glamor_set_destination_pixmap_priv_nc: set drawable's width x height.

Previous implementation set the whole fbo's width and height as the
viewpoint. This may increase the numerical error as we may only has
a partial region as the valid pixmap. So add a new marco
pixmap_priv_get_dest_scale to get proper scale factor for the
destination pixmap. For the source/mask pixmap, we still need to
consider the whole fbo's size.

Signed-off-by: Zhigang Gong <zhigang.gong@linux.intel.com>

glamor/glamor_copyarea.c

@@ -183,7 +183,7 @@ glamor_copy_n_to_n_textured(DrawablePtr src,
 		alu = gc->alu;
 	}
 
-	pixmap_priv_get_scale(dst_pixmap_priv, &dst_xscale, &dst_yscale);
+	pixmap_priv_get_dest_scale(dst_pixmap_priv, &dst_xscale, &dst_yscale);
 	pixmap_priv_get_scale(src_pixmap_priv, &src_xscale, &src_yscale);
 
 	glamor_get_drawable_deltas(dst, dst_pixmap, &dst_x_off,
@@ -206,8 +206,6 @@ glamor_copy_n_to_n_textured(DrawablePtr src,
 				   &src_y_off);
 	dx += src_x_off;
 	dy += src_y_off;
-	pixmap_priv_get_scale(src_pixmap_priv, &src_xscale,
-			      &src_yscale);
 
 	dispatch->glActiveTexture(GL_TEXTURE0);
 	dispatch->glBindTexture(GL_TEXTURE_2D,

glamor/glamor_fill.c

@@ -237,7 +237,7 @@ glamor_solid(PixmapPtr pixmap, int x, int y, int width, int height,
 					GL_FALSE, 2 * sizeof(float),
 					vertices);
 	dispatch->glEnableVertexAttribArray(GLAMOR_VERTEX_POS);
-	pixmap_priv_get_scale(pixmap_priv, &xscale, &yscale);
+	pixmap_priv_get_dest_scale(pixmap_priv, &xscale, &yscale);
 
 	glamor_set_normalize_vcoords(xscale, yscale, x1, y1, x2, y2,
 				     glamor_priv->yInverted, vertices);

glamor/glamor_pixmap.c

@@ -64,7 +64,7 @@ glamor_pixmap_fini(ScreenPtr screen)
 }
 
 void
-glamor_set_destination_pixmap_fbo(glamor_pixmap_fbo * fbo)
+glamor_set_destination_pixmap_fbo(glamor_pixmap_fbo * fbo, int x0, int y0, int width, int height)
 {
 	glamor_gl_dispatch *dispatch = glamor_get_dispatch(fbo->glamor_priv);
 	dispatch->glBindFramebuffer(GL_FRAMEBUFFER, fbo->fb);
@@ -74,9 +74,8 @@ glamor_set_destination_pixmap_fbo(glamor_pixmap_fbo * fbo)
 	dispatch->glMatrixMode(GL_MODELVIEW);
 	dispatch->glLoadIdentity();
 #endif
-	dispatch->glViewport(0, 0,
-			     fbo->width,
-			     fbo->height);
+	dispatch->glViewport(x0, y0,
+			     width, height);
 
 	glamor_put_dispatch(fbo->glamor_priv);
 }
@@ -84,7 +83,9 @@ glamor_set_destination_pixmap_fbo(glamor_pixmap_fbo * fbo)
 void
 glamor_set_destination_pixmap_priv_nc(glamor_pixmap_private * pixmap_priv)
 {
-	glamor_set_destination_pixmap_fbo(pixmap_priv->fbo);
+	glamor_set_destination_pixmap_fbo(pixmap_priv->fbo, 0, 0,
+					  pixmap_priv->container->drawable.width,
+					  pixmap_priv->container->drawable.height);
 }
 
 int
@@ -507,7 +508,7 @@ ready_to_upload:
 	else
 		ptexcoords = texcoords_inv;
 
-	pixmap_priv_get_scale(pixmap_priv, &dst_xscale, &dst_yscale);
+	pixmap_priv_get_dest_scale(pixmap_priv, &dst_xscale, &dst_yscale);
 	glamor_set_normalize_vcoords(dst_xscale,
 				     dst_yscale,
 				     x, y,
@@ -733,8 +734,8 @@ glamor_es2_pixmap_read_prepare(PixmapPtr source, int x, int y, int w, int h, GLe
 		return NULL;
 
 	dispatch = glamor_get_dispatch(glamor_priv);
-	temp_xscale = 1.0 / temp_fbo->width;
-	temp_yscale = 1.0 / temp_fbo->height;
+	temp_xscale = 1.0 / w;
+	temp_yscale = 1.0 / h;
 
 	glamor_set_normalize_vcoords(temp_xscale,
 				     temp_yscale,
@@ -770,7 +771,7 @@ glamor_es2_pixmap_read_prepare(PixmapPtr source, int x, int y, int w, int h, GLe
 				  GL_TEXTURE_MAG_FILTER,
 				  GL_NEAREST);
 
-	glamor_set_destination_pixmap_fbo(temp_fbo);
+	glamor_set_destination_pixmap_fbo(temp_fbo, 0, 0, w, h);
 	dispatch->glUseProgram(glamor_priv->finish_access_prog[no_alpha]);
 	dispatch->glUniform1i(glamor_priv->
 			      finish_access_revert[no_alpha],

glamor/glamor_priv.h

@@ -456,7 +456,7 @@ void glamor_get_color_4f_from_pixel(PixmapPtr pixmap,
 int glamor_set_destination_pixmap(PixmapPtr pixmap);
 int glamor_set_destination_pixmap_priv(glamor_pixmap_private *
 				       pixmap_priv);
-void glamor_set_destination_pixmap_fbo(glamor_pixmap_fbo *);
+void glamor_set_destination_pixmap_fbo(glamor_pixmap_fbo *, int, int, int, int);
 
 /* nc means no check. caller must ensure this pixmap has valid fbo.
  * usually use the GLAMOR_PIXMAP_PRIV_HAS_FBO firstly. 

glamor/glamor_render.c

@@ -1210,7 +1210,7 @@ glamor_composite_with_shader(CARD8 op,
 
 	glamor_get_drawable_deltas(dest->pDrawable, dest_pixmap,
 				   &dest_x_off, &dest_y_off);
-	pixmap_priv_get_scale(dest_pixmap_priv, &dst_xscale, &dst_yscale);
+	pixmap_priv_get_dest_scale(dest_pixmap_priv, &dst_xscale, &dst_yscale);
 
 	if (glamor_priv->has_source_coords) {
 		glamor_get_drawable_deltas(source->pDrawable,
@@ -2109,7 +2109,7 @@ _glamor_gradient_set_pixmap_destination(ScreenPtr screen,
 
 	glamor_set_destination_pixmap_priv_nc(pixmap_priv);
 
-	pixmap_priv_get_scale(pixmap_priv, xscale, yscale);
+	pixmap_priv_get_dest_scale(pixmap_priv, xscale, yscale);
 
 	glamor_priv->has_source_coords = 1;
 	glamor_priv->has_mask_coords = 0;

glamor/glamor_tile.c

@@ -154,7 +154,7 @@ glamor_tile(PixmapPtr pixmap, PixmapPtr tile,
 	}
 
 	glamor_set_destination_pixmap_priv_nc(dst_pixmap_priv);
-	pixmap_priv_get_scale(dst_pixmap_priv, &dst_xscale, &dst_yscale);
+	pixmap_priv_get_dest_scale(dst_pixmap_priv, &dst_xscale, &dst_yscale);
 
 	dispatch = glamor_get_dispatch(glamor_priv);
 	if (!glamor_set_alu(dispatch, alu)) {

glamor/glamor_utils.h

@@ -39,6 +39,12 @@
 #define t_from_x_coord_y(_yscale_, _y_)          (1.0 - (_y_) * (_yscale_))
 #define t_from_x_coord_y_inverted(_yscale_, _y_) ((_y_) * (_yscale_))
 
+#define pixmap_priv_get_dest_scale(_pixmap_priv_, _pxscale_, _pyscale_)	\
+   do {									\
+    *(_pxscale_) = 1.0 / (_pixmap_priv_)->container->drawable.width;	\
+    *(_pyscale_) = 1.0 / (_pixmap_priv_)->container->drawable.height;	\
+  } while(0)
+
 #define pixmap_priv_get_scale(_pixmap_priv_, _pxscale_, _pyscale_)	\
    do {									\
     *(_pxscale_) = 1.0 / (_pixmap_priv_)->fbo->width;			\