523 lines
16 KiB
C
523 lines
16 KiB
C
/*
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* Copyright (c) 2010 The VP8 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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/****************************************************************************
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*
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* Module Title : gen_scalers.c
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*
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* Description : Generic image scaling functions.
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*
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***************************************************************************/
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/****************************************************************************
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* Header Files
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****************************************************************************/
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#include "vpx_scale/vpxscale.h"
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/****************************************************************************
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* Imports
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****************************************************************************/
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/****************************************************************************
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*
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* ROUTINE : vp8cx_horizontal_line_4_5_scale_c
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*
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* INPUTS : const unsigned char *source : Pointer to source data.
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* unsigned int source_width : Stride of source.
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* unsigned char *dest : Pointer to destination data.
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* unsigned int dest_width : Stride of destination (NOT USED).
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*
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* OUTPUTS : None.
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*
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* RETURNS : void
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*
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* FUNCTION : Copies horizontal line of pixels from source to
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* destination scaling up by 4 to 5.
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*
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* SPECIAL NOTES : None.
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*
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****************************************************************************/
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static
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void vp8cx_horizontal_line_4_5_scale_c
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(
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const unsigned char *source,
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unsigned int source_width,
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unsigned char *dest,
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unsigned int dest_width
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)
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{
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unsigned i;
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unsigned int a, b, c;
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unsigned char *des = dest;
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const unsigned char *src = source;
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(void) dest_width;
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for (i = 0; i < source_width - 4; i += 4)
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{
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a = src[0];
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b = src[1];
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des [0] = (unsigned char) a;
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des [1] = (unsigned char)((a * 51 + 205 * b + 128) >> 8);
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c = src[2] * 154;
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a = src[3];
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des [2] = (unsigned char)((b * 102 + c + 128) >> 8);
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des [3] = (unsigned char)((c + 102 * a + 128) >> 8);
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b = src[4];
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des [4] = (unsigned char)((a * 205 + 51 * b + 128) >> 8);
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src += 4;
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des += 5;
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}
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a = src[0];
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b = src[1];
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des [0] = (unsigned char)(a);
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des [1] = (unsigned char)((a * 51 + 205 * b + 128) >> 8);
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c = src[2] * 154;
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a = src[3];
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des [2] = (unsigned char)((b * 102 + c + 128) >> 8);
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des [3] = (unsigned char)((c + 102 * a + 128) >> 8);
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des [4] = (unsigned char)(a);
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}
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/****************************************************************************
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*
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* ROUTINE : vp8cx_vertical_band_4_5_scale_c
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*
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* INPUTS : unsigned char *dest : Pointer to destination data.
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* unsigned int dest_pitch : Stride of destination data.
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* unsigned int dest_width : Width of destination data.
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*
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* OUTPUTS : None.
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*
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* RETURNS : void
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*
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* FUNCTION : Scales vertical band of pixels by scale 4 to 5. The
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* height of the band scaled is 4-pixels.
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*
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* SPECIAL NOTES : The routine uses the first line of the band below
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* the current band.
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*
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****************************************************************************/
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static
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void vp8cx_vertical_band_4_5_scale_c(unsigned char *dest, unsigned int dest_pitch, unsigned int dest_width)
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{
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unsigned int i;
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unsigned int a, b, c, d;
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unsigned char *des = dest;
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for (i = 0; i < dest_width; i++)
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{
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a = des [0];
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b = des [dest_pitch];
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des[dest_pitch] = (unsigned char)((a * 51 + 205 * b + 128) >> 8);
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c = des[dest_pitch*2] * 154;
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d = des[dest_pitch*3];
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des [dest_pitch*2] = (unsigned char)((b * 102 + c + 128) >> 8);
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des [dest_pitch*3] = (unsigned char)((c + 102 * d + 128) >> 8);
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// First line in next band
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a = des [dest_pitch * 5];
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des [dest_pitch * 4] = (unsigned char)((d * 205 + 51 * a + 128) >> 8);
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des ++;
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}
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}
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/****************************************************************************
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*
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* ROUTINE : vp8cx_last_vertical_band_4_5_scale_c
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*
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* INPUTS : unsigned char *dest : Pointer to destination data.
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* unsigned int dest_pitch : Stride of destination data.
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* unsigned int dest_width : Width of destination data.
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*
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* OUTPUTS : None.
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*
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* RETURNS : void
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*
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* FUNCTION : Scales last vertical band of pixels by scale 4 to 5. The
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* height of the band scaled is 4-pixels.
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*
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* SPECIAL NOTES : The routine does not have available the first line of
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* the band below the current band, since this is the
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* last band.
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*
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****************************************************************************/
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static
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void vp8cx_last_vertical_band_4_5_scale_c(unsigned char *dest, unsigned int dest_pitch, unsigned int dest_width)
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{
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unsigned int i;
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unsigned int a, b, c, d;
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unsigned char *des = dest;
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for (i = 0; i < dest_width; ++i)
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{
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a = des[0];
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b = des[dest_pitch];
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des[dest_pitch] = (unsigned char)((a * 51 + 205 * b + 128) >> 8);
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c = des[dest_pitch*2] * 154;
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d = des[dest_pitch*3];
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des [dest_pitch*2] = (unsigned char)((b * 102 + c + 128) >> 8);
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des [dest_pitch*3] = (unsigned char)((c + 102 * d + 128) >> 8);
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// No other line for interplation of this line, so ..
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des[dest_pitch*4] = (unsigned char) d;
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des++;
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}
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}
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/****************************************************************************
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*
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* ROUTINE : vp8cx_horizontal_line_3_5_scale_c
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*
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* INPUTS : const unsigned char *source : Pointer to source data.
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* unsigned int source_width : Stride of source.
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* unsigned char *dest : Pointer to destination data.
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* unsigned int dest_width : Stride of destination (NOT USED).
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*
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* OUTPUTS : None.
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*
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* RETURNS : void
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*
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* FUNCTION : Copies horizontal line of pixels from source to
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* destination scaling up by 3 to 5.
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*
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* SPECIAL NOTES : None.
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*
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*
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****************************************************************************/
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static
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void vp8cx_horizontal_line_3_5_scale_c
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(
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const unsigned char *source,
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unsigned int source_width,
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unsigned char *dest,
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unsigned int dest_width
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)
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{
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unsigned int i;
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unsigned int a, b, c;
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unsigned char *des = dest;
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const unsigned char *src = source;
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(void) dest_width;
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for (i = 0; i < source_width - 3; i += 3)
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{
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a = src[0];
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b = src[1];
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des [0] = (unsigned char)(a);
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des [1] = (unsigned char)((a * 102 + 154 * b + 128) >> 8);
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c = src[2] ;
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des [2] = (unsigned char)((b * 205 + c * 51 + 128) >> 8);
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des [3] = (unsigned char)((b * 51 + c * 205 + 128) >> 8);
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a = src[3];
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des [4] = (unsigned char)((c * 154 + a * 102 + 128) >> 8);
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src += 3;
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des += 5;
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}
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a = src[0];
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b = src[1];
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des [0] = (unsigned char)(a);
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des [1] = (unsigned char)((a * 102 + 154 * b + 128) >> 8);
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c = src[2] ;
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des [2] = (unsigned char)((b * 205 + c * 51 + 128) >> 8);
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des [3] = (unsigned char)((b * 51 + c * 205 + 128) >> 8);
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des [4] = (unsigned char)(c);
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}
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/****************************************************************************
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*
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* ROUTINE : vp8cx_vertical_band_3_5_scale_c
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*
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* INPUTS : unsigned char *dest : Pointer to destination data.
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* unsigned int dest_pitch : Stride of destination data.
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* unsigned int dest_width : Width of destination data.
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*
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* OUTPUTS : None.
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*
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* RETURNS : void
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*
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* FUNCTION : Scales vertical band of pixels by scale 3 to 5. The
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* height of the band scaled is 3-pixels.
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*
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* SPECIAL NOTES : The routine uses the first line of the band below
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* the current band.
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*
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****************************************************************************/
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static
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void vp8cx_vertical_band_3_5_scale_c(unsigned char *dest, unsigned int dest_pitch, unsigned int dest_width)
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{
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unsigned int i;
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unsigned int a, b, c;
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unsigned char *des = dest;
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for (i = 0; i < dest_width; i++)
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{
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a = des [0];
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b = des [dest_pitch];
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des [dest_pitch] = (unsigned char)((a * 102 + 154 * b + 128) >> 8);
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c = des[dest_pitch*2];
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des [dest_pitch*2] = (unsigned char)((b * 205 + c * 51 + 128) >> 8);
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des [dest_pitch*3] = (unsigned char)((b * 51 + c * 205 + 128) >> 8);
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// First line in next band...
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a = des [dest_pitch * 5];
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des [dest_pitch * 4] = (unsigned char)((c * 154 + a * 102 + 128) >> 8);
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des++;
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}
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}
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/****************************************************************************
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*
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* ROUTINE : vp8cx_last_vertical_band_3_5_scale_c
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*
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* INPUTS : unsigned char *dest : Pointer to destination data.
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* unsigned int dest_pitch : Stride of destination data.
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* unsigned int dest_width : Width of destination data.
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*
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* OUTPUTS : None.
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*
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* RETURNS : void
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*
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* FUNCTION : Scales last vertical band of pixels by scale 3 to 5. The
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* height of the band scaled is 3-pixels.
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*
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* SPECIAL NOTES : The routine does not have available the first line of
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* the band below the current band, since this is the
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* last band.
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*
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****************************************************************************/
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static
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void vp8cx_last_vertical_band_3_5_scale_c(unsigned char *dest, unsigned int dest_pitch, unsigned int dest_width)
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{
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unsigned int i;
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unsigned int a, b, c;
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unsigned char *des = dest;
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for (i = 0; i < dest_width; ++i)
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{
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a = des [0];
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b = des [dest_pitch];
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des [ dest_pitch ] = (unsigned char)((a * 102 + 154 * b + 128) >> 8);
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c = des[dest_pitch*2];
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des [dest_pitch*2] = (unsigned char)((b * 205 + c * 51 + 128) >> 8);
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des [dest_pitch*3] = (unsigned char)((b * 51 + c * 205 + 128) >> 8);
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// No other line for interplation of this line, so ..
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des [ dest_pitch * 4 ] = (unsigned char)(c) ;
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des++;
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}
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}
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/****************************************************************************
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*
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* ROUTINE : vp8cx_horizontal_line_1_2_scale_c
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*
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* INPUTS : const unsigned char *source : Pointer to source data.
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* unsigned int source_width : Stride of source.
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* unsigned char *dest : Pointer to destination data.
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* unsigned int dest_width : Stride of destination (NOT USED).
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*
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* OUTPUTS : None.
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*
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* RETURNS : void
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*
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* FUNCTION : Copies horizontal line of pixels from source to
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* destination scaling up by 1 to 2.
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*
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* SPECIAL NOTES : None.
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*
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****************************************************************************/
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static
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void vp8cx_horizontal_line_1_2_scale_c
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(
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const unsigned char *source,
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unsigned int source_width,
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unsigned char *dest,
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unsigned int dest_width
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)
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{
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unsigned int i;
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unsigned int a, b;
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unsigned char *des = dest;
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const unsigned char *src = source;
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(void) dest_width;
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for (i = 0; i < source_width - 1; i += 1)
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{
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a = src[0];
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b = src[1];
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des [0] = (unsigned char)(a);
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des [1] = (unsigned char)((a + b + 1) >> 1);
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src += 1;
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des += 2;
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}
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a = src[0];
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des [0] = (unsigned char)(a);
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des [1] = (unsigned char)(a);
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}
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/****************************************************************************
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*
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* ROUTINE : vp8cx_vertical_band_1_2_scale_c
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*
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* INPUTS : unsigned char *dest : Pointer to destination data.
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* unsigned int dest_pitch : Stride of destination data.
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* unsigned int dest_width : Width of destination data.
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*
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* OUTPUTS : None.
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*
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* RETURNS : void
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*
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* FUNCTION : Scales vertical band of pixels by scale 1 to 2. The
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* height of the band scaled is 1-pixel.
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*
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* SPECIAL NOTES : The routine uses the first line of the band below
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* the current band.
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*
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****************************************************************************/
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static
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void vp8cx_vertical_band_1_2_scale_c(unsigned char *dest, unsigned int dest_pitch, unsigned int dest_width)
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{
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unsigned int i;
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unsigned int a, b;
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unsigned char *des = dest;
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for (i = 0; i < dest_width; i++)
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{
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a = des [0];
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b = des [dest_pitch * 2];
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des[dest_pitch] = (unsigned char)((a + b + 1) >> 1);
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des++;
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}
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}
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/****************************************************************************
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*
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* ROUTINE : vp8cx_last_vertical_band_1_2_scale_c
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*
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* INPUTS : unsigned char *dest : Pointer to destination data.
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* unsigned int dest_pitch : Stride of destination data.
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* unsigned int dest_width : Width of destination data.
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*
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* OUTPUTS : None.
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*
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* RETURNS : void
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*
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* FUNCTION : Scales last vertical band of pixels by scale 1 to 2. The
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* height of the band scaled is 1-pixel.
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*
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* SPECIAL NOTES : The routine does not have available the first line of
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* the band below the current band, since this is the
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* last band.
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*
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****************************************************************************/
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static
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void vp8cx_last_vertical_band_1_2_scale_c(unsigned char *dest, unsigned int dest_pitch, unsigned int dest_width)
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{
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unsigned int i;
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unsigned char *des = dest;
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for (i = 0; i < dest_width; ++i)
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{
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des[dest_pitch] = des[0];
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des++;
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}
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}
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#include "vpx_scale/vpxscale.h"
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#include "vpx_mem/vpx_mem.h"
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struct vpxglobal_scalling_ptrs_t *g_scaling_ptrs = 0;
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int
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register_generic_scalers(void)
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{
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int rv = 0;
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g_scaling_ptrs = (struct vpxglobal_scalling_ptrs_t *)vpx_malloc(sizeof(struct vpxglobal_scalling_ptrs_t));
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if (g_scaling_ptrs)
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{
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g_scaling_ptrs->vpxhorizontal_line_1_2_scale_t = vp8cx_horizontal_line_1_2_scale_c;
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g_scaling_ptrs->vpxvertical_band_1_2_scale_t = vp8cx_vertical_band_1_2_scale_c;
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g_scaling_ptrs->vpxlast_vertical_band_1_2_scale_t = vp8cx_last_vertical_band_1_2_scale_c;
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g_scaling_ptrs->vpxhorizontal_line_3_5_scale_t = vp8cx_horizontal_line_3_5_scale_c;
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g_scaling_ptrs->vpxvertical_band_3_5_scale_t = vp8cx_vertical_band_3_5_scale_c;
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g_scaling_ptrs->vpxlast_vertical_band_3_5_scale_t = vp8cx_last_vertical_band_3_5_scale_c;
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g_scaling_ptrs->vpxhorizontal_line_4_5_scale_t = vp8cx_horizontal_line_4_5_scale_c;
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g_scaling_ptrs->vpxvertical_band_4_5_scale_t = vp8cx_vertical_band_4_5_scale_c;
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g_scaling_ptrs->vpxlast_vertical_band_4_5_scale_t = vp8cx_last_vertical_band_4_5_scale_c;
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}
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else
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{
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rv = -1;
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}
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/*
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vp8_horizontal_line_1_2_scale = vp8cx_horizontal_line_1_2_scale_c;
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vp8_vertical_band_1_2_scale = vp8cx_vertical_band_1_2_scale_c;
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vp8_last_vertical_band_1_2_scale = vp8cx_last_vertical_band_1_2_scale_c;
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vp8_horizontal_line_3_5_scale = vp8cx_horizontal_line_3_5_scale_c;
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vp8_vertical_band_3_5_scale = vp8cx_vertical_band_3_5_scale_c;
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vp8_last_vertical_band_3_5_scale = vp8cx_last_vertical_band_3_5_scale_c;
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vp8_horizontal_line_4_5_scale = vp8cx_horizontal_line_4_5_scale_c;
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vp8_vertical_band_4_5_scale = vp8cx_vertical_band_4_5_scale_c;
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vp8_last_vertical_band_4_5_scale = vp8cx_last_vertical_band_4_5_scale_c;
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*/
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return rv;
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}
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int
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de_register_generic_scalers(void)
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{
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int rv = 0;
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if (g_scaling_ptrs)
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{
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vpx_free(g_scaling_ptrs);
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g_scaling_ptrs = 0;
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}
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else
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{
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rv = -1;
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}
|
|
|
|
return rv;
|
|
}
|