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new xrender: fix offset when using multi-pass blur 

Also makes the code a bit more readable by replacing stateful variables.

Signed-off-by: Yuxuan Shui <yshuiv7@gmail.com>
This commit is contained in:
Yuxuan Shui 2019-07-07 18:55:20 +01:00
parent 6d646b543f
commit 182a207afd
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GPG Key ID: 37C999F617EA1A47
1 changed files with 15 additions and 11 deletions
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26
src/backend/xrender/xrender.c
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@ -147,8 +147,6 @@ static bool blur(backend_t *backend_data, double opacity, void *ctx_,
const pixman_box32_t *extent = pixman_region32_extents(&reg_op);
const auto height = to_u16_checked(extent->y2 - extent->y1);
const auto width = to_u16_checked(extent->x2 - extent->x1);
auto src_x = to_i16_checked(extent->x1);
auto src_y = to_i16_checked(extent->y1);
static const char *filter0 = "Nearest"; // The "null" filter
static const char *filter = "convolution";
@ -169,7 +167,7 @@ static bool blur(backend_t *backend_data, double opacity, void *ctx_,
region_t clip;
pixman_region32_init(&clip);
pixman_region32_copy(&clip, &reg_op);
pixman_region32_translate(&clip, -src_x, -src_y);
pixman_region32_translate(&clip, -extent->x1, -extent->y1);
x_set_picture_clip_region(c, tmp_picture[0], 0, 0, &clip);
x_set_picture_clip_region(c, tmp_picture[1], 0, 0, &clip);
pixman_region32_fini(&clip);
@ -197,16 +195,24 @@ static bool blur(backend_t *backend_data, double opacity, void *ctx_,
to_u32_checked(bctx->x_blur_kernel[i]->size),
bctx->x_blur_kernel[i]->kernel);
if (i < bctx->x_blur_kernel_count - 1 || i == 0) {
// This is not the last pass, or this is the first pass
xcb_render_composite(c, XCB_RENDER_PICT_OP_SRC, src_pict,
XCB_NONE, dst_pict, src_x, src_y, 0, 0, 0, 0,
if (i == 0) {
// First pass, back buffer -> tmp picture
// (we do this even if this is also the last pass)
xcb_render_composite(c, XCB_RENDER_PICT_OP_SRC, src_pict, XCB_NONE,
dst_pict, to_i16_checked(extent->x1),
to_i16_checked(extent->y1), 0, 0, 0, 0,
width, height);
} else if (i < bctx->x_blur_kernel_count - 1) {
// This is not the last pass or the first pass,
// tmp picture 1 -> tmp picture 2
xcb_render_composite(c, XCB_RENDER_PICT_OP_SRC, src_pict, XCB_NONE,
dst_pict, 0, 0, 0, 0, 0, 0, width, height);
} else {
// This is the last pass, and this is also not the first
// This is the last pass, and we are doing more than 1 pass
xcb_render_composite(c, XCB_RENDER_PICT_OP_OVER, src_pict,
alpha_pict, xd->back[xd->curr_back], 0, 0, 0,
0, src_x, src_y, width, height);
0, to_i16_checked(extent->x1),
to_i16_checked(extent->y1), width, height);
}
// reset filter
@ -215,8 +221,6 @@ static bool blur(backend_t *backend_data, double opacity, void *ctx_,
src_pict = tmp_picture[current];
dst_pict = tmp_picture[!current];
src_x = 0;
src_y = 0;
current = !current;
}