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pixman: avoid unnecessary y-flip for screen capture 

Commit 4fc5dd0099 ("compositor: add capability CAPTURE_YFLIP")
introduced a capability flag which indicates whether y-flipping is
necessary. As already indicated in that commit message, it seems
that pixman flipps the y-axis only due to historic reasons.

Drop y-flipping and use the WESTON_CAP_CAPTURE_YFLIP flag to
indicate that y-flipping is not necessary. This simplifies code
and improves screen share performance (on my test by about 3% down
to 18% CPU load on the sharing instance of Weston).

Signed-off-by: Stefan Agner <stefan@agner.ch>
This commit is contained in:
Stefan Agner 2019-06-16 23:28:15 +02:00 committed by Simon Ser
parent b5c70d791a
commit da2e574ca9
1 changed files with 1 additions and 13 deletions
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14
libweston/pixman-renderer.c
View File

@ -97,7 +97,6 @@ pixman_renderer_read_pixels(struct weston_output *output,
uint32_t width, uint32_t height)
{
struct pixman_output_state *po = get_output_state(output);
pixman_transform_t transform;
pixman_image_t *out_buf;
if (!po->hw_buffer) {
@ -111,25 +110,15 @@ pixman_renderer_read_pixels(struct weston_output *output,
pixels,
(PIXMAN_FORMAT_BPP(format) / 8) * width);
/* Caller expects vflipped source image */
pixman_transform_init_translate(&transform,
pixman_int_to_fixed (x),
pixman_int_to_fixed (y - pixman_image_get_height (po->hw_buffer)));
pixman_transform_scale(&transform, NULL,
pixman_fixed_1,
pixman_fixed_minus_1);
pixman_image_set_transform(po->hw_buffer, &transform);
pixman_image_composite32(PIXMAN_OP_SRC,
po->hw_buffer, /* src */
NULL /* mask */,
out_buf, /* dest */
0, 0, /* src_x, src_y */
x, y, /* src_x, src_y */
0, 0, /* mask_x, mask_y */
0, 0, /* dest_x, dest_y */
pixman_image_get_width (po->hw_buffer), /* width */
pixman_image_get_height (po->hw_buffer) /* height */);
pixman_image_set_transform(po->hw_buffer, NULL);
pixman_image_unref(out_buf);
@ -883,7 +872,6 @@ pixman_renderer_init(struct weston_compositor *ec)
pixman_renderer_surface_copy_content;
ec->renderer = &renderer->base;
ec->capabilities |= WESTON_CAP_ROTATION_ANY;
ec->capabilities |= WESTON_CAP_CAPTURE_YFLIP;
ec->capabilities |= WESTON_CAP_VIEW_CLIP_MASK;
renderer->debug_binding =