fbaccel: implement partial blitting for SPARK

Blit only the parts of the screen that have changed. First
tests show better performance and no obvious errors. Might
still contain some bugs, you have been warned :-)


Origin commit data
------------------
Branch: ni/coolstream
Commit: d1573a510e
Author: Stefan Seyfried <seife@tuxbox-git.slipkontur.de>
Date: 2015-02-08 (Sun, 08 Feb 2015)



------------------
This commit was generated by Migit

src/driver/framebuffer_ng.cpp

@@ -670,6 +670,7 @@ void CFrameBuffer::paintBoxRel(const int x, const int y, const int dx, const int
 		line++;
 	}
 	checkFbArea(x, y, dx, dy, false);
+	accel->mark(x, y, x+dx, y+dy);
 }
 
 void CFrameBuffer::paintPixel(const int x, const int y, const fb_pixel_t col)
@@ -783,6 +784,7 @@ bool CFrameBuffer::paintIcon8(const std::string & filename, const int x, const i
 		d += stride;
 	}
 	close(lfd);
+	accel->mark(x, y, x + width, y + height);
 	accel->blit();
 	return true;
 }
@@ -1073,6 +1075,7 @@ void CFrameBuffer::paintBackgroundBoxRel(int x, int y, int dx, int dy)
 			bkpos += BACKGROUNDIMAGEWIDTH;
 		}
 		checkFbArea(x, y, dx, dy, false);
+		accel->mark(x, y, x + dx, y + dy);
 	}
 }
 
@@ -1088,6 +1091,7 @@ void CFrameBuffer::paintBackground()
 		for (int i = 0; i < 576; i++)
 			memmove(((uint8_t *)getFrameBufferPointer()) + i * stride, (background + i * BACKGROUNDIMAGEWIDTH), BACKGROUNDIMAGEWIDTH * sizeof(fb_pixel_t));
 		checkFbArea(0, 0, xRes, yRes, false);
+		accel->mark(0, 0, xRes, yRes);
 		accel->blit();
 	}
 	else
@@ -1138,6 +1142,7 @@ void CFrameBuffer::RestoreScreen(int x, int y, int dx, int dy, fb_pixel_t * cons
 		fbpos += stride;
 		bkpos += dx;
 	}
+	accel->mark(x, y, x + dx, y + dy);
 	accel->blit();
 	checkFbArea(x, y, dx, dy, false);
 }
@@ -1238,6 +1243,7 @@ void CFrameBuffer::blitBox2FB(const fb_pixel_t* boxBuf, uint32_t width, uint32_t
 		fbp += swidth;
 		line++;
 	}
+	accel->mark(xoff, yoff, xoff + width, xoff + height);
 
 	checkFbArea(xoff, yoff, width, height, false);
 }