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25d874ec9b
Original commit message from CVS: * gst/videoscale/Makefile.am: * gst/videoscale/gstvideoscale.c: * gst/videoscale/gstvideoscale.h: * gst/videoscale/vs_4tap.c: * gst/videoscale/vs_4tap.h: * gst/videoscale/vs_image.c: * gst/videoscale/vs_image.h: * gst/videoscale/vs_scanline.c: * gst/videoscale/vs_scanline.h: Add a 4-tap image scaler. Theoretically looks much prettier. The tap calculation could use some improvement.
853 lines
22 KiB
C
853 lines
22 KiB
C
/*
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* Image Scaling Functions
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* Copyright (c) 2005 David A. Schleef <ds@schleef.org>
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
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* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT,
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* INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
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* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
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* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
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* STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
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* IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*/
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#include <string.h>
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#include "vs_scanline.h"
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#include "vs_image.h"
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#define ROUND_UP_2(x) (((x)+1)&~1)
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#define ROUND_UP_4(x) (((x)+3)&~3)
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#define ROUND_UP_8(x) (((x)+7)&~7)
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void
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vs_image_scale_nearest_RGBA (const VSImage * dest, const VSImage * src,
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uint8_t * tmpbuf)
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{
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int acc;
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int y_increment;
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int x_increment;
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int i;
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int j;
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int x;
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int xacc;
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y_increment = ((src->height - 1) << 16) / (dest->height - 1);
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x_increment = ((src->width - 1) << 16) / (dest->width - 1);
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acc = 0;
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for (i = 0; i < dest->height; i++) {
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j = acc >> 16;
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x = acc & 0xffff;
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xacc = 0;
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vs_scanline_resample_nearest_RGBA (dest->pixels + i * dest->stride,
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src->pixels + j * src->stride, dest->width, &xacc, x_increment);
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acc += y_increment;
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}
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}
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void
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vs_image_scale_linear_RGBA (const VSImage * dest, const VSImage * src,
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uint8_t * tmpbuf)
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{
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int acc;
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int y_increment;
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int x_increment;
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uint8_t *tmp1;
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uint8_t *tmp2;
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int y1;
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int y2;
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int i;
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int j;
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int x;
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int dest_size;
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int xacc;
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y_increment = ((src->height - 1) << 16) / (dest->height - 1);
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x_increment = ((src->width - 1) << 16) / (dest->width - 1);
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dest_size = dest->width * 4;
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tmp1 = tmpbuf;
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tmp2 = tmpbuf + dest_size;
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acc = 0;
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xacc = 0;
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y2 = -1;
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vs_scanline_resample_linear_RGBA (tmp1, src->pixels, dest->width, &xacc,
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x_increment);
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y1 = 0;
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for (i = 0; i < dest->height; i++) {
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j = acc >> 16;
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x = acc & 0xffff;
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if (x == 0) {
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if (j == y1) {
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memcpy (dest->pixels + i * dest->stride, tmp1, dest_size);
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} else if (j == y2) {
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memcpy (dest->pixels + i * dest->stride, tmp2, dest_size);
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} else {
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xacc = 0;
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vs_scanline_resample_linear_RGBA (tmp1, src->pixels + j * src->stride,
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dest->width, &xacc, x_increment);
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y1 = j;
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memcpy (dest->pixels + i * dest->stride, tmp1, dest_size);
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}
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} else {
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if (j == y1) {
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if (j + 1 != y2) {
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xacc = 0;
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vs_scanline_resample_linear_RGBA (tmp2,
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src->pixels + (j + 1) * src->stride, dest->width, &xacc,
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x_increment);
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y2 = j + 1;
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}
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vs_scanline_merge_linear_RGBA (dest->pixels + i * dest->stride,
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tmp1, tmp2, dest->width, x);
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} else if (j == y2) {
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if (j + 1 != y1) {
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xacc = 0;
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vs_scanline_resample_linear_RGBA (tmp1,
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src->pixels + (j + 1) * src->stride, dest->width, &xacc,
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x_increment);
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y1 = j + 1;
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}
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vs_scanline_merge_linear_RGBA (dest->pixels + i * dest->stride,
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tmp2, tmp1, dest->width, x);
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} else {
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xacc = 0;
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vs_scanline_resample_linear_RGBA (tmp1, src->pixels + j * src->stride,
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dest->width, &xacc, x_increment);
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y1 = j;
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xacc = 0;
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vs_scanline_resample_linear_RGBA (tmp2,
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src->pixels + (j + 1) * src->stride, dest->width, &xacc,
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x_increment);
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y2 = (j + 1);
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vs_scanline_merge_linear_RGBA (dest->pixels + i * dest->stride,
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tmp1, tmp2, dest->width, x);
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}
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}
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acc += y_increment;
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}
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}
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void
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vs_image_scale_nearest_RGB (const VSImage * dest, const VSImage * src,
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uint8_t * tmpbuf)
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{
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int acc;
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int y_increment;
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int x_increment;
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int i;
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int j;
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int x;
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int xacc;
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y_increment = ((src->height - 1) << 16) / (dest->height - 1);
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x_increment = ((src->width - 1) << 16) / (dest->width - 1);
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acc = 0;
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for (i = 0; i < dest->height; i++) {
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j = acc >> 16;
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x = acc & 0xffff;
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xacc = 0;
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vs_scanline_resample_nearest_RGB (dest->pixels + i * dest->stride,
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src->pixels + j * src->stride, dest->width, &xacc, x_increment);
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acc += y_increment;
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}
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}
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void
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vs_image_scale_linear_RGB (const VSImage * dest, const VSImage * src,
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uint8_t * tmpbuf)
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{
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int acc;
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int y_increment;
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int x_increment;
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uint8_t *tmp1;
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uint8_t *tmp2;
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int y1;
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int y2;
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int i;
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int j;
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int x;
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int dest_size;
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int xacc;
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y_increment = ((src->height - 1) << 16) / (dest->height - 1);
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x_increment = ((src->width - 1) << 16) / (dest->width - 1);
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dest_size = dest->width * 3;
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tmp1 = tmpbuf;
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tmp2 = tmpbuf + dest_size;
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acc = 0;
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xacc = 0;
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y2 = -1;
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vs_scanline_resample_linear_RGB (tmp1, src->pixels, dest->width, &xacc,
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x_increment);
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y1 = 0;
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for (i = 0; i < dest->height; i++) {
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j = acc >> 16;
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x = acc & 0xffff;
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if (x == 0) {
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if (j == y1) {
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memcpy (dest->pixels + i * dest->stride, tmp1, dest_size);
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} else if (j == y2) {
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memcpy (dest->pixels + i * dest->stride, tmp2, dest_size);
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} else {
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xacc = 0;
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vs_scanline_resample_linear_RGB (tmp1, src->pixels + j * src->stride,
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dest->width, &xacc, x_increment);
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y1 = j;
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memcpy (dest->pixels + i * dest->stride, tmp1, dest_size);
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}
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} else {
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if (j == y1) {
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if (j + 1 != y2) {
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xacc = 0;
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vs_scanline_resample_linear_RGB (tmp2,
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src->pixels + (j + 1) * src->stride, dest->width, &xacc,
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x_increment);
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y2 = j + 1;
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}
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vs_scanline_merge_linear_RGB (dest->pixels + i * dest->stride,
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tmp1, tmp2, dest->width, x);
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} else if (j == y2) {
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if (j + 1 != y1) {
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xacc = 0;
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vs_scanline_resample_linear_RGB (tmp1,
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src->pixels + (j + 1) * src->stride, dest->width, &xacc,
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x_increment);
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y1 = j + 1;
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}
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vs_scanline_merge_linear_RGB (dest->pixels + i * dest->stride,
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tmp2, tmp1, dest->width, x);
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} else {
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xacc = 0;
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vs_scanline_resample_linear_RGB (tmp1, src->pixels + j * src->stride,
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dest->width, &xacc, x_increment);
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y1 = j;
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xacc = 0;
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vs_scanline_resample_linear_RGB (tmp2,
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src->pixels + (j + 1) * src->stride, dest->width, &xacc,
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x_increment);
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y2 = (j + 1);
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vs_scanline_merge_linear_RGB (dest->pixels + i * dest->stride,
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tmp1, tmp2, dest->width, x);
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}
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}
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acc += y_increment;
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}
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}
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/* YUYV */
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void
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vs_image_scale_nearest_YUYV (const VSImage * dest, const VSImage * src,
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uint8_t * tmpbuf)
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{
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int acc;
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int y_increment;
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int x_increment;
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int i;
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int j;
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int x;
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int xacc;
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int n_quads;
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y_increment = ((src->height - 1) << 16) / (dest->height - 1);
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x_increment = ((src->width - 1) << 16) / (dest->width - 1);
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n_quads = ROUND_UP_2 (dest->width) / 2;
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acc = 0;
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for (i = 0; i < dest->height; i++) {
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j = acc >> 16;
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x = acc & 0xffff;
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xacc = 0;
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vs_scanline_resample_nearest_YUYV (dest->pixels + i * dest->stride,
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src->pixels + j * src->stride, n_quads, &xacc, x_increment);
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acc += y_increment;
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}
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}
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void
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vs_image_scale_linear_YUYV (const VSImage * dest, const VSImage * src,
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uint8_t * tmpbuf)
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{
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int acc;
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int y_increment;
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int x_increment;
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uint8_t *tmp1;
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uint8_t *tmp2;
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int y1;
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int y2;
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int i;
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int j;
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int x;
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int dest_size;
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int n_quads;
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int xacc;
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y_increment = ((src->height - 1) << 16) / (dest->height - 1);
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x_increment = ((src->width - 1) << 16) / (dest->width - 1);
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dest_size = ROUND_UP_4 (dest->width * 2);
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n_quads = ROUND_UP_2 (dest->width) / 2;
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tmp1 = tmpbuf;
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tmp2 = tmpbuf + dest_size;
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acc = 0;
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xacc = 0;
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y2 = -1;
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vs_scanline_resample_linear_YUYV (tmp1, src->pixels, n_quads, &xacc,
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x_increment);
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y1 = 0;
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for (i = 0; i < dest->height; i++) {
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j = acc >> 16;
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x = acc & 0xffff;
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if (x == 0) {
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if (j == y1) {
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memcpy (dest->pixels + i * dest->stride, tmp1, dest_size);
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} else if (j == y2) {
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memcpy (dest->pixels + i * dest->stride, tmp2, dest_size);
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} else {
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xacc = 0;
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vs_scanline_resample_linear_YUYV (tmp1, src->pixels + j * src->stride,
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n_quads, &xacc, x_increment);
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y1 = j;
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memcpy (dest->pixels + i * dest->stride, tmp1, dest_size);
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}
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} else {
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if (j == y1) {
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if (j + 1 != y2) {
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xacc = 0;
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vs_scanline_resample_linear_YUYV (tmp2,
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src->pixels + (j + 1) * src->stride, n_quads, &xacc, x_increment);
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y2 = j + 1;
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}
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vs_scanline_merge_linear_YUYV (dest->pixels + i * dest->stride,
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tmp1, tmp2, n_quads, x);
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} else if (j == y2) {
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if (j + 1 != y1) {
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xacc = 0;
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vs_scanline_resample_linear_YUYV (tmp1,
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src->pixels + (j + 1) * src->stride, n_quads, &xacc, x_increment);
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y1 = j + 1;
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}
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vs_scanline_merge_linear_YUYV (dest->pixels + i * dest->stride,
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tmp2, tmp1, n_quads, x);
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} else {
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xacc = 0;
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vs_scanline_resample_linear_YUYV (tmp1, src->pixels + j * src->stride,
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n_quads, &xacc, x_increment);
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y1 = j;
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xacc = 0;
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vs_scanline_resample_linear_YUYV (tmp2,
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src->pixels + (j + 1) * src->stride, n_quads, &xacc, x_increment);
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y2 = (j + 1);
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vs_scanline_merge_linear_YUYV (dest->pixels + i * dest->stride,
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tmp1, tmp2, n_quads, x);
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}
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}
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acc += y_increment;
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}
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}
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/* UYVY */
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void
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vs_image_scale_nearest_UYVY (const VSImage * dest, const VSImage * src,
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uint8_t * tmpbuf)
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{
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int acc;
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int y_increment;
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int x_increment;
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int i;
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int j;
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int x;
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int xacc;
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int n_quads;
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y_increment = ((src->height - 1) << 16) / (dest->height - 1);
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x_increment = ((src->width - 1) << 16) / (dest->width - 1);
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n_quads = (dest->width + 1) / 2;
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acc = 0;
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for (i = 0; i < dest->height; i++) {
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j = acc >> 16;
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x = acc & 0xffff;
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xacc = 0;
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vs_scanline_resample_nearest_UYVY (dest->pixels + i * dest->stride,
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src->pixels + j * src->stride, n_quads, &xacc, x_increment);
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acc += y_increment;
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}
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}
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void
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vs_image_scale_linear_UYVY (const VSImage * dest, const VSImage * src,
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uint8_t * tmpbuf)
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{
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int acc;
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int y_increment;
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int x_increment;
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uint8_t *tmp1;
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uint8_t *tmp2;
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int y1;
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int y2;
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int i;
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int j;
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int x;
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int dest_size;
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int n_quads;
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int xacc;
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y_increment = ((src->height - 1) << 16) / (dest->height - 1);
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x_increment = ((src->width - 1) << 16) / (dest->width - 1);
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dest_size = ROUND_UP_4 (dest->width * 2);
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n_quads = ROUND_UP_2 (dest->width) / 2;
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tmp1 = tmpbuf;
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tmp2 = tmpbuf + dest_size;
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acc = 0;
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xacc = 0;
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y2 = -1;
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vs_scanline_resample_linear_UYVY (tmp1, src->pixels, n_quads, &xacc,
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x_increment);
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y1 = 0;
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for (i = 0; i < dest->height; i++) {
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j = acc >> 16;
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x = acc & 0xffff;
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if (x == 0) {
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if (j == y1) {
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memcpy (dest->pixels + i * dest->stride, tmp1, dest_size);
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} else if (j == y2) {
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memcpy (dest->pixels + i * dest->stride, tmp2, dest_size);
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} else {
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xacc = 0;
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vs_scanline_resample_linear_UYVY (tmp1, src->pixels + j * src->stride,
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n_quads, &xacc, x_increment);
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y1 = j;
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memcpy (dest->pixels + i * dest->stride, tmp1, dest_size);
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}
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} else {
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if (j == y1) {
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if (j + 1 != y2) {
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xacc = 0;
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vs_scanline_resample_linear_UYVY (tmp2,
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src->pixels + (j + 1) * src->stride, n_quads, &xacc, x_increment);
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y2 = j + 1;
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}
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vs_scanline_merge_linear_UYVY (dest->pixels + i * dest->stride,
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tmp1, tmp2, n_quads, x);
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} else if (j == y2) {
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if (j + 1 != y1) {
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xacc = 0;
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vs_scanline_resample_linear_UYVY (tmp1,
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src->pixels + (j + 1) * src->stride, n_quads, &xacc, x_increment);
|
|
y1 = j + 1;
|
|
}
|
|
vs_scanline_merge_linear_UYVY (dest->pixels + i * dest->stride,
|
|
tmp2, tmp1, n_quads, x);
|
|
} else {
|
|
xacc = 0;
|
|
vs_scanline_resample_linear_UYVY (tmp1, src->pixels + j * src->stride,
|
|
n_quads, &xacc, x_increment);
|
|
y1 = j;
|
|
xacc = 0;
|
|
vs_scanline_resample_linear_UYVY (tmp2,
|
|
src->pixels + (j + 1) * src->stride, n_quads, &xacc, x_increment);
|
|
y2 = (j + 1);
|
|
vs_scanline_merge_linear_UYVY (dest->pixels + i * dest->stride,
|
|
tmp1, tmp2, n_quads, x);
|
|
}
|
|
}
|
|
|
|
acc += y_increment;
|
|
}
|
|
}
|
|
|
|
/* greyscale */
|
|
|
|
void
|
|
vs_image_scale_nearest_Y (const VSImage * dest, const VSImage * src,
|
|
uint8_t * tmpbuf)
|
|
{
|
|
int acc;
|
|
int y_increment;
|
|
int x_increment;
|
|
int i;
|
|
int j;
|
|
int x;
|
|
int xacc;
|
|
|
|
y_increment = ((src->height - 1) << 16) / (dest->height - 1);
|
|
x_increment = ((src->width - 1) << 16) / (dest->width - 1);
|
|
|
|
acc = 0;
|
|
for (i = 0; i < dest->height; i++) {
|
|
j = acc >> 16;
|
|
x = acc & 0xffff;
|
|
|
|
xacc = 0;
|
|
vs_scanline_resample_nearest_Y (dest->pixels + i * dest->stride,
|
|
src->pixels + j * src->stride, dest->width, &xacc, x_increment);
|
|
|
|
acc += y_increment;
|
|
}
|
|
}
|
|
|
|
void
|
|
vs_image_scale_linear_Y (const VSImage * dest, const VSImage * src,
|
|
uint8_t * tmpbuf)
|
|
{
|
|
int acc;
|
|
int y_increment;
|
|
int x_increment;
|
|
uint8_t *tmp1;
|
|
uint8_t *tmp2;
|
|
int y1;
|
|
int y2;
|
|
int i;
|
|
int j;
|
|
int x;
|
|
int dest_size;
|
|
int xacc;
|
|
|
|
y_increment = ((src->height - 1) << 16) / (dest->height - 1);
|
|
x_increment = ((src->width - 1) << 16) / (dest->width - 1);
|
|
|
|
dest_size = dest->width;
|
|
|
|
tmp1 = tmpbuf;
|
|
tmp2 = tmpbuf + dest_size;
|
|
|
|
acc = 0;
|
|
xacc = 0;
|
|
y2 = -1;
|
|
vs_scanline_resample_linear_Y (tmp1, src->pixels, dest->width, &xacc,
|
|
x_increment);
|
|
y1 = 0;
|
|
for (i = 0; i < dest->height; i++) {
|
|
j = acc >> 16;
|
|
x = acc & 0xffff;
|
|
|
|
if (x == 0) {
|
|
if (j == y1) {
|
|
memcpy (dest->pixels + i * dest->stride, tmp1, dest_size);
|
|
} else if (j == y2) {
|
|
memcpy (dest->pixels + i * dest->stride, tmp2, dest_size);
|
|
} else {
|
|
xacc = 0;
|
|
vs_scanline_resample_linear_Y (tmp1, src->pixels + j * src->stride,
|
|
dest->width, &xacc, x_increment);
|
|
y1 = j;
|
|
memcpy (dest->pixels + i * dest->stride, tmp1, dest_size);
|
|
}
|
|
} else {
|
|
if (j == y1) {
|
|
if (j + 1 != y2) {
|
|
xacc = 0;
|
|
vs_scanline_resample_linear_Y (tmp2,
|
|
src->pixels + (j + 1) * src->stride, dest->width, &xacc,
|
|
x_increment);
|
|
y2 = j + 1;
|
|
}
|
|
vs_scanline_merge_linear_Y (dest->pixels + i * dest->stride,
|
|
tmp1, tmp2, dest->width, x);
|
|
} else if (j == y2) {
|
|
if (j + 1 != y1) {
|
|
xacc = 0;
|
|
vs_scanline_resample_linear_Y (tmp1,
|
|
src->pixels + (j + 1) * src->stride, dest->width, &xacc,
|
|
x_increment);
|
|
y1 = j + 1;
|
|
}
|
|
vs_scanline_merge_linear_Y (dest->pixels + i * dest->stride,
|
|
tmp2, tmp1, dest->width, x);
|
|
} else {
|
|
xacc = 0;
|
|
vs_scanline_resample_linear_Y (tmp1, src->pixels + j * src->stride,
|
|
dest->width, &xacc, x_increment);
|
|
y1 = j;
|
|
xacc = 0;
|
|
vs_scanline_resample_linear_Y (tmp2,
|
|
src->pixels + (j + 1) * src->stride, dest->width, &xacc,
|
|
x_increment);
|
|
y2 = (j + 1);
|
|
vs_scanline_merge_linear_Y (dest->pixels + i * dest->stride,
|
|
tmp1, tmp2, dest->width, x);
|
|
}
|
|
}
|
|
|
|
acc += y_increment;
|
|
}
|
|
}
|
|
|
|
/* RGB565 */
|
|
|
|
void
|
|
vs_image_scale_nearest_RGB565 (const VSImage * dest, const VSImage * src,
|
|
uint8_t * tmpbuf)
|
|
{
|
|
int acc;
|
|
int y_increment;
|
|
int x_increment;
|
|
int i;
|
|
int j;
|
|
int x;
|
|
int xacc;
|
|
|
|
y_increment = ((src->height - 1) << 16) / (dest->height - 1);
|
|
x_increment = ((src->width - 1) << 16) / (dest->width - 1);
|
|
|
|
acc = 0;
|
|
for (i = 0; i < dest->height; i++) {
|
|
j = acc >> 16;
|
|
x = acc & 0xffff;
|
|
|
|
xacc = 0;
|
|
vs_scanline_resample_nearest_RGB565 (dest->pixels + i * dest->stride,
|
|
src->pixels + j * src->stride, dest->width, &xacc, x_increment);
|
|
|
|
acc += y_increment;
|
|
}
|
|
}
|
|
|
|
void
|
|
vs_image_scale_linear_RGB565 (const VSImage * dest, const VSImage * src,
|
|
uint8_t * tmpbuf)
|
|
{
|
|
int acc;
|
|
int y_increment;
|
|
int x_increment;
|
|
uint8_t *tmp1;
|
|
uint8_t *tmp2;
|
|
int y1;
|
|
int y2;
|
|
int i;
|
|
int j;
|
|
int x;
|
|
int dest_size;
|
|
int xacc;
|
|
|
|
y_increment = ((src->height - 1) << 16) / (dest->height - 1);
|
|
x_increment = ((src->width - 1) << 16) / (dest->width - 1);
|
|
|
|
dest_size = dest->width * 2;
|
|
|
|
tmp1 = tmpbuf;
|
|
tmp2 = tmpbuf + dest_size;
|
|
|
|
acc = 0;
|
|
xacc = 0;
|
|
y2 = -1;
|
|
vs_scanline_resample_linear_RGB565 (tmp1, src->pixels, dest->width, &xacc,
|
|
x_increment);
|
|
y1 = 0;
|
|
for (i = 0; i < dest->height; i++) {
|
|
j = acc >> 16;
|
|
x = acc & 0xffff;
|
|
|
|
if (x == 0) {
|
|
if (j == y1) {
|
|
memcpy (dest->pixels + i * dest->stride, tmp1, dest_size);
|
|
} else if (j == y2) {
|
|
memcpy (dest->pixels + i * dest->stride, tmp2, dest_size);
|
|
} else {
|
|
xacc = 0;
|
|
vs_scanline_resample_linear_RGB565 (tmp1, src->pixels + j * src->stride,
|
|
dest->width, &xacc, x_increment);
|
|
y1 = j;
|
|
memcpy (dest->pixels + i * dest->stride, tmp1, dest_size);
|
|
}
|
|
} else {
|
|
if (j == y1) {
|
|
if (j + 1 != y2) {
|
|
xacc = 0;
|
|
vs_scanline_resample_linear_RGB565 (tmp2,
|
|
src->pixels + (j + 1) * src->stride, dest->width, &xacc,
|
|
x_increment);
|
|
y2 = j + 1;
|
|
}
|
|
vs_scanline_merge_linear_RGB565 (dest->pixels + i * dest->stride,
|
|
tmp1, tmp2, dest->width, x);
|
|
} else if (j == y2) {
|
|
if (j + 1 != y1) {
|
|
xacc = 0;
|
|
vs_scanline_resample_linear_RGB565 (tmp1,
|
|
src->pixels + (j + 1) * src->stride, dest->width, &xacc,
|
|
x_increment);
|
|
y1 = j + 1;
|
|
}
|
|
vs_scanline_merge_linear_RGB565 (dest->pixels + i * dest->stride,
|
|
tmp2, tmp1, dest->width, x);
|
|
} else {
|
|
xacc = 0;
|
|
vs_scanline_resample_linear_RGB565 (tmp1, src->pixels + j * src->stride,
|
|
dest->width, &xacc, x_increment);
|
|
y1 = j;
|
|
xacc = 0;
|
|
vs_scanline_resample_linear_RGB565 (tmp2,
|
|
src->pixels + (j + 1) * src->stride, dest->width, &xacc,
|
|
x_increment);
|
|
y2 = (j + 1);
|
|
vs_scanline_merge_linear_RGB565 (dest->pixels + i * dest->stride,
|
|
tmp1, tmp2, dest->width, x);
|
|
}
|
|
}
|
|
|
|
acc += y_increment;
|
|
}
|
|
}
|
|
|
|
/* RGB555 */
|
|
|
|
void
|
|
vs_image_scale_nearest_RGB555 (const VSImage * dest, const VSImage * src,
|
|
uint8_t * tmpbuf)
|
|
{
|
|
int acc;
|
|
int y_increment;
|
|
int x_increment;
|
|
int i;
|
|
int j;
|
|
int x;
|
|
int xacc;
|
|
|
|
y_increment = ((src->height - 1) << 16) / (dest->height - 1);
|
|
x_increment = ((src->width - 1) << 16) / (dest->width - 1);
|
|
|
|
acc = 0;
|
|
for (i = 0; i < dest->height; i++) {
|
|
j = acc >> 16;
|
|
x = acc & 0xffff;
|
|
|
|
xacc = 0;
|
|
vs_scanline_resample_nearest_RGB555 (dest->pixels + i * dest->stride,
|
|
src->pixels + j * src->stride, dest->width, &xacc, x_increment);
|
|
|
|
acc += y_increment;
|
|
}
|
|
}
|
|
|
|
void
|
|
vs_image_scale_linear_RGB555 (const VSImage * dest, const VSImage * src,
|
|
uint8_t * tmpbuf)
|
|
{
|
|
int acc;
|
|
int y_increment;
|
|
int x_increment;
|
|
uint8_t *tmp1;
|
|
uint8_t *tmp2;
|
|
int y1;
|
|
int y2;
|
|
int i;
|
|
int j;
|
|
int x;
|
|
int dest_size;
|
|
int xacc;
|
|
|
|
y_increment = ((src->height - 1) << 16) / (dest->height - 1);
|
|
x_increment = ((src->width - 1) << 16) / (dest->width - 1);
|
|
|
|
dest_size = dest->width * 2;
|
|
|
|
tmp1 = tmpbuf;
|
|
tmp2 = tmpbuf + dest_size;
|
|
|
|
acc = 0;
|
|
xacc = 0;
|
|
y2 = -1;
|
|
vs_scanline_resample_linear_RGB555 (tmp1, src->pixels, dest->width, &xacc,
|
|
x_increment);
|
|
y1 = 0;
|
|
for (i = 0; i < dest->height; i++) {
|
|
j = acc >> 16;
|
|
x = acc & 0xffff;
|
|
|
|
if (x == 0) {
|
|
if (j == y1) {
|
|
memcpy (dest->pixels + i * dest->stride, tmp1, dest_size);
|
|
} else if (j == y2) {
|
|
memcpy (dest->pixels + i * dest->stride, tmp2, dest_size);
|
|
} else {
|
|
xacc = 0;
|
|
vs_scanline_resample_linear_RGB555 (tmp1, src->pixels + j * src->stride,
|
|
dest->width, &xacc, x_increment);
|
|
y1 = j;
|
|
memcpy (dest->pixels + i * dest->stride, tmp1, dest_size);
|
|
}
|
|
} else {
|
|
if (j == y1) {
|
|
if (j + 1 != y2) {
|
|
xacc = 0;
|
|
vs_scanline_resample_linear_RGB555 (tmp2,
|
|
src->pixels + (j + 1) * src->stride, dest->width, &xacc,
|
|
x_increment);
|
|
y2 = j + 1;
|
|
}
|
|
vs_scanline_merge_linear_RGB555 (dest->pixels + i * dest->stride,
|
|
tmp1, tmp2, dest->width, x);
|
|
} else if (j == y2) {
|
|
if (j + 1 != y1) {
|
|
xacc = 0;
|
|
vs_scanline_resample_linear_RGB555 (tmp1,
|
|
src->pixels + (j + 1) * src->stride, dest->width, &xacc,
|
|
x_increment);
|
|
y1 = j + 1;
|
|
}
|
|
vs_scanline_merge_linear_RGB555 (dest->pixels + i * dest->stride,
|
|
tmp2, tmp1, dest->width, x);
|
|
} else {
|
|
xacc = 0;
|
|
vs_scanline_resample_linear_RGB555 (tmp1, src->pixels + j * src->stride,
|
|
dest->width, &xacc, x_increment);
|
|
y1 = j;
|
|
xacc = 0;
|
|
vs_scanline_resample_linear_RGB555 (tmp2,
|
|
src->pixels + (j + 1) * src->stride, dest->width, &xacc,
|
|
x_increment);
|
|
y2 = (j + 1);
|
|
vs_scanline_merge_linear_RGB555 (dest->pixels + i * dest->stride,
|
|
tmp1, tmp2, dest->width, x);
|
|
}
|
|
}
|
|
|
|
acc += y_increment;
|
|
}
|
|
}
|