refactoring, speedup by decoupling back to front transferes from drawing and usage of special memcpy routine, minor speedups in Painter

git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@12437 a95241bf-73f2-0310-859d-f6bbb57e9c96
2005-04-18 16:09:43 +00:00
parent 300af26345
commit 74b3612ac3
7 changed files with 210 additions and 159 deletions
@@ -523,68 +523,8 @@ AccelerantHWInterface::BackBuffer() const
 void
 AccelerantHWInterface::_DrawCursor(BRect area) const
 {
-
-	BRect cf = _CursorFrame();
-	if (cf.IsValid() && area.Intersects(cf)) {
-		// clip to common area
-		area = area & cf;
-
-		int32 left = (int32)floorf(area.left);
-		int32 top = (int32)floorf(area.top);
-		int32 right = (int32)ceilf(area.right);
-		int32 bottom = (int32)ceilf(area.bottom);
-		int32 width = right - left + 1;
-		int32 height = bottom - top + 1;
-
-		// make a bitmap from the backbuffer
-		// that has the cursor blended on top of it
-
-		// blending buffer
-		uint8* buffer = new uint8[width * height * 4];
-
-		// offset into back buffer
-		uint8* src = (uint8*)fBackBuffer->Bits();
-		uint32 srcBPR = fBackBuffer->BytesPerRow();
-		src += top * srcBPR + left * 4;
-
-		// offset into cursor bitmap
-		uint8* crs = (uint8*)fCursor->Bits();
-		uint32 crsBPR = fCursor->BytesPerRow();
-		// since area is clipped to cf,
-		// the diff between top and cf.top is always positive,
-		// same for diff between left and cf.left
-		crs += (top - (int32)floorf(cf.top)) * crsBPR
-				+ (left - (int32)floorf(cf.left)) * 4;
-
-		uint8* dst = buffer;
-
-		// blending
-		for (int32 y = top; y <= bottom; y++) {
-			uint8* s = src;
-			uint8* c = crs;
-			uint8* d = dst;
-			for (int32 x = left; x <= right; x++) {
-				// assume backbuffer alpha = 255
-				// TODO: it appears alpha in cursor us upside down
-				uint8 a = 255 - c[3];
-				d[0] = (((s[0] - c[0]) * a) + (c[0] << 8)) >> 8;
-				d[1] = (((s[1] - c[1]) * a) + (c[1] << 8)) >> 8;
-				d[2] = (((s[2] - c[2]) * a) + (c[2] << 8)) >> 8;
-				d[3] = 255;
-				s += 4;
-				c += 4;
-				d += 4;
-			}
-			crs += crsBPR;
-			src += srcBPR;
-			dst += width * 4;
-		}
-
-		// copy result to front buffer
-		_CopyToFront(buffer, width * 4, left, top, right, bottom);
-
-		delete[] buffer;
-	}
-
+	// use the default implementation for now,
+	// until we have a hardware cursor
+	HWInterface::_DrawCursor(area);
 }