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Generic C implementation of pixman_blt with overlapping support
This was ported from meta-oe's patch [1]:
Uses memcpy/memmove functions to copy pixels, can handle the
case when both source and destination areas are in the same
image (this is useful for scrolling).
It is assumed that copying direction is only important when
using the same image for both source and destination (and
src_stride == dst_stride). Copying direction is undefined
for the images with different source and destination stride
which happen to be in the overlapped areas (but this is an
unrealistic case anyway).
[1] http://cgit.openembedded.org/meta-openembedded/tree/meta-oe/recipes-graphics/xorg-lib/pixman-0.26.2/0008-Generic-C-implementation-of-pixman_blt-with-overlapp.patch
Upstream-Status: Pending
Signed-off-by: Andreas Müller <schnitzeltony@googlemail.com>
Signed-off-by: Constantin Musca <constantinx.musca@intel.com>
Index: pixman-0.28.0/pixman/pixman-general.c
===================================================================
--- pixman-0.28.0.orig/pixman/pixman-general.c
+++ pixman-0.28.0/pixman/pixman-general.c
@@ -214,6 +214,41 @@ static const pixman_fast_path_t general_
{ PIXMAN_OP_NONE }
};
+static pixman_bool_t
+general_blt (pixman_implementation_t *imp,
+ uint32_t * src_bits,
+ uint32_t * dst_bits,
+ int src_stride,
+ int dst_stride,
+ int src_bpp,
+ int dst_bpp,
+ int src_x,
+ int src_y,
+ int dest_x,
+ int dest_y,
+ int width,
+ int height)
+{
+ uint8_t *dst_bytes = (uint8_t *)dst_bits;
+ uint8_t *src_bytes = (uint8_t *)src_bits;
+ int bpp;
+
+ if (src_bpp != dst_bpp || src_bpp & 7)
+ return FALSE;
+
+ bpp = src_bpp >> 3;
+ width *= bpp;
+ src_stride *= 4;
+ dst_stride *= 4;
+ pixman_blt_helper (src_bytes + src_y * src_stride + src_x * bpp,
+ dst_bytes + dest_y * dst_stride + dest_x * bpp,
+ src_stride,
+ dst_stride,
+ width,
+ height);
+ return TRUE;
+}
+
pixman_implementation_t *
_pixman_implementation_create_general (void)
{
@@ -222,6 +257,7 @@ _pixman_implementation_create_general (v
_pixman_setup_combiner_functions_32 (imp);
_pixman_setup_combiner_functions_float (imp);
+ imp->blt = general_blt;
imp->src_iter_init = general_src_iter_init;
imp->dest_iter_init = general_dest_iter_init;
Index: pixman-0.28.0/pixman/pixman-private.h
===================================================================
--- pixman-0.28.0.orig/pixman/pixman-private.h
+++ pixman-0.28.0/pixman/pixman-private.h
@@ -1109,6 +1109,45 @@ void pixman_timer_register (pixman_timer
#endif /* PIXMAN_TIMERS */
+/* a helper function, can blit 8-bit images with src/dst overlapping support */
+static inline void
+pixman_blt_helper (uint8_t *src_bytes,
+ uint8_t *dst_bytes,
+ int src_stride,
+ int dst_stride,
+ int width,
+ int height)
+{
+ /*
+ * The second part of this check is not strictly needed, but it prevents
+ * unnecessary upside-down processing of areas which belong to different
+ * images. Upside-down processing can be slower with fixed-distance-ahead
+ * prefetch and perceived as having more tearing.
+ */
+ if (src_bytes < dst_bytes + width &&
+ src_bytes + src_stride * height > dst_bytes) {
+ src_bytes += src_stride * height - src_stride;
+ dst_bytes += dst_stride * height - dst_stride;
+ dst_stride = -dst_stride;
+ src_stride = -src_stride;
+
+ /* Horizontal scrolling to the left needs memmove */
+ if (src_bytes + width > dst_bytes) {
+ while (--height >= 0) {
+ memmove (dst_bytes, src_bytes, width);
+ dst_bytes += dst_stride;
+ src_bytes += src_stride;
+ }
+ return;
+ }
+ }
+ while (--height >= 0) {
+ memcpy (dst_bytes, src_bytes, width);
+ dst_bytes += dst_stride;
+ src_bytes += src_stride;
+ }
+}
+
#endif /* __ASSEMBLER__ */
#endif /* PIXMAN_PRIVATE_H */
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