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git-svn-id: http://svn.code.sf.net/p/netpbm/code/trunk@1 9d0c8265-081b-0410-96cb-a4ca84ce46f8

1 files changed, 114 insertions, 0 deletions

diff --git a/editor/ppmflash.c b/editor/ppmflash.c
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index 00000000..d1d048df
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+++ b/editor/ppmflash.c
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+
+/*********************************************************************/
+/* ppmflash -  brighten a picture up to total whiteout               */
+/* Frank Neumann, August 1993                                        */
+/* V1.4 16.11.1993                                                   */
+/*                                                                   */
+/* version history:                                                  */
+/* V1.0 ~ 15.August 1993    first version                            */
+/* V1.1 03.09.1993          uses ppm libs & header files             */
+/* V1.2 03.09.1993          integer arithmetics instead of float     */
+/*                          (gains about 50 % speed up)              */
+/* V1.3 11.10.1993          reads only one line at a time - this     */
+/*                          saves LOTS of memory on big picturs      */
+/* V1.4 16.11.1993          Rewritten to be NetPBM.programming con-  */
+/*                          forming                                  */
+/*********************************************************************/
+
+#include "ppm.h"
+
+/* global variables */
+#ifdef AMIGA
+static char *version = "$VER: ppmflash 1.4 (16.11.93)";
+#endif
+
+/**************************/
+/* start of main function */
+/**************************/
+int main(argc, argv)
+    int argc;
+    char *argv[];
+{
+    FILE* ifp;
+    int argn, rows, cols, i, j, format;
+    pixel *srcrow, *destrow;
+    pixel *pP, *pP2;
+    pixval maxval;
+    double flashfactor;
+    long longfactor;
+    const char* const usage = "flashfactor [ppmfile]\n        flashfactor: 0.0 = original picture, 1.0 = total whiteout\n";
+
+    /* parse in 'default' parameters */
+    ppm_init( &argc, argv );
+
+    argn = 1;
+
+    /* parse in flash factor */
+    if (argn == argc)
+        pm_usage(usage);
+    if (sscanf(argv[argn], "%lf", &flashfactor) != 1)
+        pm_usage(usage);
+    if (flashfactor < 0.0 || flashfactor > 1.0)
+        pm_error("flash factor must be in the range from 0.0 to 1.0 ");
+    ++argn;
+
+    /* parse in filename (if present, stdin otherwise) */
+    if (argn != argc)
+    {
+        ifp = pm_openr(argv[argn]);
+        ++argn;
+    }
+    else
+        ifp = stdin;
+
+    if (argn != argc)
+        pm_usage(usage);
+
+    /* read first data from file */
+    ppm_readppminit(ifp, &cols, &rows, &maxval, &format);
+
+    /* no error checking required here, ppmlib does it all for us */
+    srcrow = ppm_allocrow(cols);
+
+    longfactor = (long)(flashfactor * 65536);
+
+    /* allocate a row of pixel data for the new pixels */
+    destrow = ppm_allocrow(cols);
+
+    ppm_writeppminit(stdout, cols, rows, maxval, 0);
+
+    /** now do the flashing **/
+    /* the 'float' parameter for flashing is sort of faked - in fact, we */
+    /* convert it to a range from 0 to 65536 for integer math. Shouldn't */
+    /* be something you'll have to worry about, though. */
+
+    for (i = 0; i < rows; i++) {
+        ppm_readppmrow(ifp, srcrow, cols, maxval, format);
+
+        pP = srcrow;
+        pP2 = destrow;
+
+        for (j = 0; j < cols; j++) {
+            PPM_ASSIGN(*pP2, 
+                       PPM_GETR(*pP) + 
+                       (((maxval - PPM_GETR(*pP)) * longfactor) >> 16),
+                       PPM_GETG(*pP) + 
+                       (((maxval - PPM_GETG(*pP)) * longfactor) >> 16),
+                       PPM_GETB(*pP) + 
+                       (((maxval - PPM_GETB(*pP)) * longfactor) >> 16));
+
+            pP++;
+            pP2++;
+        }
+
+        /* write out one line of graphic data */
+        ppm_writeppmrow(stdout, destrow, cols, maxval, 0);
+    }
+
+    pm_close(ifp);
+    ppm_freerow(srcrow);
+    ppm_freerow(destrow);
+
+    exit(0);
+}
+