--- /dev/null
+/* 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), data(0) {
+
+ scale_ratio = double(scale) / 100;
+
+ width_ = (int)ceil(src_width * scale_ratio);
+ height_ = (int)ceil(src_height * scale_ratio);
+
+ data = new U8[width_ * height_ * 4];
+}
+
+ScaledPixelBuffer::~ScaledPixelBuffer() {
+ delete [] data;
+}
+
+const U8* ScaledPixelBuffer::getPixelsR(const Rect& r, int* stride) {
+ *stride = getStride();
+ return &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);
+
+ delete [] data;
+ 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 = &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);
+ }
+ }
+}
--- /dev/null
+/* 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.h
+//
+// The ScaledPixelBuffer class allows to scale the image data
+// from the source buffer to destination buffer using bilinear
+// interpolation.
+
+#include <rdr/types.h>
+#include <rfb/Rect.h>
+
+using namespace rdr;
+
+namespace rfb {
+
+ class ScaledPixelBuffer {
+ public:
+ ScaledPixelBuffer(U8 *data, int width, int height, int scale);
+ virtual ~ScaledPixelBuffer();
+
+ // Get width, height, number of pixels and scale
+ int width() const { return width_; }
+ int height() const { return height_; }
+ int area() const { return width_ * height_; }
+ int scale() const { return (int)(scale_ratio * 100); }
+
+ // Get rectangle encompassing this buffer
+ // Top-left of rectangle is either at (0,0), or the specified point.
+ Rect getRect() const { return Rect(0, 0, width_, height_); }
+ Rect getRect(const Point& pos) const {
+ return Rect(pos, pos.translate(Point(width_, height_)));
+ }
+
+ // Get the number of pixels per row in the actual pixel buffer data area
+ virtual int getStride() const { return width(); }
+
+ // Get a pointer into the buffer
+ // The pointer is to the top-left pixel of the specified Rect.
+ // The buffer stride (in pixels) is returned.
+ virtual const U8* getPixelsR(const Rect& r, int* stride);
+
+ // Get pixel data for a given part of the buffer
+ // Data is copied into the supplied buffer, with the specified
+ // stride.
+ virtual void getImage(void* imageBuf, const Rect& r, int stride=0);
+
+ // Set the new scale, in percent
+ virtual void setScale(int scale);
+
+ // Scale rect from the source image buffer to the destination buffer
+ // using bilinear interpolation
+ virtual void scaleRect(const Rect& r);
+
+ protected:
+ int width_;
+ int height_;
+ int src_width;
+ int src_height;
+ int bpp;
+ double scale_ratio;
+ U8 *src_data;
+ U8 *data;
+ };
+
+};
projects / tigervnc.git / commitdiff