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gecko/media/libvpx/vpx_scale/generic/vpxscale.c

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Bug 566247 - Add libvpx, VP8 decoding library for WebM. r=ted
2010-06-08 16:31:28 -07:00
/*
* 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 : 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;
}
}
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