diff options
Diffstat (limited to 'main/xorg-server/glamor-upstream-fix.patch')
| -rw-r--r-- | main/xorg-server/glamor-upstream-fix.patch | 178 |
1 files changed, 178 insertions, 0 deletions
diff --git a/main/xorg-server/glamor-upstream-fix.patch b/main/xorg-server/glamor-upstream-fix.patch new file mode 100644 index 0000000000..89dd4d0176 --- /dev/null +++ b/main/xorg-server/glamor-upstream-fix.patch @@ -0,0 +1,178 @@ +From 3c0431b8911241552a15a43e4279c50658b50a18 Mon Sep 17 00:00:00 2001 +From: Keith Packard <keithp@keithp.com> +Date: Wed, 16 Jul 2014 23:03:23 +0000 +Subject: glamor: Fix temp picture coordinates in glamor_composite_clipped_region + +To understand this patch, let's start at the protocol interface where +the relationship between the coordinate spaces is documented: + + static Bool + _glamor_composite(CARD8 op, + PicturePtr source, + PicturePtr mask, + PicturePtr dest, + INT16 x_source, + INT16 y_source, + INT16 x_mask, + INT16 y_mask, + INT16 x_dest, INT16 y_dest, + CARD16 width, CARD16 height, Bool fallback) + +The coordinates are passed to this function directly off the wire and +are all relative to their respective drawables. For Windows, this means +that they are relative to the upper left corner of the window, in +whatever pixmap that window is getting drawn to. + +_glamor_composite calls miComputeCompositeRegion to construct a clipped +region to actually render to. In reality, miComputeCompositeRegion clips +only to the destination these days; source clip region based clipping +would have to respect the transform, which isn't really possible. The +returned region is relative to the screen in which dest lives; offset by +dest->drawable.x and dest->drawable.y. + +What is important to realize here is that, because of clipping, the +composite region may not have the same position within the destination +drawable as x_dest, y_dest. The protocol coordinates now exist solely to +'pin' the three objects together. + + extents->x1,y1 Screen origin of clipped operation + width,height Extents of the clipped operation + x_dest,y_dest Unclipped destination-relative operation coordinate + x_source,y_source Unclipped source-relative operation coordinate + x_mask,y_mask Unclipped mask-relative operation coordinate + +One thing we want to know is what the offset is from the original +operation origin to the clipped origin + + Destination drawable relative coordinates of the clipped operation: + + x_dest_clipped = extents->x1 - dest->drawable.x + y_dest_clipped = extents->y1 - dest->drawable.y + + Offset from the original operation origin: + + x_off_clipped = x_dest_clipped - x_dest + y_off_clipped = y_dest_clipped - y_dest + + Source drawable relative coordinates of the clipped operation: + + x_source_clipped = x_source + x_off_clipped; + y_source_clipped = y_source + y_off_clipped; + + Mask drawable relative coordinates of the clipped operation: + + x_mask_clipped = x_source + x_off_clipped; + y_mask_clipped = y_source + y_off_clipped; + +This is where the original code fails -- it doesn't subtract the +destination drawable location when computing the distance that the +operation has been moved by clipping. Here's what it does when +constructing a temporary source picture: + + temp_src = + glamor_convert_gradient_picture(screen, source, + extent->x1 + x_source - x_dest, + extent->y1 + y_source - y_dest, + width, height); + ... + x_temp_src = -extent->x1 + x_dest; + y_temp_src = -extent->y1 + y_dest; + +glamor_convert_gradient_picture needs source drawable relative +coordinates, but that is not what it's getting; it's getting +screen-relative coordinates for the destination, adjusted by the +distance between the provided source and destination operation +coordinates. We want x_source_clipped and y_source_clipped: + + x_source_clipped = x_source + x_off_clipped + = x_source + x_dest_clipped - x_dest + = x_source + extents->x1 - dest->drawable.x - x_dest + +x_temp_src/y_temp_src are supposed to be the coordinates of the original +operation translated to the temporary picture: + + x_temp_src = x_source - x_source_clipped; + y_temp_src = y_source - y_source_clipped; + +Note that x_source_clipped/y_source_clipped will never be less than +x_source/y_source because all we're doing is clipping. This means that +x_temp_src/y_temp_src will always be non-positive; the original source +coordinate can never be strictly *inside* the temporary image or we +could have made the temporary image smaller. + + x_temp_src = x_source - x_source_clipped + = x_source - (x_source + x_off_clipped) + = -x_off_clipped + = x_dest - x_dest_clipped + = x_dest - (extents->x1 - dest->drawable.x) + +Again, this is off by the destination origin within the screen +coordinate space. + +The code should look like: + + temp_src = + glamor_convert_gradient_picture(screen, source, + extent->x1 + x_source - x_dest - dest->pDrawable->x, + extent->y1 + y_source - y_dest - dest->pDrawable->y, + width, height); + + x_temp_src = -extent->x1 + x_dest + dest->pDrawable->x; + y_temp_src = -extent->y1 + y_dest + dest->pDrawable->y; + +Signed-off-by: Keith Packard <keithp@keithp.com> +Reviewed-by: Markus Wick <markus@selfnet.de> +(cherry picked from commit 55f5bfb578e934319d1308cbb56c900c5ac7cfa7) +Signed-off-by: Julien Cristau <jcristau@debian.org> +--- +diff --git a/glamor/glamor_render.c b/glamor/glamor_render.c +index 14ab738..e5d5d2c 100644 +--- a/glamor/glamor_render.c ++++ b/glamor/glamor_render.c +@@ -1450,8 +1450,8 @@ glamor_composite_clipped_region(CARD8 op, + || source_pixmap->drawable.height != height)))) { + temp_src = + glamor_convert_gradient_picture(screen, source, +- extent->x1 + x_source - x_dest, +- extent->y1 + y_source - y_dest, ++ extent->x1 + x_source - x_dest - dest->pDrawable->x, ++ extent->y1 + y_source - y_dest - dest->pDrawable->y, + width, height); + if (!temp_src) { + temp_src = source; +@@ -1459,8 +1459,8 @@ glamor_composite_clipped_region(CARD8 op, + } + temp_src_priv = + glamor_get_pixmap_private((PixmapPtr) (temp_src->pDrawable)); +- x_temp_src = -extent->x1 + x_dest; +- y_temp_src = -extent->y1 + y_dest; ++ x_temp_src = -extent->x1 + x_dest + dest->pDrawable->x; ++ y_temp_src = -extent->y1 + y_dest + dest->pDrawable->y; + } + + if (mask +@@ -1474,8 +1474,8 @@ glamor_composite_clipped_region(CARD8 op, + * to do reduce one convertion. */ + temp_mask = + glamor_convert_gradient_picture(screen, mask, +- extent->x1 + x_mask - x_dest, +- extent->y1 + y_mask - y_dest, ++ extent->x1 + x_mask - x_dest - dest->pDrawable->x, ++ extent->y1 + y_mask - y_dest - dest->pDrawable->y, + width, height); + if (!temp_mask) { + temp_mask = mask; +@@ -1483,8 +1483,8 @@ glamor_composite_clipped_region(CARD8 op, + } + temp_mask_priv = + glamor_get_pixmap_private((PixmapPtr) (temp_mask->pDrawable)); +- x_temp_mask = -extent->x1 + x_dest; +- y_temp_mask = -extent->y1 + y_dest; ++ x_temp_mask = -extent->x1 + x_dest + dest->pDrawable->x; ++ y_temp_mask = -extent->y1 + y_dest + dest->pDrawable->y; + } + /* Do two-pass PictOpOver componentAlpha, until we enable + * dual source color blending. +-- +cgit v0.9.0.2-2-gbebe + |