| /* |
| * Copyright (c) 2010 The WebM project authors. All Rights Reserved. |
| * |
| * Use of this source code is governed by a BSD-style license |
| * that can be found in the LICENSE file in the root of the source |
| * tree. An additional intellectual property rights grant can be found |
| * in the file PATENTS. All contributing project authors may |
| * be found in the AUTHORS file in the root of the source tree. |
| */ |
| |
| #include <assert.h> |
| #include "./vp8_rtcd.h" |
| #include "vp8/common/filter.h" |
| |
| DECLARE_ALIGNED(16, const short, vp8_bilinear_filters[8][2]) = { |
| { 128, 0 }, { 112, 16 }, { 96, 32 }, { 80, 48 }, |
| { 64, 64 }, { 48, 80 }, { 32, 96 }, { 16, 112 } |
| }; |
| |
| DECLARE_ALIGNED(16, const short, vp8_sub_pel_filters[8][6]) = { |
| |
| { 0, 0, 128, 0, 0, |
| 0 }, /* note that 1/8 pel positions are just as per alpha -0.5 bicubic */ |
| { 0, -6, 123, 12, -1, 0 }, |
| { 2, -11, 108, 36, -8, 1 }, /* New 1/4 pel 6 tap filter */ |
| { 0, -9, 93, 50, -6, 0 }, |
| { 3, -16, 77, 77, -16, 3 }, /* New 1/2 pel 6 tap filter */ |
| { 0, -6, 50, 93, -9, 0 }, |
| { 1, -8, 36, 108, -11, 2 }, /* New 1/4 pel 6 tap filter */ |
| { 0, -1, 12, 123, -6, 0 }, |
| }; |
| |
| static void filter_block2d_first_pass(unsigned char *src_ptr, int *output_ptr, |
| unsigned int src_pixels_per_line, |
| unsigned int pixel_step, |
| unsigned int output_height, |
| unsigned int output_width, |
| const short *vp8_filter) { |
| unsigned int i, j; |
| int Temp; |
| |
| for (i = 0; i < output_height; ++i) { |
| for (j = 0; j < output_width; ++j) { |
| Temp = ((int)src_ptr[-2 * (int)pixel_step] * vp8_filter[0]) + |
| ((int)src_ptr[-1 * (int)pixel_step] * vp8_filter[1]) + |
| ((int)src_ptr[0] * vp8_filter[2]) + |
| ((int)src_ptr[pixel_step] * vp8_filter[3]) + |
| ((int)src_ptr[2 * pixel_step] * vp8_filter[4]) + |
| ((int)src_ptr[3 * pixel_step] * vp8_filter[5]) + |
| (VP8_FILTER_WEIGHT >> 1); /* Rounding */ |
| |
| /* Normalize back to 0-255 */ |
| Temp = Temp >> VP8_FILTER_SHIFT; |
| |
| if (Temp < 0) { |
| Temp = 0; |
| } else if (Temp > 255) { |
| Temp = 255; |
| } |
| |
| output_ptr[j] = Temp; |
| src_ptr++; |
| } |
| |
| /* Next row... */ |
| src_ptr += src_pixels_per_line - output_width; |
| output_ptr += output_width; |
| } |
| } |
| |
| static void filter_block2d_second_pass(int *src_ptr, unsigned char *output_ptr, |
| int output_pitch, |
| unsigned int src_pixels_per_line, |
| unsigned int pixel_step, |
| unsigned int output_height, |
| unsigned int output_width, |
| const short *vp8_filter) { |
| unsigned int i, j; |
| int Temp; |
| |
| for (i = 0; i < output_height; ++i) { |
| for (j = 0; j < output_width; ++j) { |
| /* Apply filter */ |
| Temp = ((int)src_ptr[-2 * (int)pixel_step] * vp8_filter[0]) + |
| ((int)src_ptr[-1 * (int)pixel_step] * vp8_filter[1]) + |
| ((int)src_ptr[0] * vp8_filter[2]) + |
| ((int)src_ptr[pixel_step] * vp8_filter[3]) + |
| ((int)src_ptr[2 * pixel_step] * vp8_filter[4]) + |
| ((int)src_ptr[3 * pixel_step] * vp8_filter[5]) + |
| (VP8_FILTER_WEIGHT >> 1); /* Rounding */ |
| |
| /* Normalize back to 0-255 */ |
| Temp = Temp >> VP8_FILTER_SHIFT; |
| |
| if (Temp < 0) { |
| Temp = 0; |
| } else if (Temp > 255) { |
| Temp = 255; |
| } |
| |
| output_ptr[j] = (unsigned char)Temp; |
| src_ptr++; |
| } |
| |
| /* Start next row */ |
| src_ptr += src_pixels_per_line - output_width; |
| output_ptr += output_pitch; |
| } |
| } |
| |
| static void filter_block2d(unsigned char *src_ptr, unsigned char *output_ptr, |
| unsigned int src_pixels_per_line, int output_pitch, |
| const short *HFilter, const short *VFilter) { |
| int FData[9 * 4]; /* Temp data buffer used in filtering */ |
| |
| /* First filter 1-D horizontally... */ |
| filter_block2d_first_pass(src_ptr - (2 * src_pixels_per_line), FData, |
| src_pixels_per_line, 1, 9, 4, HFilter); |
| |
| /* then filter verticaly... */ |
| filter_block2d_second_pass(FData + 8, output_ptr, output_pitch, 4, 4, 4, 4, |
| VFilter); |
| } |
| |
| void vp8_sixtap_predict4x4_c(unsigned char *src_ptr, int src_pixels_per_line, |
| int xoffset, int yoffset, unsigned char *dst_ptr, |
| int dst_pitch) { |
| const short *HFilter; |
| const short *VFilter; |
| |
| HFilter = vp8_sub_pel_filters[xoffset]; /* 6 tap */ |
| VFilter = vp8_sub_pel_filters[yoffset]; /* 6 tap */ |
| |
| filter_block2d(src_ptr, dst_ptr, src_pixels_per_line, dst_pitch, HFilter, |
| VFilter); |
| } |
| void vp8_sixtap_predict8x8_c(unsigned char *src_ptr, int src_pixels_per_line, |
| int xoffset, int yoffset, unsigned char *dst_ptr, |
| int dst_pitch) { |
| const short *HFilter; |
| const short *VFilter; |
| int FData[13 * 16]; /* Temp data buffer used in filtering */ |
| |
| HFilter = vp8_sub_pel_filters[xoffset]; /* 6 tap */ |
| VFilter = vp8_sub_pel_filters[yoffset]; /* 6 tap */ |
| |
| /* First filter 1-D horizontally... */ |
| filter_block2d_first_pass(src_ptr - (2 * src_pixels_per_line), FData, |
| src_pixels_per_line, 1, 13, 8, HFilter); |
| |
| /* then filter verticaly... */ |
| filter_block2d_second_pass(FData + 16, dst_ptr, dst_pitch, 8, 8, 8, 8, |
| VFilter); |
| } |
| |
| void vp8_sixtap_predict8x4_c(unsigned char *src_ptr, int src_pixels_per_line, |
| int xoffset, int yoffset, unsigned char *dst_ptr, |
| int dst_pitch) { |
| const short *HFilter; |
| const short *VFilter; |
| int FData[13 * 16]; /* Temp data buffer used in filtering */ |
| |
| HFilter = vp8_sub_pel_filters[xoffset]; /* 6 tap */ |
| VFilter = vp8_sub_pel_filters[yoffset]; /* 6 tap */ |
| |
| /* First filter 1-D horizontally... */ |
| filter_block2d_first_pass(src_ptr - (2 * src_pixels_per_line), FData, |
| src_pixels_per_line, 1, 9, 8, HFilter); |
| |
| /* then filter verticaly... */ |
| filter_block2d_second_pass(FData + 16, dst_ptr, dst_pitch, 8, 8, 4, 8, |
| VFilter); |
| } |
| |
| void vp8_sixtap_predict16x16_c(unsigned char *src_ptr, int src_pixels_per_line, |
| int xoffset, int yoffset, unsigned char *dst_ptr, |
| int dst_pitch) { |
| const short *HFilter; |
| const short *VFilter; |
| int FData[21 * 24]; /* Temp data buffer used in filtering */ |
| |
| HFilter = vp8_sub_pel_filters[xoffset]; /* 6 tap */ |
| VFilter = vp8_sub_pel_filters[yoffset]; /* 6 tap */ |
| |
| /* First filter 1-D horizontally... */ |
| filter_block2d_first_pass(src_ptr - (2 * src_pixels_per_line), FData, |
| src_pixels_per_line, 1, 21, 16, HFilter); |
| |
| /* then filter verticaly... */ |
| filter_block2d_second_pass(FData + 32, dst_ptr, dst_pitch, 16, 16, 16, 16, |
| VFilter); |
| } |
| |
| /**************************************************************************** |
| * |
| * ROUTINE : filter_block2d_bil_first_pass |
| * |
| * INPUTS : UINT8 *src_ptr : Pointer to source block. |
| * UINT32 src_stride : Stride of source block. |
| * UINT32 height : Block height. |
| * UINT32 width : Block width. |
| * INT32 *vp8_filter : Array of 2 bi-linear filter taps. |
| * |
| * OUTPUTS : INT32 *dst_ptr : Pointer to filtered block. |
| * |
| * RETURNS : void |
| * |
| * FUNCTION : Applies a 1-D 2-tap bi-linear filter to the source block |
| * in the horizontal direction to produce the filtered output |
| * block. Used to implement first-pass of 2-D separable filter. |
| * |
| * SPECIAL NOTES : Produces INT32 output to retain precision for next pass. |
| * Two filter taps should sum to VP8_FILTER_WEIGHT. |
| * |
| ****************************************************************************/ |
| static void filter_block2d_bil_first_pass( |
| unsigned char *src_ptr, unsigned short *dst_ptr, unsigned int src_stride, |
| unsigned int height, unsigned int width, const short *vp8_filter) { |
| unsigned int i, j; |
| |
| for (i = 0; i < height; ++i) { |
| for (j = 0; j < width; ++j) { |
| /* Apply bilinear filter */ |
| dst_ptr[j] = |
| (((int)src_ptr[0] * vp8_filter[0]) + |
| ((int)src_ptr[1] * vp8_filter[1]) + (VP8_FILTER_WEIGHT / 2)) >> |
| VP8_FILTER_SHIFT; |
| src_ptr++; |
| } |
| |
| /* Next row... */ |
| src_ptr += src_stride - width; |
| dst_ptr += width; |
| } |
| } |
| |
| /**************************************************************************** |
| * |
| * ROUTINE : filter_block2d_bil_second_pass |
| * |
| * INPUTS : INT32 *src_ptr : Pointer to source block. |
| * UINT32 dst_pitch : Destination block pitch. |
| * UINT32 height : Block height. |
| * UINT32 width : Block width. |
| * INT32 *vp8_filter : Array of 2 bi-linear filter taps. |
| * |
| * OUTPUTS : UINT16 *dst_ptr : Pointer to filtered block. |
| * |
| * RETURNS : void |
| * |
| * FUNCTION : Applies a 1-D 2-tap bi-linear filter to the source block |
| * in the vertical direction to produce the filtered output |
| * block. Used to implement second-pass of 2-D separable |
| * filter. |
| * |
| * SPECIAL NOTES : Requires 32-bit input as produced by |
| * filter_block2d_bil_first_pass. |
| * Two filter taps should sum to VP8_FILTER_WEIGHT. |
| * |
| ****************************************************************************/ |
| static void filter_block2d_bil_second_pass(unsigned short *src_ptr, |
| unsigned char *dst_ptr, |
| int dst_pitch, unsigned int height, |
| unsigned int width, |
| const short *vp8_filter) { |
| unsigned int i, j; |
| int Temp; |
| |
| for (i = 0; i < height; ++i) { |
| for (j = 0; j < width; ++j) { |
| /* Apply filter */ |
| Temp = ((int)src_ptr[0] * vp8_filter[0]) + |
| ((int)src_ptr[width] * vp8_filter[1]) + (VP8_FILTER_WEIGHT / 2); |
| dst_ptr[j] = (unsigned int)(Temp >> VP8_FILTER_SHIFT); |
| src_ptr++; |
| } |
| |
| /* Next row... */ |
| dst_ptr += dst_pitch; |
| } |
| } |
| |
| /**************************************************************************** |
| * |
| * ROUTINE : filter_block2d_bil |
| * |
| * INPUTS : UINT8 *src_ptr : Pointer to source block. |
| * UINT32 src_pitch : Stride of source block. |
| * UINT32 dst_pitch : Stride of destination block. |
| * INT32 *HFilter : Array of 2 horizontal filter |
| * taps. |
| * INT32 *VFilter : Array of 2 vertical filter taps. |
| * INT32 Width : Block width |
| * INT32 Height : Block height |
| * |
| * OUTPUTS : UINT16 *dst_ptr : Pointer to filtered block. |
| * |
| * RETURNS : void |
| * |
| * FUNCTION : 2-D filters an input block by applying a 2-tap |
| * bi-linear filter horizontally followed by a 2-tap |
| * bi-linear filter vertically on the result. |
| * |
| * SPECIAL NOTES : The largest block size can be handled here is 16x16 |
| * |
| ****************************************************************************/ |
| static void filter_block2d_bil(unsigned char *src_ptr, unsigned char *dst_ptr, |
| unsigned int src_pitch, unsigned int dst_pitch, |
| const short *HFilter, const short *VFilter, |
| int Width, int Height) { |
| unsigned short FData[17 * 16]; /* Temp data buffer used in filtering */ |
| |
| /* First filter 1-D horizontally... */ |
| filter_block2d_bil_first_pass(src_ptr, FData, src_pitch, Height + 1, Width, |
| HFilter); |
| |
| /* then 1-D vertically... */ |
| filter_block2d_bil_second_pass(FData, dst_ptr, dst_pitch, Height, Width, |
| VFilter); |
| } |
| |
| void vp8_bilinear_predict4x4_c(unsigned char *src_ptr, int src_pixels_per_line, |
| int xoffset, int yoffset, unsigned char *dst_ptr, |
| int dst_pitch) { |
| const short *HFilter; |
| const short *VFilter; |
| |
| // This represents a copy and is not required to be handled by optimizations. |
| assert((xoffset | yoffset) != 0); |
| |
| HFilter = vp8_bilinear_filters[xoffset]; |
| VFilter = vp8_bilinear_filters[yoffset]; |
| filter_block2d_bil(src_ptr, dst_ptr, src_pixels_per_line, dst_pitch, HFilter, |
| VFilter, 4, 4); |
| } |
| |
| void vp8_bilinear_predict8x8_c(unsigned char *src_ptr, int src_pixels_per_line, |
| int xoffset, int yoffset, unsigned char *dst_ptr, |
| int dst_pitch) { |
| const short *HFilter; |
| const short *VFilter; |
| |
| assert((xoffset | yoffset) != 0); |
| |
| HFilter = vp8_bilinear_filters[xoffset]; |
| VFilter = vp8_bilinear_filters[yoffset]; |
| |
| filter_block2d_bil(src_ptr, dst_ptr, src_pixels_per_line, dst_pitch, HFilter, |
| VFilter, 8, 8); |
| } |
| |
| void vp8_bilinear_predict8x4_c(unsigned char *src_ptr, int src_pixels_per_line, |
| int xoffset, int yoffset, unsigned char *dst_ptr, |
| int dst_pitch) { |
| const short *HFilter; |
| const short *VFilter; |
| |
| assert((xoffset | yoffset) != 0); |
| |
| HFilter = vp8_bilinear_filters[xoffset]; |
| VFilter = vp8_bilinear_filters[yoffset]; |
| |
| filter_block2d_bil(src_ptr, dst_ptr, src_pixels_per_line, dst_pitch, HFilter, |
| VFilter, 8, 4); |
| } |
| |
| void vp8_bilinear_predict16x16_c(unsigned char *src_ptr, |
| int src_pixels_per_line, int xoffset, |
| int yoffset, unsigned char *dst_ptr, |
| int dst_pitch) { |
| const short *HFilter; |
| const short *VFilter; |
| |
| assert((xoffset | yoffset) != 0); |
| |
| HFilter = vp8_bilinear_filters[xoffset]; |
| VFilter = vp8_bilinear_filters[yoffset]; |
| |
| filter_block2d_bil(src_ptr, dst_ptr, src_pixels_per_line, dst_pitch, HFilter, |
| VFilter, 16, 16); |
| } |
