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draw_bmp: refactor

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This commit is contained in:
wm4 2012-12-25 15:23:16 +01:00
parent c652e3f6b1
commit 5c049bf577
1 changed files with 31 additions and 17 deletions
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48
sub/draw_bmp.c
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@ -443,6 +443,35 @@ static bool get_sub_area(struct mp_rect bb, struct mp_image *temp,
return true;
}
// Convert the src image to imgfmt (which should be a 444 format)
static struct mp_image *chroma_up(struct mp_draw_sub_cache *cache, int imgfmt,
struct mp_image *src)
{
if (src->imgfmt == imgfmt)
return src;
struct mp_image *temp = mp_image_alloc(imgfmt, src->w, src->h);
// temp is always YUV, but src not necessarily
// reduce amount of conversions in YUV case (upsampling/shifting only)
if (src->flags & MP_IMGFLAG_YUV) {
temp->colorspace = src->colorspace;
temp->levels = src->levels;
}
mp_image_swscale(temp, src, SWS_POINT); // chroma up
return temp;
}
// Undo chroma_up()
static void chroma_down(struct mp_image *old_src, struct mp_image *temp)
{
assert(old_src->w == temp->w && old_src->h == temp->h);
if (temp != old_src) {
mp_image_swscale(old_src, temp, SWS_AREA); // chroma down
talloc_free(temp);
}
}
// cache: if not NULL, the function will set *cache to a talloc-allocated cache
// containing scaled versions of sbs contents - free the cache with
// talloc_free()
@ -467,21 +496,9 @@ void mp_draw_sub_bitmaps(struct mp_draw_sub_cache **cache, struct mp_image *dst,
if (!align_bbox_for_swscale(dst, &bb))
return;
struct mp_image *temp;
struct mp_image dst_region = *dst;
mp_image_crop_rc(&dst_region, bb);
if (dst->imgfmt == format) {
temp = &dst_region;
} else {
temp = mp_image_alloc(format, bb.x1 - bb.x0, bb.y1 - bb.y0);
// temp is always YUV, dst_region not
// reduce amount of conversions in YUV case (upsampling/shifting only)
if (dst_region.flags & MP_IMGFLAG_YUV) {
temp->colorspace = dst_region.colorspace;
temp->levels = dst_region.levels;
}
mp_image_swscale(temp, &dst_region, SWS_POINT); // chroma up
}
struct mp_image *temp = chroma_up(cache_, format, &dst_region);
if (sbs->format == SUBBITMAP_RGBA) {
draw_rgba(cache_, bb, temp, bits, sbs);
@ -489,10 +506,7 @@ void mp_draw_sub_bitmaps(struct mp_draw_sub_cache **cache, struct mp_image *dst,
draw_ass(cache_, bb, temp, bits, sbs);
}
if (temp != &dst_region) {
mp_image_swscale(&dst_region, temp, SWS_AREA); // chroma down
talloc_free(temp);
}
chroma_down(&dst_region, temp);
if (cache) {
*cache = cache_;