From efab4226b00b92200d291b0cd2dab2335dd9d3f9 Mon Sep 17 00:00:00 2001
From: Vincent Povirk <vincent@codeweavers.com>
Date: Thu, 13 Aug 2009 14:01:39 -0500
Subject: [PATCH] windowscodecs: implement conversion from 4bppIndexed to 32bppBGRA

---
 dlls/windowscodecs/converter.c |   59 ++++++++++++++++++++++++++++++++++++++++
 dlls/windowscodecs/regsvr.c    |    1 +
 2 files changed, 60 insertions(+), 0 deletions(-)

diff --git a/dlls/windowscodecs/converter.c b/dlls/windowscodecs/converter.c
index 2c9fccc..afcd957 100644
--- a/dlls/windowscodecs/converter.c
+++ b/dlls/windowscodecs/converter.c
@@ -37,6 +37,7 @@ struct FormatConverter;
 
 enum pixelformat {
     format_1bppIndexed,
+    format_4bppIndexed,
     format_16bppBGR555,
     format_16bppBGR565,
     format_24bppBGR,
@@ -131,6 +132,63 @@ static HRESULT copypixels_to_32bppBGRA(struct FormatConverter *This, const WICRe
             return res;
         }
         return S_OK;
+    case format_4bppIndexed:
+        if (prc)
+        {
+            HRESULT res;
+            UINT x, y;
+            BYTE *srcdata;
+            UINT srcstride, srcdatasize;
+            const BYTE *srcrow;
+            const BYTE *srcbyte;
+            BYTE *dstrow;
+            DWORD *dstpixel;
+            WICColor colors[16];
+            IWICPalette *palette;
+            UINT actualcolors;
+
+            res = PaletteImpl_Create(&palette);
+            if (FAILED(res)) return res;
+
+            res = IWICBitmapSource_CopyPalette(This->source, palette);
+            if (SUCCEEDED(res))
+                res = IWICPalette_GetColors(palette, 16, colors, &actualcolors);
+
+            IWICPalette_Release(palette);
+
+            if (FAILED(res)) return res;
+
+            srcstride = (prc->Width+1)/2;
+            srcdatasize = srcstride * prc->Height;
+
+            srcdata = HeapAlloc(GetProcessHeap(), 0, srcdatasize);
+            if (!srcdata) return E_OUTOFMEMORY;
+
+            res = IWICBitmapSource_CopyPixels(This->source, prc, srcstride, srcdatasize, srcdata);
+
+            if (SUCCEEDED(res))
+            {
+                srcrow = srcdata;
+                dstrow = pbBuffer;
+                for (y=0; y<prc->Height; y++) {
+                    srcbyte=(const BYTE*)srcrow;
+                    dstpixel=(DWORD*)dstrow;
+                    for (x=0; x<prc->Width; x+=2) {
+                        BYTE srcval;
+                        srcval=*srcbyte++;
+                        *dstpixel++ = colors[srcval>>4];
+                        if (x+1 < prc->Width) *dstpixel++ = colors[srcval&0xf];
+                    }
+                    srcrow += srcstride;
+                    dstrow += cbStride;
+                }
+            }
+
+            HeapFree(GetProcessHeap(), 0, srcdata);
+
+            return res;
+        }
+        return S_OK;
     case format_16bppBGR555:
         if (prc)
         {
@@ -311,6 +369,7 @@ static HRESULT copypixels_to_32bppBGR(struct FormatConverter *This, const WICRec
 
 static const struct pixelformatinfo supported_formats[] = {
     {format_1bppIndexed, &GUID_WICPixelFormat1bppIndexed, NULL},
+    {format_4bppIndexed, &GUID_WICPixelFormat4bppIndexed, NULL},
     {format_16bppBGR555, &GUID_WICPixelFormat16bppBGR555, NULL},
     {format_16bppBGR565, &GUID_WICPixelFormat16bppBGR565, NULL},
     {format_24bppBGR, &GUID_WICPixelFormat24bppBGR, NULL},
diff --git a/dlls/windowscodecs/regsvr.c b/dlls/windowscodecs/regsvr.c
index 7c7d2cf..a95274e 100644
--- a/dlls/windowscodecs/regsvr.c
+++ b/dlls/windowscodecs/regsvr.c
@@ -790,6 +790,7 @@ static struct regsvr_decoder const decoder_list[] = {
 
 static GUID const * const converter_formats[] = {
     &GUID_WICPixelFormat1bppIndexed,
+    &GUID_WICPixelFormat4bppIndexed,
     &GUID_WICPixelFormat16bppBGR555,
     &GUID_WICPixelFormat16bppBGR565,
     &GUID_WICPixelFormat24bppBGR,
-- 
1.5.4.3