diff options
Diffstat (limited to 'recipes/xorg-lib/pixman/0003-Generic-C-implementation-of-pixman_blt-with-overlapp.patch')
| -rw-r--r-- | recipes/xorg-lib/pixman/0003-Generic-C-implementation-of-pixman_blt-with-overlapp.patch | 114 |
1 files changed, 114 insertions, 0 deletions
diff --git a/recipes/xorg-lib/pixman/0003-Generic-C-implementation-of-pixman_blt-with-overlapp.patch b/recipes/xorg-lib/pixman/0003-Generic-C-implementation-of-pixman_blt-with-overlapp.patch new file mode 100644 index 0000000000..25ce7ee3b8 --- /dev/null +++ b/recipes/xorg-lib/pixman/0003-Generic-C-implementation-of-pixman_blt-with-overlapp.patch @@ -0,0 +1,114 @@ +From c29c9fa826b7112156fd6150b5f1564227935c05 Mon Sep 17 00:00:00 2001 +From: Siarhei Siamashka <siarhei.siamashka@nokia.com> +Date: Thu, 22 Oct 2009 05:27:33 +0300 +Subject: [PATCH 3/6] Generic C implementation of pixman_blt with overlapping support + +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). +--- + pixman/pixman-general.c | 21 ++++++++++++++++++--- + pixman/pixman-private.h | 43 +++++++++++++++++++++++++++++++++++++++++++ + 2 files changed, 61 insertions(+), 3 deletions(-) + +diff --git a/pixman/pixman-general.c b/pixman/pixman-general.c +index c96a3f9..d71a299 100644 +--- a/pixman/pixman-general.c ++++ b/pixman/pixman-general.c +@@ -300,9 +300,24 @@ general_blt (pixman_implementation_t *imp, + int width, + int height) + { +- /* We can't blit unless we have sse2 or mmx */ +- +- return FALSE; ++ 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 + dst_y * dst_stride + dst_x * bpp, ++ src_stride, ++ dst_stride, ++ width, ++ height); ++ return TRUE; + } + + static pixman_bool_t +diff --git a/pixman/pixman-private.h b/pixman/pixman-private.h +index 5000f91..8c5d4fd 100644 +--- a/pixman/pixman-private.h ++++ b/pixman/pixman-private.h +@@ -10,6 +10,7 @@ + + #include "pixman.h" + #include <time.h> ++#include <string.h> + #include <assert.h> + + #include "pixman-compiler.h" +@@ -794,4 +795,46 @@ void pixman_timer_register (pixman_timer_t *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 /* PIXMAN_PRIVATE_H */ +-- +1.6.2.4 + |