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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/Exception.h>
#include <rfb/ScaledPixelBuffer.h>
#include <math.h>
#include <memory.h>
#include <stdlib.h>
using namespace rdr;
using namespace rfb;
ScaledPixelBuffer::ScaledPixelBuffer(U8 **src_data_, int src_width_,
int src_height_, int scale, PixelFormat pf_)
: scale(100), scale_ratio_x(1), scale_ratio_y(1), scaleFilterID(scaleFilterBicubic),
xWeightTabs(0), yWeightTabs(0), scaled_data(0) {
setSourceBuffer(src_data_, src_width_, src_height_);
setPF(pf_);
}
ScaledPixelBuffer::ScaledPixelBuffer()
: src_width(0), src_height(0), scaled_width(0), scaled_height(0), scale(100),
scale_ratio_x(1), scale_ratio_y(1), scaleFilterID(scaleFilterBicubic),
xWeightTabs(0), yWeightTabs(0), src_data(0), scaled_data(0) {
memset(&pf, 0, sizeof(pf));
}
ScaledPixelBuffer::~ScaledPixelBuffer() {
freeWeightTabs();
}
void ScaledPixelBuffer::freeWeightTabs() {
if (xWeightTabs) {
for (int i = 0; i < scaled_width; i++) delete [] xWeightTabs[i].weight;
delete [] xWeightTabs;
xWeightTabs = 0;
}
if (yWeightTabs) {
for (int i = 0; i < scaled_height; i++) delete [] yWeightTabs[i].weight;
delete [] yWeightTabs;
yWeightTabs = 0;
}
}
void ScaledPixelBuffer::setSourceBuffer(U8 **src_data_, int w, int h) {
freeWeightTabs();
src_data = src_data_;
src_width = w;
src_height = h;
calculateScaledBufferSize();
scaleFilters.makeWeightTabs(scaleFilterID, src_width, scaled_width, &xWeightTabs);
scaleFilters.makeWeightTabs(scaleFilterID, src_height, scaled_height, &yWeightTabs);
}
void ScaledPixelBuffer::setPF(const PixelFormat &pf_) {
///if (pf_.depth != 24) throw rfb::UnsupportedPixelFormatException();
pf = pf_;
}
void ScaledPixelBuffer::setScale(int scale_) {
if (scale != scale_ && scale_ > 0) {
freeWeightTabs();
scale = scale_;
calculateScaledBufferSize();
scaleFilters.makeWeightTabs(scaleFilterID, src_width, scaled_width, &xWeightTabs);
scaleFilters.makeWeightTabs(scaleFilterID, src_height, scaled_height, &yWeightTabs);
}
}
void ScaledPixelBuffer::setScaleFilter(unsigned int scaleFilterID_) {
if (scaleFilterID == scaleFilterID_ || scaleFilterID_ > scaleFilterMaxNumber) return;
scaleFilterID = scaleFilterID_;
if (src_width && src_height && scaled_width && scaled_height && pf.depth > 0) {
freeWeightTabs();
scaleFilters.makeWeightTabs(scaleFilterID, src_width, scaled_width, &xWeightTabs);
scaleFilters.makeWeightTabs(scaleFilterID, src_height, scaled_height, &yWeightTabs);
if (scale != 100) scaleRect(Rect(0, 0, src_width, src_height));
}
}
inline void ScaledPixelBuffer::rgbFromPixel(U32 p, int &r, int &g, int &b) {
r = (((p >> pf.redShift ) & pf.redMax ) * 255 + pf.redMax /2) / pf.redMax;
g = (((p >> pf.greenShift) & pf.greenMax) * 255 + pf.greenMax/2) / pf.greenMax;
b = (((p >> pf.blueShift ) & pf.blueMax ) * 255 + pf.blueMax /2) / pf.blueMax;
}
inline U32 ScaledPixelBuffer::getSourcePixel(int x, int y) {
int bytes_per_pixel = pf.bpp / 8;
U8 *ptr = &(*src_data)[(x + y*src_width)*bytes_per_pixel];
if (bytes_per_pixel == 1) {
return *ptr;
} else if (bytes_per_pixel == 2) {
int b0 = *ptr++; int b1 = *ptr;
return b1 << 8 | b0;
} else if (bytes_per_pixel == 4) {
int b0 = *ptr++; int b1 = *ptr++;
int b2 = *ptr++; int b3 = *ptr;
return b3 << 24 | b2 << 16 | b1 << 8 | b0;
} else {
return 0;
}
}
void ScaledPixelBuffer::scaleRect(const Rect& rect) {
Rect changed_rect;
U8 *ptr, *ptrs, *px, *pxs;
double rx, gx, bx, red, green, blue, *xweight, *yweight, xWeight, yWeight;
int r, g, b, xwi, ywi;
// Calculate the changed pixel rect in the scaled image
changed_rect = calculateScaleBoundary(rect);
int bytesPerSrcPixel = pf.bpp / 8;
int bytesPerSrcRow = src_width * bytesPerSrcPixel;
int bytesPerScaledRow = scaled_width * 4;
ptrs = &(*scaled_data)[(changed_rect.tl.x + changed_rect.tl.y*scaled_width) * 4];
for (int y = changed_rect.tl.y; y < changed_rect.br.y; y++) {
ptr = ptrs;
yweight = yWeightTabs[y].weight;
for (int x = changed_rect.tl.x; x < changed_rect.br.x; x++) {
ywi = 0; red = 0; green = 0; blue = 0;
xweight = xWeightTabs[x].weight;
// Calculate the scaled pixel value at (x, y) coordinates by
// convolution the matrix from source image:
// [(xWeight.i0,yWeight.i0)......(xWeight.i1-1,yWeight.i0)]
// [......................................................]
// [(xWeight.i0,yWeight.i1-1)..(xWeight.i1-1,yWeight.i1-1)],
// where [i0, i1) is the scaled filter interval.
pxs = &(*src_data)[(xWeightTabs[x].i0 + yWeightTabs[y].i0*src_width) * bytesPerSrcPixel];
for (int ys = yWeightTabs[y].i0; ys < yWeightTabs[y].i1; ys++) {
xwi = 0; rx = 0; gx = 0; bx = 0; px = pxs;
for (int xs = xWeightTabs[x].i0; xs < xWeightTabs[x].i1; xs++) {
rgbFromPixel(*((U32*)px), r, g, b);
xWeight = xweight[xwi++];
rx += r * xWeight;
gx += g * xWeight;
bx += b * xWeight;
px += bytesPerSrcPixel;
}
yWeight = yweight[ywi++];
red += rx * yWeight;
green += gx * yWeight;
blue += bx * yWeight;
pxs += bytesPerSrcRow;
}
*ptr++ = U8(blue);
*ptr++ = U8(green);
*ptr++ = U8(red);
ptr++;
}
ptrs += bytesPerScaledRow;
}
}
Rect ScaledPixelBuffer::calculateScaleBoundary(const Rect& r) {
int x_start, y_start, x_end, y_end;
double radius = scaleFilters[scaleFilterID].radius;
double translate_x = 0.5*scale_ratio_x - 0.5;
double translate_y = 0.5*scale_ratio_y - 0.5;
x_start = (int)ceil(scale_ratio_x*(r.tl.x-radius) + translate_x);
y_start = (int)ceil(scale_ratio_y*(r.tl.y-radius) + translate_y);
x_end = (int)ceil(scale_ratio_x*(r.br.x+radius) + translate_x);
y_end = (int)ceil(scale_ratio_y*(r.br.y+radius) + translate_y);
if (x_start < 0) x_start = 0;
if (y_start < 0) y_start = 0;
if (x_end > scaled_width) x_end = scaled_width;
if (y_end > scaled_height) y_end = scaled_height;
return Rect(x_start, y_start, x_end, y_end);
}
void ScaledPixelBuffer::calculateScaledBufferSize() {
double scale_ratio = (double)scale / 100;
scaled_width = (int)ceil(src_width * scale_ratio);
scaled_height = (int)ceil(src_height * scale_ratio);
scale_ratio_x = (double)scaled_width / src_width;
scale_ratio_y = (double)scaled_height / src_height;
}
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