| /* |
| * Copyright (c) 2010 The VP8 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. |
| */ |
| |
| |
| /**************************************************************************** |
| * |
| * Module Title : gen_scalers.c |
| * |
| * Description : Generic image scaling functions. |
| * |
| ***************************************************************************/ |
| |
| /**************************************************************************** |
| * Header Files |
| ****************************************************************************/ |
| #include "vpx_scale/vpxscale.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. |
| * |
| ****************************************************************************/ |
| static |
| 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. |
| * |
| ****************************************************************************/ |
| static |
| 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. |
| * |
| ****************************************************************************/ |
| static |
| 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_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. |
| * |
| * |
| ****************************************************************************/ |
| static |
| 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. |
| * |
| ****************************************************************************/ |
| static |
| 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. |
| * |
| ****************************************************************************/ |
| static |
| 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_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. |
| * |
| ****************************************************************************/ |
| static |
| 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. |
| * |
| ****************************************************************************/ |
| static |
| 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. |
| * |
| ****************************************************************************/ |
| static |
| 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++; |
| } |
| } |
| |
| #include "vpx_scale/vpxscale.h" |
| #include "vpx_mem/vpx_mem.h" |
| |
| struct vpxglobal_scalling_ptrs_t *g_scaling_ptrs = 0; |
| |
| int |
| register_generic_scalers(void) |
| { |
| int rv = 0; |
| |
| g_scaling_ptrs = (struct vpxglobal_scalling_ptrs_t *)vpx_malloc(sizeof(struct vpxglobal_scalling_ptrs_t)); |
| |
| if (g_scaling_ptrs) |
| { |
| g_scaling_ptrs->vpxhorizontal_line_1_2_scale_t = vp8cx_horizontal_line_1_2_scale_c; |
| g_scaling_ptrs->vpxvertical_band_1_2_scale_t = vp8cx_vertical_band_1_2_scale_c; |
| g_scaling_ptrs->vpxlast_vertical_band_1_2_scale_t = vp8cx_last_vertical_band_1_2_scale_c; |
| g_scaling_ptrs->vpxhorizontal_line_3_5_scale_t = vp8cx_horizontal_line_3_5_scale_c; |
| g_scaling_ptrs->vpxvertical_band_3_5_scale_t = vp8cx_vertical_band_3_5_scale_c; |
| g_scaling_ptrs->vpxlast_vertical_band_3_5_scale_t = vp8cx_last_vertical_band_3_5_scale_c; |
| g_scaling_ptrs->vpxhorizontal_line_4_5_scale_t = vp8cx_horizontal_line_4_5_scale_c; |
| g_scaling_ptrs->vpxvertical_band_4_5_scale_t = vp8cx_vertical_band_4_5_scale_c; |
| g_scaling_ptrs->vpxlast_vertical_band_4_5_scale_t = vp8cx_last_vertical_band_4_5_scale_c; |
| } |
| else |
| { |
| rv = -1; |
| } |
| |
| /* |
| vp8_horizontal_line_1_2_scale = vp8cx_horizontal_line_1_2_scale_c; |
| vp8_vertical_band_1_2_scale = vp8cx_vertical_band_1_2_scale_c; |
| vp8_last_vertical_band_1_2_scale = vp8cx_last_vertical_band_1_2_scale_c; |
| vp8_horizontal_line_3_5_scale = vp8cx_horizontal_line_3_5_scale_c; |
| vp8_vertical_band_3_5_scale = vp8cx_vertical_band_3_5_scale_c; |
| vp8_last_vertical_band_3_5_scale = vp8cx_last_vertical_band_3_5_scale_c; |
| vp8_horizontal_line_4_5_scale = vp8cx_horizontal_line_4_5_scale_c; |
| vp8_vertical_band_4_5_scale = vp8cx_vertical_band_4_5_scale_c; |
| vp8_last_vertical_band_4_5_scale = vp8cx_last_vertical_band_4_5_scale_c; |
| */ |
| |
| return rv; |
| } |
| |
| int |
| de_register_generic_scalers(void) |
| { |
| int rv = 0; |
| |
| if (g_scaling_ptrs) |
| { |
| vpx_free(g_scaling_ptrs); |
| g_scaling_ptrs = 0; |
| } |
| else |
| { |
| rv = -1; |
| } |
| |
| return rv; |
| } |