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-rw-r--r--common/rfb/ScaledPixelBuffer.cxx225
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diff --git a/common/rfb/ScaledPixelBuffer.cxx b/common/rfb/ScaledPixelBuffer.cxx
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--- a/common/rfb/ScaledPixelBuffer.cxx
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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(scale_), scale_ratio_x(1), scale_ratio_y(1), scaleFilterID(scaleFilterBilinear),
- xWeightTabs(0), yWeightTabs(0), raccum(0), gaccum(0), baccum(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(scaleFilterBilinear),
- xWeightTabs(0), yWeightTabs(0), raccum(0), gaccum(0), baccum(0),
- src_data(0), scaled_data(0) {
- memset(&pf, 0, sizeof(pf));
-}
-
-ScaledPixelBuffer::~ScaledPixelBuffer() {
- freeWeightTabs();
- if (raccum) delete [] raccum;
- if (gaccum) delete [] gaccum;
- if (baccum) delete [] baccum;
-}
-
-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::recreateRowAccum() {
- if (raccum) delete [] raccum;
- if (gaccum) delete [] gaccum;
- if (baccum) delete [] baccum;
- raccum = new int[src_width];
- gaccum = new int[src_width];
- baccum = new int[src_width];
-}
-
-void ScaledPixelBuffer::setSourceBuffer(U8 **src_data_, int w, int h) {
- if (w > 0 && h > 0 && src_data_ != NULL) {
- freeWeightTabs();
- src_data = src_data_;
- src_width = w;
- src_height = h;
- recreateRowAccum();
- 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) {
- scale = scale_;
- freeWeightTabs();
- 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) {
- freeWeightTabs();
- scaleFilters.makeWeightTabs(scaleFilterID, src_width, scaled_width, &xWeightTabs);
- scaleFilters.makeWeightTabs(scaleFilterID, src_height, scaled_height, &yWeightTabs);
- if (scale != 100 && pf.depth > 0 && scaled_data) scaleRect(Rect(0, 0, src_width, src_height));
- }
-}
-
-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;
- U16 r, g, b;
- int red, green, blue;
- short *xweight, *yweight, weight;
-
- // 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;
-
- int bytesPerAccumRow = src_width * sizeof(int);
-
- 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;
-
- // Clear the color accumulators
- memset(raccum, 0, bytesPerAccumRow);
- memset(gaccum, 0, bytesPerAccumRow);
- memset(baccum, 0, bytesPerAccumRow);
-
- // Make the convolution the source image with scale filter weights
- // by y axis and save results to the color accumulators.
- pxs = &(*src_data)[(xWeightTabs[changed_rect.tl.x].i0 + yWeightTabs[y].i0*src_width) * bytesPerSrcPixel];
- for (int ys = yWeightTabs[y].i0; ys < yWeightTabs[y].i1; ys++) {
- px = pxs;
- for (int xs = xWeightTabs[changed_rect.tl.x].i0; xs < xWeightTabs[changed_rect.br.x-1].i1; xs++) {
- pf.rgbFromPixel(*((U32*)px), NULL, &r, &g, &b);
- weight = *yweight;
- raccum[xs] += (int)(weight) * r;
- gaccum[xs] += (int)(weight) * g;
- baccum[xs] += (int)(weight) * b;
- px += bytesPerSrcPixel;
- }
- yweight++;
- pxs += bytesPerSrcRow;
- }
-
- // Make the convolution the color accumulators with scale filter weights
- // by x axis and save results to the scaled image.
- for (int x = changed_rect.tl.x; x < changed_rect.br.x; x++) {
- // Init the sum of colors with (1 << (shift-1)) for rounding.
- red = green = blue = 1 << (FINALSHIFT-1);
- xweight = xWeightTabs[x].weight;
- for (int xs = xWeightTabs[x].i0; xs < xWeightTabs[x].i1; xs++) {
- weight = *xweight;
- red += (int)(weight) * (raccum[xs] >> BITS_OF_CHANEL);
- green += (int)(weight) * (gaccum[xs] >> BITS_OF_CHANEL);
- blue += (int)(weight) * (baccum[xs] >> BITS_OF_CHANEL);
- xweight++;
- }
- *ptr++ = U8(blue >> FINALSHIFT);
- *ptr++ = U8(green >> FINALSHIFT);
- *ptr++ = U8(red >> FINALSHIFT);
- ptr++;
- }
- ptrs += bytesPerScaledRow;
- }
-}
-
-Rect ScaledPixelBuffer::calculateScaleBoundary(const Rect& r) {
- int x_start, y_start, x_end, y_end;
- double translate_x = 0.5*scale_ratio_x - 0.5;
- double translate_y = 0.5*scale_ratio_y - 0.5;
- double sourceXScale = __rfbmax(1.0, 1.0/scale_ratio_x);
- double sourceYScale = __rfbmax(1.0, 1.0/scale_ratio_y);
- double sourceXRadius = __rfbmax(0.5, sourceXScale*scaleFilters[scaleFilterID].radius);
- double sourceYRadius = __rfbmax(0.5, sourceYScale*scaleFilters[scaleFilterID].radius);
- x_start = (int)ceil(scale_ratio_x*(r.tl.x-sourceXRadius) + translate_x + SCALE_ERROR);
- y_start = (int)ceil(scale_ratio_y*(r.tl.y-sourceYRadius) + translate_y + SCALE_ERROR);
- x_end = (int)floor(scale_ratio_x*((r.br.x-1)+sourceXRadius) + translate_x - SCALE_ERROR) + 1;
- y_end = (int)floor(scale_ratio_y*((r.br.y-1)+sourceXRadius) + translate_y - SCALE_ERROR) + 1;
- 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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