implement getWidth4FB_HW_ACC in fb_accel class

This helper to determine alignment for hardware blitting is now in
system/helpers.h, where it does not really belong. Put it into the
framebuffer class instead. Framebuffers that don't need it will just
get a dummy function, the cs_hd2 framebuffer gets the real thing.
Also add a bool function that indicates the need for alignment.

src/driver/fb_accel.h

@@ -127,6 +127,8 @@ class CFbAccelCSHD2
 		void blitBox2FB(const fb_pixel_t* boxBuf, uint32_t width, uint32_t height, uint32_t xoff, uint32_t yoff);
 		void setBlendMode(uint8_t);
 		void setBlendLevel(int);
+		uint32_t getWidth4FB_HW_ACC(const uint32_t x, const uint32_t w, const bool max=true);
+		bool needAlign4Blit() { return true; };
 };
 
 class CFbAccelGLFB

src/driver/fb_accel_cs_hd2.cpp

@@ -228,3 +228,20 @@ void CFbAccelCSHD2::setBlendLevel(int level)
 	if (level == 100) // TODO: sucks.
 		usleep(20000);
 }
+
+/* align for hw blit */
+uint32_t CFbAccelCSHD2::getWidth4FB_HW_ACC(const uint32_t _x, const uint32_t _w, const bool max)
+{
+	uint32_t ret = _w;
+	if ((_x + ret) >= xRes)
+		ret = xRes-_x-1;
+	if (ret%4 == 0)
+		return ret;
+
+	int add = (max) ? 3 : 0;
+	ret = ((ret + add) / 4) * 4;
+	if ((_x + ret) >= xRes)
+		ret -= 4;
+
+	return ret;
+}

src/driver/fb_generic.cpp

@@ -48,7 +48,6 @@
 #include <gui/color.h>
 #include <gui/pictureviewer.h>
 #include <system/debug.h>
-#include <system/helpers.h>
 #include <global.h>
 #include <video.h>
 #include <cs_api.h>
@@ -514,7 +513,7 @@ fb_pixel_t* CFrameBuffer::paintBoxRel(const int x, const int y, const int dx, co
 
 #ifdef BOXMODEL_CS_HD2
 	if (_dx%4 != 0) {
-		w_align = GetWidth4FB_HW_ACC(x, _dx, true);
+		w_align = getWidth4FB_HW_ACC(x, _dx, true);
 		if (w_align < _dx)
 			_dx = w_align;
 		offs_align = w_align - _dx;
@@ -1770,3 +1769,8 @@ bool CFrameBuffer::_checkFbArea(int _x, int _y, int _dx, int _dy, bool prev)
 void CFrameBuffer::mark(int , int , int , int )
 {
 }
+
+uint32_t CFrameBuffer::getWidth4FB_HW_ACC(const uint32_t /*x*/, const uint32_t w, const bool /*max*/)
+{
+	return w;
+}

src/driver/fb_generic.h

@@ -185,6 +185,8 @@ class CFrameBuffer : public sigc::trackable
 		bool getActive() const;                     // is framebuffer active?
 		void setActive(bool enable);                     // is framebuffer active?
 		virtual void setupGXA() { return; };             // reinitialize stuff
+		virtual bool needAlign4Blit() { return false; };
+		virtual uint32_t getWidth4FB_HW_ACC(const uint32_t x, const uint32_t w, const bool max=true);
 
 		void setTransparency( int tr = 0 );
 		virtual void setBlendMode(uint8_t mode = 1);