Split the prepare blitter functions into check + prepare.

Allow us to check whether we can handle the operation using the blitter
prior to doing any work.

Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>

src/i830_uxa.c

@@ -195,6 +195,35 @@ i830_uxa_pixmap_compute_size(PixmapPtr pixmap,
 	return size;
 }
 
+static Bool
+i830_uxa_check_solid(DrawablePtr drawable, int alu, Pixel planemask)
+{
+	ScrnInfoPtr scrn = xf86Screens[drawable->pScreen->myNum];
+	intel_screen_private *intel = intel_get_screen_private(scrn);
+
+	if (IS_GEN6(intel)) {
+		intel_debug_fallback(scrn,
+				     "Sandybridge BLT engine not supported\n");
+		return FALSE;
+	}
+
+	if (!UXA_PM_IS_SOLID(drawable, planemask)) {
+		intel_debug_fallback(scrn, "planemask is not solid\n");
+		return FALSE;
+	}
+
+	switch (drawable->bitsPerPixel) {
+	case 8:
+	case 16:
+	case 32:
+		break;
+	default:
+		return FALSE;
+	}
+
+	return TRUE;
+}
+
 /**
  * Sets up hardware state for a series of solid fills.
  */
@@ -208,27 +237,6 @@ i830_uxa_prepare_solid(PixmapPtr pixmap, int alu, Pixel planemask, Pixel fg)
 		i830_get_pixmap_bo(pixmap),
 	};
 
-	if (IS_GEN6(intel)) {
-		intel_debug_fallback(scrn,
-				     "Sandybridge BLT engine not supported\n");
-		return FALSE;
-	}
-
-	if (!UXA_PM_IS_SOLID(&pixmap->drawable, planemask)) {
-		intel_debug_fallback(scrn, "planemask is not solid\n");
-		return FALSE;
-	}
-
-	if (pixmap->drawable.bitsPerPixel == 24) {
-		intel_debug_fallback(scrn, "solid 24bpp unsupported!\n");
-		return FALSE;
-	}
-
-	if (pixmap->drawable.bitsPerPixel < 8) {
-		intel_debug_fallback(scrn, "under 8bpp pixmaps unsupported\n");
-		return FALSE;
-	}
-
 	if (!intel_check_pitch_2d(pixmap))
 		return FALSE;
 
@@ -251,11 +259,10 @@ i830_uxa_prepare_solid(PixmapPtr pixmap, int alu, Pixel planemask, Pixel fg)
 	case 32:
 		/* RGB8888 */
 		intel->BR[13] |= ((1 << 24) | (1 << 25));
-		if (pixmap->drawable.depth == 24)
-		    fg |= 0xff000000;
 		break;
 	}
 	intel->BR[16] = fg;
+
 	return TRUE;
 }
 
@@ -315,6 +322,40 @@ static void i830_uxa_done_solid(PixmapPtr pixmap)
  * TODO:
  *   - support planemask using FULL_BLT_CMD?
  */
+static Bool
+i830_uxa_check_copy(DrawablePtr source, DrawablePtr dest,
+		    int alu, Pixel planemask)
+{
+	ScrnInfoPtr scrn = xf86Screens[dest->pScreen->myNum];
+	intel_screen_private *intel = intel_get_screen_private(scrn);
+
+	if (IS_GEN6(intel)) {
+		intel_debug_fallback(scrn,
+				     "Sandybridge BLT engine not supported\n");
+		return FALSE;
+	}
+
+	if (!UXA_PM_IS_SOLID(source, planemask)) {
+		intel_debug_fallback(scrn, "planemask is not solid");
+		return FALSE;
+	}
+
+	if (source->bitsPerPixel != dest->bitsPerPixel) {
+		intel_debug_fallback(scrn, "mixed bpp copies unsupported\n");
+		return FALSE;
+	}
+	switch (source->bitsPerPixel) {
+	case 8:
+	case 16:
+	case 32:
+		break;
+	default:
+		return FALSE;
+	}
+
+	return TRUE;
+}
+
 static Bool
 i830_uxa_prepare_copy(PixmapPtr source, PixmapPtr dest, int xdir,
 		      int ydir, int alu, Pixel planemask)
@@ -327,34 +368,17 @@ i830_uxa_prepare_copy(PixmapPtr source, PixmapPtr dest, int xdir,
 		i830_get_pixmap_bo(dest),
 	};
 
-	if (IS_GEN6(intel)) {
-		intel_debug_fallback(scrn,
-				     "Sandybridge BLT engine not supported\n");
-		return FALSE;
-	}
-
-	if (!UXA_PM_IS_SOLID(&source->drawable, planemask)) {
-		intel_debug_fallback(scrn, "planemask is not solid");
-		return FALSE;
-	}
-
-	if (dest->drawable.bitsPerPixel < 8) {
-		intel_debug_fallback(scrn, "under 8bpp pixmaps unsupported\n");
-		return FALSE;
-	}
-
-	if (!i830_get_aperture_space(scrn, bo_table, ARRAY_SIZE(bo_table)))
-		return FALSE;
-
 	if (!intel_check_pitch_2d(source))
 		return FALSE;
 	if (!intel_check_pitch_2d(dest))
 		return FALSE;
 
+	if (!i830_get_aperture_space(scrn, bo_table, ARRAY_SIZE(bo_table)))
+		return FALSE;
+
 	intel->render_source = source;
 
 	intel->BR[13] = I830CopyROP[alu] << 16;
-
 	switch (source->drawable.bitsPerPixel) {
 	case 8:
 		break;
@@ -365,6 +389,7 @@ i830_uxa_prepare_copy(PixmapPtr source, PixmapPtr dest, int xdir,
 		intel->BR[13] |= ((1 << 25) | (1 << 24));
 		break;
 	}
+
 	return TRUE;
 }
 
@@ -1056,11 +1081,13 @@ Bool i830_uxa_init(ScreenPtr screen)
 	intel->uxa_driver->uxa_minor = 0;
 
 	/* Solid fill */
+	intel->uxa_driver->check_solid = i830_uxa_check_solid;
 	intel->uxa_driver->prepare_solid = i830_uxa_prepare_solid;
 	intel->uxa_driver->solid = i830_uxa_solid;
 	intel->uxa_driver->done_solid = i830_uxa_done_solid;
 
 	/* Copy */
+	intel->uxa_driver->check_copy = i830_uxa_check_copy;
 	intel->uxa_driver->prepare_copy = i830_uxa_prepare_copy;
 	intel->uxa_driver->copy = i830_uxa_copy;
 	intel->uxa_driver->done_copy = i830_uxa_done_copy;

uxa/uxa-accel.c

@@ -433,8 +433,16 @@ uxa_copy_n_to_n(DrawablePtr pSrcDrawable,
 	int dst_off_x, dst_off_y;
 	PixmapPtr pSrcPixmap, pDstPixmap;
 
+	if (uxa_screen->info->check_copy &&
+	    !uxa_screen->info->check_copy(pSrcDrawable, pDstDrawable,
+					  pGC ? pGC->alu : GXcopy,
+					  pGC ? pGC->planemask : FB_ALLONES))
+		goto fallback;
+
 	pSrcPixmap = uxa_get_drawable_pixmap(pSrcDrawable);
 	pDstPixmap = uxa_get_drawable_pixmap(pDstDrawable);
+	if (!pSrcPixmap || !pDstPixmap)
+		goto fallback;
 
 	uxa_get_drawable_deltas(pSrcDrawable, pSrcPixmap, &src_off_x,
 				&src_off_y);
@@ -956,6 +964,11 @@ uxa_fill_region_tiled(DrawablePtr pDrawable,
 					     uxa_get_pixmap_first_pixel(pTile),
 					     planemask, alu);
 
+	if (uxa_screen->info->check_copy &&
+	    !uxa_screen->info->check_copy(&pTile->drawable, pDrawable, alu, planemask))
+		return FALSE;
+
+
 	pPixmap = uxa_get_drawable_pixmap(pDrawable);
 	uxa_get_drawable_deltas(pDrawable, pPixmap, &xoff, &yoff);
 	REGION_TRANSLATE(pScreen, pRegion, xoff, yoff);

uxa/uxa-render.c

@@ -349,7 +349,12 @@ uxa_try_driver_solid_fill(PicturePtr pSrc,
 	PixmapPtr pSrcPix = NULL, pDstPix;
 	CARD32 pixel;
 
-	pDstPix = uxa_get_drawable_pixmap(pDst->pDrawable);
+	if (uxa_screen->info->check_solid && !uxa_screen->info->check_solid(pDst->pDrawable, GXcopy, 0xffffffff))
+		return -1;
+
+	pDstPix = uxa_get_offscreen_pixmap(pDst->pDrawable, &dst_off_x, &dst_off_y);
+	if (!pDstPix)
+		return -1;
 
 	xDst += pDst->pDrawable->x;
 	yDst += pDst->pDrawable->y;
@@ -365,16 +370,8 @@ uxa_try_driver_solid_fill(PicturePtr pSrc,
 				      width, height))
 		return 1;
 
-	uxa_get_drawable_deltas(pDst->pDrawable, pDstPix, &dst_off_x,
-				&dst_off_y);
-
 	REGION_TRANSLATE(pScreen, &region, dst_off_x, dst_off_y);
 
-	if (!uxa_pixmap_is_offscreen(pDstPix)) {
-		REGION_UNINIT(pDst->pDrawable->pScreen, &region);
-		return 0;
-	}
-
 	if (pSrcPix) {
 		if (! uxa_get_color_for_pixmap (pSrcPix, pSrc->format, pDst->format, &pixel)) {
 			REGION_UNINIT(pDst->pDrawable->pScreen, &region);

uxa/uxa.h

@@ -73,6 +73,17 @@ typedef struct _UxaDriver {
 	/** @name solid
 	 * @{
 	 */
+	/**
+	 * check_solid() checks whether the driver can do a solid fill to this drawable.
+	 * @param pDrawable Destination drawable
+	 * @param alu raster operation
+	 * @param planemask write mask for the fill
+	 *
+	 * The check_solid() call is recommended if prepare_solid() is
+	 * implemented, but is not required.
+	 */
+	Bool(*check_solid) (DrawablePtr pDrawable, int alu, Pixel planemask);
+
 	/**
 	 * prepare_solid() sets up the driver for doing a solid fill.
 	 * @param pPixmap Destination pixmap
@@ -137,6 +148,12 @@ typedef struct _UxaDriver {
 	/** @name copy
 	 * @{
 	 */
+	/**
+	 * check_copy() checks whether the driver can blit between the two Pictures
+	 */
+	Bool(*check_copy) (DrawablePtr pSrcDrawable,
+			   DrawablePtr pDstDrawable,
+			   int alu, Pixel planemask);
 	/**
 	 * prepare_copy() sets up the driver for doing a copy within video
 	 * memory.