From 61405153f478ec8aa7753ea5bf7378da63cadcc9 Mon Sep 17 00:00:00 2001
From: lecoanet
Date: Fri, 12 Oct 2001 07:04:28 +0000
Subject: Suppression de la r�alisation diff�r�e des gradients. Prise en compte
 de l'alpha dans les gradients. Suppression des �l�ments propre � X11 de la
 structure du gradient.

---
 generic/Color.c | 197 +++++++++++++++++++++++++++++---------------------------
 1 file changed, 102 insertions(+), 95 deletions(-)

(limited to 'generic')

diff --git a/generic/Color.c b/generic/Color.c
index 57702c3..c853808 100644
--- a/generic/Color.c
+++ b/generic/Color.c
@@ -857,58 +857,6 @@ HsvToRgb(ZnReal	h,
 /*
  *----------------------------------------------------------------------
  *
- * ZnRealizeGradient --
- *
- *	This procedure allocate the shades still unallocated in
- *	a gradient. The milestone  colors are always allocated
- *	during the gradient's creation.
- *	It's called lazily by ZnGetGradientColor, so that the
- *	colors aren't allocated until something is actually drawn
- *	with them.
- *
- *----------------------------------------------------------------------
- */
-void
-ZnRealizeGradient(ZnGradient	*grad,
-		  Tk_Window	tkwin)
-{
-  int			i, j, num_colors, num_shades;
-  int			red_range, green_range, blue_range;
-  ZnGradientColor	*first, *last;
-  XColor		color;
-  
-  if (grad->realized) {
-    return;
-  }
-
-  /*printf("realizing gradient with %d(%d) colors\n",
-    grad->num_colors, BORDER_STEPS);*/
-  num_colors = grad->num_colors;
-  num_shades = grad->num_shades;
-  for (i = 0; i < grad->num_colors-1; i++) {
-    first = grad->colors[i];
-    last = grad->colors[i+1];
-    /*printf("first color :  %d %d %d, last color : %d %d %d\n",
-	   first->shades[0]->red, first->shades[0]->green, first->shades[0]->blue,
-	   last->shades[0]->red, last->shades[0]->green, last->shades[0]->blue);*/
-    red_range = (int) last->shades[0]->red - (int) first->shades[0]->red;
-    green_range = (int) last->shades[0]->green - (int) first->shades[0]->green;
-    blue_range = (int) last->shades[0]->blue - (int) first->shades[0]->blue;
-    for (j = 1; j < num_shades; j++) {
-      color.red =(int) first->shades[0]->red +  red_range * j/num_shades;
-      color.green = (int) first->shades[0]->green + green_range * j/num_shades;
-      color.blue = (int) first->shades[0]->blue + blue_range * j/num_shades;
-      first->shades[j] = ZnGetColorByValue(tkwin, &color);
-    }
-  }
-
-  grad->realized = True;
-}
-
-
-/*
- *----------------------------------------------------------------------
- *
  * ZnGetGradientColor --
  *
  *----------------------------------------------------------------------
@@ -916,24 +864,24 @@ ZnRealizeGradient(ZnGradient	*grad,
 XColor *
 ZnGetGradientColor(Tk_Window	tkwin,
 		   ZnGradient	*grad,
-		   ZnReal	position)
+		   ZnReal	position,
+		   int		*alpha)
 {
   int			index, min, max;
   ZnGradientColor	*color, *next_color;
   XColor		*shade=NULL;
   ZnReal		tt;
   
-  if (!grad->realized) {
-    ZnRealizeGradient(grad, tkwin);
-  }
-
-  if (grad->num_colors == 1) {
+  if ((grad->num_colors == 1) || (position < 0.0)) {
+    if (alpha) {
+      *alpha = grad->colors[0]->alpha;
+    }
     return grad->colors[0]->shades[0];
   }
-  if (position < 0.0) {
-    shade = grad->colors[0]->shades[0];
-  }
-  else if (position >= 100.0) {
+  if (position >= 100.0) {
+    if (alpha) {
+      *alpha = grad->colors[grad->num_colors-1]->alpha;
+    }
     shade = grad->colors[grad->num_colors-1]->shades[0];
   }
   else {
@@ -957,6 +905,10 @@ ZnGetGradientColor(Tk_Window	tkwin,
     index = (int) tt;
     /*printf("shade index %d %g\n", index, tt);*/
     shade = color->shades[index];
+    if (alpha) {
+      *alpha = ((next_color->alpha-color->alpha) * (position - (ZnReal) color->position) /
+		(ZnReal) (next_color->position - color->position));
+    }
   }
 
   return shade;
@@ -1080,6 +1032,49 @@ ZnGetReliefGradient(Tcl_Interp	*interp,
 
 
 /*
+ *----------------------------------------------------------------------
+ *
+ * RealizeGradient --
+ *
+ *	This procedure allocate the shades still unallocated in
+ *	a gradient. The milestone  colors are always allocated
+ *	during the gradient's creation.
+ *
+ *----------------------------------------------------------------------
+ */
+static void
+RealizeGradient(ZnGradient	*grad,
+		Tk_Window	tkwin)
+{
+  int			i, j, num_colors, num_shades;
+  int			red_range, green_range, blue_range;
+  ZnGradientColor	*first, *last;
+  XColor		color;
+  
+  /*printf("realizing gradient with %d(%d) colors\n",
+    grad->num_colors, BORDER_STEPS);*/
+  num_colors = grad->num_colors;
+  num_shades = grad->num_shades;
+  for (i = 0; i < grad->num_colors-1; i++) {
+    first = grad->colors[i];
+    last = grad->colors[i+1];
+    /*printf("first color :  %d %d %d, last color : %d %d %d\n",
+	   first->shades[0]->red, first->shades[0]->green, first->shades[0]->blue,
+	   last->shades[0]->red, last->shades[0]->green, last->shades[0]->blue);*/
+    red_range = (int) last->shades[0]->red - (int) first->shades[0]->red;
+    green_range = (int) last->shades[0]->green - (int) first->shades[0]->green;
+    blue_range = (int) last->shades[0]->blue - (int) first->shades[0]->blue;
+    for (j = 1; j < num_shades; j++) {
+      color.red =(int) first->shades[0]->red +  red_range * j/num_shades;
+      color.green = (int) first->shades[0]->green + green_range * j/num_shades;
+      color.blue = (int) first->shades[0]->blue + blue_range * j/num_shades;
+      first->shades[j] = ZnGetColorByValue(tkwin, &color);
+    }
+  }
+}
+
+
+/*
  *--------------------------------------------------------------
  *
  * ZnGetGradient --
@@ -1125,8 +1120,8 @@ ZnGetGradient(Tcl_Interp	*interp,
   int		i, j, new, num_colors, num_shades;
   char		type, *scan_ptr;
   int		num_tok, angle;
-  int		x, y;
-  char		color_name[COLOR_NAME_SIZE];
+  double	x, y;
+  char		*color_ptr, color_name[COLOR_NAME_SIZE];
   char		buffer[GRADIENT_NAME_SIZE];
   
   if (!initialized) {
@@ -1159,17 +1154,22 @@ ZnGetGradient(Tcl_Interp	*interp,
     /*
      * Try to obtain how many shades sould be drawn.
      */
-    num_shades = DEFAULT_NUM_SHADES;
+    num_shades = 2; /* Minimum needed to have the start and mid range color */
     if ((scan_ptr = strchr(buffer, '%'))) {
       sscanf(scan_ptr, "%%%d", &num_shades);
       /*printf("num shades = %d\n", num_shades);*/
       *scan_ptr = '\0';
     }
-    /*
-     * Keep num_shades even.
-     */
-    num_shades /= 2;
-    num_shades *= 2;
+    if (num_shades < 2) {
+      num_shades = 2;
+    }
+    else {
+      /*
+       * Keep num_shades even.
+       */
+      num_shades /= 2;
+      num_shades *= 2;
+    }
     /*
      * Then look at the gradient type.
      */
@@ -1187,7 +1187,7 @@ ZnGetGradient(Tcl_Interp	*interp,
       *scan_ptr = '\0';
     }
     else if ((scan_ptr = strchr(buffer, '('))) {
-      num_tok = sscanf(scan_ptr, "(%d %d", &x, &y);
+      num_tok = sscanf(scan_ptr, "(%lf %lf", (double *) &x, (double *) &y);
       if (num_tok == 2) {
 	type = ZN_RADIAL_GRADIENT;
       }
@@ -1209,11 +1209,7 @@ ZnGetGradient(Tcl_Interp	*interp,
      * Create the gradient structure.
      */
     grad = (ZnGradient *) ZnMalloc(sizeof(ZnGradient) +
-				 sizeof(ZnGradientColor *)*(num_colors-1));
-    grad->screen = Tk_Screen(tkwin);
-    grad->visual = Tk_Visual(tkwin);
-    grad->depth = Tk_Depth(tkwin);
-    grad->colormap = key.colormap;
+				   sizeof(ZnGradientColor *)*(num_colors-1));
     grad->ref_count = 1;
     grad->num_shades = num_shades;
     grad->num_colors = num_colors;
@@ -1222,10 +1218,9 @@ ZnGetGradient(Tcl_Interp	*interp,
       grad->g.angle = angle;
     }
     else {
-      grad->g.c.x = x;
-      grad->g.c.y = y;
+      grad->g.p.x = x;
+      grad->g.p.y = y;
     }
-    grad->realized = False;
     grad->hash = hash;
     Tcl_SetHashValue(hash, grad);
 
@@ -1238,7 +1233,11 @@ ZnGetGradient(Tcl_Interp	*interp,
       else {
 	grad->colors[i] = (ZnGradientColor *) ZnMalloc(sizeof(ZnGradientColor));
       }
-      num_tok = sscanf(scan_ptr, "%s %d %d", color_name, &grad->colors[i]->position,
+      grad->colors[i]->position = 0;
+      grad->colors[i]->control = 50;
+      grad->colors[i]->alpha = 100;
+      num_tok = sscanf(scan_ptr, "%s %d %d", color_name,
+		       &grad->colors[i]->position,
 		       &grad->colors[i]->control);
       if (num_tok == 0) {
 	Tcl_AppendResult(interp, "incorrect gradient format \"",
@@ -1251,11 +1250,21 @@ ZnGetGradient(Tcl_Interp	*interp,
 	ZnFree(grad);
 	return NULL;
       }
+      color_ptr = strchr(color_name, ':');
+      if (color_ptr) {
+	*color_ptr = 0;
+      }
       grad->colors[i]->shades[0] = ZnGetColor(interp, tkwin, Tk_GetUid(color_name));
+      if (color_ptr) {
+	*color_ptr = ':';
+      }
       if (grad->colors[i]->shades[0] == NULL) {
 	Tcl_AppendResult(interp, " in gradient,", NULL);
 	goto grad_err;
       }
+      if (color_ptr) {
+	grad->colors[i]->alpha = atoi(color_ptr+1);
+      }
       if (i != num_colors - 1) {
 	for (j = 1; j < num_shades-1; j++) {
 	  grad->colors[i]->shades[j] = NULL;
@@ -1267,10 +1276,7 @@ ZnGetGradient(Tcl_Interp	*interp,
       else if (i == num_colors - 1) {
 	grad->colors[i]->position = 100;
       }
-      else if (num_tok == 1) {
-	grad->colors[i]->position = 0;
-      }
-      if ((num_tok > 1) && (i > 0)) {
+      if ((num_tok > 2) && (i > 0)) {
 	if ((grad->colors[i]->position > 100) ||
 	    (grad->colors[i]->position < 0) ||
 	    (grad->colors[i]->position < grad->colors[i-1]->position)) {
@@ -1279,23 +1285,24 @@ ZnGetGradient(Tcl_Interp	*interp,
 	  goto grad_err;
 	}
       }
-      if (num_tok != 3) {
-	grad->colors[i]->control = 50;
+      if (grad->colors[i]->control < 0) {
+	grad->colors[i]->control = 0;
       }
-      else if ((grad->colors[i]->control < 0) ||
-	       (grad->colors[i]->control > 100)) {
-	Tcl_AppendResult(interp, "incorrect color control in gradient \"",
-			 name, "\",", NULL);
-	goto grad_err;
+      if (grad->colors[i]->control > 100) {
+	grad->colors[i]->control = 100;
+      }
+      if (grad->colors[i]->alpha < 0) {
+	grad->colors[i]->alpha = 0;
+      }
+      if (grad->colors[i]->alpha > 100) {
+	grad->colors[i]->alpha = 100;
       }
       scan_ptr = strtok(NULL, "|");
     }
   }
   
-  /*
-   * Delay the allocation of colors until they are actually
-   * needed for drawing.
-   */
+  RealizeGradient(grad, tkwin);
+
   return grad;
 }
 
-- 
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