wgltrace: Emit fake glBitmap on wglUseFontBitmapsA.

Basic implementation.
apitrace · Jan 28, 2016 · 10ab22a · 10ab22a
1 parent eb25879
commit 10ab22a
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diff --git a/wrappers/trace.py b/wrappers/trace.py
@@ -965,6 +965,7 @@ def emit_memcpy(self, ptr, size):
         print '    trace::fakeMemcpy(%s, %s);' % (ptr, size)
 
     def fake_call(self, function, args):
+        print '        {'
         print '            unsigned _fake_call = trace::localWriter.beginEnter(&_%s_sig, true);' % (function.name,)
         for arg, instance in zip(function.args, args):
             assert not arg.output
@@ -974,4 +975,5 @@ def fake_call(self, function, args):
         print '            trace::localWriter.endEnter();'
         print '            trace::localWriter.beginLeave(_fake_call);'
         print '            trace::localWriter.endLeave();'
+        print '        }'
 
diff --git a/wrappers/wgltrace.py b/wrappers/wgltrace.py
@@ -97,6 +97,63 @@ def traceFunctionImplBody(self, function):
             print '            gltrace::clearContext();'
             print '    }'
 
+        # Emit fake glBitmap calls in the trace on wglUseFontBitmapsA.
+        # This enables to capture the real bitmaps and replay them outside Windows.
+        #
+        # XXX: In spite what
+        # https://msdn.microsoft.com/en-us/library/windows/desktop/dd374392.aspx
+        # implies, GetGlyphOutline(GGO_BITMAP) does not seem to work with
+        # certain fonts.  The only solution is to draw the font charactors with
+        # a HBITMAP like the old Mesa fxwgl.c code used to do.  That too, seems
+        # to be the way that opengl32.dll implements wglUseFontBitmaps.
+        #
+        if function.name == 'wglUseFontBitmapsA':
+            glNewList = glapi.getFunctionByName('glNewList')
+            glBitmap = glapi.getFunctionByName('glBitmap')
+            glEndList = glapi.getFunctionByName('glEndList')
+
+            print r'    bool warned = false;'
+            print r'    for (DWORD i = 0; i < count; ++i) {'
+            self.fake_call(glNewList, ['listBase + i', 'GL_COMPILE'])
+
+            print r'        UINT uChar = first + i;'
+            print r'        GLYPHMETRICS gm;'
+            print r'        ZeroMemory(&gm, sizeof gm);'
+            print r'        static const MAT2 mat2 = {{0, 1}, {0, 0}, {0, 0}, {0, -1}};'
+            print r'        DWORD cbBuffer = GetGlyphOutlineA(hdc, uChar, GGO_BITMAP, &gm, 0, NULL, &mat2);'
+            print r'        if (cbBuffer == GDI_ERROR) {'
+            print r'            if (!warned) {'
+            print r'                os::log("apitrace: warning: wglUseFontBitmapsA: GetGlyphOutlineA failed\n");'
+            print r'                warned = true;'
+            print r'            }'
+            print r'        } else {'
+            print r'            LPVOID lpvBuffer = NULL;'
+            print r'            if (cbBuffer) {'
+            print r'                lpvBuffer =  malloc(cbBuffer);'
+            print r'                DWORD dwRet;'
+            print r'                dwRet = GetGlyphOutlineA(hdc, uChar, GGO_BITMAP, &gm, cbBuffer, lpvBuffer, &mat2);'
+            print r'                assert(dwRet != GDI_ERROR);'
+            print r'                assert(dwRet > 0);'
+            print r'            }'
+            print r'            GLsizei width  =  gm.gmBlackBoxX;'
+            print r'            GLfloat height =  gm.gmBlackBoxY;'
+            print r'            GLfloat xorig  = -gm.gmptGlyphOrigin.x;'
+            print r'            GLfloat yorig  =  gm.gmptGlyphOrigin.y;'
+            print r'            GLfloat xmove  =  gm.gmCellIncX;'
+            print r'            GLfloat ymove  =  gm.gmCellIncY;'
+            print r'            if (cbBuffer == 0) {'
+            print r'                // We still need to emit an empty glBitmap for empty characters like spaces;'
+            print r'                width = height = xorig = yorig = 0;'
+            print r'            }'
+            print r'            const GLubyte *bitmap = (const GLubyte *)lpvBuffer;'
+
+            self.fake_call(glBitmap, ['width', 'height', 'xorig', 'yorig', 'xmove', 'ymove', 'bitmap'])
+
+            print r'            free(lpvBuffer);'
+            print r'        }'
+            self.fake_call(glEndList, [])
+            print r'    }'
+
 
 if __name__ == '__main__':
     print