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Diffstat (limited to 'vpx_scale/generic/gen_scalers.c')
| -rw-r--r-- | vpx_scale/generic/gen_scalers.c | 954 |
1 files changed, 954 insertions, 0 deletions
diff --git a/vpx_scale/generic/gen_scalers.c b/vpx_scale/generic/gen_scalers.c new file mode 100644 index 000000000..a5e545f70 --- /dev/null +++ b/vpx_scale/generic/gen_scalers.c @@ -0,0 +1,954 @@ +/* + * Copyright (c) 2010 The VP8 project authors. All Rights Reserved. + * + * Use of this source code is governed by a BSD-style license and patent + * grant that can be found in the LICENSE file in the root of the source + * tree. All contributing project authors may be found in the AUTHORS + * file in the root of the source tree. + */ + + +#include "vpx_scale/vpxscale.h" +#include "vpx_mem/vpx_mem.h" +/**************************************************************************** +* Imports +****************************************************************************/ + +/**************************************************************************** + * + * ROUTINE : vp8cx_horizontal_line_4_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 destination (NOT USED). + * + * OUTPUTS : None. + * + * RETURNS : void + * + * FUNCTION : Copies horizontal line of pixels from source to + * destination scaling up by 4 to 5. + * + * SPECIAL NOTES : None. + * + ****************************************************************************/ +void vp8cx_horizontal_line_4_5_scale_c +( + const unsigned char *source, + unsigned int source_width, + unsigned char *dest, + unsigned int dest_width +) +{ + unsigned i; + unsigned int a, b, c; + unsigned char *des = dest; + const unsigned char *src = source; + + (void) dest_width; + + for (i = 0; i < source_width - 4; i += 4) + { + a = src[0]; + b = src[1]; + des [0] = (unsigned char) a; + des [1] = (unsigned char)((a * 51 + 205 * b + 128) >> 8); + c = src[2] * 154; + a = src[3]; + des [2] = (unsigned char)((b * 102 + c + 128) >> 8); + des [3] = (unsigned char)((c + 102 * a + 128) >> 8); + b = src[4]; + des [4] = (unsigned char)((a * 205 + 51 * b + 128) >> 8); + + src += 4; + des += 5; + } + + a = src[0]; + b = src[1]; + des [0] = (unsigned char)(a); + des [1] = (unsigned char)((a * 51 + 205 * b + 128) >> 8); + c = src[2] * 154; + a = src[3]; + des [2] = (unsigned char)((b * 102 + c + 128) >> 8); + des [3] = (unsigned char)((c + 102 * a + 128) >> 8); + des [4] = (unsigned char)(a); + +} + +/**************************************************************************** + * + * ROUTINE : vp8cx_vertical_band_4_5_scale_c + * + * INPUTS : unsigned char *dest : Pointer to destination data. + * unsigned int dest_pitch : Stride of destination data. + * unsigned int dest_width : Width of destination data. + * + * OUTPUTS : None. + * + * RETURNS : void + * + * FUNCTION : Scales vertical band of pixels by scale 4 to 5. The + * height of the band scaled is 4-pixels. + * + * SPECIAL NOTES : The routine uses the first line of the band below + * the current band. + * + ****************************************************************************/ +void vp8cx_vertical_band_4_5_scale_c(unsigned char *dest, unsigned int dest_pitch, unsigned int dest_width) +{ + unsigned int i; + unsigned int a, b, c, d; + unsigned char *des = dest; + + for (i = 0; i < dest_width; i++) + { + a = des [0]; + b = des [dest_pitch]; + + des[dest_pitch] = (unsigned char)((a * 51 + 205 * b + 128) >> 8); + + c = des[dest_pitch*2] * 154; + d = des[dest_pitch*3]; + + des [dest_pitch*2] = (unsigned char)((b * 102 + c + 128) >> 8); + des [dest_pitch*3] = (unsigned char)((c + 102 * d + 128) >> 8); + + // First line in next band + a = des [dest_pitch * 5]; + des [dest_pitch * 4] = (unsigned char)((d * 205 + 51 * a + 128) >> 8); + + des ++; + } +} + +/**************************************************************************** + * + * ROUTINE : vp8cx_last_vertical_band_4_5_scale_c + * + * INPUTS : unsigned char *dest : Pointer to destination data. + * unsigned int dest_pitch : Stride of destination data. + * unsigned int dest_width : Width of destination data. + * + * OUTPUTS : None. + * + * RETURNS : void + * + * FUNCTION : Scales last vertical band of pixels by scale 4 to 5. The + * height of the band scaled is 4-pixels. + * + * SPECIAL NOTES : The routine does not have available the first line of + * the band below the current band, since this is the + * last band. + * + ****************************************************************************/ +void vp8cx_last_vertical_band_4_5_scale_c(unsigned char *dest, unsigned int dest_pitch, unsigned int dest_width) +{ + unsigned int i; + unsigned int a, b, c, d; + unsigned char *des = dest; + + for (i = 0; i < dest_width; ++i) + { + a = des[0]; + b = des[dest_pitch]; + + des[dest_pitch] = (unsigned char)((a * 51 + 205 * b + 128) >> 8); + + c = des[dest_pitch*2] * 154; + d = des[dest_pitch*3]; + + des [dest_pitch*2] = (unsigned char)((b * 102 + c + 128) >> 8); + des [dest_pitch*3] = (unsigned char)((c + 102 * d + 128) >> 8); + + // No other line for interplation of this line, so .. + des[dest_pitch*4] = (unsigned char) d; + + des++; + } +} + +/**************************************************************************** + * + * ROUTINE : vp8cx_horizontal_line_2_3_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 destination (NOT USED). + * + * OUTPUTS : None. + * + * RETURNS : void + * + * FUNCTION : Copies horizontal line of pixels from source to + * destination scaling up by 2 to 3. + * + * SPECIAL NOTES : None. + * + * + ****************************************************************************/ +void vp8cx_horizontal_line_2_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; + unsigned char *des = dest; + const unsigned char *src = source; + + (void) dest_width; + + for (i = 0; i < source_width - 2; i += 2) + { + a = src[0]; + b = src[1]; + c = src[2]; + + des [0] = (unsigned char)(a); + des [1] = (unsigned char)((a * 85 + 171 * b + 128) >> 8); + des [2] = (unsigned char)((b * 171 + 85 * c + 128) >> 8); + + src += 2; + des += 3; + } + + a = src[0]; + b = src[1]; + des [0] = (unsigned char)(a); + des [1] = (unsigned char)((a * 85 + 171 * b + 128) >> 8); + des [2] = (unsigned char)(b); +} + + +/**************************************************************************** + * + * ROUTINE : vp8cx_vertical_band_2_3_scale_c + * + * INPUTS : unsigned char *dest : Pointer to destination data. + * unsigned int dest_pitch : Stride of destination data. + * unsigned int dest_width : Width of destination data. + * + * OUTPUTS : None. + * + * RETURNS : void + * + * FUNCTION : Scales vertical band of pixels by scale 2 to 3. The + * height of the band scaled is 2-pixels. + * + * SPECIAL NOTES : The routine uses the first line of the band below + * the current band. + * + ****************************************************************************/ +void vp8cx_vertical_band_2_3_scale_c(unsigned char *dest, unsigned int dest_pitch, unsigned int dest_width) +{ + unsigned int i; + unsigned int a, b, c; + unsigned char *des = dest; + + for (i = 0; i < dest_width; i++) + { + a = des [0]; + b = des [dest_pitch]; + c = des[dest_pitch*3]; + des [dest_pitch ] = (unsigned char)((a * 85 + 171 * b + 128) >> 8); + des [dest_pitch*2] = (unsigned char)((b * 171 + 85 * c + 128) >> 8); + + des++; + } +} + +/**************************************************************************** + * + * ROUTINE : vp8cx_last_vertical_band_2_3_scale_c + * + * INPUTS : unsigned char *dest : Pointer to destination data. + * unsigned int dest_pitch : Stride of destination data. + * unsigned int dest_width : Width of destination data. + * + * OUTPUTS : None. + * + * RETURNS : void + * + * FUNCTION : Scales last vertical band of pixels by scale 2 to 3. The + * height of the band scaled is 2-pixels. + * + * SPECIAL NOTES : The routine does not have available the first line of + * the band below the current band, since this is the + * last band. + * + ****************************************************************************/ +void vp8cx_last_vertical_band_2_3_scale_c(unsigned char *dest, unsigned int dest_pitch, unsigned int dest_width) +{ + unsigned int i; + unsigned int a, b; + unsigned char *des = dest; + + for (i = 0; i < dest_width; ++i) + { + a = des [0]; + b = des [dest_pitch]; + + des [dest_pitch ] = (unsigned char)((a * 85 + 171 * b + 128) >> 8); + des [dest_pitch*2] = (unsigned char)(b); + des++; + } +} + +/**************************************************************************** + * + * ROUTINE : vp8cx_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 destination (NOT USED). + * + * OUTPUTS : None. + * + * RETURNS : void + * + * FUNCTION : Copies horizontal line of pixels from source to + * destination scaling up by 3 to 5. + * + * SPECIAL NOTES : None. + * + * + ****************************************************************************/ +void vp8cx_horizontal_line_3_5_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; + unsigned char *des = dest; + const unsigned char *src = source; + + (void) dest_width; + + for (i = 0; i < source_width - 3; i += 3) + { + a = src[0]; + b = src[1]; + des [0] = (unsigned char)(a); + des [1] = (unsigned char)((a * 102 + 154 * b + 128) >> 8); + + c = src[2] ; + des [2] = (unsigned char)((b * 205 + c * 51 + 128) >> 8); + des [3] = (unsigned char)((b * 51 + c * 205 + 128) >> 8); + + a = src[3]; + des [4] = (unsigned char)((c * 154 + a * 102 + 128) >> 8); + + src += 3; + des += 5; + } + + a = src[0]; + b = src[1]; + des [0] = (unsigned char)(a); + + des [1] = (unsigned char)((a * 102 + 154 * b + 128) >> 8); + c = src[2] ; + des [2] = (unsigned char)((b * 205 + c * 51 + 128) >> 8); + des [3] = (unsigned char)((b * 51 + c * 205 + 128) >> 8); + + des [4] = (unsigned char)(c); +} + +/**************************************************************************** + * + * ROUTINE : vp8cx_vertical_band_3_5_scale_c + * + * INPUTS : unsigned char *dest : Pointer to destination data. + * unsigned int dest_pitch : Stride of destination data. + * unsigned int dest_width : Width of destination data. + * + * OUTPUTS : None. + * + * RETURNS : void + * + * FUNCTION : Scales vertical band of pixels by scale 3 to 5. The + * height of the band scaled is 3-pixels. + * + * SPECIAL NOTES : The routine uses the first line of the band below + * the current band. + * + ****************************************************************************/ +void vp8cx_vertical_band_3_5_scale_c(unsigned char *dest, unsigned int dest_pitch, unsigned int dest_width) +{ + unsigned int i; + unsigned int a, b, c; + unsigned char *des = dest; + + for (i = 0; i < dest_width; i++) + { + a = des [0]; + b = des [dest_pitch]; + des [dest_pitch] = (unsigned char)((a * 102 + 154 * b + 128) >> 8); + + c = des[dest_pitch*2]; + des [dest_pitch*2] = (unsigned char)((b * 205 + c * 51 + 128) >> 8); + des [dest_pitch*3] = (unsigned char)((b * 51 + c * 205 + 128) >> 8); + + // First line in next band... + a = des [dest_pitch * 5]; + des [dest_pitch * 4] = (unsigned char)((c * 154 + a * 102 + 128) >> 8); + + des++; + } +} + +/**************************************************************************** + * + * ROUTINE : vp8cx_last_vertical_band_3_5_scale_c + * + * INPUTS : unsigned char *dest : Pointer to destination data. + * unsigned int dest_pitch : Stride of destination data. + * unsigned int dest_width : Width of destination data. + * + * OUTPUTS : None. + * + * RETURNS : void + * + * FUNCTION : Scales last vertical band of pixels by scale 3 to 5. The + * height of the band scaled is 3-pixels. + * + * SPECIAL NOTES : The routine does not have available the first line of + * the band below the current band, since this is the + * last band. + * + ****************************************************************************/ +void vp8cx_last_vertical_band_3_5_scale_c(unsigned char *dest, unsigned int dest_pitch, unsigned int dest_width) +{ + unsigned int i; + unsigned int a, b, c; + unsigned char *des = dest; + + for (i = 0; i < dest_width; ++i) + { + a = des [0]; + b = des [dest_pitch]; + + des [ dest_pitch ] = (unsigned char)((a * 102 + 154 * b + 128) >> 8); + + c = des[dest_pitch*2]; + des [dest_pitch*2] = (unsigned char)((b * 205 + c * 51 + 128) >> 8); + des [dest_pitch*3] = (unsigned char)((b * 51 + c * 205 + 128) >> 8); + + // No other line for interplation of this line, so .. + des [ dest_pitch * 4 ] = (unsigned char)(c) ; + + des++; + } +} + +/**************************************************************************** + * + * ROUTINE : vp8cx_horizontal_line_3_4_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 destination (NOT USED). + * + * OUTPUTS : None. + * + * RETURNS : void + * + * FUNCTION : Copies horizontal line of pixels from source to + * destination scaling up by 3 to 4. + * + * SPECIAL NOTES : None. + * + * + ****************************************************************************/ +void vp8cx_horizontal_line_3_4_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; + unsigned char *des = dest; + const unsigned char *src = source; + + (void) dest_width; + + for (i = 0; i < source_width - 3; i += 3) + { + a = src[0]; + b = src[1]; + des [0] = (unsigned char)(a); + des [1] = (unsigned char)((a * 64 + b * 192 + 128) >> 8); + + c = src[2]; + des [2] = (unsigned char)((b + c + 1) >> 1); + + a = src[3]; + des [3] = (unsigned char)((c * 192 + a * 64 + 128) >> 8); + + src += 3; + des += 4; + } + + a = src[0]; + b = src[1]; + des [0] = (unsigned char)(a); + des [1] = (unsigned char)((a * 64 + b * 192 + 128) >> 8); + + c = src[2] ; + des [2] = (unsigned char)((b + c + 1) >> 1); + des [3] = (unsigned char)(c); +} + +/**************************************************************************** + * + * ROUTINE : vp8cx_vertical_band_3_4_scale_c + * + * INPUTS : unsigned char *dest : Pointer to destination data. + * unsigned int dest_pitch : Stride of destination data. + * unsigned int dest_width : Width of destination data. + * + * OUTPUTS : None. + * + * RETURNS : void + * + * FUNCTION : Scales vertical band of pixels by scale 3 to 4. The + * height of the band scaled is 3-pixels. + * + * SPECIAL NOTES : The routine uses the first line of the band below + * the current band. + * + ****************************************************************************/ +void vp8cx_vertical_band_3_4_scale_c(unsigned char *dest, unsigned int dest_pitch, unsigned int dest_width) +{ + unsigned int i; + unsigned int a, b, c; + unsigned char *des = dest; + + for (i = 0; i < dest_width; i++) + { + a = des [0]; + b = des [dest_pitch]; + des [dest_pitch] = (unsigned char)((a * 64 + b * 192 + 128) >> 8); + + c = des[dest_pitch*2]; + des [dest_pitch*2] = (unsigned char)((b + c + 1) >> 1); + + // First line in next band... + a = des [dest_pitch*4]; + des [dest_pitch*3] = (unsigned char)((c * 192 + a * 64 + 128) >> 8); + + des++; + } +} + +/**************************************************************************** + * + * ROUTINE : vp8cx_last_vertical_band_3_4_scale_c + * + * INPUTS : unsigned char *dest : Pointer to destination data. + * unsigned int dest_pitch : Stride of destination data. + * unsigned int dest_width : Width of destination data. + * + * OUTPUTS : None. + * + * RETURNS : void + * + * FUNCTION : Scales last vertical band of pixels by scale 3 to 4. The + * height of the band scaled is 3-pixels. + * + * SPECIAL NOTES : The routine does not have available the first line of + * the band below the current band, since this is the + * last band. + * + ****************************************************************************/ +void vp8cx_last_vertical_band_3_4_scale_c(unsigned char *dest, unsigned int dest_pitch, unsigned int dest_width) +{ + unsigned int i; + unsigned int a, b, c; + unsigned char *des = dest; + + for (i = 0; i < dest_width; ++i) + { + a = des [0]; + b = des [dest_pitch]; + + des [dest_pitch] = (unsigned char)((a * 64 + b * 192 + 128) >> 8); + + c = des[dest_pitch*2]; + des [dest_pitch*2] = (unsigned char)((b + c + 1) >> 1); + + // No other line for interplation of this line, so .. + des [dest_pitch*3] = (unsigned char)(c); + + des++; + } +} + +/**************************************************************************** + * + * ROUTINE : vp8cx_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 destination (NOT USED). + * + * OUTPUTS : None. + * + * RETURNS : void + * + * FUNCTION : Copies horizontal line of pixels from source to + * destination scaling up by 1 to 2. + * + * SPECIAL NOTES : None. + * + ****************************************************************************/ +void vp8cx_horizontal_line_1_2_scale_c +( + const unsigned char *source, + unsigned int source_width, + unsigned char *dest, + unsigned int dest_width +) +{ + unsigned int i; + unsigned int a, b; + unsigned char *des = dest; + const unsigned char *src = source; + + (void) dest_width; + + for (i = 0; i < source_width - 1; i += 1) + { + a = src[0]; + b = src[1]; + des [0] = (unsigned char)(a); + des [1] = (unsigned char)((a + b + 1) >> 1); + src += 1; + des += 2; + } + + a = src[0]; + des [0] = (unsigned char)(a); + des [1] = (unsigned char)(a); +} + +/**************************************************************************** + * + * ROUTINE : vp8cx_vertical_band_1_2_scale_c + * + * INPUTS : unsigned char *dest : Pointer to destination data. + * unsigned int dest_pitch : Stride of destination data. + * unsigned int dest_width : Width of destination data. + * + * OUTPUTS : None. + * + * RETURNS : void + * + * FUNCTION : Scales vertical band of pixels by scale 1 to 2. The + * height of the band scaled is 1-pixel. + * + * SPECIAL NOTES : The routine uses the first line of the band below + * the current band. + * + ****************************************************************************/ +void vp8cx_vertical_band_1_2_scale_c(unsigned char *dest, unsigned int dest_pitch, unsigned int dest_width) +{ + unsigned int i; + unsigned int a, b; + unsigned char *des = dest; + + for (i = 0; i < dest_width; i++) + { + a = des [0]; + b = des [dest_pitch * 2]; + + des[dest_pitch] = (unsigned char)((a + b + 1) >> 1); + + des++; + } +} + +/**************************************************************************** + * + * ROUTINE : vp8cx_last_vertical_band_1_2_scale_c + * + * INPUTS : unsigned char *dest : Pointer to destination data. + * unsigned int dest_pitch : Stride of destination data. + * unsigned int dest_width : Width of destination data. + * + * OUTPUTS : None. + * + * RETURNS : void + * + * FUNCTION : Scales last vertical band of pixels by scale 1 to 2. The + * height of the band scaled is 1-pixel. + * + * SPECIAL NOTES : The routine does not have available the first line of + * the band below the current band, since this is the + * last band. + * + ****************************************************************************/ +void vp8cx_last_vertical_band_1_2_scale_c(unsigned char *dest, unsigned int dest_pitch, unsigned int dest_width) +{ + unsigned int i; + unsigned char *des = dest; + + for (i = 0; i < dest_width; ++i) + { + des[dest_pitch] = des[0]; + des++; + } +} + + + + + +/**************************************************************************** + * + * ROUTINE : vp8cx_horizontal_line_4_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 destination (NOT USED). + * + * OUTPUTS : None. + * + * RETURNS : void + * + * FUNCTION : Copies horizontal line of pixels from source to + * destination scaling up by 4 to 5. + * + * SPECIAL NOTES : None. + * + ****************************************************************************/ +void vp8cx_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 vp8cx_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 : vp8cx_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 destination (NOT USED). + * + * OUTPUTS : None. + * + * RETURNS : void + * + * FUNCTION : Copies horizontal line of pixels from source to + * destination scaling up by 3 to 5. + * + * SPECIAL NOTES : None. + * + * + ****************************************************************************/ +void vp8cx_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 vp8cx_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 : vp8cx_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 destination (NOT USED). + * + * OUTPUTS : None. + * + * RETURNS : void + * + * FUNCTION : Copies horizontal line of pixels from source to + * destination scaling up by 1 to 2. + * + * SPECIAL NOTES : None. + * + ****************************************************************************/ +void vp8cx_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 vp8cx_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; + vpx_memcpy(dest, source, dest_width); +} + +void vp8cx_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) +{ + unsigned int i; + int temp; + + (void) dest_pitch; + + for (i = 0; i < dest_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); + } + +} |