bfa59b4a5f
- Made source buffers pointers to const. - Renamed vpx_blend_mask6b to vpx_blend_a64_mask. This is more indicative that the function does alpha blending. The 6, or 6b suffix was misleading, as the max mask value (64) does not fit into 6 bits. - Added VPX_BLEND_* macros to use when needing to blend scalars. - Use VPX_BLEND_A256 in combine_interintra to be more explicit about the operation being done. - Added versions of vpx_blend_a64_* which take 1D horizontal/vertical masks directly and apply them to all rows/columns (vpx_blend_a64_hmask and vpx_blend_a64_vmask). The SSE4.1 optimzied horizontal version now falls back on the 2D version. This can be improved upon if it show up high enough in a profile. - All vpx_blend_a64_* functions now support block sizes down to 1x1 (ie: a single pixel). This is for usage convenience. The SSE4.1 optimized versions fall back on the C implementation if w <= 2 or h <= 2. This can again be improved if it becomes hot code. Change-Id: I13ab3835146ffafe3e1d74d8e9cf64a5abe4144d
41 lines
1.6 KiB
C
41 lines
1.6 KiB
C
/*
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* Copyright (c) 2016 The WebM project authors. All Rights Reserved.
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*
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* Use of this source code is governed by a BSD-style license
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* that can be found in the LICENSE file in the root of the source
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* tree. An additional intellectual property rights grant can be found
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* in the file PATENTS. All contributing project authors may
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* be found in the AUTHORS file in the root of the source tree.
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*/
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#ifndef VPX_DSP_BLEND_H_
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#define VPX_DSP_BLEND_H_
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#include "vpx_ports/mem.h"
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// Various blending functions and macros.
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// See also the vpx_blend_* functions in vpx_dsp_rtcd.h
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// Alpha blending with alpha values from the range [0, 64], where 64
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// means use the first input and 0 means use the second input.
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#define VPX_BLEND_A64_ROUND_BITS 6
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#define VPX_BLEND_A64_MAX_ALPHA (1 << VPX_BLEND_A64_ROUND_BITS) // 64
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#define VPX_BLEND_A64(a, v0, v1) \
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ROUND_POWER_OF_TWO((a) * (v0) + (VPX_BLEND_A64_MAX_ALPHA - (a)) * (v1), \
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VPX_BLEND_A64_ROUND_BITS)
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// Alpha blending with alpha values from the range [0, 256], where 256
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// means use the first input and 0 means use the second input.
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#define VPX_BLEND_A256_ROUND_BITS 8
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#define VPX_BLEND_A256_MAX_ALPHA (1 << VPX_BLEND_A256_ROUND_BITS) // 256
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#define VPX_BLEND_A256(a, v0, v1) \
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ROUND_POWER_OF_TWO((a) * (v0) + (VPX_BLEND_A256_MAX_ALPHA - (a)) * (v1), \
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VPX_BLEND_A256_ROUND_BITS)
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// Blending by averaging.
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#define VPX_BLEND_AVG(v0, v1) ROUND_POWER_OF_TWO((v0) + (v1), 1)
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#endif // VPX_DSP_BLEND_H_
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