mirror of
https://gitlab.freedesktop.org/gstreamer/gstreamer.git
synced 2024-11-27 20:21:24 +00:00
8cacd54e8f
Use a more naive blend formulation that avoids off-by-one errors
at the 0x00 and 0xff alpha endpoints.
Fixes #810
Part-of: <https://gitlab.freedesktop.org/gstreamer/gst-plugins-base/-/merge_requests/796>
433 lines
8.6 KiB
Text
433 lines
8.6 KiB
Text
.function compositor_orc_splat_u32
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.dest 4 d1 guint32
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.param 4 p1 guint32
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copyl d1, p1
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.function compositor_orc_memcpy_u32
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.dest 4 d1 guint32
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.source 4 s1 guint32
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copyl d1, s1
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.function compositor_orc_blend_u8
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.flags 2d
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.dest 1 d1 guint8
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.source 1 s1 guint8
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.param 2 p1
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.temp 2 t1
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.temp 2 t2
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.const 1 c1 8
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convubw t1, d1
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convubw t2, s1
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subw t2, t2, t1
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mullw t2, t2, p1
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shlw t1, t1, c1
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addw t2, t1, t2
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shruw t2, t2, c1
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convsuswb d1, t2
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.function compositor_orc_blend_argb
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.flags 2d
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.dest 4 d guint8
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.source 4 s guint8
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.param 2 alpha
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.temp 4 t
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.temp 2 tw
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.temp 1 tb
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.temp 4 a
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.temp 8 d_wide
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.temp 8 s_wide
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.temp 8 a_wide
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.const 4 a_alpha 0x000000ff
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loadl t, s
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convlw tw, t
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convwb tb, tw
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splatbl a, tb
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x4 convubw a_wide, a
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x4 mullw a_wide, a_wide, alpha
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x4 div255w a_wide, a_wide
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x4 convubw s_wide, t
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x4 mullw s_wide, s_wide, a_wide
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# calc 255-alpha
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x4 subw a_wide, 0xff, a_wide
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loadl t, d
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x4 convubw d_wide, t
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x4 mullw d_wide, d_wide, a_wide
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x4 addw d_wide, d_wide, s_wide
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x4 div255w d_wide, d_wide
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x4 convwb t, d_wide
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orl t, t, a_alpha
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storel d, t
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.function compositor_orc_source_argb
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.flags 2d
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.dest 4 d guint8
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.source 4 s guint8
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.param 2 alpha
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.temp 4 t
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.temp 4 t2
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.temp 2 tw
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.temp 1 tb
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.temp 4 a
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.temp 8 a_wide
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.const 4 a_alpha 0x000000ff
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.const 4 a_not_alpha 0xffffff00
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loadl t, s
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convlw tw, t
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convwb tb, tw
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splatbl a, tb
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x4 convubw a_wide, a
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x4 mullw a_wide, a_wide, alpha
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x4 div255w a_wide, a_wide
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andl t, t, a_not_alpha
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x4 convwb t2, a_wide
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andl t2, t2, a_alpha
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orl t, t, t2
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storel d, t
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.function compositor_orc_blend_bgra
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.flags 2d
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.dest 4 d guint8
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.source 4 s guint8
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.param 2 alpha
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.temp 4 t
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.temp 4 t2
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.temp 2 tw
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.temp 1 tb
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.temp 4 a
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.temp 8 d_wide
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.temp 8 s_wide
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.temp 8 a_wide
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.const 4 a_alpha 0xff000000
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loadl t, s
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shrul t2, t, 24
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convlw tw, t2
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convwb tb, tw
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splatbl a, tb
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x4 convubw a_wide, a
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x4 mullw a_wide, a_wide, alpha
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x4 div255w a_wide, a_wide
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x4 convubw s_wide, t
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x4 mullw s_wide, s_wide, a_wide
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# calc 255-alpha
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x4 subw a_wide, 0xff, a_wide
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loadl t, d
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x4 convubw d_wide, t
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x4 mullw d_wide, d_wide, a_wide
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x4 addw d_wide, d_wide, s_wide
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x4 div255w d_wide, d_wide
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x4 convwb t, d_wide
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orl t, t, a_alpha
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storel d, t
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.function compositor_orc_source_bgra
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.flags 2d
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.dest 4 d guint8
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.source 4 s guint8
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.param 2 alpha
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.temp 4 t
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.temp 4 t2
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.temp 2 tw
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.temp 1 tb
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.temp 4 a
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.temp 8 a_wide
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.const 4 a_alpha 0xff000000
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.const 4 a_not_alpha 0x00ffffff
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loadl t, s
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convhlw tw, t
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convhwb tb, tw
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splatbl a, tb
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x4 convubw a_wide, a
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x4 mullw a_wide, a_wide, alpha
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x4 div255w a_wide, a_wide
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andl t, t, a_not_alpha
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x4 convwb t2, a_wide
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andl t2, t2, a_alpha
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orl t, t, t2
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storel d, t
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.function compositor_orc_overlay_argb
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.flags 2d
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.dest 4 d guint8
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.source 4 s guint8
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.param 2 alpha
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.temp 4 t
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.temp 2 tw
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.temp 1 tb
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.temp 8 alpha_s
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.temp 8 alpha_s_inv
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.temp 8 alpha_d
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.temp 4 a
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.temp 8 d_wide
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.temp 8 s_wide
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.const 4 xfs 0xffffffff
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.const 4 a_alpha 0x000000ff
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.const 4 a_alpha_inv 0xffffff00
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# calc source alpha as alpha_s = alpha_s * alpha / 255
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loadl t, s
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convlw tw, t
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convwb tb, tw
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splatbl a, tb
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x4 convubw alpha_s, a
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x4 mullw alpha_s, alpha_s, alpha
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x4 div255w alpha_s, alpha_s
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x4 convubw s_wide, t
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x4 mullw s_wide, s_wide, alpha_s
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# calc destination alpha as alpha_d = (255-alpha_s) * alpha_d / 255
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loadpl a, xfs
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x4 convubw alpha_s_inv, a
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x4 subw alpha_s_inv, alpha_s_inv, alpha_s
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loadl t, d
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convlw tw, t
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convwb tb, tw
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splatbl a, tb
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x4 convubw alpha_d, a
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x4 mullw alpha_d, alpha_d, alpha_s_inv
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x4 div255w alpha_d, alpha_d
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x4 convubw d_wide, t
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x4 mullw d_wide, d_wide, alpha_d
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# calc final pixel as pix_d = pix_s*alpha_s + pix_d*alpha_d*(255-alpha_s)/255
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x4 addw d_wide, d_wide, s_wide
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# calc the final destination alpha_d = alpha_s + alpha_d * (255-alpha_s)/255
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x4 addw alpha_d, alpha_d, alpha_s
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# now normalize the pix_d by the final alpha to make it associative
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x4 divluw, d_wide, d_wide, alpha_d
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# pack the new alpha into the correct spot
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x4 convwb t, d_wide
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andl t, t, a_alpha_inv
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x4 convwb a, alpha_d
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andl a, a, a_alpha
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orl t, t, a
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storel d, t
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.function compositor_orc_overlay_argb_addition
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.flags 2d
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.dest 4 d guint8
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.source 4 s guint8
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.param 2 alpha
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.temp 4 t
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.temp 2 tw
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.temp 1 tb
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.temp 8 alpha_s
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.temp 8 alpha_s_inv
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.temp 8 alpha_factor
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.temp 8 alpha_d
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.temp 4 a
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.temp 8 d_wide
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.temp 8 s_wide
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.const 4 xfs 0xffffffff
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.const 4 a_alpha 0x000000ff
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.const 4 a_alpha_inv 0xffffff00
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# calc source alpha as alpha_s = alpha_s * alpha / 255
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loadl t, s
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convlw tw, t
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convwb tb, tw
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splatbl a, tb
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x4 convubw alpha_s, a
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x4 mullw alpha_s, alpha_s, alpha
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x4 div255w alpha_s, alpha_s
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x4 convubw s_wide, t
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x4 mullw s_wide, s_wide, alpha_s
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# calc destination alpha as alpha_factor = (255-alpha_s) * alpha_factor / factor
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loadpl a, xfs
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x4 convubw alpha_s_inv, a
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x4 subw alpha_s_inv, alpha_s_inv, alpha_s
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loadl t, d
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convlw tw, t
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convwb tb, tw
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splatbl a, tb
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x4 convubw alpha_factor, a
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x4 mullw alpha_factor, alpha_factor, alpha_s_inv
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x4 div255w alpha_factor, alpha_factor
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x4 convubw d_wide, t
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x4 mullw d_wide, d_wide, alpha_factor
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# calc final pixel as pix_d = pix_s*alpha_s + pix_d*alpha_factor*(255-alpha_s)/255
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x4 addw d_wide, d_wide, s_wide
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# calc the alpha factor alpha_factor = alpha_s + alpha_factor * (255-alpha_s)/255
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x4 addw alpha_factor, alpha_factor, alpha_s
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# now normalize the pix_d by the final alpha to make it associative
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x4 divluw, d_wide, d_wide, alpha_factor
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# calc the final global alpha_d = alpha_d + (alpha_s * (alpha / 255))
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loadl t, d
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convlw tw, t
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convwb tb, tw
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splatbl a, tb
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x4 convubw alpha_d, a
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x4 addw alpha_d, alpha_d, alpha_s
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# pack the new alpha into the correct spot
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x4 convwb t, d_wide
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andl t, t, a_alpha_inv
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x4 convwb a, alpha_d
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andl a, a, a_alpha
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orl t, t, a
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storel d, t
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.function compositor_orc_overlay_bgra
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.flags 2d
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.dest 4 d guint8
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.source 4 s guint8
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.param 2 alpha
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.temp 4 t
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.temp 4 t2
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.temp 2 tw
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.temp 1 tb
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.temp 8 alpha_s
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.temp 8 alpha_s_inv
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.temp 8 alpha_d
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.temp 4 a
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.temp 8 d_wide
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.temp 8 s_wide
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.const 4 xfs 0xffffffff
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.const 4 a_alpha 0xff000000
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.const 4 a_alpha_inv 0x00ffffff
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# calc source alpha as alpha_s = alpha_s * alpha / 255
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loadl t, s
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shrul t2, t, 24
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convlw tw, t2
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convwb tb, tw
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splatbl a, tb
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x4 convubw alpha_s, a
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x4 mullw alpha_s, alpha_s, alpha
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x4 div255w alpha_s, alpha_s
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x4 convubw s_wide, t
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x4 mullw s_wide, s_wide, alpha_s
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# calc destination alpha as alpha_d = (255-alpha_s) * alpha_d / 255
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loadpl a, xfs
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x4 convubw alpha_s_inv, a
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x4 subw alpha_s_inv, alpha_s_inv, alpha_s
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loadl t, d
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shrul t2, t, 24
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convlw tw, t2
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convwb tb, tw
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splatbl a, tb
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x4 convubw alpha_d, a
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x4 mullw alpha_d, alpha_d, alpha_s_inv
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x4 div255w alpha_d, alpha_d
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x4 convubw d_wide, t
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x4 mullw d_wide, d_wide, alpha_d
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# calc final pixel as pix_d = pix_s*alpha_s + pix_d*alpha_d*(255-alpha_s)/255
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x4 addw d_wide, d_wide, s_wide
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# calc the final destination alpha_d = alpha_s + alpha_d * (255-alpha_s)/255
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x4 addw alpha_d, alpha_d, alpha_s
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# now normalize the pix_d by the final alpha to make it associative
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x4 divluw, d_wide, d_wide, alpha_d
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# pack the new alpha into the correct spot
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x4 convwb t, d_wide
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andl t, t, a_alpha_inv
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x4 convwb a, alpha_d
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andl a, a, a_alpha
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orl t, t, a
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storel d, t
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.function compositor_orc_overlay_bgra_addition
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.flags 2d
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.dest 4 d guint8
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.source 4 s guint8
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.param 2 alpha
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.temp 4 t
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.temp 4 t2
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.temp 2 tw
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.temp 1 tb
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.temp 8 alpha_s
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.temp 8 alpha_s_inv
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.temp 8 alpha_factor
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.temp 8 alpha_d
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.temp 4 a
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.temp 8 d_wide
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.temp 8 s_wide
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.const 4 xfs 0xffffffff
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.const 4 a_alpha 0xff000000
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.const 4 a_alpha_inv 0x00ffffff
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# calc source alpha as alpha_s = alpha_s * alpha / 255
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loadl t, s
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shrul t2, t, 24
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convlw tw, t2
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convwb tb, tw
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splatbl a, tb
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x4 convubw alpha_s, a
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x4 mullw alpha_s, alpha_s, alpha
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x4 div255w alpha_s, alpha_s
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x4 convubw s_wide, t
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x4 mullw s_wide, s_wide, alpha_s
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# calc destination alpha as alpha_factor = (255-alpha_s) * alpha_factor / 255
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loadpl a, xfs
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x4 convubw alpha_s_inv, a
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x4 subw alpha_s_inv, alpha_s_inv, alpha_s
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loadl t, d
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shrul t2, t, 24
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convlw tw, t2
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convwb tb, tw
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splatbl a, tb
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x4 convubw alpha_factor, a
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x4 mullw alpha_factor, alpha_factor, alpha_s_inv
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x4 div255w alpha_factor, alpha_factor
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x4 convubw d_wide, t
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x4 mullw d_wide, d_wide, alpha_factor
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# calc final pixel as pix_d = pix_s*alpha_s + pix_d*alpha_factor*(255-alpha_s)/255
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x4 addw d_wide, d_wide, s_wide
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# calc the final destination alpha_factor = alpha_s + alpha_factor * (255-alpha_s)/255
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x4 addw alpha_factor, alpha_factor, alpha_s
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# now normalize the pix_d by the final alpha to make it associative
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x4 divluw, d_wide, d_wide, alpha_factor
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# calc the final global alpha_d = alpha_d + (alpha_s * (alpha / 255))
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loadl t, d
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shrul t2, t, 24
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convlw tw, t2
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convwb tb, tw
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splatbl a, tb
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x4 convubw alpha_d, a
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x4 addw alpha_d, alpha_d, alpha_s
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# pack the new alpha into the correct spot
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x4 convwb t, d_wide
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andl t, t, a_alpha_inv
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x4 convwb a, alpha_d
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andl a, a, a_alpha
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orl t, t, a
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storel d, t
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