[magick-developers] [Patch] Support for -density & -units in PSD writer (inlined)

[Markus Dahms]

Hi there,

as there were no reaction on my problem on magick-bugs I fixed it
myself.

The PSD writer now supports saving PixelsPer(Inch|Centimeter) values.

If there are no objections please apply the patch to
ImageMagick (it is against version 6.5.0-9).

thanks,

Markus

--- ImageMagick-6.5.0-9/coders/psd.c    2009-03-24 03:39:05.000000000 +0100
+++ ImageMagick-6.5.0-9_patched/coders/psd.c    2009-03-27 13:00:00.107158090 
+0100
@@ -1652,6 +1652,33 @@
     (void) WriteBlobByte(inImage,0);
 }
 
+static void WriteResolutionInfo(Image *image)
+{
+  unsigned long xres_fix, yres_fix;
+  unsigned short psd_unit;
+
+  if(image->units == PixelsPerCentimeterResolution) {
+    xres_fix = 2.54 * image->x_resolution * 65536.0 + .5;
+    yres_fix = 2.54 * image->y_resolution * 65536.0 + .5;
+    psd_unit = 2;
+  } else {
+    xres_fix = image->x_resolution * 65536.0 + .5;
+    yres_fix = image->y_resolution * 65536.0 + .5;
+    psd_unit = 1;
+  }
+
+  (void) WriteBlob(image, 4, (unsigned char *) "8BIM");
+  (void) WriteBlobMSBShort(image, 0x03ED);
+  (void) WriteBlobMSBShort(image, 0);
+  (void) WriteBlobMSBLong(image, 16); /* resource size */
+  (void) WriteBlobMSBLong(image, xres_fix);
+  (void) WriteBlobMSBShort(image, psd_unit); /* hres unit */
+  (void) WriteBlobMSBShort(image, psd_unit); /* width unit */
+  (void) WriteBlobMSBLong(image, yres_fix);
+  (void) WriteBlobMSBShort(image, psd_unit); /* vres unit */
+  (void) WriteBlobMSBShort(image, psd_unit); /* height unit */
+}
+
 static MagickBooleanType WritePSDImage(const ImageInfo *image_info,Image 
*image)
 {
   const char
@@ -1680,12 +1707,13 @@
     channelLength,
     layer_count,
     layer_info_size,
-    rounded_layer_info_size;
+    rounded_layer_info_size,
+    res_extra;
 
   Image
     * tmp_image = (Image *) NULL,
     * base_image = force_white_background ? image : GetNextImageInList(image);
-
+  
   /*
     Open output image file.
   */
@@ -1763,17 +1791,21 @@
   /*
     Image resource block.
   */
+  res_extra = 28; /* 0x03EB */
   profile=GetImageProfile(image,"8bim");
   if (profile == (StringInfo *) NULL)
-    (void) WriteBlobMSBLong(image,0);
+    WriteBlobMSBLong(image, res_extra);
   else
     {
-      (void) WriteBlobMSBLong(image,(unsigned long) GetStringInfoLength(
-        profile));
+      (void) WriteBlobMSBLong(image,(unsigned long) res_extra +
+        GetStringInfoLength(profile));
       (void) WriteBlob(image,GetStringInfoLength(profile),GetStringInfoDatum(
         profile));
     }
 
+  WriteResolutionInfo(image);
+       
+
 compute_layer_info:
   layer_count = 0;
   layer_info_size = 2;

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