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windowscodecs: Implement Initialize for the PNG decoder.

This commit is contained in:
Vincent Povirk 2009-08-13 17:50:16 -05:00 committed by Alexandre Julliard
parent f626204321
commit 7d74dba5b8
1 changed files with 199 additions and 2 deletions
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201
dlls/windowscodecs/pngformat.c
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@ -45,6 +45,19 @@ static void *libpng_handle;
#define MAKE_FUNCPTR(f) static typeof(f) * p##f
MAKE_FUNCPTR(png_create_read_struct);
MAKE_FUNCPTR(png_create_info_struct);
MAKE_FUNCPTR(png_destroy_read_struct);
MAKE_FUNCPTR(png_error);
MAKE_FUNCPTR(png_get_bit_depth);
MAKE_FUNCPTR(png_get_color_type);
MAKE_FUNCPTR(png_get_image_height);
MAKE_FUNCPTR(png_get_image_width);
MAKE_FUNCPTR(png_get_io_ptr);
MAKE_FUNCPTR(png_set_bgr);
MAKE_FUNCPTR(png_set_gray_to_rgb);
MAKE_FUNCPTR(png_set_read_fn);
MAKE_FUNCPTR(png_read_end);
MAKE_FUNCPTR(png_read_image);
MAKE_FUNCPTR(png_read_info);
#undef MAKE_FUNCPTR
static void *load_libpng(void)
@ -58,6 +71,19 @@ static void *load_libpng(void)
}
LOAD_FUNCPTR(png_create_read_struct);
LOAD_FUNCPTR(png_create_info_struct);
LOAD_FUNCPTR(png_destroy_read_struct);
LOAD_FUNCPTR(png_error);
LOAD_FUNCPTR(png_get_bit_depth);
LOAD_FUNCPTR(png_get_color_type);
LOAD_FUNCPTR(png_get_image_height);
LOAD_FUNCPTR(png_get_image_width);
LOAD_FUNCPTR(png_get_io_ptr);
LOAD_FUNCPTR(png_set_bgr);
LOAD_FUNCPTR(png_set_gray_to_rgb);
LOAD_FUNCPTR(png_set_read_fn);
LOAD_FUNCPTR(png_read_end);
LOAD_FUNCPTR(png_read_image);
LOAD_FUNCPTR(png_read_info);
#undef LOAD_FUNCPTR
}
@ -67,6 +93,15 @@ static void *load_libpng(void)
typedef struct {
const IWICBitmapDecoderVtbl *lpVtbl;
LONG ref;
png_structp png_ptr;
png_infop info_ptr;
png_infop end_info;
BOOL initialized;
int bpp;
int width, height;
UINT stride;
const WICPixelFormatGUID *format;
BYTE *image_bits;
} PngDecoder;
static HRESULT WINAPI PngDecoder_QueryInterface(IWICBitmapDecoder *iface, REFIID iid,
@ -110,6 +145,9 @@ static ULONG WINAPI PngDecoder_Release(IWICBitmapDecoder *iface)
if (ref == 0)
{
if (This->png_ptr)
ppng_destroy_read_struct(&This->png_ptr, &This->info_ptr, &This->end_info);
HeapFree(GetProcessHeap(), 0, This->image_bits);
HeapFree(GetProcessHeap(), 0, This);
}
@ -123,11 +161,165 @@ static HRESULT WINAPI PngDecoder_QueryCapability(IWICBitmapDecoder *iface, IStre
return E_NOTIMPL;
}
static void user_read_data(png_structp png_ptr, png_bytep data, png_size_t length)
{
IStream *stream = ppng_get_io_ptr(png_ptr);
HRESULT hr;
ULONG bytesread;
hr = IStream_Read(stream, data, length, &bytesread);
if (FAILED(hr) || bytesread != length)
{
ppng_error(png_ptr, "failed reading data");
}
}
static HRESULT WINAPI PngDecoder_Initialize(IWICBitmapDecoder *iface, IStream *pIStream,
WICDecodeOptions cacheOptions)
{
FIXME("(%p,%p,%x): stub\n", iface, pIStream, cacheOptions);
return E_NOTIMPL;
PngDecoder *This = (PngDecoder*)iface;
LARGE_INTEGER seek;
HRESULT hr;
png_bytep *row_pointers=NULL;
UINT image_size;
UINT i;
int color_type, bit_depth;
TRACE("(%p,%p,%x)\n", iface, pIStream, cacheOptions);
/* initialize libpng */
This->png_ptr = ppng_create_read_struct(PNG_LIBPNG_VER_STRING, NULL, NULL, NULL);
if (!This->png_ptr) return E_FAIL;
This->info_ptr = ppng_create_info_struct(This->png_ptr);
if (!This->info_ptr)
{
ppng_destroy_read_struct(&This->png_ptr, (png_infopp)NULL, (png_infopp)NULL);
This->png_ptr = NULL;
return E_FAIL;
}
This->end_info = ppng_create_info_struct(This->png_ptr);
if (!This->info_ptr)
{
ppng_destroy_read_struct(&This->png_ptr, &This->info_ptr, (png_infopp)NULL);
This->png_ptr = NULL;
return E_FAIL;
}
/* set up setjmp/longjmp error handling */
if (setjmp(png_jmpbuf(This->png_ptr)))
{
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;
}
/* seek to the start of the stream */
seek.QuadPart = 0;
hr = IStream_Seek(pIStream, seek, STREAM_SEEK_SET, NULL);
if (FAILED(hr)) return hr;
/* set up custom i/o handling */
ppng_set_read_fn(This->png_ptr, pIStream, user_read_data);
/* read the header */
ppng_read_info(This->png_ptr, This->info_ptr);
/* choose a pixel format */
color_type = ppng_get_color_type(This->png_ptr, This->info_ptr);
bit_depth = ppng_get_bit_depth(This->png_ptr, This->info_ptr);
switch (color_type)
{
case PNG_COLOR_TYPE_GRAY:
This->bpp = bit_depth;
switch (bit_depth)
{
case 1: This->format = &GUID_WICPixelFormatBlackWhite; break;
case 2: This->format = &GUID_WICPixelFormat2bppGray; break;
case 4: This->format = &GUID_WICPixelFormat4bppGray; break;
case 8: This->format = &GUID_WICPixelFormat8bppGray; break;
case 16: This->format = &GUID_WICPixelFormat16bppGray; break;
default:
ERR("invalid grayscale bit depth: %i\n", bit_depth);
return E_FAIL;
}
break;
case PNG_COLOR_TYPE_GRAY_ALPHA:
/* WIC does not support grayscale alpha formats so use RGBA */
ppng_set_gray_to_rgb(This->png_ptr);
case PNG_COLOR_TYPE_RGB_ALPHA:
This->bpp = bit_depth * 4;
switch (bit_depth)
{
case 8:
ppng_set_bgr(This->png_ptr);
This->format = &GUID_WICPixelFormat32bppBGRA;
break;
case 16: This->format = &GUID_WICPixelFormat64bppRGBA; break;
default:
ERR("invalid RGBA bit depth: %i\n", bit_depth);
return E_FAIL;
}
break;
case PNG_COLOR_TYPE_PALETTE:
This->bpp = bit_depth;
switch (bit_depth)
{
case 1: This->format = &GUID_WICPixelFormat1bppIndexed; break;
case 2: This->format = &GUID_WICPixelFormat2bppIndexed; break;
case 4: This->format = &GUID_WICPixelFormat4bppIndexed; break;
case 8: This->format = &GUID_WICPixelFormat8bppIndexed; break;
default:
ERR("invalid indexed color bit depth: %i\n", bit_depth);
return E_FAIL;
}
break;
case PNG_COLOR_TYPE_RGB:
This->bpp = bit_depth * 3;
switch (bit_depth)
{
case 8:
ppng_set_bgr(This->png_ptr);
This->format = &GUID_WICPixelFormat24bppBGR;
break;
case 16: This->format = &GUID_WICPixelFormat48bppRGB; break;
default:
ERR("invalid RGB color bit depth: %i\n", bit_depth);
return E_FAIL;
}
break;
default:
ERR("invalid color type %i\n", color_type);
return E_FAIL;
}
/* read the image data */
This->width = ppng_get_image_width(This->png_ptr, This->info_ptr);
This->height = ppng_get_image_height(This->png_ptr, This->info_ptr);
This->stride = This->width * This->bpp;
image_size = This->stride * This->height;
This->image_bits = HeapAlloc(GetProcessHeap(), 0, image_size);
if (!This->image_bits) return E_OUTOFMEMORY;
row_pointers = HeapAlloc(GetProcessHeap(), 0, sizeof(png_bytep)*This->height);
if (!row_pointers) return E_OUTOFMEMORY;
for (i=0; i<This->height; i++)
row_pointers[i] = This->image_bits + i * This->stride;
ppng_read_image(This->png_ptr, row_pointers);
HeapFree(GetProcessHeap(), 0, row_pointers);
row_pointers = NULL;
ppng_read_end(This->png_ptr, This->end_info);
This->initialized = TRUE;
return S_OK;
}
static HRESULT WINAPI PngDecoder_GetContainerFormat(IWICBitmapDecoder *iface,
@ -232,6 +424,11 @@ HRESULT PngDecoder_CreateInstance(IUnknown *pUnkOuter, REFIID iid, void** ppv)
This->lpVtbl = &PngDecoder_Vtbl;
This->ref = 1;
This->png_ptr = NULL;
This->info_ptr = NULL;
This->end_info = NULL;
This->initialized = FALSE;
This->image_bits = NULL;
ret = IUnknown_QueryInterface((IUnknown*)This, iid, ppv);
IUnknown_Release((IUnknown*)This);