windowscodecs: Implement BitmapScaler_CopyPixels.

dlls/windowscodecs/main.c

@@ -17,6 +17,7 @@
  */
 
 
+#define COBJMACROS
 #include "config.h"
 
 #include <stdarg.h>
@@ -136,3 +137,27 @@ void reverse_bgr8(UINT bytesperpixel, LPBYTE bits, UINT width, UINT height, INT
         }
     }
 }
+
+HRESULT get_pixelformat_bpp(const GUID *pixelformat, UINT *bpp)
+{
+    HRESULT hr;
+    IWICComponentInfo *info;
+    IWICPixelFormatInfo *formatinfo;
+
+    hr = CreateComponentInfo(pixelformat, &info);
+    if (SUCCEEDED(hr))
+    {
+        hr = IWICComponentInfo_QueryInterface(info, &IID_IWICPixelFormatInfo, (void**)&formatinfo);
+
+        if (SUCCEEDED(hr))
+        {
+            hr = IWICPixelFormatInfo_GetBitsPerPixel(formatinfo, bpp);
+
+            IWICPixelFormatInfo_Release(formatinfo);
+        }
+
+        IWICComponentInfo_Release(info);
+    }
+
+    return hr;
+}

dlls/windowscodecs/scaler.c

@@ -38,7 +38,11 @@ typedef struct BitmapScaler {
     LONG ref;
     IWICBitmapSource *source;
     UINT width, height;
+    UINT src_width, src_height;
     WICBitmapInterpolationMode mode;
+    UINT bpp;
+    void (*fn_get_required_source_rect)(struct BitmapScaler*,UINT,UINT,WICRect*);
+    void (*fn_copy_scanline)(struct BitmapScaler*,UINT,UINT,UINT,BYTE**,UINT,UINT,BYTE*);
     CRITICAL_SECTION lock; /* must be held when initialized */
 } BitmapScaler;
 
@@ -162,12 +166,138 @@ static HRESULT WINAPI BitmapScaler_CopyPalette(IWICBitmapScaler *iface,
     return IWICBitmapSource_CopyPalette(This->source, pIPalette);
 }
 
+static void NearestNeighbor_GetRequiredSourceRect(BitmapScaler *This,
+    UINT x, UINT y, WICRect *src_rect)
+{
+    src_rect->X = x * This->src_width / This->width;
+    src_rect->Y = y * This->src_height / This->height;
+    src_rect->Width = src_rect->Height = 1;
+}
+
+static void NearestNeighbor_CopyScanline(BitmapScaler *This,
+    UINT dst_x, UINT dst_y, UINT dst_width,
+    BYTE **src_data, UINT src_data_x, UINT src_data_y, BYTE *pbBuffer)
+{
+    int i;
+    UINT bytesperpixel = This->bpp/8;
+    UINT src_x, src_y;
+
+    src_y = dst_y * This->src_height / This->height - src_data_y;
+
+    for (i=0; i<dst_width; i++)
+    {
+        src_x = (dst_x + i) * This->src_width / This->width - src_data_x;
+        memcpy(pbBuffer + bytesperpixel * i, src_data[src_y] + bytesperpixel * src_x, bytesperpixel);
+    }
+}
+
 static HRESULT WINAPI BitmapScaler_CopyPixels(IWICBitmapScaler *iface,
     const WICRect *prc, UINT cbStride, UINT cbBufferSize, BYTE *pbBuffer)
 {
-    FIXME("(%p,%p,%u,%u,%p): stub\n", iface, prc, cbStride, cbBufferSize, pbBuffer);
+    BitmapScaler *This = impl_from_IWICBitmapScaler(iface);
+    HRESULT hr;
+    WICRect dest_rect;
+    WICRect src_rect_ul, src_rect_br, src_rect;
+    BYTE **src_rows;
+    BYTE *src_bits;
+    ULONG bytesperrow;
+    ULONG src_bytesperrow;
+    ULONG buffer_size;
+    UINT y;
+
+    TRACE("(%p,%p,%u,%u,%p)\n", iface, prc, cbStride, cbBufferSize, pbBuffer);
+
+    EnterCriticalSection(&This->lock);
+
+    if (!This->source)
+    {
+        hr = WINCODEC_ERR_WRONGSTATE;
+        goto end;
+    }
+
+    if (prc)
+        dest_rect = *prc;
+    else
+    {
+        dest_rect.X = dest_rect.Y = 0;
+        dest_rect.Width = This->width;
+        dest_rect.Height = This->height;
+    }
+
+    if (dest_rect.X < 0 || dest_rect.Y < 0 ||
+        dest_rect.X+dest_rect.Width > This->width|| dest_rect.Y+dest_rect.Height > This->height)
+    {
+        hr = E_INVALIDARG;
+        goto end;
+    }
+
+    bytesperrow = ((This->bpp * dest_rect.Width)+7)/8;
+
+    if (cbStride < bytesperrow)
+    {
+        hr = E_INVALIDARG;
+        goto end;
+    }
 
-    return E_NOTIMPL;
+    if ((cbStride * dest_rect.Height) > cbBufferSize)
+    {
+        hr = E_INVALIDARG;
+        goto end;
+    }
+
+    /* MSDN recommends calling CopyPixels once for each scanline from top to
+     * bottom, and claims codecs optimize for this. Ideally, when called in this
+     * way, we should avoid requesting a scanline from the source more than
+     * once, by saving the data that will be useful for the next scanline after
+     * the call returns. The GetRequiredSourceRect/CopyScanline functions are
+     * designed to make it possible to do this in a generic way, but for now we
+     * just grab all the data we need in each call. */
+
+    This->fn_get_required_source_rect(This, dest_rect.X, dest_rect.Y, &src_rect_ul);
+    This->fn_get_required_source_rect(This, dest_rect.X+dest_rect.Width-1,
+        dest_rect.Y+dest_rect.Height-1, &src_rect_br);
+
+    src_rect.X = src_rect_ul.X;
+    src_rect.Y = src_rect_ul.Y;
+    src_rect.Width = src_rect_br.Width + src_rect_br.X - src_rect_ul.X;
+    src_rect.Height = src_rect_br.Height + src_rect_br.Y - src_rect_ul.Y;
+
+    src_bytesperrow = (src_rect.Width * This->bpp + 7)/8;
+    buffer_size = src_bytesperrow * src_rect.Height;
+
+    src_rows = HeapAlloc(GetProcessHeap(), 0, sizeof(BYTE*) * src_rect.Height);
+    src_bits = HeapAlloc(GetProcessHeap(), 0, buffer_size);
+
+    if (!src_rows || !src_bits)
+    {
+        HeapFree(GetProcessHeap(), 0, src_rows);
+        HeapFree(GetProcessHeap(), 0, src_bits);
+        hr = E_OUTOFMEMORY;
+        goto end;
+    }
+
+    for (y=0; y<src_rect.Height; y++)
+        src_rows[y] = src_bits + y * src_bytesperrow;
+
+    hr = IWICBitmapSource_CopyPixels(This->source, &src_rect, src_bytesperrow,
+        buffer_size, src_bits);
+
+    if (SUCCEEDED(hr))
+    {
+        for (y=0; y < dest_rect.Height; y++)
+        {
+            This->fn_copy_scanline(This, dest_rect.X, dest_rect.Y+y, dest_rect.Width,
+                src_rows, src_rect.X, src_rect.Y, pbBuffer + cbStride * y);
+        }
+    }
+
+    HeapFree(GetProcessHeap(), 0, src_rows);
+    HeapFree(GetProcessHeap(), 0, src_bits);
+
+end:
+    LeaveCriticalSection(&This->lock);
+
+    return hr;
 }
 
 static HRESULT WINAPI BitmapScaler_Initialize(IWICBitmapScaler *iface,
@@ -175,7 +305,8 @@ static HRESULT WINAPI BitmapScaler_Initialize(IWICBitmapScaler *iface,
     WICBitmapInterpolationMode mode)
 {
     BitmapScaler *This = impl_from_IWICBitmapScaler(iface);
-    HRESULT hr=S_OK;
+    HRESULT hr;
+    GUID src_pixelformat;
 
     TRACE("(%p,%p,%u,%u,%u)\n", iface, pISource, uiWidth, uiHeight, mode);
 
@@ -187,13 +318,45 @@ static HRESULT WINAPI BitmapScaler_Initialize(IWICBitmapScaler *iface,
         goto end;
     }
 
-    IWICBitmapSource_AddRef(pISource);
-    This->source = pISource;
-
     This->width = uiWidth;
     This->height = uiHeight;
     This->mode = mode;
 
+    hr = IWICBitmapSource_GetSize(pISource, &This->src_width, &This->src_height);
+
+    if (SUCCEEDED(hr))
+        hr = IWICBitmapSource_GetPixelFormat(pISource, &src_pixelformat);
+
+    if (SUCCEEDED(hr))
+    {
+        hr = get_pixelformat_bpp(&src_pixelformat, &This->bpp);
+    }
+
+    if (SUCCEEDED(hr))
+    {
+        switch (mode)
+        {
+        default:
+            FIXME("unsupported mode %i\n", mode);
+            /* fall-through */
+        case WICBitmapInterpolationModeNearestNeighbor:
+            if ((This->bpp % 8) == 0)
+            {
+                IWICBitmapSource_AddRef(pISource);
+                This->source = pISource;
+            }
+            else
+            {
+                hr = WICConvertBitmapSource(&GUID_WICPixelFormat32bppBGRA,
+                    pISource, &This->source);
+                This->bpp = 32;
+            }
+            This->fn_get_required_source_rect = NearestNeighbor_GetRequiredSourceRect;
+            This->fn_copy_scanline = NearestNeighbor_CopyScanline;
+            break;
+        }
+    }
+
 end:
     LeaveCriticalSection(&This->lock);
 
@@ -224,7 +387,10 @@ HRESULT BitmapScaler_Create(IWICBitmapScaler **scaler)
     This->source = NULL;
     This->width = 0;
     This->height = 0;
+    This->src_width = 0;
+    This->src_height = 0;
     This->mode = 0;
+    This->bpp = 0;
     InitializeCriticalSection(&This->lock);
     This->lock.DebugInfo->Spare[0] = (DWORD_PTR)(__FILE__ ": BitmapScaler.lock");
 

dlls/windowscodecs/wincodecs_private.h

@@ -55,6 +55,8 @@ extern HRESULT copy_pixels(UINT bpp, const BYTE *srcbuffer,
 
 extern void reverse_bgr8(UINT bytesperpixel, LPBYTE bits, UINT width, UINT height, INT stride) DECLSPEC_HIDDEN;
 
+extern HRESULT get_pixelformat_bpp(const GUID *pixelformat, UINT *bpp) DECLSPEC_HIDDEN;
+
 extern HRESULT CreatePropertyBag2(IPropertyBag2 **ppPropertyBag2) DECLSPEC_HIDDEN;
 
 extern HRESULT CreateComponentInfo(REFCLSID clsid, IWICComponentInfo **ppIInfo) DECLSPEC_HIDDEN;