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/* Copyright (C) 2005 TightVNC Team. All Rights Reserved.
*
* This is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This software is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this software; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307,
* USA.
*/
// -=- ScaledPixelBuffer.cxx
#include <rfb/ScaledPixelBuffer.h>
#include <math.h>
#include <memory.h>
using namespace rdr;
using namespace rfb;
ScaledPixelBuffer::ScaledPixelBuffer(U8 **src_data_, int src_width_,
int src_height_, int scale)
: src_data(src_data_), src_width(src_width_), src_height(src_height_),
bpp(32), scaled_data(0) {
scale_ratio = double(scale) / 100;
width_ = (int)ceil(src_width * scale_ratio);
height_ = (int)ceil(src_height * scale_ratio);
scaled_data = new U8[width_ * height_ * 4];
}
ScaledPixelBuffer::ScaledPixelBuffer()
: src_data(0), src_width(0), src_height(0), scale_ratio(1), bpp(32),
scaled_data(0) {
}
ScaledPixelBuffer::~ScaledPixelBuffer() {
if (scaled_data) delete [] scaled_data;
}
const U8* ScaledPixelBuffer::getPixelsR(const Rect& r, int* stride) {
*stride = getStride();
return &scaled_data[(r.tl.x + (r.tl.y * *stride)) * bpp/8];
}
void ScaledPixelBuffer::getImage(void* imageBuf, const Rect& r, int outStride) {
int inStride;
const U8* pixels_data = getPixelsR(r, &inStride);
// We assume that the specified rectangle is pre-clipped to the buffer
int bytesPerPixel = bpp/8;
int inBytesPerRow = inStride * bytesPerPixel;
if (!outStride) outStride = r.width();
int outBytesPerRow = outStride * bytesPerPixel;
int bytesPerMemCpy = r.width() * bytesPerPixel;
U8* imageBufPos = (U8*)imageBuf;
const U8* end = pixels_data + (inBytesPerRow * r.height());
while (pixels_data < end) {
memcpy(imageBufPos, pixels_data, bytesPerMemCpy);
imageBufPos += outBytesPerRow;
pixels_data += inBytesPerRow;
}
}
void ScaledPixelBuffer::setScale(int scale) {
if (scale != scale_ratio * 100) {
scale_ratio = double(scale) / 100;
width_ = (int)ceil(src_width * scale_ratio);
height_ = (int)ceil(src_height * scale_ratio);
if (scaled_data) delete [] scaled_data;
scaled_data = new U8[width_ * height_ * 4];
scaleRect(Rect(0, 0, width_, height_));
}
}
void ScaledPixelBuffer::scaleRect(const Rect& r) {
static U8 *src_ptr, *ptr;
static U8 r0, r1, r2, r3;
static U8 g0, g1, g2, g3;
static U8 b0, b1, b2, b3;
static double c1_sub_dx, c1_sub_dy;
static double x_start, x_end, y_start, y_end;
static double dx, dy;
static int i, j;
// Calculate the scale boundaries
x_start = vncmax(0, (r.tl.x-1) * scale_ratio);
(x_start==int(x_start)) ? true : x_start=(int)(x_start+1);
x_end = vncmin(width_ - 1, r.br.x * scale_ratio);
((x_end==int(x_end))&&(x_end!=width_-1)&&(x_end>0)) ? x_end-=1:x_end=(int)(x_end);
y_start = vncmax(0, (r.tl.y-1) * scale_ratio);
(y_start==int(y_start)) ? true : y_start=(int)(y_start+1);
y_end = vncmin(height_ - 1, r.br.y * scale_ratio);
((y_end==int(y_end))&&(y_end!=height_-1)&&(y_end>0)) ? y_end-=1:y_end=(int)(y_end);
// Scale the source rect to the destination image buffer using
// bilinear interplation
for (int y = (int)y_start; y <= y_end; y++) {
j = (int)(dy = y / scale_ratio);
dy -= j;
c1_sub_dy = 1 - dy;
for (int x = (int)x_start; x <= x_end; x++) {
ptr = &scaled_data[(x + y*width_) * 4];
i = (int)(dx = x / scale_ratio);
dx -= i;
c1_sub_dx = 1 - dx;
src_ptr = &(*src_data)[(i + (j*src_width))*4];
b0 = *src_ptr; g0 = *(src_ptr+1); r0 = *(src_ptr+2);
if (i+1 < src_width) {
b1 = *(src_ptr+4); g1 = *(src_ptr+5); r1 = *(src_ptr+6);
} else {
b1 = b0; r1 = r0; g1 = g0;
}
if (j+1 < src_height) {
src_ptr += src_width * 4;
b3 = *src_ptr; g3 = *(src_ptr+1); r3 = *(src_ptr+2);
} else {
b3 = b0; r3 = r0; g3 = g0;
}
if ((i+1 < src_width) && (j+1 < src_height)) {
b2 = *(src_ptr+4); g2 = *(src_ptr+5); r2 = *(src_ptr+6);
} else if (i+1 >= src_width) {
b2 = b3; r2 = r3; g2 = g3;
} else {
b2 = b1; r2 = r1; g2 = g1;
}
*ptr++ = (U8)((b0*c1_sub_dx+b1*dx)*c1_sub_dy + (b3*c1_sub_dx+b2*dx)*dy);
*ptr++ = (U8)((g0*c1_sub_dx+g1*dx)*c1_sub_dy + (g3*c1_sub_dx+g2*dx)*dy);
*ptr = (U8)((r0*c1_sub_dx+r1*dx)*c1_sub_dy + (r3*c1_sub_dx+r2*dx)*dy);
}
}
}
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