241 lines
7.3 KiB
C
241 lines
7.3 KiB
C
/*
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* Copyright (c) 2010 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 "vpx_scale/vpx_scale.h"
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#include "vpx_mem/vpx_mem.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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*
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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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void vp8_horizontal_line_5_4_scale_c(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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unsigned i;
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unsigned int a, b, c, d, e;
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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; i += 5) {
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a = src[0];
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b = src[1];
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c = src[2];
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d = src[3];
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e = src[4];
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des[0] = (unsigned char) a;
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des[1] = (unsigned char)((b * 192 + c * 64 + 128) >> 8);
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des[2] = (unsigned char)((c * 128 + d * 128 + 128) >> 8);
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des[3] = (unsigned char)((d * 64 + e * 192 + 128) >> 8);
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src += 5;
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des += 4;
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}
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}
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void vp8_vertical_band_5_4_scale_c(unsigned char *source,
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unsigned int src_pitch,
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unsigned char *dest,
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unsigned int dest_pitch,
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unsigned int dest_width) {
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unsigned int i;
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unsigned int a, b, c, d, e;
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unsigned char *des = dest;
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unsigned char *src = source;
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for (i = 0; i < dest_width; i++) {
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a = src[0 * src_pitch];
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b = src[1 * src_pitch];
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c = src[2 * src_pitch];
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d = src[3 * src_pitch];
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e = src[4 * src_pitch];
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des[0 * dest_pitch] = (unsigned char) a;
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des[1 * dest_pitch] = (unsigned char)((b * 192 + c * 64 + 128) >> 8);
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des[2 * dest_pitch] = (unsigned char)((c * 128 + d * 128 + 128) >> 8);
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des[3 * dest_pitch] = (unsigned char)((d * 64 + e * 192 + 128) >> 8);
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src++;
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des++;
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}
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}
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/*7***************************************************************************
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*
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* ROUTINE : vp8_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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void vp8_horizontal_line_5_3_scale_c(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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unsigned int i;
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unsigned int a, b, c, d, e;
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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; i += 5) {
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a = src[0];
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b = src[1];
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c = src[2];
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d = src[3];
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e = src[4];
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des[0] = (unsigned char) a;
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des[1] = (unsigned char)((b * 85 + c * 171 + 128) >> 8);
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des[2] = (unsigned char)((d * 171 + e * 85 + 128) >> 8);
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src += 5;
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des += 3;
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}
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}
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void vp8_vertical_band_5_3_scale_c(unsigned char *source,
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unsigned int src_pitch,
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unsigned char *dest,
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unsigned int dest_pitch,
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unsigned int dest_width) {
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unsigned int i;
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unsigned int a, b, c, d, e;
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unsigned char *des = dest;
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unsigned char *src = source;
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for (i = 0; i < dest_width; i++) {
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a = src[0 * src_pitch];
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b = src[1 * src_pitch];
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c = src[2 * src_pitch];
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d = src[3 * src_pitch];
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e = src[4 * src_pitch];
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des[0 * dest_pitch] = (unsigned char) a;
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des[1 * dest_pitch] = (unsigned char)((b * 85 + c * 171 + 128) >> 8);
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des[2 * dest_pitch] = (unsigned char)((d * 171 + e * 85 + 128) >> 8);
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src++;
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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 : vp8_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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void vp8_horizontal_line_2_1_scale_c(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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unsigned int i;
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unsigned int a;
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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; i += 2) {
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a = src[0];
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des [0] = (unsigned char)(a);
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src += 2;
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des += 1;
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}
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}
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void vp8_vertical_band_2_1_scale_c(unsigned char *source,
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unsigned int src_pitch,
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unsigned char *dest,
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unsigned int dest_pitch,
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unsigned int dest_width) {
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(void) dest_pitch;
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(void) src_pitch;
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vpx_memcpy(dest, source, dest_width);
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}
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void vp8_vertical_band_2_1_scale_i_c(unsigned char *source,
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unsigned int src_pitch,
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unsigned char *dest,
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unsigned int dest_pitch,
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unsigned int dest_width) {
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int i;
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int temp;
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int width = dest_width;
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(void) dest_pitch;
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for (i = 0; i < width; i++) {
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temp = 8;
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temp += source[i - (int)src_pitch] * 3;
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temp += source[i] * 10;
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temp += source[i + src_pitch] * 3;
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temp >>= 4;
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dest[i] = (unsigned char)(temp);
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}
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}
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