created libwinnie (library), winnie (the server application) and clients

[winnie] / libwinnie / src / pixmap.cc

diff --git a/libwinnie/src/pixmap.cc b/libwinnie/src/pixmap.cc
new file mode 100644 (file)
index 0000000..8e50fa3
--- /dev/null
+++ b/libwinnie/src/pixmap.cc
@@ -0,0 +1,177 @@
+/*
+winnie - an experimental window system
+
+Copyright (C) 2013 Eleni Maria Stea
+
+This program 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 3 of the License, or
+(at your option) any later version.
+
+This program 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 program.  If not, see <http://www.gnu.org/licenses/>.
+
+Author: Eleni Maria Stea <elene.mst@gmail.com>
+*/
+
+#include <stdio.h>
+#include <string.h>
+#include <errno.h>
+#include "pixmap.h"
+
+Pixmap::Pixmap()
+{
+       width = height = 0;
+       pixels = 0;
+}
+
+Pixmap::Pixmap(const Pixmap &pixmap)
+{
+       width = height = 0;
+       pixels = 0;
+       set_image(pixmap.width, pixmap.height, pixmap.pixels);
+}
+
+Pixmap &Pixmap::operator=(const Pixmap &pixmap)
+{
+       if(this != &pixmap) {
+               set_image(pixmap.width, pixmap.height, pixmap.pixels);
+       }
+
+       return *this;
+}
+
+Pixmap::~Pixmap()
+{
+       if(pixels) {
+               delete [] pixels;
+       }
+}
+
+int Pixmap::get_width() const
+{
+       return width;
+}
+
+int Pixmap::get_height() const
+{
+       return height;
+}
+
+Rect Pixmap::get_rect() const
+{
+       Rect rect(0, 0, width, height);
+       return rect;
+}
+
+bool Pixmap::set_image(int x, int y, unsigned char *pix)
+{
+       delete [] pixels;
+
+       pixels = new unsigned char[x * y * 4];
+       width = x;
+       height = y;
+
+       if(pix) {
+               memcpy(pixels, pix, x * y * 4);
+       }
+       return true;
+}
+
+const unsigned char *Pixmap::get_image() const
+{
+       return pixels;
+}
+
+unsigned char *Pixmap::get_image()
+{
+       return pixels;
+}
+
+bool Pixmap::load(const char *fname)
+{
+       FILE *fp;
+       int hdrline = 0;
+
+       if(!(fp = fopen(fname, "rb"))) {
+               fprintf(stderr, "failed to open pixmap: %s: %s\n", fname, strerror(errno));
+               return false;
+       }
+
+       /* read ppm header */
+       while(hdrline < 3) {
+               char buf[64];
+
+               if(!fgets(buf, sizeof buf, fp))
+                       goto err;
+               
+               /* skip comments */
+               if(buf[0] == '#')
+                       continue;
+
+               switch(hdrline++) {
+               case 0:
+                       /* first header line should be P6 */
+                       if(strcmp(buf, "P6\n") != 0)
+                               goto err;
+                       break;
+
+               case 1:
+                       /* second header line contains the pixmap dimensions */
+                       if(sscanf(buf, "%d %d", &width, &height) != 2)
+                               goto err;
+                       break;
+               }
+       }
+
+       set_image(width, height, 0);
+
+       for(int i=0; i<width * height * 4; i++) {
+               int c;
+               if(i % 4 != 3) {
+                       c = fgetc(fp);
+                       if(c < 0)
+                               goto err;
+               }
+               else {
+                       c = 255;
+               }
+               pixels[i] = c;
+       }
+       fclose(fp);
+       return true;
+
+err:
+       fprintf(stderr, "failed to load pixmap: %s\n", fname);
+       fclose(fp);
+       return false;
+}
+
+bool Pixmap::save(const char *fname) const
+{
+       if(!pixels) {
+               return false;
+       }
+
+       FILE *fp = fopen(fname, "wb");
+       if(!fp) {
+               fprintf(stderr, "failed to save pixmap: %s: %s\n", fname, strerror(errno));
+               return false;
+       }
+
+       fprintf(fp, "P6\n%d %d\n255\n", width, height);
+
+       for(int i=0; i<width * height; i++) {
+               fputc(pixels[i * 4], fp);
+               fputc(pixels[i * 4 + 1], fp);
+               fputc(pixels[i * 4 + 2], fp);
+       }
+
+       fclose(fp);
+       return true;
+}