frame_CopyPalette(IWICBitmapFrameDecode *iface,
int num_trans;
png_color_16p trans_values;
int i;
HRESULT hr=S_OK;
TRACE("(%p,%p)\n", iface, pIPalette);
EnterCriticalSection(&This->lock);
ret = ppng_get_PLTE(This->png_ptr, This->info_ptr, &png_palette, &num_palette);
if (!ret) return WINCODEC_ERR_PALETTEUNAVAILABLE;
if (!ret)
{
hr = WINCODEC_ERR_PALETTEUNAVAILABLE;
goto end;
}
if (num_palette > 256)
{
ERR("palette has %i colors?!\n", num_palette);
return E_FAIL;
hr = E_FAIL;
goto end;
}
for (i=0; i<num_palette; i++)
@ -629,7 +670,14 @@ static HRESULT WINAPI PngDecoder_Frame_CopyPalette(IWICBitmapFrameDecode *iface,
}
}
return IWICPalette_InitializeCustom(pIPalette, palette, num_palette);
end:
LeaveCriticalSection(&This->lock);
if (SUCCEEDED(hr))
hr = IWICPalette_InitializeCustom(pIPalette, palette, num_palette);
return hr;
}
static HRESULT WINAPI PngDecoder_Frame_CopyPixels(IWICBitmapFrameDecode *iface,
@ -706,6 +754,8 @@ HRESULT PngDecoder_CreateInstance(IUnknown *pUnkOuter, REFIID iid, void** ppv)
This->end_info = NULL;
This->initialized = FALSE;
This->image_bits = NULL;
InitializeCriticalSection(&This->lock);
This->lock.DebugInfo->Spare[0] = (DWORD_PTR)(__FILE__ ": PngDecoder.lock");
ret = IUnknown_QueryInterface((IUnknown*)This, iid, ppv);
IUnknown_Release((IUnknown*)This);

2
dlls/windowscodecs/regsvr.c
View File

@ -739,7 +739,7 @@ static struct regsvr_coclass const coclass_list[] = {
"WIC PNG Decoder",
NULL,
"windowscodecs.dll",
"Apartment"
"Both"
},
{ &CLSID_WICPngEncoder,
"WIC PNG Encoder",