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/*
* Copyright (C) 2011 The Android Open Source Project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
/**
******************************************************************************
* @file M4VIFI_ResizeYUV420toYUV420.c
* @brief Contain video library function
* @note This file has a Resize filter function
* -# Generic resizing of YUV420 (Planar) image
******************************************************************************
*/
/* Prototypes of functions, and type definitions */
#include "M4VIFI_FiltersAPI.h"
/* Macro definitions */
#include "M4VIFI_Defines.h"
/* Clip table declaration */
#include "M4VIFI_Clip.h"
/**
***********************************************************************************************
* M4VIFI_UInt8 M4VIFI_ResizeBilinearRGB888toRGB888(void *pUserData, M4VIFI_ImagePlane *pPlaneIn,
* M4VIFI_ImagePlane *pPlaneOut)
* @brief Resizes YUV420 Planar plane.
* @note Basic structure of the function
* Loop on each row (step 2)
* Loop on each column (step 2)
* Get four Y samples and 1 U & V sample
* Resize the Y with corresponing U and V samples
* Place the YUV in the ouput plane
* end loop column
* end loop row
* For resizing bilinear interpolation linearly interpolates along
* each row, and then uses that result in a linear interpolation down each column.
* Each estimated pixel in the output image is a weighted
* combination of its four neighbours. The ratio of compression
* or dilatation is estimated using input and output sizes.
* @param pUserData: (IN) User Data
* @param pPlaneIn: (IN) Pointer to YUV420 (Planar) plane buffer
* @param pPlaneOut: (OUT) Pointer to YUV420 (Planar) plane
* @return M4VIFI_OK: there is no error
* @return M4VIFI_ILLEGAL_FRAME_HEIGHT: Error in height
* @return M4VIFI_ILLEGAL_FRAME_WIDTH: Error in width
***********************************************************************************************
*/
M4VIFI_UInt8 M4VIFI_ResizeBilinearRGB888toRGB888(void *pUserData,
M4VIFI_ImagePlane *pPlaneIn,
M4VIFI_ImagePlane *pPlaneOut)
{
M4VIFI_UInt8 *pu8_data_in;
M4VIFI_UInt8 *pu8_data_out;
M4VIFI_UInt32 u32_width_in, u32_width_out, u32_height_in, u32_height_out;
M4VIFI_UInt32 u32_stride_in, u32_stride_out;
M4VIFI_UInt32 u32_x_inc, u32_y_inc;
M4VIFI_UInt32 u32_x_accum, u32_y_accum, u32_x_accum_start;
M4VIFI_UInt32 u32_width, u32_height;
M4VIFI_UInt32 u32_y_frac;
M4VIFI_UInt32 u32_x_frac;
M4VIFI_UInt32 u32_Rtemp_value,u32_Gtemp_value,u32_Btemp_value;
M4VIFI_UInt8 *pu8_src_top;
M4VIFI_UInt8 *pu8_src_bottom;
M4VIFI_UInt32 i32_b00, i32_g00, i32_r00;
M4VIFI_UInt32 i32_b01, i32_g01, i32_r01;
M4VIFI_UInt32 i32_b02, i32_g02, i32_r02;
M4VIFI_UInt32 i32_b03, i32_g03, i32_r03;
/* Check for the YUV width and height are even */
if ((IS_EVEN(pPlaneIn->u_height) == FALSE) ||
(IS_EVEN(pPlaneOut->u_height) == FALSE))
{
return M4VIFI_ILLEGAL_FRAME_HEIGHT;
}
if ((IS_EVEN(pPlaneIn->u_width) == FALSE) ||
(IS_EVEN(pPlaneOut->u_width) == FALSE))
{
return M4VIFI_ILLEGAL_FRAME_WIDTH;
}
/* Set the working pointers at the beginning of the input/output data field */
pu8_data_in = (M4VIFI_UInt8*)(pPlaneIn->pac_data + pPlaneIn->u_topleft);
pu8_data_out = (M4VIFI_UInt8*)(pPlaneOut->pac_data + pPlaneOut->u_topleft);
/* Get the memory jump corresponding to a row jump */
u32_stride_in = pPlaneIn->u_stride;
u32_stride_out = pPlaneOut->u_stride;
/* Set the bounds of the active image */
u32_width_in = pPlaneIn->u_width;
u32_height_in = pPlaneIn->u_height;
u32_width_out = pPlaneOut->u_width;
u32_height_out = pPlaneOut->u_height;
/* Compute horizontal ratio between src and destination width.*/
if (u32_width_out >= u32_width_in)
{
u32_x_inc = ((u32_width_in-1) * MAX_SHORT) / (u32_width_out-1);
}
else
{
u32_x_inc = (u32_width_in * MAX_SHORT) / (u32_width_out);
}
/* Compute vertical ratio between src and destination height.*/
if (u32_height_out >= u32_height_in)
{
u32_y_inc = ((u32_height_in - 1) * MAX_SHORT) / (u32_height_out-1);
}
else
{
u32_y_inc = (u32_height_in * MAX_SHORT) / (u32_height_out);
}
/*
Calculate initial accumulator value : u32_y_accum_start.
u32_y_accum_start is coded on 15 bits, and represents a value between 0 and 0.5
*/
if (u32_y_inc >= MAX_SHORT)
{
/*
Keep the fractionnal part, assimung that integer part is coded
on the 16 high bits and the fractionnal on the 15 low bits
*/
u32_y_accum = u32_y_inc & 0xffff;
if (!u32_y_accum)
{
u32_y_accum = MAX_SHORT;
}
u32_y_accum >>= 1;
}
else
{
u32_y_accum = 0;
}
/*
Calculate initial accumulator value : u32_x_accum_start.
u32_x_accum_start is coded on 15 bits, and represents a value between 0 and 0.5
*/
if (u32_x_inc >= MAX_SHORT)
{
u32_x_accum_start = u32_x_inc & 0xffff;
if (!u32_x_accum_start)
{
u32_x_accum_start = MAX_SHORT;
}
u32_x_accum_start >>= 1;
}
else
{
u32_x_accum_start = 0;
}
u32_height = u32_height_out;
/*
Bilinear interpolation linearly interpolates along each row, and then uses that
result in a linear interpolation donw each column. Each estimated pixel in the
output image is a weighted combination of its four neighbours according to the formula:
F(p',q')=f(p,q)R(-a)R(b)+f(p,q-1)R(-a)R(b-1)+f(p+1,q)R(1-a)R(b)+f(p+&,q+1)R(1-a)R(b-1)
with R(x) = / x+1 -1 =< x =< 0 \ 1-x 0 =< x =< 1 and a (resp. b)weighting coefficient
is the distance from the nearest neighbor in the p (resp. q) direction
*/
do { /* Scan all the row */
/* Vertical weight factor */
u32_y_frac = (u32_y_accum>>12)&15;
/* Reinit accumulator */
u32_x_accum = u32_x_accum_start;
u32_width = u32_width_out;
do { /* Scan along each row */
pu8_src_top = pu8_data_in + (u32_x_accum >> 16)*3;
pu8_src_bottom = pu8_src_top + (u32_stride_in);
u32_x_frac = (u32_x_accum >> 12)&15; /* Horizontal weight factor */
if ((u32_width == 1) && (u32_width_in == u32_width_out)) {
/*
When input height is equal to output height and input width
equal to output width, replicate the corner pixels for
interpolation
*/
if ((u32_height == 1) && (u32_height_in == u32_height_out)) {
GET_RGB24(i32_b00,i32_g00,i32_r00,pu8_src_top,0);
GET_RGB24(i32_b01,i32_g01,i32_r01,pu8_src_top,0);
GET_RGB24(i32_b02,i32_g02,i32_r02,pu8_src_top,0);
GET_RGB24(i32_b03,i32_g03,i32_r03,pu8_src_top,0);
}
/*
When input height is not equal to output height and
input width equal to output width, replicate the
column for interpolation
*/
else {
GET_RGB24(i32_b00,i32_g00,i32_r00,pu8_src_top,0);
GET_RGB24(i32_b01,i32_g01,i32_r01,pu8_src_top,0);
GET_RGB24(i32_b02,i32_g02,i32_r02,pu8_src_bottom,0);
GET_RGB24(i32_b03,i32_g03,i32_r03,pu8_src_bottom,0);
}
} else {
/*
When input height is equal to output height and
input width not equal to output width, replicate the
row for interpolation
*/
if ((u32_height == 1) && (u32_height_in == u32_height_out)) {
GET_RGB24(i32_b00,i32_g00,i32_r00,pu8_src_top,0);
GET_RGB24(i32_b01,i32_g01,i32_r01,pu8_src_top,3);
GET_RGB24(i32_b02,i32_g02,i32_r02,pu8_src_top,0);
GET_RGB24(i32_b03,i32_g03,i32_r03,pu8_src_top,3);
} else {
GET_RGB24(i32_b00,i32_g00,i32_r00,pu8_src_top,0);
GET_RGB24(i32_b01,i32_g01,i32_r01,pu8_src_top,3);
GET_RGB24(i32_b02,i32_g02,i32_r02,pu8_src_bottom,0);
GET_RGB24(i32_b03,i32_g03,i32_r03,pu8_src_bottom,3);
}
}
u32_Rtemp_value = (M4VIFI_UInt8)(((i32_r00*(16-u32_x_frac) +
i32_r01*u32_x_frac)*(16-u32_y_frac) +
(i32_r02*(16-u32_x_frac) +
i32_r03*u32_x_frac)*u32_y_frac )>>8);
u32_Gtemp_value = (M4VIFI_UInt8)(((i32_g00*(16-u32_x_frac) +
i32_g01*u32_x_frac)*(16-u32_y_frac) +
(i32_g02*(16-u32_x_frac) +
i32_g03*u32_x_frac)*u32_y_frac )>>8);
u32_Btemp_value = (M4VIFI_UInt8)(((i32_b00*(16-u32_x_frac) +
i32_b01*u32_x_frac)*(16-u32_y_frac) +
(i32_b02*(16-u32_x_frac) +
i32_b03*u32_x_frac)*u32_y_frac )>>8);
*pu8_data_out++ = u32_Btemp_value ;
*pu8_data_out++ = u32_Gtemp_value ;
*pu8_data_out++ = u32_Rtemp_value ;
/* Update horizontal accumulator */
u32_x_accum += u32_x_inc;
} while(--u32_width);
//pu16_data_out = pu16_data_out + (u32_stride_out>>1) - (u32_width_out);
/* Update vertical accumulator */
u32_y_accum += u32_y_inc;
if (u32_y_accum>>16)
{
pu8_data_in = pu8_data_in + (u32_y_accum >> 16) * (u32_stride_in) ;
u32_y_accum &= 0xffff;
}
} while(--u32_height);
return M4VIFI_OK;
}
/* End of file M4VIFI_ResizeRGB565toRGB565.c */
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