Changes between Initial Version and Version 1 of PgmInputOutput

Timestamp:

Feb 10, 2007, 7:48:34 PM (19 years ago)

Author:

alain

Comment:

--

PgmInputOutput

@@ +1 @@
+{{{
+/********************************************************************
+            gmap: image structure, greyscale pixels.
+The width field contains the width of the image,
+- The height field contains the height of the image,
+- The raster pointer points to a memory area containing
+the image pixel, 8 bits per pixel, 0 is black, 255 is white.
+The (0,0) coordinate is the upper left corner of the image, and
+its address is raster. The (1,0) coordinate is at address raster + 1.
+The (0,1) coordinate is at address raster + width.
+**********************************************************************/
+typedef struct gmap {
+short                width;
+short                height;
+unsigned char  *raster;
+} gmap;
+
+/*********************************************************************
+         readpgm()
+This function reads the pgmfile whose name is given as argument
+and creates a gmap structure filled with the image.
+This function allocate the memory requested to store the image.
+If either the file cannot be opened or not enough memory
+remains readpgm returns NULL
+**********************************************************************/
+extern gmap *readpgm(char *name);
+
+/*********************************************************************
+         writepgm:
+This function writes the gmap map into the file whose name is 
+given as argument.
+If the file cannot be opened, writepgm returns NULL.
+**********************************************************************/
+extern int   writepgm(gmap *map, char *name);
+}}}