371 lines
13 KiB
C
371 lines
13 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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#include "vp9/common/vp9_convolve.h"
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#include <assert.h>
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#include "./vpx_config.h"
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#include "./vp9_rtcd.h"
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#include "vp9/common/vp9_common.h"
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#include "vpx/vpx_integer.h"
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#include "vpx_ports/mem.h"
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#define VP9_FILTER_WEIGHT 128
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#define VP9_FILTER_SHIFT 7
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/* Assume a bank of 16 filters to choose from. There are two implementations
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* for filter wrapping behavior, since we want to be able to pick which filter
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* to start with. We could either:
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*
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* 1) make filter_ a pointer to the base of the filter array, and then add an
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* additional offset parameter, to choose the starting filter.
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* 2) use a pointer to 2 periods worth of filters, so that even if the original
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* phase offset is at 15/16, we'll have valid data to read. The filter
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* tables become [32][8], and the second half is duplicated.
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* 3) fix the alignment of the filter tables, so that we know the 0/16 is
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* always 256 byte aligned.
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*
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* Implementations 2 and 3 are likely preferable, as they avoid an extra 2
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* parameters, and switching between them is trivial, with the
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* ALIGN_FILTERS_256 macro, below.
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*/
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#define ALIGN_FILTERS_256 1
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static void convolve_horiz_c(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_x0, 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 taps) {
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int x, y, k, sum;
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const int16_t *filter_x_base = filter_x0;
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#if ALIGN_FILTERS_256
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filter_x_base = (const int16_t *)(((intptr_t)filter_x0) & ~(intptr_t)0xff);
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#endif
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/* Adjust base pointer address for this source line */
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src -= taps / 2 - 1;
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for (y = 0; y < h; ++y) {
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/* Pointer to filter to use */
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const int16_t *filter_x = filter_x0;
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/* Initial phase offset */
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int x0_q4 = (filter_x - filter_x_base) / taps;
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int x_q4 = x0_q4;
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for (x = 0; x < w; ++x) {
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/* Per-pixel src offset */
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int src_x = (x_q4 - x0_q4) >> 4;
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for (sum = 0, k = 0; k < taps; ++k) {
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sum += src[src_x + k] * filter_x[k];
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}
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sum += (VP9_FILTER_WEIGHT >> 1);
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dst[x] = clip_pixel(sum >> VP9_FILTER_SHIFT);
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/* Adjust source and filter to use for the next pixel */
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x_q4 += x_step_q4;
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filter_x = filter_x_base + (x_q4 & 0xf) * taps;
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}
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src += src_stride;
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dst += dst_stride;
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}
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}
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static void convolve_avg_horiz_c(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_x0, 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 taps) {
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int x, y, k, sum;
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const int16_t *filter_x_base = filter_x0;
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#if ALIGN_FILTERS_256
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filter_x_base = (const int16_t *)(((intptr_t)filter_x0) & ~(intptr_t)0xff);
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#endif
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/* Adjust base pointer address for this source line */
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src -= taps / 2 - 1;
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for (y = 0; y < h; ++y) {
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/* Pointer to filter to use */
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const int16_t *filter_x = filter_x0;
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/* Initial phase offset */
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int x0_q4 = (filter_x - filter_x_base) / taps;
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int x_q4 = x0_q4;
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for (x = 0; x < w; ++x) {
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/* Per-pixel src offset */
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int src_x = (x_q4 - x0_q4) >> 4;
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for (sum = 0, k = 0; k < taps; ++k) {
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sum += src[src_x + k] * filter_x[k];
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}
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sum += (VP9_FILTER_WEIGHT >> 1);
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dst[x] = (dst[x] + clip_pixel(sum >> VP9_FILTER_SHIFT) + 1) >> 1;
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/* Adjust source and filter to use for the next pixel */
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x_q4 += x_step_q4;
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filter_x = filter_x_base + (x_q4 & 0xf) * taps;
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}
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src += src_stride;
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dst += dst_stride;
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}
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}
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static void convolve_vert_c(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_y0, int y_step_q4,
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int w, int h, int taps) {
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int x, y, k, sum;
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const int16_t *filter_y_base = filter_y0;
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#if ALIGN_FILTERS_256
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filter_y_base = (const int16_t *)(((intptr_t)filter_y0) & ~(intptr_t)0xff);
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#endif
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/* Adjust base pointer address for this source column */
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src -= src_stride * (taps / 2 - 1);
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for (x = 0; x < w; ++x) {
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/* Pointer to filter to use */
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const int16_t *filter_y = filter_y0;
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/* Initial phase offset */
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int y0_q4 = (filter_y - filter_y_base) / taps;
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int y_q4 = y0_q4;
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for (y = 0; y < h; ++y) {
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/* Per-pixel src offset */
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int src_y = (y_q4 - y0_q4) >> 4;
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for (sum = 0, k = 0; k < taps; ++k) {
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sum += src[(src_y + k) * src_stride] * filter_y[k];
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}
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sum += (VP9_FILTER_WEIGHT >> 1);
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dst[y * dst_stride] = clip_pixel(sum >> VP9_FILTER_SHIFT);
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/* Adjust source and filter to use for the next pixel */
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y_q4 += y_step_q4;
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filter_y = filter_y_base + (y_q4 & 0xf) * taps;
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}
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++src;
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++dst;
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}
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}
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static void convolve_avg_vert_c(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_y0, int y_step_q4,
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int w, int h, int taps) {
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int x, y, k, sum;
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const int16_t *filter_y_base = filter_y0;
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#if ALIGN_FILTERS_256
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filter_y_base = (const int16_t *)(((intptr_t)filter_y0) & ~(intptr_t)0xff);
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#endif
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/* Adjust base pointer address for this source column */
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src -= src_stride * (taps / 2 - 1);
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for (x = 0; x < w; ++x) {
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/* Pointer to filter to use */
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const int16_t *filter_y = filter_y0;
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/* Initial phase offset */
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int y0_q4 = (filter_y - filter_y_base) / taps;
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int y_q4 = y0_q4;
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for (y = 0; y < h; ++y) {
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/* Per-pixel src offset */
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int src_y = (y_q4 - y0_q4) >> 4;
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for (sum = 0, k = 0; k < taps; ++k) {
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sum += src[(src_y + k) * src_stride] * filter_y[k];
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}
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sum += (VP9_FILTER_WEIGHT >> 1);
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dst[y * dst_stride] =
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(dst[y * dst_stride] + clip_pixel(sum >> VP9_FILTER_SHIFT) + 1) >> 1;
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/* Adjust source and filter to use for the next pixel */
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y_q4 += y_step_q4;
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filter_y = filter_y_base + (y_q4 & 0xf) * taps;
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}
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++src;
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++dst;
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}
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}
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static void convolve_c(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 taps) {
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/* Fixed size intermediate buffer places limits on parameters.
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* Maximum intermediate_height is 135, for y_step_q4 == 32,
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* h == 64, taps == 8.
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*/
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uint8_t temp[64 * 135];
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int intermediate_height = MAX(((h * y_step_q4) >> 4), 1) + taps - 1;
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assert(w <= 64);
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assert(h <= 64);
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assert(taps <= 8);
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assert(y_step_q4 <= 32);
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assert(x_step_q4 <= 32);
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if (intermediate_height < h)
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intermediate_height = h;
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convolve_horiz_c(src - src_stride * (taps / 2 - 1), src_stride,
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temp, 64,
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filter_x, x_step_q4, filter_y, y_step_q4,
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w, intermediate_height, taps);
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convolve_vert_c(temp + 64 * (taps / 2 - 1), 64, dst, dst_stride,
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filter_x, x_step_q4, filter_y, y_step_q4,
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w, h, taps);
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}
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static void convolve_avg_c(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 taps) {
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/* Fixed size intermediate buffer places limits on parameters.
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* Maximum intermediate_height is 135, for y_step_q4 == 32,
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* h == 64, taps == 8.
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*/
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uint8_t temp[64 * 135];
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int intermediate_height = MAX(((h * y_step_q4) >> 4), 1) + taps - 1;
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assert(w <= 64);
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assert(h <= 64);
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assert(taps <= 8);
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assert(y_step_q4 <= 32);
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assert(x_step_q4 <= 32);
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if (intermediate_height < h)
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intermediate_height = h;
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convolve_horiz_c(src - src_stride * (taps / 2 - 1), src_stride,
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temp, 64,
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filter_x, x_step_q4, filter_y, y_step_q4,
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w, intermediate_height, taps);
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convolve_avg_vert_c(temp + 64 * (taps / 2 - 1), 64, dst, dst_stride,
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filter_x, x_step_q4, filter_y, y_step_q4,
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w, h, taps);
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}
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void vp9_convolve8_horiz_c(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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convolve_horiz_c(src, src_stride, dst, dst_stride,
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filter_x, x_step_q4, filter_y, y_step_q4,
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w, h, 8);
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}
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void vp9_convolve8_avg_horiz_c(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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convolve_avg_horiz_c(src, src_stride, dst, dst_stride,
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filter_x, x_step_q4, filter_y, y_step_q4,
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w, h, 8);
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}
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void vp9_convolve8_vert_c(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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convolve_vert_c(src, src_stride, dst, dst_stride,
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filter_x, x_step_q4, filter_y, y_step_q4,
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w, h, 8);
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}
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void vp9_convolve8_avg_vert_c(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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convolve_avg_vert_c(src, src_stride, dst, dst_stride,
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filter_x, x_step_q4, filter_y, y_step_q4,
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w, h, 8);
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}
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void vp9_convolve8_c(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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convolve_c(src, src_stride, dst, dst_stride,
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filter_x, x_step_q4, filter_y, y_step_q4,
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w, h, 8);
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}
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void vp9_convolve8_avg_c(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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/* Fixed size intermediate buffer places limits on parameters. */
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DECLARE_ALIGNED_ARRAY(16, uint8_t, temp, 64 * 64);
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assert(w <= 64);
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assert(h <= 64);
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vp9_convolve8(src, src_stride,
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temp, 64,
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filter_x, x_step_q4,
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filter_y, y_step_q4,
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w, h);
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vp9_convolve_avg(temp, 64,
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dst, dst_stride,
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NULL, 0, /* These unused parameter should be removed! */
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NULL, 0, /* These unused parameter should be removed! */
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w, h);
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}
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void vp9_convolve_copy_c(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 filter_x_stride,
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const int16_t *filter_y, int filter_y_stride,
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int w, int h) {
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int r;
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for (r = h; r > 0; --r) {
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memcpy(dst, src, w);
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src += src_stride;
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dst += dst_stride;
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}
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}
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void vp9_convolve_avg_c(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 filter_x_stride,
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const int16_t *filter_y, int filter_y_stride,
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int w, int h) {
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int x, y;
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for (y = 0; y < h; ++y) {
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for (x = 0; x < w; ++x) {
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dst[x] = (dst[x] + src[x] + 1) >> 1;
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}
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src += src_stride;
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dst += dst_stride;
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}
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}
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