558 строки
22 KiB
C
558 строки
22 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 <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 "vp9/common/vp9_convolve.h"
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#include "vp9/common/vp9_filter.h"
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#include "vpx/vpx_integer.h"
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#include "vpx_ports/mem.h"
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static void convolve_horiz(const uint8_t *src, ptrdiff_t src_stride,
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uint8_t *dst, ptrdiff_t dst_stride,
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const InterpKernel *x_filters,
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int x0_q4, int x_step_q4, int w, int h) {
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int x, y;
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src -= SUBPEL_TAPS / 2 - 1;
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for (y = 0; y < h; ++y) {
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int x_q4 = x0_q4;
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for (x = 0; x < w; ++x) {
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const uint8_t *const src_x = &src[x_q4 >> SUBPEL_BITS];
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const int16_t *const x_filter = x_filters[x_q4 & SUBPEL_MASK];
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int k, sum = 0;
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for (k = 0; k < SUBPEL_TAPS; ++k)
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sum += src_x[k] * x_filter[k];
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dst[x] = clip_pixel(ROUND_POWER_OF_TWO(sum, FILTER_BITS));
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x_q4 += x_step_q4;
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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(const uint8_t *src, ptrdiff_t src_stride,
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uint8_t *dst, ptrdiff_t dst_stride,
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const InterpKernel *x_filters,
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int x0_q4, int x_step_q4, int w, int h) {
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int x, y;
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src -= SUBPEL_TAPS / 2 - 1;
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for (y = 0; y < h; ++y) {
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int x_q4 = x0_q4;
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for (x = 0; x < w; ++x) {
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const uint8_t *const src_x = &src[x_q4 >> SUBPEL_BITS];
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const int16_t *const x_filter = x_filters[x_q4 & SUBPEL_MASK];
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int k, sum = 0;
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for (k = 0; k < SUBPEL_TAPS; ++k)
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sum += src_x[k] * x_filter[k];
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dst[x] = ROUND_POWER_OF_TWO(dst[x] +
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clip_pixel(ROUND_POWER_OF_TWO(sum, FILTER_BITS)), 1);
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x_q4 += x_step_q4;
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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(const uint8_t *src, ptrdiff_t src_stride,
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uint8_t *dst, ptrdiff_t dst_stride,
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const InterpKernel *y_filters,
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int y0_q4, int y_step_q4, int w, int h) {
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int x, y;
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src -= src_stride * (SUBPEL_TAPS / 2 - 1);
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for (x = 0; x < w; ++x) {
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int y_q4 = y0_q4;
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for (y = 0; y < h; ++y) {
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const unsigned char *src_y = &src[(y_q4 >> SUBPEL_BITS) * src_stride];
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const int16_t *const y_filter = y_filters[y_q4 & SUBPEL_MASK];
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int k, sum = 0;
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for (k = 0; k < SUBPEL_TAPS; ++k)
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sum += src_y[k * src_stride] * y_filter[k];
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dst[y * dst_stride] = clip_pixel(ROUND_POWER_OF_TWO(sum, FILTER_BITS));
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y_q4 += y_step_q4;
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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(const uint8_t *src, ptrdiff_t src_stride,
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uint8_t *dst, ptrdiff_t dst_stride,
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const InterpKernel *y_filters,
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int y0_q4, int y_step_q4, int w, int h) {
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int x, y;
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src -= src_stride * (SUBPEL_TAPS / 2 - 1);
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for (x = 0; x < w; ++x) {
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int y_q4 = y0_q4;
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for (y = 0; y < h; ++y) {
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const unsigned char *src_y = &src[(y_q4 >> SUBPEL_BITS) * src_stride];
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const int16_t *const y_filter = y_filters[y_q4 & SUBPEL_MASK];
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int k, sum = 0;
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for (k = 0; k < SUBPEL_TAPS; ++k)
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sum += src_y[k * src_stride] * y_filter[k];
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dst[y * dst_stride] = ROUND_POWER_OF_TWO(dst[y * dst_stride] +
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clip_pixel(ROUND_POWER_OF_TWO(sum, FILTER_BITS)), 1);
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y_q4 += y_step_q4;
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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(const uint8_t *src, ptrdiff_t src_stride,
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uint8_t *dst, ptrdiff_t dst_stride,
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const InterpKernel *const x_filters,
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int x0_q4, int x_step_q4,
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const InterpKernel *const y_filters,
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int y0_q4, int y_step_q4,
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int w, int h) {
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// Note: Fixed size intermediate buffer, temp, places limits on parameters.
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// 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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uint8_t temp[135 * 64];
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int intermediate_height =
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(((h - 1) * y_step_q4 + y0_q4) >> SUBPEL_BITS) + SUBPEL_TAPS;
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assert(w <= 64);
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assert(h <= 64);
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assert(y_step_q4 <= 32);
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assert(x_step_q4 <= 32);
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convolve_horiz(src - src_stride * (SUBPEL_TAPS / 2 - 1), src_stride, temp, 64,
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x_filters, x0_q4, x_step_q4, w, intermediate_height);
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convolve_vert(temp + 64 * (SUBPEL_TAPS / 2 - 1), 64, dst, dst_stride,
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y_filters, y0_q4, y_step_q4, w, h);
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}
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static const InterpKernel *get_filter_base(const int16_t *filter) {
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// NOTE: This assumes that the filter table is 256-byte aligned.
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// TODO(agrange) Modify to make independent of table alignment.
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return (const InterpKernel *)(((intptr_t)filter) & ~((intptr_t)0xFF));
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}
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static int get_filter_offset(const int16_t *f, const InterpKernel *base) {
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return (int)((const InterpKernel *)(intptr_t)f - base);
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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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const InterpKernel *const filters_x = get_filter_base(filter_x);
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const int x0_q4 = get_filter_offset(filter_x, filters_x);
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(void)filter_y;
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(void)y_step_q4;
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convolve_horiz(src, src_stride, dst, dst_stride, filters_x,
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x0_q4, x_step_q4, w, h);
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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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const InterpKernel *const filters_x = get_filter_base(filter_x);
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const int x0_q4 = get_filter_offset(filter_x, filters_x);
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(void)filter_y;
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(void)y_step_q4;
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convolve_avg_horiz(src, src_stride, dst, dst_stride, filters_x,
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x0_q4, x_step_q4, w, h);
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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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const InterpKernel *const filters_y = get_filter_base(filter_y);
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const int y0_q4 = get_filter_offset(filter_y, filters_y);
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(void)filter_x;
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(void)x_step_q4;
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convolve_vert(src, src_stride, dst, dst_stride, filters_y,
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y0_q4, y_step_q4, w, h);
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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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const InterpKernel *const filters_y = get_filter_base(filter_y);
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const int y0_q4 = get_filter_offset(filter_y, filters_y);
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(void)filter_x;
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(void)x_step_q4;
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convolve_avg_vert(src, src_stride, dst, dst_stride, filters_y,
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y0_q4, y_step_q4, w, h);
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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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const InterpKernel *const filters_x = get_filter_base(filter_x);
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const int x0_q4 = get_filter_offset(filter_x, filters_x);
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const InterpKernel *const filters_y = get_filter_base(filter_y);
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const int y0_q4 = get_filter_offset(filter_y, filters_y);
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convolve(src, src_stride, dst, dst_stride,
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filters_x, x0_q4, x_step_q4,
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filters_y, y0_q4, y_step_q4, w, h);
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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_c(src, src_stride, temp, 64,
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filter_x, x_step_q4, filter_y, y_step_q4, w, h);
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vp9_convolve_avg_c(temp, 64, dst, dst_stride, NULL, 0, NULL, 0, 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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(void)filter_x; (void)filter_x_stride;
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(void)filter_y; (void)filter_y_stride;
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for (r = h; r > 0; --r) {
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vpx_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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(void)filter_x; (void)filter_x_stride;
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(void)filter_y; (void)filter_y_stride;
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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] = ROUND_POWER_OF_TWO(dst[x] + src[x], 1);
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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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#if CONFIG_VP9_HIGHBITDEPTH
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static void highbd_convolve_horiz(const uint8_t *src8, ptrdiff_t src_stride,
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uint8_t *dst8, ptrdiff_t dst_stride,
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const InterpKernel *x_filters,
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int x0_q4, int x_step_q4,
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int w, int h, int bd) {
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int x, y;
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uint16_t *src = CONVERT_TO_SHORTPTR(src8);
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uint16_t *dst = CONVERT_TO_SHORTPTR(dst8);
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src -= SUBPEL_TAPS / 2 - 1;
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for (y = 0; y < h; ++y) {
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int x_q4 = x0_q4;
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for (x = 0; x < w; ++x) {
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const uint16_t *const src_x = &src[x_q4 >> SUBPEL_BITS];
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const int16_t *const x_filter = x_filters[x_q4 & SUBPEL_MASK];
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int k, sum = 0;
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for (k = 0; k < SUBPEL_TAPS; ++k)
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sum += src_x[k] * x_filter[k];
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dst[x] = clip_pixel_highbd(ROUND_POWER_OF_TWO(sum, FILTER_BITS), bd);
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x_q4 += x_step_q4;
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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 highbd_convolve_avg_horiz(const uint8_t *src8, ptrdiff_t src_stride,
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uint8_t *dst8, ptrdiff_t dst_stride,
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const InterpKernel *x_filters,
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int x0_q4, int x_step_q4,
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int w, int h, int bd) {
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int x, y;
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uint16_t *src = CONVERT_TO_SHORTPTR(src8);
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uint16_t *dst = CONVERT_TO_SHORTPTR(dst8);
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src -= SUBPEL_TAPS / 2 - 1;
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for (y = 0; y < h; ++y) {
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int x_q4 = x0_q4;
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for (x = 0; x < w; ++x) {
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const uint16_t *const src_x = &src[x_q4 >> SUBPEL_BITS];
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const int16_t *const x_filter = x_filters[x_q4 & SUBPEL_MASK];
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int k, sum = 0;
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for (k = 0; k < SUBPEL_TAPS; ++k)
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sum += src_x[k] * x_filter[k];
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dst[x] = ROUND_POWER_OF_TWO(dst[x] +
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clip_pixel_highbd(ROUND_POWER_OF_TWO(sum, FILTER_BITS), bd), 1);
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x_q4 += x_step_q4;
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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 highbd_convolve_vert(const uint8_t *src8, ptrdiff_t src_stride,
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uint8_t *dst8, ptrdiff_t dst_stride,
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const InterpKernel *y_filters,
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int y0_q4, int y_step_q4, int w, int h,
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int bd) {
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int x, y;
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uint16_t *src = CONVERT_TO_SHORTPTR(src8);
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uint16_t *dst = CONVERT_TO_SHORTPTR(dst8);
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src -= src_stride * (SUBPEL_TAPS / 2 - 1);
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for (x = 0; x < w; ++x) {
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int y_q4 = y0_q4;
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for (y = 0; y < h; ++y) {
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const uint16_t *src_y = &src[(y_q4 >> SUBPEL_BITS) * src_stride];
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const int16_t *const y_filter = y_filters[y_q4 & SUBPEL_MASK];
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int k, sum = 0;
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for (k = 0; k < SUBPEL_TAPS; ++k)
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sum += src_y[k * src_stride] * y_filter[k];
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dst[y * dst_stride] = clip_pixel_highbd(
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ROUND_POWER_OF_TWO(sum, FILTER_BITS), bd);
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y_q4 += y_step_q4;
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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 highbd_convolve_avg_vert(const uint8_t *src8, ptrdiff_t src_stride,
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uint8_t *dst8, ptrdiff_t dst_stride,
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const InterpKernel *y_filters,
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int y0_q4, int y_step_q4, int w, int h,
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int bd) {
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int x, y;
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uint16_t *src = CONVERT_TO_SHORTPTR(src8);
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uint16_t *dst = CONVERT_TO_SHORTPTR(dst8);
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src -= src_stride * (SUBPEL_TAPS / 2 - 1);
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for (x = 0; x < w; ++x) {
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int y_q4 = y0_q4;
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for (y = 0; y < h; ++y) {
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const uint16_t *src_y = &src[(y_q4 >> SUBPEL_BITS) * src_stride];
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const int16_t *const y_filter = y_filters[y_q4 & SUBPEL_MASK];
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int k, sum = 0;
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for (k = 0; k < SUBPEL_TAPS; ++k)
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sum += src_y[k * src_stride] * y_filter[k];
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dst[y * dst_stride] = ROUND_POWER_OF_TWO(dst[y * dst_stride] +
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clip_pixel_highbd(ROUND_POWER_OF_TWO(sum, FILTER_BITS), bd), 1);
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y_q4 += y_step_q4;
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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 highbd_convolve(const uint8_t *src, ptrdiff_t src_stride,
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uint8_t *dst, ptrdiff_t dst_stride,
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const InterpKernel *const x_filters,
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int x0_q4, int x_step_q4,
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const InterpKernel *const y_filters,
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int y0_q4, int y_step_q4,
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int w, int h, int bd) {
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// Note: Fixed size intermediate buffer, temp, places limits on parameters.
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// 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.
|
|
// --64 rows in the downscaled frame span a distance of (64 - 1) * 32 in the
|
|
// original frame (in 1/16th pixel units).
|
|
// --Must round-up because block may be located at sub-pixel position.
|
|
// --Require an additional SUBPEL_TAPS rows for the 8-tap filter tails.
|
|
// --((64 - 1) * 32 + 15) >> 4 + 8 = 135.
|
|
uint16_t temp[64 * 135];
|
|
int intermediate_height =
|
|
(((h - 1) * y_step_q4 + y0_q4) >> SUBPEL_BITS) + SUBPEL_TAPS;
|
|
|
|
assert(w <= 64);
|
|
assert(h <= 64);
|
|
assert(y_step_q4 <= 32);
|
|
assert(x_step_q4 <= 32);
|
|
|
|
highbd_convolve_horiz(src - src_stride * (SUBPEL_TAPS / 2 - 1),
|
|
src_stride, CONVERT_TO_BYTEPTR(temp), 64,
|
|
x_filters, x0_q4, x_step_q4, w,
|
|
intermediate_height, bd);
|
|
highbd_convolve_vert(CONVERT_TO_BYTEPTR(temp) + 64 * (SUBPEL_TAPS / 2 - 1),
|
|
64, dst, dst_stride, y_filters, y0_q4, y_step_q4,
|
|
w, h, bd);
|
|
}
|
|
|
|
|
|
void vp9_highbd_convolve8_horiz_c(const uint8_t *src, ptrdiff_t src_stride,
|
|
uint8_t *dst, ptrdiff_t dst_stride,
|
|
const int16_t *filter_x, int x_step_q4,
|
|
const int16_t *filter_y, int y_step_q4,
|
|
int w, int h, int bd) {
|
|
const InterpKernel *const filters_x = get_filter_base(filter_x);
|
|
const int x0_q4 = get_filter_offset(filter_x, filters_x);
|
|
(void)filter_y;
|
|
(void)y_step_q4;
|
|
|
|
highbd_convolve_horiz(src, src_stride, dst, dst_stride, filters_x,
|
|
x0_q4, x_step_q4, w, h, bd);
|
|
}
|
|
|
|
void vp9_highbd_convolve8_avg_horiz_c(const uint8_t *src, ptrdiff_t src_stride,
|
|
uint8_t *dst, ptrdiff_t dst_stride,
|
|
const int16_t *filter_x, int x_step_q4,
|
|
const int16_t *filter_y, int y_step_q4,
|
|
int w, int h, int bd) {
|
|
const InterpKernel *const filters_x = get_filter_base(filter_x);
|
|
const int x0_q4 = get_filter_offset(filter_x, filters_x);
|
|
(void)filter_y;
|
|
(void)y_step_q4;
|
|
|
|
highbd_convolve_avg_horiz(src, src_stride, dst, dst_stride, filters_x,
|
|
x0_q4, x_step_q4, w, h, bd);
|
|
}
|
|
|
|
void vp9_highbd_convolve8_vert_c(const uint8_t *src, ptrdiff_t src_stride,
|
|
uint8_t *dst, ptrdiff_t dst_stride,
|
|
const int16_t *filter_x, int x_step_q4,
|
|
const int16_t *filter_y, int y_step_q4,
|
|
int w, int h, int bd) {
|
|
const InterpKernel *const filters_y = get_filter_base(filter_y);
|
|
const int y0_q4 = get_filter_offset(filter_y, filters_y);
|
|
(void)filter_x;
|
|
(void)x_step_q4;
|
|
|
|
highbd_convolve_vert(src, src_stride, dst, dst_stride, filters_y,
|
|
y0_q4, y_step_q4, w, h, bd);
|
|
}
|
|
|
|
void vp9_highbd_convolve8_avg_vert_c(const uint8_t *src, ptrdiff_t src_stride,
|
|
uint8_t *dst, ptrdiff_t dst_stride,
|
|
const int16_t *filter_x, int x_step_q4,
|
|
const int16_t *filter_y, int y_step_q4,
|
|
int w, int h, int bd) {
|
|
const InterpKernel *const filters_y = get_filter_base(filter_y);
|
|
const int y0_q4 = get_filter_offset(filter_y, filters_y);
|
|
(void)filter_x;
|
|
(void)x_step_q4;
|
|
|
|
highbd_convolve_avg_vert(src, src_stride, dst, dst_stride, filters_y,
|
|
y0_q4, y_step_q4, w, h, bd);
|
|
}
|
|
|
|
void vp9_highbd_convolve8_c(const uint8_t *src, ptrdiff_t src_stride,
|
|
uint8_t *dst, ptrdiff_t dst_stride,
|
|
const int16_t *filter_x, int x_step_q4,
|
|
const int16_t *filter_y, int y_step_q4,
|
|
int w, int h, int bd) {
|
|
const InterpKernel *const filters_x = get_filter_base(filter_x);
|
|
const int x0_q4 = get_filter_offset(filter_x, filters_x);
|
|
|
|
const InterpKernel *const filters_y = get_filter_base(filter_y);
|
|
const int y0_q4 = get_filter_offset(filter_y, filters_y);
|
|
|
|
highbd_convolve(src, src_stride, dst, dst_stride,
|
|
filters_x, x0_q4, x_step_q4,
|
|
filters_y, y0_q4, y_step_q4, w, h, bd);
|
|
}
|
|
|
|
void vp9_highbd_convolve8_avg_c(const uint8_t *src, ptrdiff_t src_stride,
|
|
uint8_t *dst, ptrdiff_t dst_stride,
|
|
const int16_t *filter_x, int x_step_q4,
|
|
const int16_t *filter_y, int y_step_q4,
|
|
int w, int h, int bd) {
|
|
// Fixed size intermediate buffer places limits on parameters.
|
|
DECLARE_ALIGNED_ARRAY(16, uint16_t, temp, 64 * 64);
|
|
assert(w <= 64);
|
|
assert(h <= 64);
|
|
|
|
vp9_highbd_convolve8_c(src, src_stride, CONVERT_TO_BYTEPTR(temp), 64,
|
|
filter_x, x_step_q4, filter_y, y_step_q4, w, h, bd);
|
|
vp9_highbd_convolve_avg_c(CONVERT_TO_BYTEPTR(temp), 64, dst, dst_stride,
|
|
NULL, 0, NULL, 0, w, h, bd);
|
|
}
|
|
|
|
void vp9_highbd_convolve_copy_c(const uint8_t *src8, ptrdiff_t src_stride,
|
|
uint8_t *dst8, ptrdiff_t dst_stride,
|
|
const int16_t *filter_x, int filter_x_stride,
|
|
const int16_t *filter_y, int filter_y_stride,
|
|
int w, int h, int bd) {
|
|
int r;
|
|
uint16_t *src = CONVERT_TO_SHORTPTR(src8);
|
|
uint16_t *dst = CONVERT_TO_SHORTPTR(dst8);
|
|
(void)filter_x;
|
|
(void)filter_y;
|
|
(void)filter_x_stride;
|
|
(void)filter_y_stride;
|
|
(void)bd;
|
|
|
|
for (r = h; r > 0; --r) {
|
|
vpx_memcpy(dst, src, w * sizeof(uint16_t));
|
|
src += src_stride;
|
|
dst += dst_stride;
|
|
}
|
|
}
|
|
|
|
void vp9_highbd_convolve_avg_c(const uint8_t *src8, ptrdiff_t src_stride,
|
|
uint8_t *dst8, ptrdiff_t dst_stride,
|
|
const int16_t *filter_x, int filter_x_stride,
|
|
const int16_t *filter_y, int filter_y_stride,
|
|
int w, int h, int bd) {
|
|
int x, y;
|
|
uint16_t *src = CONVERT_TO_SHORTPTR(src8);
|
|
uint16_t *dst = CONVERT_TO_SHORTPTR(dst8);
|
|
(void)filter_x;
|
|
(void)filter_y;
|
|
(void)filter_x_stride;
|
|
(void)filter_y_stride;
|
|
(void)bd;
|
|
|
|
for (y = 0; y < h; ++y) {
|
|
for (x = 0; x < w; ++x) {
|
|
dst[x] = ROUND_POWER_OF_TWO(dst[x] + src[x], 1);
|
|
}
|
|
src += src_stride;
|
|
dst += dst_stride;
|
|
}
|
|
}
|
|
#endif
|