hwc: Add support for clearing with c2d
When blending translucent layers or transitioning with c2d,
sometimes the frame is blended with stale framebuffer content.
Clear the frame with C2D fill surface before drawing.
CRs-fixed: 462461
Change-Id: I1dca477fe88d77f4f0fa4846b155404f348e911d
diff --git a/libhwcomposer/hwc_copybit.cpp b/libhwcomposer/hwc_copybit.cpp
index 4549dcf..aa05aa9 100644
--- a/libhwcomposer/hwc_copybit.cpp
+++ b/libhwcomposer/hwc_copybit.cpp
@@ -201,6 +201,25 @@
return true;
}
+int CopyBit::clear (private_handle_t* hnd, hwc_rect_t& rect)
+{
+ int ret = 0;
+ copybit_rect_t clear_rect = {rect.left, rect.top,
+ rect.right,
+ rect.bottom};
+
+ copybit_image_t buf;
+ buf.w = ALIGN(hnd->width,32);
+ buf.h = hnd->height;
+ buf.format = hnd->format;
+ buf.base = (void *)hnd->base;
+ buf.handle = (native_handle_t *)hnd;
+
+ copybit_device_t *copybit = mEngine;
+ ret = copybit->clear(copybit, &buf, &clear_rect);
+ return ret;
+}
+
bool CopyBit::draw(hwc_context_t *ctx, hwc_display_contents_1_t *list,
int dpy, int32_t *fd) {
// draw layers marked for COPYBIT
@@ -224,6 +243,12 @@
close(mRelFd[0]);
mRelFd[0] = -1;
}
+
+ //Clear the visible region on the render buffer
+ //XXX: Do this only when needed.
+ hwc_rect_t clearRegion;
+ getNonWormholeRegion(list, clearRegion);
+ clear(renderBuffer, clearRegion);
// numAppLayers-1, as we iterate from 0th layer index with HWC_COPYBIT flag
for (int i = 0; i <= (ctx->listStats[dpy].numAppLayers-1); i++) {
hwc_layer_1_t *layer = &list->hwLayers[i];