third massive import batch

2022-06-27 00:48:18 +02:00
parent 96d7a5399f
commit f3e30ea3bb
54 changed files with 4737 additions and 123 deletions
--- a/Lib/halfsize.c
+++ b/Lib/halfsize.c
@@ -0,0 +1,105 @@
+
+/*
+                    halfsize.c
+		------------------
+	
+	see also: scale.c doublesz.c
+
+*/
+
+#include   <stdio.h>
+#include   <stdlib.h>
+#include   <math.h>
+
+#include   "../tthimage.h"
+
+/*::------------------------------------------------------------------::*/
+/*
+ *	Fabrication d'une image moitié de l'image source.
+ *
+ *	cette fonction alloue une _nouvelle_ image
+ *                                ==========
+ *	méthodes:
+ *		0: primitive.
+ *		1: semblant d'interpolation.
+ *
+ */
+Image_Desc *
+Image_MakeHalfSize(Image_Desc *image, int methode)
+{
+int		largeur, hauteur, x, y, xx, yy;
+Image_Desc	*demi;
+
+largeur = image->width / 2;     hauteur = image->height / 2;
+
+if (image->type != IMAGE_RGB)
+	{
+	fprintf(stderr, "Image HalfSize: bad image type %d\n", image->type);
+	return NULL;
+	}
+
+#if DEBUG_LEVEL
+fprintf(stderr, "MakeHalfSize: from %dx%d, method %d  -> %d x %d\n",
+		image->width, image->height, methode, largeur, hauteur);
+#endif
+
+demi = Image_alloc(largeur, hauteur, image->type);
+if ( demi == NULL )
+	{
+	fprintf(stderr, "Image make half size: no memory\n");
+	exit(5);
+	}
+
+/*
+ *	ne faudrait-il pas transmettre certains des attributs de
+ *	l'image originale à la nouvelle image ?
+ */
+demi->modified = 0;
+demi->errmsg = image->errmsg;
+
+for (y=0; y<hauteur; y++)
+    {
+    yy = y * 2;
+    for (x=0; x<largeur; x++)
+        {
+        xx = x * 2;
+        switch(methode)
+            {
+            case 0:
+                (demi->Rpix[y])[x] = (image->Rpix[yy])[xx];
+                (demi->Gpix[y])[x] = (image->Gpix[yy])[xx];
+                (demi->Bpix[y])[x] = (image->Bpix[yy])[xx];
+                break;
+
+	    case 1:
+                (demi->Rpix[y])[x] = (	 (image->Rpix[yy])[xx]   +
+					 (image->Rpix[yy+1])[xx] +
+					 (image->Rpix[yy])[xx+1] +
+					 (image->Rpix[yy+1])[xx+1] ) / 4;
+           
+                (demi->Gpix[y])[x] = (	 (image->Gpix[yy])[xx]   +
+					 (image->Gpix[yy+1])[xx] +
+					 (image->Gpix[yy])[xx+1] +
+					 (image->Gpix[yy+1])[xx+1] ) / 4;
+           
+                (demi->Bpix[y])[x] = (	 (image->Bpix[yy])[xx]   +
+					 (image->Bpix[yy+1])[xx] +
+					 (image->Bpix[yy])[xx+1] +
+					 (image->Bpix[yy+1])[xx+1] ) / 4;
+           
+		break;
+
+	    default:
+		/*
+		 * et ici, un message d'erreur ?
+		 */
+		break;
+            }
+        }
+    }
+
+demi->modified = 1;
+
+return demi;		/* demi is a pointer to an Image_Desc ! */
+}
+/*::------------------------------------------------------------------::*/