ref: a2192701b1ff5f79bc53f75199f2d9e3bc42df12
dir: /vpx_scale/generic/gen_scalers.c/
/* * 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 "./vpx_scale_rtcd.h" #include "vpx_scale/vpx_scale.h" #include "vpx_mem/vpx_mem.h" /**************************************************************************** * Imports ****************************************************************************/ /**************************************************************************** * * * INPUTS : const unsigned char *source : Pointer to source data. * unsigned int source_width : Stride of source. * unsigned char *dest : Pointer to destination data. * unsigned int dest_width : Stride of dest (UNUSED). * * OUTPUTS : None. * * RETURNS : void * * FUNCTION : Copies horizontal line of pixels from source to * destination scaling up by 4 to 5. * * SPECIAL NOTES : None. * ****************************************************************************/ void vp8_horizontal_line_5_4_scale_c(const unsigned char *source, unsigned int source_width, unsigned char *dest, unsigned int dest_width) { unsigned i; unsigned int a, b, c, d, e; unsigned char *des = dest; const unsigned char *src = source; (void)dest_width; for (i = 0; i < source_width; i += 5) { a = src[0]; b = src[1]; c = src[2]; d = src[3]; e = src[4]; des[0] = (unsigned char)a; des[1] = (unsigned char)((b * 192 + c * 64 + 128) >> 8); des[2] = (unsigned char)((c * 128 + d * 128 + 128) >> 8); des[3] = (unsigned char)((d * 64 + e * 192 + 128) >> 8); src += 5; des += 4; } } void vp8_vertical_band_5_4_scale_c(unsigned char *source, unsigned int src_pitch, unsigned char *dest, unsigned int dest_pitch, unsigned int dest_width) { unsigned int i; unsigned int a, b, c, d, e; unsigned char *des = dest; unsigned char *src = source; for (i = 0; i < dest_width; i++) { a = src[0 * src_pitch]; b = src[1 * src_pitch]; c = src[2 * src_pitch]; d = src[3 * src_pitch]; e = src[4 * src_pitch]; des[0 * dest_pitch] = (unsigned char)a; des[1 * dest_pitch] = (unsigned char)((b * 192 + c * 64 + 128) >> 8); des[2 * dest_pitch] = (unsigned char)((c * 128 + d * 128 + 128) >> 8); des[3 * dest_pitch] = (unsigned char)((d * 64 + e * 192 + 128) >> 8); src++; des++; } } /*7*************************************************************************** * * ROUTINE : vp8_horizontal_line_3_5_scale_c * * INPUTS : const unsigned char *source : Pointer to source data. * unsigned int source_width : Stride of source. * unsigned char *dest : Pointer to destination data. * unsigned int dest_width : Stride of dest (UNUSED). * * OUTPUTS : None. * * RETURNS : void * * FUNCTION : Copies horizontal line of pixels from source to * destination scaling up by 3 to 5. * * SPECIAL NOTES : None. * * ****************************************************************************/ void vp8_horizontal_line_5_3_scale_c(const unsigned char *source, unsigned int source_width, unsigned char *dest, unsigned int dest_width) { unsigned int i; unsigned int a, b, c, d, e; unsigned char *des = dest; const unsigned char *src = source; (void)dest_width; for (i = 0; i < source_width; i += 5) { a = src[0]; b = src[1]; c = src[2]; d = src[3]; e = src[4]; des[0] = (unsigned char)a; des[1] = (unsigned char)((b * 85 + c * 171 + 128) >> 8); des[2] = (unsigned char)((d * 171 + e * 85 + 128) >> 8); src += 5; des += 3; } } void vp8_vertical_band_5_3_scale_c(unsigned char *source, unsigned int src_pitch, unsigned char *dest, unsigned int dest_pitch, unsigned int dest_width) { unsigned int i; unsigned int a, b, c, d, e; unsigned char *des = dest; unsigned char *src = source; for (i = 0; i < dest_width; i++) { a = src[0 * src_pitch]; b = src[1 * src_pitch]; c = src[2 * src_pitch]; d = src[3 * src_pitch]; e = src[4 * src_pitch]; des[0 * dest_pitch] = (unsigned char)a; des[1 * dest_pitch] = (unsigned char)((b * 85 + c * 171 + 128) >> 8); des[2 * dest_pitch] = (unsigned char)((d * 171 + e * 85 + 128) >> 8); src++; des++; } } /**************************************************************************** * * ROUTINE : vp8_horizontal_line_1_2_scale_c * * INPUTS : const unsigned char *source : Pointer to source data. * unsigned int source_width : Stride of source. * unsigned char *dest : Pointer to destination data. * unsigned int dest_width : Stride of dest (UNUSED). * * OUTPUTS : None. * * RETURNS : void * * FUNCTION : Copies horizontal line of pixels from source to * destination scaling up by 1 to 2. * * SPECIAL NOTES : None. * ****************************************************************************/ void vp8_horizontal_line_2_1_scale_c(const unsigned char *source, unsigned int source_width, unsigned char *dest, unsigned int dest_width) { unsigned int i; unsigned int a; unsigned char *des = dest; const unsigned char *src = source; (void)dest_width; for (i = 0; i < source_width; i += 2) { a = src[0]; des[0] = (unsigned char)(a); src += 2; des += 1; } } void vp8_vertical_band_2_1_scale_c(unsigned char *source, unsigned int src_pitch, unsigned char *dest, unsigned int dest_pitch, unsigned int dest_width) { (void)dest_pitch; (void)src_pitch; memcpy(dest, source, dest_width); } void vp8_vertical_band_2_1_scale_i_c(unsigned char *source, unsigned int src_pitch, unsigned char *dest, unsigned int dest_pitch, unsigned int dest_width) { int i; int temp; int width = dest_width; (void)dest_pitch; for (i = 0; i < width; i++) { temp = 8; temp += source[i - (int)src_pitch] * 3; temp += source[i] * 10; temp += source[i + src_pitch] * 3; temp >>= 4; dest[i] = (unsigned char)(temp); } }