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FS-7500: allow patch to negative x,y

This commit is contained in:
Seven Du 2015-04-19 08:34:21 +08:00 committed by Michael Jerris
parent d697acb281
commit 6afe079946
1 changed files with 17 additions and 5 deletions
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22
src/switch_core_video.c
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@ -125,6 +125,7 @@ SWITCH_DECLARE(void) switch_img_free(switch_image_t **img)
SWITCH_DECLARE(void) switch_img_patch(switch_image_t *IMG, switch_image_t *img, int x, int y)
{
int i, len, max_h;
int xoff = 0, yoff = 0;
switch_assert(IMG->fmt == SWITCH_IMG_FMT_I420);
@ -152,15 +153,26 @@ SWITCH_DECLARE(void) switch_img_patch(switch_image_t *IMG, switch_image_t *img,
return;
}
max_h = MIN(y + img->d_h, IMG->d_h);
len = MIN(img->d_w, IMG->d_w - x);
if (x < 0) {
xoff = -x;
x = 0;
}
if (y < 0) {
yoff = -y;
y = 0;
}
max_h = MIN(y + img->d_h - yoff, IMG->d_h);
len = MIN(img->d_w - xoff, IMG->d_w - x);
if (x & 0x1) { x++; len--; }
if (y & 0x1) y++;
if (len <= 0) return;
for (i = y; i < max_h; i++) {
memcpy(IMG->planes[SWITCH_PLANE_Y] + IMG->stride[SWITCH_PLANE_Y] * i + x, img->planes[SWITCH_PLANE_Y] + img->stride[SWITCH_PLANE_Y] * (i - y), len);
memcpy(IMG->planes[SWITCH_PLANE_Y] + IMG->stride[SWITCH_PLANE_Y] * i + x, img->planes[SWITCH_PLANE_Y] + img->stride[SWITCH_PLANE_Y] * (i - y + yoff) + xoff, len);
}
if ((len & 1) && (x + len) < img->d_w - 1) len++;
@ -168,8 +180,8 @@ SWITCH_DECLARE(void) switch_img_patch(switch_image_t *IMG, switch_image_t *img,
len /= 2;
for (i = y; i < max_h; i += 2) {
memcpy(IMG->planes[SWITCH_PLANE_U] + IMG->stride[SWITCH_PLANE_U] * i / 2 + x / 2, img->planes[SWITCH_PLANE_U] + img->stride[SWITCH_PLANE_U] * (i - y) / 2, len);
memcpy(IMG->planes[SWITCH_PLANE_V] + IMG->stride[SWITCH_PLANE_V] * i / 2 + x / 2, img->planes[SWITCH_PLANE_V] + img->stride[SWITCH_PLANE_V] * (i - y) / 2, len);
memcpy(IMG->planes[SWITCH_PLANE_U] + IMG->stride[SWITCH_PLANE_U] * i / 2 + x / 2, img->planes[SWITCH_PLANE_U] + img->stride[SWITCH_PLANE_U] * (i - y + yoff) / 2 + xoff / 2, len);
memcpy(IMG->planes[SWITCH_PLANE_V] + IMG->stride[SWITCH_PLANE_V] * i / 2 + x / 2, img->planes[SWITCH_PLANE_V] + img->stride[SWITCH_PLANE_V] * (i - y + yoff) / 2 + xoff / 2, len);
}
}