Figured out how to render ARGB bitmaps.

cosinekitty · cosinekitty · commit 5e3ce4015a23 · 2021-05-02T13:35:44.000-04:00
I finally figured out how to render the new bitmaps
that have transparent areas inside them.
Remaining tasks:

- Render the light and dark squares beneath the pieces.
- Be able to render a question mark for promotion.
diff --git a/res/winchen.rc b/res/winchen.rc
@@ -37,7 +37,7 @@ IDB_BP            BITMAP              "..\images\bp.bmp"
 IDB_BQ            BITMAP              "..\images\bq.bmp"
 IDB_BR            BITMAP              "..\images\br.bmp"
 IDB_WB            BITMAP              "..\images\wb.bmp"
-IDB_WK            BITMAP              "..\images\bk.bmp"
+IDB_WK            BITMAP              "..\images\wk.bmp"
 IDB_WN            BITMAP              "..\images\wn.bmp"
 IDB_WP            BITMAP              "..\images\wp.bmp"
 IDB_WQ            BITMAP              "..\images\wq.bmp"
diff --git a/src/wbrdbuf.cpp b/src/wbrdbuf.cpp
@@ -166,13 +166,19 @@ void DrawBitmap (
     ptOrg.y = 0;
     DPtoLP ( hdcMem, &ptOrg, 1 );
 
-    StretchBlt (
+    BLENDFUNCTION blend;
+    blend.BlendOp = AC_SRC_OVER;
+    blend.BlendFlags = 0x00;
+    blend.SourceConstantAlpha = 0xff;
+    blend.AlphaFormat = AC_SRC_ALPHA;
+
+    AlphaBlend (
         hdc, xStart, yStart,
         (BitmapScaleFactor * ptSize.x) / BitmapScaleDenom,
         (BitmapScaleFactor * ptSize.y) / BitmapScaleDenom,
         hdcMem, ptOrg.x, ptOrg.y,
         ptSize.x, ptSize.y,
-        SRCCOPY );
+        blend);
 
     DeleteDC (hdcMem);
 }
@@ -251,7 +257,7 @@ void BoardDisplayBuffer::drawSquare (
     }
 
     if (hdc != NULL)
-        DrawBitmap ( hdc, hbm, xStart, yStart );
+        DrawBitmap(hdc, hbm, xStart, yStart);
 
     if ( selX == x && selY == y )
     {
diff --git a/winchen/winchen.vcxproj b/winchen/winchen.vcxproj
@@ -100,7 +100,7 @@
       <DebugInformationFormat>EditAndContinue</DebugInformationFormat>
     </ClCompile>
     <Link>
-      <AdditionalDependencies>wsock32.lib;winmm.lib;odbc32.lib;odbccp32.lib;%(AdditionalDependencies)</AdditionalDependencies>
+      <AdditionalDependencies>wsock32.lib;winmm.lib;odbc32.lib;odbccp32.lib;msimg32.lib;%(AdditionalDependencies)</AdditionalDependencies>
       <GenerateDebugInformation>true</GenerateDebugInformation>
       <SubSystem>Windows</SubSystem>
       <TargetMachine>MachineX86</TargetMachine>
@@ -123,7 +123,7 @@
       <DebugInformationFormat>ProgramDatabase</DebugInformationFormat>
     </ClCompile>
     <Link>
-      <AdditionalDependencies>wsock32.lib;winmm.lib;odbc32.lib;odbccp32.lib;%(AdditionalDependencies)</AdditionalDependencies>
+      <AdditionalDependencies>wsock32.lib;winmm.lib;odbc32.lib;odbccp32.lib;msimg32.lib;%(AdditionalDependencies)</AdditionalDependencies>
       <GenerateDebugInformation>true</GenerateDebugInformation>
       <SubSystem>Windows</SubSystem>
       <TargetMachine>MachineX64</TargetMachine>
@@ -143,7 +143,7 @@
       <DebugInformationFormat>ProgramDatabase</DebugInformationFormat>
     </ClCompile>
     <Link>
-      <AdditionalDependencies>wsock32.lib;winmm.lib;odbc32.lib;odbccp32.lib;%(AdditionalDependencies)</AdditionalDependencies>
+      <AdditionalDependencies>wsock32.lib;winmm.lib;odbc32.lib;odbccp32.lib;msimg32.lib;%(AdditionalDependencies)</AdditionalDependencies>
       <GenerateDebugInformation>true</GenerateDebugInformation>
       <SubSystem>Windows</SubSystem>
       <OptimizeReferences>true</OptimizeReferences>
@@ -168,7 +168,7 @@
       <DebugInformationFormat>ProgramDatabase</DebugInformationFormat>
     </ClCompile>
     <Link>
-      <AdditionalDependencies>wsock32.lib;winmm.lib;odbc32.lib;odbccp32.lib;%(AdditionalDependencies)</AdditionalDependencies>
+      <AdditionalDependencies>wsock32.lib;winmm.lib;odbc32.lib;odbccp32.lib;msimg32.lib;%(AdditionalDependencies)</AdditionalDependencies>
       <GenerateDebugInformation>true</GenerateDebugInformation>
       <SubSystem>Windows</SubSystem>
       <OptimizeReferences>true</OptimizeReferences>
