57 lines
2.2 KiB
C
57 lines
2.2 KiB
C
/*
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* Copyright (c) 2013 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_VPX_CONVOLVE_H_
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#define VPX_DSP_VPX_CONVOLVE_H_
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#include "./vpx_config.h"
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#include "vpx/vpx_integer.h"
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#ifdef __cplusplus
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extern "C" {
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#endif
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// Note: Fixed size intermediate buffers, place limits on parameters
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// of some functions. 2d filtering proceeds in 2 steps:
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// (1) Interpolate horizontally into an intermediate buffer, temp.
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// (2) Interpolate temp vertically to derive the sub-pixel result.
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// Deriving the maximum number of rows in the temp buffer (135):
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// --Smallest scaling factor is x1/2 ==> y_step_q4 = 32 (Normative).
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// --Largest block size is 64x64 pixels.
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// --64 rows in the downscaled frame span a distance of (64 - 1) * 32 in the
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// original frame (in 1/16th pixel units).
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// --Must round-up because block may be located at sub-pixel position.
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// --Require an additional SUBPEL_TAPS rows for the 8-tap filter tails.
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// --((64 - 1) * 32 + 15) >> 4 + 8 = 135.
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#if CONFIG_VP10 && CONFIG_EXT_PARTITION
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# define MAX_EXT_SIZE 263
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#else
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# define MAX_EXT_SIZE 135
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#endif // CONFIG_VP10 && CONFIG_EXT_PARTITION
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typedef void (*convolve_fn_t)(const uint8_t *src, ptrdiff_t src_stride,
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uint8_t *dst, ptrdiff_t dst_stride,
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const int16_t *filter_x, int x_step_q4,
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const int16_t *filter_y, int y_step_q4,
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int w, int h);
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#if CONFIG_VP9_HIGHBITDEPTH
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typedef void (*highbd_convolve_fn_t)(const uint8_t *src, ptrdiff_t src_stride,
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uint8_t *dst, ptrdiff_t dst_stride,
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const int16_t *filter_x, int x_step_q4,
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const int16_t *filter_y, int y_step_q4,
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int w, int h, int bd);
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#endif
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#ifdef __cplusplus
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} // extern "C"
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#endif
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#endif // VPX_DSP_VPX_CONVOLVE_H_
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