michael@0: /*
michael@0:  *  Copyright (c) 2010 The WebM project authors. All Rights Reserved.
michael@0:  *
michael@0:  *  Use of this source code is governed by a BSD-style license
michael@0:  *  that can be found in the LICENSE file in the root of the source
michael@0:  *  tree. An additional intellectual property rights grant can be found
michael@0:  *  in the file PATENTS.  All contributing project authors may
michael@0:  *  be found in the AUTHORS file in the root of the source tree.
michael@0:  */
michael@0: 
michael@0: 
michael@0: #include "vpx_scale/vpx_scale.h"
michael@0: #include "vpx_mem/vpx_mem.h"
michael@0: /****************************************************************************
michael@0: *  Imports
michael@0: ****************************************************************************/
michael@0: 
michael@0: /****************************************************************************
michael@0:  *
michael@0:  *
michael@0:  *  INPUTS        : const unsigned char *source : Pointer to source data.
michael@0:  *                  unsigned int source_width    : Stride of source.
michael@0:  *                  unsigned char *dest         : Pointer to destination data.
michael@0:  *                  unsigned int dest_width      : Stride of destination (NOT USED).
michael@0:  *
michael@0:  *  OUTPUTS       : None.
michael@0:  *
michael@0:  *  RETURNS       : void
michael@0:  *
michael@0:  *  FUNCTION      : Copies horizontal line of pixels from source to
michael@0:  *                  destination scaling up by 4 to 5.
michael@0:  *
michael@0:  *  SPECIAL NOTES : None.
michael@0:  *
michael@0:  ****************************************************************************/
michael@0: void vp8_horizontal_line_5_4_scale_c(const unsigned char *source,
michael@0:                                      unsigned int source_width,
michael@0:                                      unsigned char *dest,
michael@0:                                      unsigned int dest_width) {
michael@0:   unsigned i;
michael@0:   unsigned int a, b, c, d, e;
michael@0:   unsigned char *des = dest;
michael@0:   const unsigned char *src = source;
michael@0: 
michael@0:   (void) dest_width;
michael@0: 
michael@0:   for (i = 0; i < source_width; i += 5) {
michael@0:     a = src[0];
michael@0:     b = src[1];
michael@0:     c = src[2];
michael@0:     d = src[3];
michael@0:     e = src[4];
michael@0: 
michael@0:     des[0] = (unsigned char) a;
michael@0:     des[1] = (unsigned char)((b * 192 + c * 64 + 128) >> 8);
michael@0:     des[2] = (unsigned char)((c * 128 + d * 128 + 128) >> 8);
michael@0:     des[3] = (unsigned char)((d * 64 + e * 192 + 128) >> 8);
michael@0: 
michael@0:     src += 5;
michael@0:     des += 4;
michael@0:   }
michael@0: }
michael@0: 
michael@0: 
michael@0: 
michael@0: 
michael@0: void vp8_vertical_band_5_4_scale_c(unsigned char *source,
michael@0:                                    unsigned int src_pitch,
michael@0:                                    unsigned char *dest,
michael@0:                                    unsigned int dest_pitch,
michael@0:                                    unsigned int dest_width) {
michael@0:   unsigned int i;
michael@0:   unsigned int a, b, c, d, e;
michael@0:   unsigned char *des = dest;
michael@0:   unsigned char *src = source;
michael@0: 
michael@0:   for (i = 0; i < dest_width; i++) {
michael@0: 
michael@0:     a = src[0 * src_pitch];
michael@0:     b = src[1 * src_pitch];
michael@0:     c = src[2 * src_pitch];
michael@0:     d = src[3 * src_pitch];
michael@0:     e = src[4 * src_pitch];
michael@0: 
michael@0:     des[0 * dest_pitch] = (unsigned char) a;
michael@0:     des[1 * dest_pitch] = (unsigned char)((b * 192 + c * 64 + 128) >> 8);
michael@0:     des[2 * dest_pitch] = (unsigned char)((c * 128 + d * 128 + 128) >> 8);
michael@0:     des[3 * dest_pitch] = (unsigned char)((d * 64 + e * 192 + 128) >> 8);
michael@0: 
michael@0:     src++;
michael@0:     des++;
michael@0: 
michael@0:   }
michael@0: }
michael@0: 
michael@0: 
michael@0: /*7***************************************************************************
michael@0:  *
michael@0:  *  ROUTINE       : vp8_horizontal_line_3_5_scale_c
michael@0:  *
michael@0:  *  INPUTS        : const unsigned char *source : Pointer to source data.
michael@0:  *                  unsigned int source_width    : Stride of source.
michael@0:  *                  unsigned char *dest         : Pointer to destination data.
michael@0:  *                  unsigned int dest_width      : Stride of destination (NOT USED).
michael@0:  *
michael@0:  *  OUTPUTS       : None.
michael@0:  *
michael@0:  *  RETURNS       : void
michael@0:  *
michael@0:  *  FUNCTION      : Copies horizontal line of pixels from source to
michael@0:  *                  destination scaling up by 3 to 5.
michael@0:  *
michael@0:  *  SPECIAL NOTES : None.
michael@0:  *
michael@0:  *
michael@0:  ****************************************************************************/
michael@0: void vp8_horizontal_line_5_3_scale_c(const unsigned char *source,
michael@0:                                      unsigned int source_width,
michael@0:                                      unsigned char *dest,
michael@0:                                      unsigned int dest_width) {
michael@0:   unsigned int i;
michael@0:   unsigned int a, b, c, d, e;
michael@0:   unsigned char *des = dest;
michael@0:   const unsigned char *src = source;
michael@0: 
michael@0:   (void) dest_width;
michael@0: 
michael@0:   for (i = 0; i < source_width; i += 5) {
michael@0:     a = src[0];
michael@0:     b = src[1];
michael@0:     c = src[2];
michael@0:     d = src[3];
michael@0:     e = src[4];
michael@0: 
michael@0:     des[0] = (unsigned char) a;
michael@0:     des[1] = (unsigned char)((b * 85  + c * 171 + 128) >> 8);
michael@0:     des[2] = (unsigned char)((d * 171 + e * 85 + 128) >> 8);
michael@0: 
michael@0:     src += 5;
michael@0:     des += 3;
michael@0:   }
michael@0: 
michael@0: }
michael@0: 
michael@0: void vp8_vertical_band_5_3_scale_c(unsigned char *source,
michael@0:                                    unsigned int src_pitch,
michael@0:                                    unsigned char *dest,
michael@0:                                    unsigned int dest_pitch,
michael@0:                                    unsigned int dest_width) {
michael@0:   unsigned int i;
michael@0:   unsigned int a, b, c, d, e;
michael@0:   unsigned char *des = dest;
michael@0:   unsigned char *src = source;
michael@0: 
michael@0:   for (i = 0; i < dest_width; i++) {
michael@0: 
michael@0:     a = src[0 * src_pitch];
michael@0:     b = src[1 * src_pitch];
michael@0:     c = src[2 * src_pitch];
michael@0:     d = src[3 * src_pitch];
michael@0:     e = src[4 * src_pitch];
michael@0: 
michael@0:     des[0 * dest_pitch] = (unsigned char) a;
michael@0:     des[1 * dest_pitch] = (unsigned char)((b * 85 + c * 171 + 128) >> 8);
michael@0:     des[2 * dest_pitch] = (unsigned char)((d * 171 + e * 85 + 128) >> 8);
michael@0: 
michael@0:     src++;
michael@0:     des++;
michael@0: 
michael@0:   }
michael@0: }
michael@0: 
michael@0: /****************************************************************************
michael@0:  *
michael@0:  *  ROUTINE       : vp8_horizontal_line_1_2_scale_c
michael@0:  *
michael@0:  *  INPUTS        : const unsigned char *source : Pointer to source data.
michael@0:  *                  unsigned int source_width    : Stride of source.
michael@0:  *                  unsigned char *dest         : Pointer to destination data.
michael@0:  *                  unsigned int dest_width      : Stride of destination (NOT USED).
michael@0:  *
michael@0:  *  OUTPUTS       : None.
michael@0:  *
michael@0:  *  RETURNS       : void
michael@0:  *
michael@0:  *  FUNCTION      : Copies horizontal line of pixels from source to
michael@0:  *                  destination scaling up by 1 to 2.
michael@0:  *
michael@0:  *  SPECIAL NOTES : None.
michael@0:  *
michael@0:  ****************************************************************************/
michael@0: void vp8_horizontal_line_2_1_scale_c(const unsigned char *source,
michael@0:                                      unsigned int source_width,
michael@0:                                      unsigned char *dest,
michael@0:                                      unsigned int dest_width) {
michael@0:   unsigned int i;
michael@0:   unsigned int a;
michael@0:   unsigned char *des = dest;
michael@0:   const unsigned char *src = source;
michael@0: 
michael@0:   (void) dest_width;
michael@0: 
michael@0:   for (i = 0; i < source_width; i += 2) {
michael@0:     a = src[0];
michael@0:     des [0] = (unsigned char)(a);
michael@0:     src += 2;
michael@0:     des += 1;
michael@0:   }
michael@0: }
michael@0: 
michael@0: void vp8_vertical_band_2_1_scale_c(unsigned char *source,
michael@0:                                    unsigned int src_pitch,
michael@0:                                    unsigned char *dest,
michael@0:                                    unsigned int dest_pitch,
michael@0:                                    unsigned int dest_width) {
michael@0:   (void) dest_pitch;
michael@0:   (void) src_pitch;
michael@0:   vpx_memcpy(dest, source, dest_width);
michael@0: }
michael@0: 
michael@0: void vp8_vertical_band_2_1_scale_i_c(unsigned char *source,
michael@0:                                      unsigned int src_pitch,
michael@0:                                      unsigned char *dest,
michael@0:                                      unsigned int dest_pitch,
michael@0:                                      unsigned int dest_width) {
michael@0:   int i;
michael@0:   int temp;
michael@0:   int width = dest_width;
michael@0: 
michael@0:   (void) dest_pitch;
michael@0: 
michael@0:   for (i = 0; i < width; i++) {
michael@0:     temp = 8;
michael@0:     temp += source[i - (int)src_pitch] * 3;
michael@0:     temp += source[i] * 10;
michael@0:     temp += source[i + src_pitch] * 3;
michael@0:     temp >>= 4;
michael@0:     dest[i] = (unsigned char)(temp);
michael@0:   }
michael@0: }