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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)
: bpp(32), scaled_data(0), scale_ratio(1), scale(100) {
setSourceBuffer(src_data_, src_width_, src_height_);
}
ScaledPixelBuffer::ScaledPixelBuffer()
: src_data(0), src_width(0), src_height(0), scale_ratio(1), scale(100),
bpp(32), scaled_data(0) {
}
ScaledPixelBuffer::~ScaledPixelBuffer() {
}
void ScaledPixelBuffer::setSourceBuffer(U8 **src_data_, int w, int h) {
src_data = src_data_;
src_width = w;
src_height = h;
calculateScaledBufferSize();
recreateScaledBuffer();
}
void ScaledPixelBuffer::setScale(int scale_) {
if (scale != scale_) {
scale = scale_;
scale_ratio = double(scale) / 100;
calculateScaledBufferSize();
recreateScaledBuffer();
}
}
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 dx, dy;
static int i, j;
static Rect changed_rect;
// Calculate the changed pixel rect in the scaled image
changed_rect = calculateScaleBoundary(r);
// Scale the source rect to the destination image buffer using
// bilinear interplation
for (int y = changed_rect.tl.y; y < changed_rect.br.y; y++) {
j = (int)(dy = y / scale_ratio);
dy -= j;
c1_sub_dy = 1 - dy;
for (int x = changed_rect.tl.x; x < changed_rect.br.x; x++) {
ptr = &scaled_data[(x + y*scaled_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);
}
}
}
Rect ScaledPixelBuffer::calculateScaleBoundary(const Rect& r) {
static int x_start, y_start, x_end, y_end;
x_start = r.tl.x == 0 ? 0 : ceil((r.tl.x-1) * scale_ratio);
y_start = r.tl.y == 0 ? 0 : ceil((r.tl.y-1) * scale_ratio);
x_end = ceil(r.br.x * scale_ratio - 1);
x_end = x_end < scaled_width ? x_end + 1 : scaled_width;
y_end = ceil(r.br.y * scale_ratio - 1);
y_end = y_end < scaled_height ? y_end + 1 : scaled_height;
return Rect(x_start, y_start, x_end, y_end);
}
void ScaledPixelBuffer::calculateScaledBufferSize() {
scaled_width = (int)ceil(src_width * scale_ratio);
scaled_height = (int)ceil(src_height * scale_ratio);
}
void ScaledPixelBuffer::recreateScaledBuffer() {
}
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