| /* |
| * 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 <stdlib.h> |
| |
| #define BLOCK_HEIGHT_WIDTH 4 |
| #define VP8_FILTER_WEIGHT 128 |
| #define VP8_FILTER_SHIFT 7 |
| |
| |
| static const int bilinear_filters[8][2] = |
| { |
| { 128, 0 }, |
| { 112, 16 }, |
| { 96, 32 }, |
| { 80, 48 }, |
| { 64, 64 }, |
| { 48, 80 }, |
| { 32, 96 }, |
| { 16, 112 } |
| }; |
| |
| |
| static const short 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 }, |
| |
| |
| |
| }; |
| |
| void vp8_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; |
| } |
| } |
| |
| void vp8_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; |
| } |
| } |
| |
| |
| void vp8_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 bufffer used in filtering |
| |
| // First filter 1-D horizontally... |
| vp8_filter_block2d_first_pass(src_ptr - (2 * src_pixels_per_line), FData, src_pixels_per_line, 1, 9, 4, HFilter); |
| |
| // then filter verticaly... |
| vp8_filter_block2d_second_pass(FData + 8, output_ptr, output_pitch, 4, 4, 4, 4, VFilter); |
| } |
| |
| |
| void vp8_block_variation_c |
| ( |
| unsigned char *src_ptr, |
| int src_pixels_per_line, |
| int *HVar, |
| int *VVar |
| ) |
| { |
| int i, j; |
| unsigned char *Ptr = src_ptr; |
| |
| for (i = 0; i < 4; i++) |
| { |
| for (j = 0; j < 4; j++) |
| { |
| *HVar += abs((int)Ptr[j] - (int)Ptr[j+1]); |
| *VVar += abs((int)Ptr[j] - (int)Ptr[j+src_pixels_per_line]); |
| } |
| |
| Ptr += src_pixels_per_line; |
| } |
| } |
| |
| |
| |
| |
| void vp8_sixtap_predict_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 = sub_pel_filters[xoffset]; // 6 tap |
| VFilter = sub_pel_filters[yoffset]; // 6 tap |
| |
| vp8_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 bufffer used in filtering |
| |
| HFilter = sub_pel_filters[xoffset]; // 6 tap |
| VFilter = sub_pel_filters[yoffset]; // 6 tap |
| |
| // First filter 1-D horizontally... |
| vp8_filter_block2d_first_pass(src_ptr - (2 * src_pixels_per_line), FData, src_pixels_per_line, 1, 13, 8, HFilter); |
| |
| |
| // then filter verticaly... |
| vp8_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 bufffer used in filtering |
| |
| HFilter = sub_pel_filters[xoffset]; // 6 tap |
| VFilter = sub_pel_filters[yoffset]; // 6 tap |
| |
| // First filter 1-D horizontally... |
| vp8_filter_block2d_first_pass(src_ptr - (2 * src_pixels_per_line), FData, src_pixels_per_line, 1, 9, 8, HFilter); |
| |
| |
| // then filter verticaly... |
| vp8_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 bufffer used in filtering |
| |
| |
| HFilter = sub_pel_filters[xoffset]; // 6 tap |
| VFilter = sub_pel_filters[yoffset]; // 6 tap |
| |
| // First filter 1-D horizontally... |
| vp8_filter_block2d_first_pass(src_ptr - (2 * src_pixels_per_line), FData, src_pixels_per_line, 1, 21, 16, HFilter); |
| |
| // then filter verticaly... |
| vp8_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_pixels_per_line : Stride of input block. |
| * UINT32 pixel_step : Offset between filter input samples (see notes). |
| * UINT32 output_height : Input block height. |
| * UINT32 output_width : Input block width. |
| * INT32 *vp8_filter : Array of 2 bi-linear filter taps. |
| * |
| * OUTPUTS : INT32 *output_ptr : Pointer to filtered block. |
| * |
| * RETURNS : void |
| * |
| * FUNCTION : Applies a 1-D 2-tap bi-linear filter to the source block in |
| * either horizontal or vertical 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. |
| * pixel_step defines whether the filter is applied |
| * horizontally (pixel_step=1) or vertically (pixel_step=stride). |
| * It defines the offset required to move from one input |
| * to the next. |
| * |
| ****************************************************************************/ |
| void vp8_filter_block2d_bil_first_pass |
| ( |
| unsigned char *src_ptr, |
| unsigned short *output_ptr, |
| unsigned int src_pixels_per_line, |
| int pixel_step, |
| unsigned int output_height, |
| unsigned int output_width, |
| const int *vp8_filter |
| ) |
| { |
| unsigned int i, j; |
| |
| for (i = 0; i < output_height; i++) |
| { |
| for (j = 0; j < output_width; j++) |
| { |
| // Apply bilinear filter |
| output_ptr[j] = (((int)src_ptr[0] * vp8_filter[0]) + |
| ((int)src_ptr[pixel_step] * vp8_filter[1]) + |
| (VP8_FILTER_WEIGHT / 2)) >> VP8_FILTER_SHIFT; |
| src_ptr++; |
| } |
| |
| // Next row... |
| src_ptr += src_pixels_per_line - output_width; |
| output_ptr += output_width; |
| } |
| } |
| |
| /**************************************************************************** |
| * |
| * ROUTINE : filter_block2d_bil_second_pass |
| * |
| * INPUTS : INT32 *src_ptr : Pointer to source block. |
| * UINT32 src_pixels_per_line : Stride of input block. |
| * UINT32 pixel_step : Offset between filter input samples (see notes). |
| * UINT32 output_height : Input block height. |
| * UINT32 output_width : Input block width. |
| * INT32 *vp8_filter : Array of 2 bi-linear filter taps. |
| * |
| * OUTPUTS : UINT16 *output_ptr : Pointer to filtered block. |
| * |
| * RETURNS : void |
| * |
| * FUNCTION : Applies a 1-D 2-tap bi-linear filter to the source block in |
| * either horizontal or 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. |
| * pixel_step defines whether the filter is applied |
| * horizontally (pixel_step=1) or vertically (pixel_step=stride). |
| * It defines the offset required to move from one input |
| * to the next. |
| * |
| ****************************************************************************/ |
| void vp8_filter_block2d_bil_second_pass |
| ( |
| unsigned short *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 int *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[0] * vp8_filter[0]) + |
| ((int)src_ptr[pixel_step] * vp8_filter[1]) + |
| (VP8_FILTER_WEIGHT / 2); |
| output_ptr[j] = (unsigned int)(Temp >> VP8_FILTER_SHIFT); |
| src_ptr++; |
| } |
| |
| // Next row... |
| src_ptr += src_pixels_per_line - output_width; |
| output_ptr += output_pitch; |
| } |
| } |
| |
| |
| /**************************************************************************** |
| * |
| * ROUTINE : filter_block2d_bil |
| * |
| * INPUTS : UINT8 *src_ptr : Pointer to source block. |
| * UINT32 src_pixels_per_line : Stride of input block. |
| * INT32 *HFilter : Array of 2 horizontal filter taps. |
| * INT32 *VFilter : Array of 2 vertical filter taps. |
| * |
| * OUTPUTS : UINT16 *output_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 |
| * |
| ****************************************************************************/ |
| void vp8_filter_block2d_bil |
| ( |
| unsigned char *src_ptr, |
| unsigned char *output_ptr, |
| unsigned int src_pixels_per_line, |
| unsigned int dst_pitch, |
| const int *HFilter, |
| const int *VFilter, |
| int Width, |
| int Height |
| ) |
| { |
| |
| unsigned short FData[17*16]; // Temp data bufffer used in filtering |
| |
| // First filter 1-D horizontally... |
| vp8_filter_block2d_bil_first_pass(src_ptr, FData, src_pixels_per_line, 1, Height + 1, Width, HFilter); |
| |
| // then 1-D vertically... |
| vp8_filter_block2d_bil_second_pass(FData, output_ptr, dst_pitch, Width, Width, 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 int *HFilter; |
| const int *VFilter; |
| |
| HFilter = bilinear_filters[xoffset]; |
| VFilter = bilinear_filters[yoffset]; |
| #if 0 |
| { |
| int i; |
| unsigned char temp1[16]; |
| unsigned char temp2[16]; |
| |
| bilinear_predict4x4_mmx(src_ptr, src_pixels_per_line, xoffset, yoffset, temp1, 4); |
| vp8_filter_block2d_bil(src_ptr, temp2, src_pixels_per_line, 4, HFilter, VFilter, 4, 4); |
| |
| for (i = 0; i < 16; i++) |
| { |
| if (temp1[i] != temp2[i]) |
| { |
| bilinear_predict4x4_mmx(src_ptr, src_pixels_per_line, xoffset, yoffset, temp1, 4); |
| vp8_filter_block2d_bil(src_ptr, temp2, src_pixels_per_line, 4, HFilter, VFilter, 4, 4); |
| } |
| } |
| } |
| #endif |
| vp8_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 int *HFilter; |
| const int *VFilter; |
| |
| HFilter = bilinear_filters[xoffset]; |
| VFilter = bilinear_filters[yoffset]; |
| |
| vp8_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 int *HFilter; |
| const int *VFilter; |
| |
| HFilter = bilinear_filters[xoffset]; |
| VFilter = bilinear_filters[yoffset]; |
| |
| vp8_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 int *HFilter; |
| const int *VFilter; |
| |
| HFilter = bilinear_filters[xoffset]; |
| VFilter = bilinear_filters[yoffset]; |
| |
| vp8_filter_block2d_bil(src_ptr, dst_ptr, src_pixels_per_line, dst_pitch, HFilter, VFilter, 16, 16); |
| } |
