Changeset 13479 for trunk/Ohana/src/kapa2/src/JPEGit24.c

Timestamp:

May 22, 2007, 12:23:09 PM (19 years ago)

Author:

eugene

Message:

upgrading to kapa 2.0 API, upgrades to dvo user interface

File:

• trunk/Ohana/src/kapa2/src/JPEGit24.c (modified) (5 diffs)

trunk/Ohana/src/kapa2/src/JPEGit24.c

@@ -6 +6 @@
 # define WHITE_B 255
 
-// XXX this currently writes out the jpeg for the active image
-int JPEGit24 () {
+static float slope = 1.0;
+static float start = 0.0;
+static int MaxValue = 255;
+
+// XXX inline this if needed
+static int PixelLookup(float value) {
+  int out;
+  out = MIN (MAX (slope * value - start, 0), MaxValue);
+  return (out);
+}
+
+// XXX this currently writes out the jpeg for just the active image
+int JPEGit24 (int sock) {
 
   struct jpeg_compress_struct cinfo;
@@ -21 +32 @@
   int i_start, i_end, j_start, j_end;
   int dropback;  /* this is a bit of a kludge... */
-  int dx, dy, DX, DY;
+  int dx, dy, DX, DY, pixelN;
   int status, Nbytes, quality;
   int expand_in, expand_out;
   double expand, Rx, Ry, X, Y;
-  unsigned char *out_pix, *in_pix, *in_pix_ref;
+  unsigned char *out_pix;
+  float *imdata, *in_pix, *in_pix_ref;
   unsigned char pixel1[256], pixel2[256], pixel3[256];
   char filename[1024];
   FILE *f;
 
+  /* expect a line telling the number of bytes and a filename */
+  KiiScanMessage (sock, "%s", filename);
+
   graphic = GetGraphic();
   section = GetActiveSection();
   image   = section->image;
-
-  /* expect a line telling the number of bytes and a filename */
-  KiiScanMessage (sock, "%s", filename);
+  if (image == NULL) return (TRUE);
 
   /***** JPEG init calls */
@@ -69 +82 @@
   }
 
+  // define the color transform parameters
+  MaxValue = graphic[0].Npixels - 1;
+  if (image[0].range != 0.0) {
+    slope = graphic[0].Npixels / image[0].range;
+    start = graphic[0].Npixels * image[0].zero / image[0].range;
+  } else {
+    slope = 1.0;
+    start = image[0].zero;
+  }
+
   expand = expand_in = expand_out = 1.0;
   if (image[0].expand == 0) /* set up expansions */
@@ -122 +145 @@
   ALLOCATE (line_buffer, JSAMPLE, 3*dx);
 
-  in_pix_ref  = (unsigned char *) (image[0].matrix.buffer) + DX*(int)MAX(Y,0) + (int)MAX(X,0);
+  imdata = (float *) image[0].matrix.buffer;
+  in_pix_ref = &imdata[DX*(int)MAX(Y,0) + (int)MAX(X,0)];
 
   /********** below we do the mapping from buffer pixels (in) to picture pixels (out) **********/
@@ -153 +177 @@
     /*** fill in the picture region ***/
     for (i = i_start; i < i_end; i+=expand_out, in_pix+=expand_in) {
+      pixelN = PixelLookup(*in_pix);
       for (ii = 0; ii < expand_out; ii++, out_pix+=3) {
-        out_pix[0] = pixel1[*in_pix];
-        out_pix[1] = pixel2[*in_pix];
-        out_pix[2] = pixel3[*in_pix];
+        out_pix[0] = pixel1[pixelN];
+        out_pix[1] = pixel2[pixelN];
+        out_pix[2] = pixel3[pixelN];
       }
     }