| /* |
| * 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. |
| */ |
| |
| |
| /**************************************************************************** |
| * |
| * Module Title : scale.c |
| * |
| * Description : Image scaling functions. |
| * |
| ***************************************************************************/ |
| |
| /**************************************************************************** |
| * Header Files |
| ****************************************************************************/ |
| #include "vpx_mem/vpx_mem.h" |
| #include "vpx_scale/yv12config.h" |
| #include "vpx_scale/scale_mode.h" |
| |
| /**************************************************************************** |
| * Exports |
| ****************************************************************************/ |
| #ifndef VPX_NO_GLOBALS |
| void (*vp8_vertical_band_4_5_scale)(unsigned char *dest, unsigned int dest_pitch, unsigned int dest_width) = 0; |
| void (*vp8_last_vertical_band_4_5_scale)(unsigned char *dest, unsigned int dest_pitch, unsigned int dest_width) = 0; |
| void (*vp8_vertical_band_2_3_scale)(unsigned char *dest, unsigned int dest_pitch, unsigned int dest_width) = 0; |
| void (*vp8_last_vertical_band_2_3_scale)(unsigned char *dest, unsigned int dest_pitch, unsigned int dest_width) = 0; |
| void (*vp8_vertical_band_3_5_scale)(unsigned char *dest, unsigned int dest_pitch, unsigned int dest_width) = 0; |
| void (*vp8_last_vertical_band_3_5_scale)(unsigned char *dest, unsigned int dest_pitch, unsigned int dest_width) = 0; |
| void (*vp8_vertical_band_3_4_scale)(unsigned char *dest, unsigned int dest_pitch, unsigned int dest_width) = 0; |
| void (*vp8_last_vertical_band_3_4_scale)(unsigned char *dest, unsigned int dest_pitch, unsigned int dest_width) = 0; |
| void (*vp8_horizontal_line_1_2_scale)(const unsigned char *source, unsigned int source_width, unsigned char *dest, unsigned int dest_width) = 0; |
| void (*vp8_horizontal_line_3_5_scale)(const unsigned char *source, unsigned int source_width, unsigned char *dest, unsigned int dest_width) = 0; |
| void (*vp8_horizontal_line_3_4_scale)(const unsigned char *source, unsigned int source_width, unsigned char *dest, unsigned int dest_width) = 0; |
| void (*vp8_horizontal_line_2_3_scale)(const unsigned char *source, unsigned int source_width, unsigned char *dest, unsigned int dest_width) = 0; |
| void (*vp8_horizontal_line_4_5_scale)(const unsigned char *source, unsigned int source_width, unsigned char *dest, unsigned int dest_width) = 0; |
| void (*vp8_vertical_band_1_2_scale)(unsigned char *dest, unsigned int dest_pitch, unsigned int dest_width) = 0; |
| void (*vp8_last_vertical_band_1_2_scale)(unsigned char *dest, unsigned int dest_pitch, unsigned int dest_width) = 0; |
| |
| void (*vp8_vertical_band_5_4_scale)(unsigned char *source, unsigned int src_pitch, unsigned char *dest, unsigned int dest_pitch, unsigned int dest_width) = 0; |
| void (*vp8_vertical_band_5_3_scale)(unsigned char *source, unsigned int src_pitch, unsigned char *dest, unsigned int dest_pitch, unsigned int dest_width) = 0; |
| void (*vp8_vertical_band_2_1_scale)(unsigned char *source, unsigned int src_pitch, unsigned char *dest, unsigned int dest_pitch, unsigned int dest_width) = 0; |
| void (*vp8_vertical_band_2_1_scale_i)(unsigned char *source, unsigned int src_pitch, unsigned char *dest, unsigned int dest_pitch, unsigned int dest_width) = 0; |
| void (*vp8_horizontal_line_2_1_scale)(const unsigned char *source, unsigned int source_width, unsigned char *dest, unsigned int dest_width) = 0; |
| void (*vp8_horizontal_line_5_3_scale)(const unsigned char *source, unsigned int source_width, unsigned char *dest, unsigned int dest_width) = 0; |
| void (*vp8_horizontal_line_5_4_scale)(const unsigned char *source, unsigned int source_width, unsigned char *dest, unsigned int dest_width) = 0; |
| #else |
| # include "vpxscale_nofp.h" |
| #endif |
| |
| typedef struct |
| { |
| int expanded_frame_width; |
| int expanded_frame_height; |
| |
| int HScale; |
| int HRatio; |
| int VScale; |
| int VRatio; |
| |
| YV12_BUFFER_CONFIG *src_yuv_config; |
| YV12_BUFFER_CONFIG *dst_yuv_config; |
| |
| } SCALE_VARS; |
| |
| /**************************************************************************** |
| * |
| * ROUTINE : horizontal_line_copy |
| * |
| * INPUTS : None |
| * |
| * |
| * OUTPUTS : None. |
| * |
| * RETURNS : None |
| * |
| * FUNCTION : 1 to 1 scaling up for a horizontal line of pixles |
| * |
| * SPECIAL NOTES : None. |
| * |
| * ERRORS : None. |
| * |
| ****************************************************************************/ |
| static |
| void horizontal_line_copy( |
| const unsigned char *source, |
| unsigned int source_width, |
| unsigned char *dest, |
| unsigned int dest_width |
| ) |
| { |
| (void) dest_width; |
| |
| duck_memcpy(dest, source, source_width); |
| } |
| /**************************************************************************** |
| * |
| * ROUTINE : null_scale |
| * |
| * INPUTS : None |
| * |
| * |
| * OUTPUTS : None. |
| * |
| * RETURNS : None |
| * |
| * FUNCTION : 1 to 1 scaling up for a vertical band |
| * |
| * SPECIAL NOTES : None. |
| * |
| * ERRORS : None. |
| * |
| ****************************************************************************/ |
| static |
| void null_scale( |
| unsigned char *dest, |
| unsigned int dest_pitch, |
| unsigned int dest_width |
| ) |
| { |
| (void) dest; |
| (void) dest_pitch; |
| (void) dest_width; |
| |
| return; |
| } |
| |
| /**************************************************************************** |
| * |
| * ROUTINE : scale1d_2t1_i |
| * |
| * INPUTS : const unsigned char *source : Pointer to data to be scaled. |
| * int source_step : Number of pixels to step on in source. |
| * unsigned int source_scale : Scale for source (UNUSED). |
| * unsigned int source_length : Length of source (UNUSED). |
| * unsigned char *dest : Pointer to output data array. |
| * int dest_step : Number of pixels to step on in destination. |
| * unsigned int dest_scale : Scale for destination (UNUSED). |
| * unsigned int dest_length : Length of destination. |
| * |
| * OUTPUTS : None. |
| * |
| * RETURNS : void |
| * |
| * FUNCTION : Performs 2-to-1 interpolated scaling. |
| * |
| * SPECIAL NOTES : None. |
| * |
| ****************************************************************************/ |
| static |
| void scale1d_2t1_i |
| ( |
| const unsigned char *source, |
| int source_step, |
| unsigned int source_scale, |
| unsigned int source_length, |
| unsigned char *dest, |
| int dest_step, |
| unsigned int dest_scale, |
| unsigned int dest_length |
| ) |
| { |
| unsigned int i, j; |
| unsigned int temp; |
| int source_pitch = source_step; |
| (void) source_length; |
| (void) source_scale; |
| (void) dest_scale; |
| |
| source_step *= 2; |
| dest[0] = source[0]; |
| |
| for (i = dest_step, j = source_step; i < dest_length * dest_step; i += dest_step, j += source_step) |
| { |
| temp = 8; |
| temp += 3 * source[j-source_pitch]; |
| temp += 10 * source[j]; |
| temp += 3 * source[j+source_pitch]; |
| temp >>= 4; |
| dest[i] = (char)(temp); |
| } |
| } |
| |
| /**************************************************************************** |
| * |
| * ROUTINE : scale1d_2t1_ps |
| * |
| * INPUTS : const unsigned char *source : Pointer to data to be scaled. |
| * int source_step : Number of pixels to step on in source. |
| * unsigned int source_scale : Scale for source (UNUSED). |
| * unsigned int source_length : Length of source (UNUSED). |
| * unsigned char *dest : Pointer to output data array. |
| * int dest_step : Number of pixels to step on in destination. |
| * unsigned int dest_scale : Scale for destination (UNUSED). |
| * unsigned int dest_length : Length of destination. |
| * |
| * OUTPUTS : None. |
| * |
| * RETURNS : void |
| * |
| * FUNCTION : Performs 2-to-1 point subsampled scaling. |
| * |
| * SPECIAL NOTES : None. |
| * |
| ****************************************************************************/ |
| static |
| void scale1d_2t1_ps |
| ( |
| const unsigned char *source, |
| int source_step, |
| unsigned int source_scale, |
| unsigned int source_length, |
| unsigned char *dest, |
| int dest_step, |
| unsigned int dest_scale, |
| unsigned int dest_length |
| ) |
| { |
| unsigned int i, j; |
| |
| (void) source_length; |
| (void) source_scale; |
| (void) dest_scale; |
| |
| source_step *= 2; |
| j = 0; |
| |
| for (i = 0; i < dest_length * dest_step; i += dest_step, j += source_step) |
| dest[i] = source[j]; |
| } |
| /**************************************************************************** |
| * |
| * ROUTINE : scale1d_c |
| * |
| * INPUTS : const unsigned char *source : Pointer to data to be scaled. |
| * int source_step : Number of pixels to step on in source. |
| * unsigned int source_scale : Scale for source. |
| * unsigned int source_length : Length of source (UNUSED). |
| * unsigned char *dest : Pointer to output data array. |
| * int dest_step : Number of pixels to step on in destination. |
| * unsigned int dest_scale : Scale for destination. |
| * unsigned int dest_length : Length of destination. |
| * |
| * OUTPUTS : None. |
| * |
| * RETURNS : void |
| * |
| * FUNCTION : Performs linear interpolation in one dimension. |
| * |
| * SPECIAL NOTES : None. |
| * |
| ****************************************************************************/ |
| static |
| void scale1d_c |
| ( |
| const unsigned char *source, |
| int source_step, |
| unsigned int source_scale, |
| unsigned int source_length, |
| unsigned char *dest, |
| int dest_step, |
| unsigned int dest_scale, |
| unsigned int dest_length |
| ) |
| { |
| unsigned int i; |
| unsigned int round_value = dest_scale / 2; |
| unsigned int left_modifier = dest_scale; |
| unsigned int right_modifier = 0; |
| unsigned char left_pixel = *source; |
| unsigned char right_pixel = *(source + source_step); |
| |
| (void) source_length; |
| |
| // These asserts are needed if there are boundary issues... |
| //assert ( dest_scale > source_scale ); |
| //assert ( (source_length-1) * dest_scale >= (dest_length-1) * source_scale ); |
| |
| for (i = 0; i < dest_length * dest_step; i += dest_step) |
| { |
| dest[i] = (char)((left_modifier * left_pixel + right_modifier * right_pixel + round_value) / dest_scale); |
| |
| right_modifier += source_scale; |
| |
| while (right_modifier > dest_scale) |
| { |
| right_modifier -= dest_scale; |
| source += source_step; |
| left_pixel = *source; |
| right_pixel = *(source + source_step); |
| } |
| |
| left_modifier = dest_scale - right_modifier; |
| } |
| } |
| |
| /**************************************************************************** |
| * |
| * ROUTINE : Scale2D |
| * |
| * INPUTS : const unsigned char *source : Pointer to data to be scaled. |
| * int source_pitch : Stride of source image. |
| * unsigned int source_width : Width of input image. |
| * unsigned int source_height : Height of input image. |
| * unsigned char *dest : Pointer to output data array. |
| * int dest_pitch : Stride of destination image. |
| * unsigned int dest_width : Width of destination image. |
| * unsigned int dest_height : Height of destination image. |
| * unsigned char *temp_area : Pointer to temp work area. |
| * unsigned char temp_area_height : Height of temp work area. |
| * unsigned int hscale : Horizontal scale factor numerator. |
| * unsigned int hratio : Horizontal scale factor denominator. |
| * unsigned int vscale : Vertical scale factor numerator. |
| * unsigned int vratio : Vertical scale factor denominator. |
| * unsigned int interlaced : Interlace flag. |
| * |
| * OUTPUTS : None. |
| * |
| * RETURNS : void |
| * |
| * FUNCTION : Performs 2-tap linear interpolation in two dimensions. |
| * |
| * SPECIAL NOTES : Expansion is performed one band at a time to help with |
| * caching. |
| * |
| ****************************************************************************/ |
| static |
| void Scale2D |
| ( |
| //const |
| unsigned char *source, |
| int source_pitch, |
| unsigned int source_width, |
| unsigned int source_height, |
| unsigned char *dest, |
| int dest_pitch, |
| unsigned int dest_width, |
| unsigned int dest_height, |
| unsigned char *temp_area, |
| unsigned char temp_area_height, |
| unsigned int hscale, |
| unsigned int hratio, |
| unsigned int vscale, |
| unsigned int vratio, |
| unsigned int interlaced |
| ) |
| { |
| //unsigned |
| int i, j, k; |
| int bands; |
| int dest_band_height; |
| int source_band_height; |
| |
| typedef void (*Scale1D)(const unsigned char * source, int source_step, unsigned int source_scale, unsigned int source_length, |
| unsigned char * dest, int dest_step, unsigned int dest_scale, unsigned int dest_length); |
| |
| Scale1D Scale1Dv = scale1d_c; |
| Scale1D Scale1Dh = scale1d_c; |
| |
| void (*horiz_line_scale)(const unsigned char *, unsigned int, unsigned char *, unsigned int) = NULL; |
| void (*vert_band_scale)(unsigned char *, unsigned int, unsigned char *, unsigned int, unsigned int) = NULL; |
| |
| int ratio_scalable = 1; |
| int interpolation = 0; |
| |
| unsigned char *source_base; // = (unsigned char *) ((source_pitch >= 0) ? source : (source + ((source_height-1) * source_pitch))); |
| unsigned char *line_src; |
| |
| |
| source_base = (unsigned char *)source; |
| |
| if (source_pitch < 0) |
| { |
| int offset; |
| |
| offset = (source_height - 1); |
| offset *= source_pitch; |
| |
| source_base += offset; |
| } |
| |
| // find out the ratio for each direction |
| switch (hratio * 10 / hscale) |
| { |
| case 8: |
| // 4-5 Scale in Width direction |
| horiz_line_scale = vp8_horizontal_line_5_4_scale; |
| break; |
| case 6: |
| // 3-5 Scale in Width direction |
| horiz_line_scale = vp8_horizontal_line_5_3_scale; |
| break; |
| case 5: |
| // 1-2 Scale in Width direction |
| horiz_line_scale = vp8_horizontal_line_2_1_scale; |
| break; |
| default: |
| // The ratio is not acceptable now |
| // throw("The ratio is not acceptable for now!"); |
| ratio_scalable = 0; |
| break; |
| } |
| |
| switch (vratio * 10 / vscale) |
| { |
| case 8: |
| // 4-5 Scale in vertical direction |
| vert_band_scale = vp8_vertical_band_5_4_scale; |
| source_band_height = 5; |
| dest_band_height = 4; |
| break; |
| case 6: |
| // 3-5 Scale in vertical direction |
| vert_band_scale = vp8_vertical_band_5_3_scale; |
| source_band_height = 5; |
| dest_band_height = 3; |
| break; |
| case 5: |
| // 1-2 Scale in vertical direction |
| |
| if (interlaced) |
| { |
| //if the content is interlaced, point sampling is used |
| vert_band_scale = vp8_vertical_band_2_1_scale; |
| } |
| else |
| { |
| |
| interpolation = 1; |
| //if the content is progressive, interplo |
| vert_band_scale = vp8_vertical_band_2_1_scale_i; |
| |
| } |
| |
| source_band_height = 2; |
| dest_band_height = 1; |
| break; |
| default: |
| // The ratio is not acceptable now |
| // throw("The ratio is not acceptable for now!"); |
| ratio_scalable = 0; |
| break; |
| } |
| |
| if (ratio_scalable) |
| { |
| if (source_height == dest_height) |
| { |
| // for each band of the image |
| for (k = 0; k < (int)dest_height; k++) |
| { |
| horiz_line_scale(source, source_width, dest, dest_width); |
| source += source_pitch; |
| dest += dest_pitch; |
| } |
| |
| return; |
| } |
| |
| if (interpolation) |
| { |
| if (source < source_base) |
| source = source_base; |
| |
| horiz_line_scale(source, source_width, temp_area, dest_width); |
| } |
| |
| for (k = 0; k < (int)(dest_height + dest_band_height - 1) / dest_band_height; k++) |
| { |
| // scale one band horizontally |
| for (i = 0; i < source_band_height; i++) |
| { |
| // Trap case where we could read off the base of the source buffer |
| |
| line_src = (unsigned char *)source + i * source_pitch; |
| |
| if (line_src < source_base) |
| line_src = source_base; |
| |
| horiz_line_scale(line_src, source_width, |
| temp_area + (i + 1)*dest_pitch, dest_width); |
| } |
| |
| // Vertical scaling is in place |
| vert_band_scale(temp_area + dest_pitch, dest_pitch, dest, dest_pitch, dest_width); |
| |
| if (interpolation) |
| vpx_memcpy(temp_area, temp_area + source_band_height * dest_pitch, dest_width); |
| |
| // Next band... |
| source += (unsigned long) source_band_height * source_pitch; |
| dest += (unsigned long) dest_band_height * dest_pitch; |
| } |
| |
| return; |
| } |
| |
| if (hscale == 2 && hratio == 1) |
| Scale1Dh = scale1d_2t1_ps; |
| |
| if (vscale == 2 && vratio == 1) |
| { |
| if (interlaced) |
| Scale1Dv = scale1d_2t1_ps; |
| else |
| Scale1Dv = scale1d_2t1_i; |
| } |
| |
| if (source_height == dest_height) |
| { |
| // for each band of the image |
| for (k = 0; k < (int)dest_height; k++) |
| { |
| Scale1Dh(source, 1, hscale, source_width + 1, dest, 1, hratio, dest_width); |
| source += source_pitch; |
| dest += dest_pitch; |
| } |
| |
| return; |
| } |
| |
| if (dest_height > source_height) |
| { |
| dest_band_height = temp_area_height - 1; |
| source_band_height = dest_band_height * source_height / dest_height; |
| } |
| else |
| { |
| source_band_height = temp_area_height - 1; |
| dest_band_height = source_band_height * vratio / vscale; |
| } |
| |
| // first row needs to be done so that we can stay one row ahead for vertical zoom |
| Scale1Dh(source, 1, hscale, source_width + 1, temp_area, 1, hratio, dest_width); |
| |
| // for each band of the image |
| bands = (dest_height + dest_band_height - 1) / dest_band_height; |
| |
| for (k = 0; k < bands; k++) |
| { |
| // scale one band horizontally |
| for (i = 1; i < source_band_height + 1; i++) |
| { |
| if (k * source_band_height + i < (int) source_height) |
| { |
| Scale1Dh(source + i * source_pitch, 1, hscale, source_width + 1, |
| temp_area + i * dest_pitch, 1, hratio, dest_width); |
| } |
| else // Duplicate the last row |
| { |
| // copy temp_area row 0 over from last row in the past |
| duck_memcpy(temp_area + i * dest_pitch, temp_area + (i - 1)*dest_pitch, dest_pitch); |
| } |
| } |
| |
| // scale one band vertically |
| for (j = 0; j < (int)dest_width; j++) |
| { |
| Scale1Dv(&temp_area[j], dest_pitch, vscale, source_band_height + 1, |
| &dest[j], dest_pitch, vratio, dest_band_height); |
| } |
| |
| // copy temp_area row 0 over from last row in the past |
| duck_memcpy(temp_area, temp_area + source_band_height * dest_pitch, dest_pitch); |
| |
| // move to the next band |
| source += source_band_height * source_pitch; |
| dest += dest_band_height * dest_pitch; |
| } |
| } |
| |
| /**************************************************************************** |
| * |
| * ROUTINE : |
| * |
| * INPUTS : YV12_BUFFER_CONFIG *src : Pointer to frame to be scaled. |
| * YV12_BUFFER_CONFIG *dst : Pointer to buffer to hold scaled frame. |
| * unsigned char *temp_area : Pointer to temp work area. |
| * unsigned char temp_area_height : Height of temp work area. |
| * unsigned int hscale : Horizontal scale factor numerator. |
| * unsigned int hratio : Horizontal scale factor denominator. |
| * unsigned int vscale : Vertical scale factor numerator. |
| * unsigned int vratio : Vertical scale factor denominator. |
| * unsigned int interlaced : Interlace flag. |
| * |
| * OUTPUTS : None. |
| * |
| * RETURNS : void |
| * |
| * FUNCTION : Performs 2-tap linear interpolation in two dimensions. |
| * |
| * SPECIAL NOTES : Expansion is performed one band at a time to help with |
| * caching. |
| * |
| ****************************************************************************/ |
| void vp8_scale_frame |
| ( |
| YV12_BUFFER_CONFIG *src, |
| YV12_BUFFER_CONFIG *dst, |
| unsigned char *temp_area, |
| unsigned char temp_height, |
| unsigned int hscale, |
| unsigned int hratio, |
| unsigned int vscale, |
| unsigned int vratio, |
| unsigned int interlaced |
| ) |
| { |
| int i; |
| int dw = (hscale - 1 + src->y_width * hratio) / hscale; |
| int dh = (vscale - 1 + src->y_height * vratio) / vscale; |
| |
| // call our internal scaling routines!! |
| Scale2D((unsigned char *) src->y_buffer, src->y_stride, src->y_width, src->y_height, |
| (unsigned char *) dst->y_buffer, dst->y_stride, dw, dh, |
| temp_area, temp_height, hscale, hratio, vscale, vratio, interlaced); |
| |
| if (dw < (int)dst->y_width) |
| for (i = 0; i < dh; i++) |
| duck_memset(dst->y_buffer + i * dst->y_stride + dw - 1, dst->y_buffer[i*dst->y_stride+dw-2], dst->y_width - dw + 1); |
| |
| if (dh < (int)dst->y_height) |
| for (i = dh - 1; i < (int)dst->y_height; i++) |
| duck_memcpy(dst->y_buffer + i * dst->y_stride, dst->y_buffer + (dh - 2) * dst->y_stride, dst->y_width + 1); |
| |
| Scale2D((unsigned char *) src->u_buffer, src->uv_stride, src->uv_width, src->uv_height, |
| (unsigned char *) dst->u_buffer, dst->uv_stride, dw / 2, dh / 2, |
| temp_area, temp_height, hscale, hratio, vscale, vratio, interlaced); |
| |
| if (dw / 2 < (int)dst->uv_width) |
| for (i = 0; i < dst->uv_height; i++) |
| duck_memset(dst->u_buffer + i * dst->uv_stride + dw / 2 - 1, dst->u_buffer[i*dst->uv_stride+dw/2-2], dst->uv_width - dw / 2 + 1); |
| |
| if (dh / 2 < (int)dst->uv_height) |
| for (i = dh / 2 - 1; i < (int)dst->y_height / 2; i++) |
| duck_memcpy(dst->u_buffer + i * dst->uv_stride, dst->u_buffer + (dh / 2 - 2)*dst->uv_stride, dst->uv_width); |
| |
| Scale2D((unsigned char *) src->v_buffer, src->uv_stride, src->uv_width, src->uv_height, |
| (unsigned char *) dst->v_buffer, dst->uv_stride, dw / 2, dh / 2, |
| temp_area, temp_height, hscale, hratio, vscale, vratio, interlaced); |
| |
| if (dw / 2 < (int)dst->uv_width) |
| for (i = 0; i < dst->uv_height; i++) |
| duck_memset(dst->v_buffer + i * dst->uv_stride + dw / 2 - 1, dst->v_buffer[i*dst->uv_stride+dw/2-2], dst->uv_width - dw / 2 + 1); |
| |
| if (dh / 2 < (int) dst->uv_height) |
| for (i = dh / 2 - 1; i < (int)dst->y_height / 2; i++) |
| duck_memcpy(dst->v_buffer + i * dst->uv_stride, dst->v_buffer + (dh / 2 - 2)*dst->uv_stride, dst->uv_width); |
| } |
| /**************************************************************************** |
| * |
| * ROUTINE : any_ratio_2d_scale |
| * |
| * INPUTS : SCALE_INSTANCE *si : Pointer to post-processor instance (NOT USED). |
| * const unsigned char *source : Pointer to source image. |
| * unsigned int source_pitch : Stride of source image. |
| * unsigned int source_width : Width of source image. |
| * unsigned int source_height : Height of source image (NOT USED). |
| * unsigned char *dest : Pointer to destination image. |
| * unsigned int dest_pitch : Stride of destination image. |
| * unsigned int dest_width : Width of destination image. |
| * unsigned int dest_height : Height of destination image. |
| * |
| * OUTPUTS : None. |
| * |
| * RETURNS : int: 1 if image scaled, 0 if image could not be scaled. |
| * |
| * FUNCTION : Scale the image with changing apect ratio. |
| * |
| * SPECIAL NOTES : This scaling is a bi-linear scaling. Need to re-work the |
| * whole function for new scaling algorithm. |
| * |
| ****************************************************************************/ |
| static |
| int any_ratio_2d_scale |
| ( |
| SCALE_VARS *si, |
| const unsigned char *source, |
| int source_pitch, |
| unsigned int source_width, |
| unsigned int source_height, |
| unsigned char *dest, |
| unsigned int dest_pitch, |
| unsigned int dest_width, |
| unsigned int dest_height |
| ) |
| { |
| unsigned int i, k; |
| unsigned int src_band_height = 0; |
| unsigned int dest_band_height = 0; |
| |
| // suggested scale factors |
| int hs = si->HScale; |
| int hr = si->HRatio; |
| int vs = si->VScale; |
| int vr = si->VRatio; |
| |
| // assume the ratios are scalable instead of should be centered |
| int ratio_scalable = 1; |
| |
| const unsigned char *source_base = ((source_pitch >= 0) ? source : (source + ((source_height - 1) * source_pitch))); |
| const unsigned char *line_src; |
| |
| void (*horiz_line_scale)(const unsigned char *, unsigned int, unsigned char *, unsigned int) = NULL; |
| void (*vert_band_scale)(unsigned char *, unsigned int, unsigned int) = NULL; |
| void (*last_vert_band_scale)(unsigned char *, unsigned int, unsigned int) = NULL; |
| |
| (void) si; |
| |
| // find out the ratio for each direction |
| switch (hr * 30 / hs) |
| { |
| case 24: |
| // 4-5 Scale in Width direction |
| horiz_line_scale = vp8_horizontal_line_4_5_scale; |
| break; |
| case 22: |
| // 3-4 Scale in Width direction |
| horiz_line_scale = vp8_horizontal_line_3_4_scale; |
| break; |
| |
| case 20: |
| // 4-5 Scale in Width direction |
| horiz_line_scale = vp8_horizontal_line_2_3_scale; |
| break; |
| case 18: |
| // 3-5 Scale in Width direction |
| horiz_line_scale = vp8_horizontal_line_3_5_scale; |
| break; |
| case 15: |
| // 1-2 Scale in Width direction |
| horiz_line_scale = vp8_horizontal_line_1_2_scale; |
| break; |
| case 30: |
| // no scale in Width direction |
| horiz_line_scale = horizontal_line_copy; |
| break; |
| default: |
| // The ratio is not acceptable now |
| // throw("The ratio is not acceptable for now!"); |
| ratio_scalable = 0; |
| break; |
| } |
| |
| switch (vr * 30 / vs) |
| { |
| case 24: |
| // 4-5 Scale in vertical direction |
| vert_band_scale = vp8_vertical_band_4_5_scale; |
| last_vert_band_scale = vp8_last_vertical_band_4_5_scale; |
| src_band_height = 4; |
| dest_band_height = 5; |
| break; |
| case 22: |
| // 3-4 Scale in vertical direction |
| vert_band_scale = vp8_vertical_band_3_4_scale; |
| last_vert_band_scale = vp8_last_vertical_band_3_4_scale; |
| src_band_height = 3; |
| dest_band_height = 4; |
| break; |
| case 20: |
| // 2-3 Scale in vertical direction |
| vert_band_scale = vp8_vertical_band_2_3_scale; |
| last_vert_band_scale = vp8_last_vertical_band_2_3_scale; |
| src_band_height = 2; |
| dest_band_height = 3; |
| break; |
| case 18: |
| // 3-5 Scale in vertical direction |
| vert_band_scale = vp8_vertical_band_3_5_scale; |
| last_vert_band_scale = vp8_last_vertical_band_3_5_scale; |
| src_band_height = 3; |
| dest_band_height = 5; |
| break; |
| case 15: |
| // 1-2 Scale in vertical direction |
| vert_band_scale = vp8_vertical_band_1_2_scale; |
| last_vert_band_scale = vp8_last_vertical_band_1_2_scale; |
| src_band_height = 1; |
| dest_band_height = 2; |
| break; |
| case 30: |
| // no scale in Width direction |
| vert_band_scale = null_scale; |
| last_vert_band_scale = null_scale; |
| src_band_height = 4; |
| dest_band_height = 4; |
| break; |
| default: |
| // The ratio is not acceptable now |
| // throw("The ratio is not acceptable for now!"); |
| ratio_scalable = 0; |
| break; |
| } |
| |
| if (ratio_scalable == 0) |
| return ratio_scalable; |
| |
| horiz_line_scale(source, source_width, dest, dest_width); |
| |
| // except last band |
| for (k = 0; k < (dest_height + dest_band_height - 1) / dest_band_height - 1; k++) |
| { |
| // scale one band horizontally |
| for (i = 1; i < src_band_height; i++) |
| { |
| // Trap case where we could read off the base of the source buffer |
| line_src = source + i * source_pitch; |
| |
| if (line_src < source_base) |
| line_src = source_base; |
| |
| horiz_line_scale(line_src, source_width, |
| dest + i * dest_pitch, dest_width); |
| } |
| |
| // first line of next band |
| // Trap case where we could read off the base of the source buffer |
| line_src = source + src_band_height * source_pitch; |
| |
| if (line_src < source_base) |
| line_src = source_base; |
| |
| horiz_line_scale(line_src, source_width, |
| dest + dest_band_height * dest_pitch, |
| dest_width); |
| |
| // Vertical scaling is in place |
| vert_band_scale(dest, dest_pitch, dest_width); |
| |
| // Next band... |
| source += src_band_height * source_pitch; |
| dest += dest_band_height * dest_pitch; |
| } |
| |
| // scale one band horizontally |
| for (i = 1; i < src_band_height; i++) |
| { |
| // Trap case where we could read off the base of the source buffer |
| line_src = source + i * source_pitch; |
| |
| if (line_src < source_base) |
| line_src = source_base; |
| |
| horiz_line_scale(line_src, source_width, |
| dest + i * dest_pitch, |
| dest_width); |
| } |
| |
| // Vertical scaling is in place |
| last_vert_band_scale(dest, dest_pitch, dest_width); |
| |
| return ratio_scalable; |
| } |
| |
| /**************************************************************************** |
| * |
| * ROUTINE : any_ratio_frame_scale |
| * |
| * INPUTS : SCALE_INSTANCE *si : Pointer to post-processor instance (NOT USED). |
| * unsigned char *frame_buffer : Pointer to source image. |
| * int YOffset : Offset from start of buffer to Y samples. |
| * int UVOffset : Offset from start of buffer to UV samples. |
| * |
| * OUTPUTS : None. |
| * |
| * RETURNS : int: 1 if image scaled, 0 if image could not be scaled. |
| * |
| * FUNCTION : Scale the image with changing apect ratio. |
| * |
| * SPECIAL NOTES : None. |
| * |
| ****************************************************************************/ |
| static |
| int any_ratio_frame_scale(SCALE_VARS *scale_vars, int YOffset, int UVOffset) |
| { |
| int i; |
| int ew; |
| int eh; |
| |
| // suggested scale factors |
| int hs = scale_vars->HScale; |
| int hr = scale_vars->HRatio; |
| int vs = scale_vars->VScale; |
| int vr = scale_vars->VRatio; |
| |
| int ratio_scalable = 1; |
| |
| int sw = (scale_vars->expanded_frame_width * hr + hs - 1) / hs; |
| int sh = (scale_vars->expanded_frame_height * vr + vs - 1) / vs; |
| int dw = scale_vars->expanded_frame_width; |
| int dh = scale_vars->expanded_frame_height; |
| YV12_BUFFER_CONFIG *src_yuv_config = scale_vars->src_yuv_config; |
| YV12_BUFFER_CONFIG *dst_yuv_config = scale_vars->dst_yuv_config; |
| |
| if (hr == 3) |
| ew = (sw + 2) / 3 * 3 * hs / hr; |
| else |
| ew = (sw + 7) / 8 * 8 * hs / hr; |
| |
| if (vr == 3) |
| eh = (sh + 2) / 3 * 3 * vs / vr; |
| else |
| eh = (sh + 7) / 8 * 8 * vs / vr; |
| |
| ratio_scalable = any_ratio_2d_scale(scale_vars, |
| (const unsigned char *)src_yuv_config->y_buffer, |
| src_yuv_config->y_stride, sw, sh, |
| (unsigned char *) dst_yuv_config->y_buffer + YOffset, |
| dst_yuv_config->y_stride, dw, dh); |
| |
| for (i = 0; i < eh; i++) |
| duck_memset(dst_yuv_config->y_buffer + YOffset + i * dst_yuv_config->y_stride + dw, 0, ew - dw); |
| |
| for (i = dh; i < eh; i++) |
| duck_memset(dst_yuv_config->y_buffer + YOffset + i * dst_yuv_config->y_stride, 0, ew); |
| |
| if (ratio_scalable == 0) |
| return ratio_scalable; |
| |
| sw = (sw + 1) >> 1; |
| sh = (sh + 1) >> 1; |
| dw = (dw + 1) >> 1; |
| dh = (dh + 1) >> 1; |
| |
| any_ratio_2d_scale(scale_vars, |
| (const unsigned char *)src_yuv_config->u_buffer, |
| src_yuv_config->y_stride / 2, sw, sh, |
| (unsigned char *)dst_yuv_config->u_buffer + UVOffset, |
| dst_yuv_config->uv_stride, dw, dh); |
| |
| any_ratio_2d_scale(scale_vars, |
| (const unsigned char *)src_yuv_config->v_buffer, |
| src_yuv_config->y_stride / 2, sw, sh, |
| (unsigned char *)dst_yuv_config->v_buffer + UVOffset, |
| dst_yuv_config->uv_stride, dw, dh); |
| |
| return ratio_scalable; |
| } |
| |
| /**************************************************************************** |
| * |
| * ROUTINE : center_image |
| * |
| * INPUTS : SCALE_INSTANCE *si : Pointer to post-processor instance. |
| * |
| * OUTPUTS : None. |
| * |
| * RETURNS : void |
| * |
| * FUNCTION : Centers the image without scaling in the output buffer. |
| * |
| * SPECIAL NOTES : None. |
| * |
| ****************************************************************************/ |
| static void |
| center_image(YV12_BUFFER_CONFIG *src_yuv_config, YV12_BUFFER_CONFIG *dst_yuv_config) |
| { |
| int i; |
| int row_offset, col_offset; |
| unsigned char *src_data_pointer; |
| unsigned char *dst_data_pointer; |
| |
| // center values |
| row_offset = (dst_yuv_config->y_height - src_yuv_config->y_height) / 2; |
| col_offset = (dst_yuv_config->y_width - src_yuv_config->y_width) / 2; |
| |
| // Y's |
| src_data_pointer = src_yuv_config->y_buffer; |
| dst_data_pointer = (unsigned char *)dst_yuv_config->y_buffer + (row_offset * dst_yuv_config->y_stride) + col_offset; |
| |
| for (i = 0; i < src_yuv_config->y_height; i++) |
| { |
| duck_memcpy(dst_data_pointer, src_data_pointer, src_yuv_config->y_width); |
| dst_data_pointer += dst_yuv_config->y_stride; |
| src_data_pointer += src_yuv_config->y_stride; |
| } |
| |
| row_offset /= 2; |
| col_offset /= 2; |
| |
| // U's |
| src_data_pointer = src_yuv_config->u_buffer; |
| dst_data_pointer = (unsigned char *)dst_yuv_config->u_buffer + (row_offset * dst_yuv_config->uv_stride) + col_offset; |
| |
| for (i = 0; i < src_yuv_config->uv_height; i++) |
| { |
| duck_memcpy(dst_data_pointer, src_data_pointer, src_yuv_config->uv_width); |
| dst_data_pointer += dst_yuv_config->uv_stride; |
| src_data_pointer += src_yuv_config->uv_stride; |
| } |
| |
| // V's |
| src_data_pointer = src_yuv_config->v_buffer; |
| dst_data_pointer = (unsigned char *)dst_yuv_config->v_buffer + (row_offset * dst_yuv_config->uv_stride) + col_offset; |
| |
| for (i = 0; i < src_yuv_config->uv_height; i++) |
| { |
| duck_memcpy(dst_data_pointer, src_data_pointer, src_yuv_config->uv_width); |
| dst_data_pointer += dst_yuv_config->uv_stride; |
| src_data_pointer += src_yuv_config->uv_stride; |
| } |
| } |
| |
| /**************************************************************************** |
| * |
| * ROUTINE : scale_or_center |
| * |
| * INPUTS : SCALE_INSTANCE *si : Pointer to post-processor instance. |
| * |
| * |
| * |
| * OUTPUTS : None. |
| * |
| * RETURNS : void |
| * |
| * FUNCTION : Decides to scale or center image in scale buffer for blit |
| * |
| * SPECIAL NOTES : None. |
| * |
| ****************************************************************************/ |
| void |
| vp8_yv12_scale_or_center |
| ( |
| YV12_BUFFER_CONFIG *src_yuv_config, |
| YV12_BUFFER_CONFIG *dst_yuv_config, |
| int expanded_frame_width, |
| int expanded_frame_height, |
| int scaling_mode, |
| int HScale, |
| int HRatio, |
| int VScale, |
| int VRatio |
| ) |
| { |
| // if ( ppi->post_processing_level ) |
| // update_umvborder ( ppi, frame_buffer ); |
| |
| |
| switch (scaling_mode) |
| { |
| case SCALE_TO_FIT: |
| case MAINTAIN_ASPECT_RATIO: |
| { |
| SCALE_VARS scale_vars; |
| // center values |
| #if 1 |
| int row = (dst_yuv_config->y_height - expanded_frame_height) / 2; |
| int col = (dst_yuv_config->y_width - expanded_frame_width) / 2; |
| // int YOffset = row * dst_yuv_config->y_width + col; |
| // int UVOffset = (row>>1) * dst_yuv_config->uv_width + (col>>1); |
| int YOffset = row * dst_yuv_config->y_stride + col; |
| int UVOffset = (row >> 1) * dst_yuv_config->uv_stride + (col >> 1); |
| #else |
| int row = (src_yuv_config->y_height - expanded_frame_height) / 2; |
| int col = (src_yuv_config->y_width - expanded_frame_width) / 2; |
| int YOffset = row * src_yuv_config->y_width + col; |
| int UVOffset = (row >> 1) * src_yuv_config->uv_width + (col >> 1); |
| #endif |
| |
| scale_vars.dst_yuv_config = dst_yuv_config; |
| scale_vars.src_yuv_config = src_yuv_config; |
| scale_vars.HScale = HScale; |
| scale_vars.HRatio = HRatio; |
| scale_vars.VScale = VScale; |
| scale_vars.VRatio = VRatio; |
| scale_vars.expanded_frame_width = expanded_frame_width; |
| scale_vars.expanded_frame_height = expanded_frame_height; |
| |
| // perform center and scale |
| any_ratio_frame_scale(&scale_vars, YOffset, UVOffset); |
| |
| break; |
| } |
| case CENTER: |
| center_image(src_yuv_config, dst_yuv_config); |
| break; |
| |
| default: |
| break; |
| } |
| } |
