X-Git-Url: http://git.imager.perl.org/imager.git/blobdiff_plain/1501d9b365a896effdcbf8825404d886b88d208c..a87997b2f901c06ea67e73d89558aa376f64019b:/imgdouble.c

diff --git a/imgdouble.c b/imgdouble.c
index d8e852f0..fdd33020 100644
--- a/imgdouble.c
+++ b/imgdouble.c
@@ -5,7 +5,7 @@ imgdouble.c - implements double per sample images
 
 =head1 SYNOPSIS
 
-  i_img *im = i_img_double_new(int x, int y, int channels);
+  i_img *im = i_img_double_new(width, height, channels);
   # use like a normal image
 
 =head1 DESCRIPTION
@@ -20,21 +20,26 @@ sample image type to work with.
 =cut
 */
 
-#include "image.h"
-#include "imagei.h"
-
-static int i_ppix_ddoub(i_img *im, int x, int y, i_color *val);
-static int i_gpix_ddoub(i_img *im, int x, int y, i_color *val);
-static int i_glin_ddoub(i_img *im, int l, int r, int y, i_color *vals);
-static int i_plin_ddoub(i_img *im, int l, int r, int y, i_color *vals);
-static int i_ppixf_ddoub(i_img *im, int x, int y, i_fcolor *val);
-static int i_gpixf_ddoub(i_img *im, int x, int y, i_fcolor *val);
-static int i_glinf_ddoub(i_img *im, int l, int r, int y, i_fcolor *vals);
-static int i_plinf_ddoub(i_img *im, int l, int r, int y, i_fcolor *vals);
-static int i_gsamp_ddoub(i_img *im, int l, int r, int y, i_sample_t *samps, 
+#define IMAGER_NO_CONTEXT
+#include "imager.h"
+#include "imageri.h"
+
+static int i_ppix_ddoub(i_img *im, i_img_dim x, i_img_dim y, const i_color *val);
+static int i_gpix_ddoub(i_img *im, i_img_dim x, i_img_dim y, i_color *val);
+static i_img_dim i_glin_ddoub(i_img *im, i_img_dim l, i_img_dim r, i_img_dim y, i_color *vals);
+static i_img_dim i_plin_ddoub(i_img *im, i_img_dim l, i_img_dim r, i_img_dim y, const i_color *vals);
+static int i_ppixf_ddoub(i_img *im, i_img_dim x, i_img_dim y, const i_fcolor *val);
+static int i_gpixf_ddoub(i_img *im, i_img_dim x, i_img_dim y, i_fcolor *val);
+static i_img_dim i_glinf_ddoub(i_img *im, i_img_dim l, i_img_dim r, i_img_dim y, i_fcolor *vals);
+static i_img_dim i_plinf_ddoub(i_img *im, i_img_dim l, i_img_dim r, i_img_dim y, const i_fcolor *vals);
+static i_img_dim i_gsamp_ddoub(i_img *im, i_img_dim l, i_img_dim r, i_img_dim y, i_sample_t *samps, 
                        int const *chans, int chan_count);
-static int i_gsampf_ddoub(i_img *im, int l, int r, int y, i_fsample_t *samps, 
+static i_img_dim i_gsampf_ddoub(i_img *im, i_img_dim l, i_img_dim r, i_img_dim y, i_fsample_t *samps, 
                         int const *chans, int chan_count);
+static i_img_dim 
+i_psamp_ddoub(i_img *im, i_img_dim l, i_img_dim r, i_img_dim y, const i_sample_t *samps, const int *chans, int chan_count);
+static i_img_dim 
+i_psampf_ddoub(i_img *im, i_img_dim l, i_img_dim r, i_img_dim y, const i_fsample_t *samps, const int *chans, int chan_count);
 
 /*
 =item IIM_base_16bit_direct
@@ -70,87 +75,98 @@ static i_img IIM_base_double_direct =
 
   NULL, /* i_f_gpal */
   NULL, /* i_f_ppal */
-  NULL, /* i_f_addcolor */
-  NULL, /* i_f_getcolor */
+  NULL, /* i_f_addcolors */
+  NULL, /* i_f_getcolors */
   NULL, /* i_f_colorcount */
+  NULL, /* i_f_maxcolors */
   NULL, /* i_f_findcolor */
+  NULL, /* i_f_setcolors */
 
   NULL, /* i_f_destroy */
+
+  i_gsamp_bits_fb,
+  NULL, /* i_f_psamp_bits */
+
+  i_psamp_ddoub, /* i_f_psamp */
+  i_psampf_ddoub /* i_f_psampf */
 };
 
 /*
-=item i_img_double_new(int x, int y, int ch)
+=item im_img_double_new(ctx, x, y, ch)
+X<im_img_double_new API>X<i_img_double_new API>
+=category Image creation/destruction
+=synopsis i_img *img = im_img_double_new(aIMCTX, width, height, channels);
+=synopsis i_img *img = i_img_double_new(width, height, channels);
 
 Creates a new double per sample image.
 
+Also callable as C<i_img_double_new(width, height, channels)>.
+
 =cut
 */
-i_img *i_img_double_new_low(i_img *im, int x, int y, int ch) {
-  mm_log((1,"i_img_double_new(x %d, y %d, ch %d)\n", x, y, ch));
+i_img *
+im_img_double_new(pIMCTX, i_img_dim x, i_img_dim y, int ch) {
+  size_t bytes;
+  i_img *im;
+
+  im_log((aIMCTX, 1,"i_img_double_new(x %" i_DF ", y %" i_DF ", ch %d)\n",
+	  i_DFc(x), i_DFc(y), ch));
 
   if (x < 1 || y < 1) {
-    i_push_error(0, "Image sizes must be positive");
+    im_push_error(aIMCTX, 0, "Image sizes must be positive");
     return NULL;
   }
   if (ch < 1 || ch > MAXCHANNELS) {
-    i_push_errorf(0, "channels must be between 1 and %d", MAXCHANNELS);
+    im_push_errorf(aIMCTX, 0, "channels must be between 1 and %d", MAXCHANNELS);
+    return NULL;
+  }
+  bytes = x * y * ch * sizeof(double);
+  if (bytes / y / ch / sizeof(double) != x) {
+    im_push_errorf(aIMCTX, 0, "integer overflow calculating image allocation");
     return NULL;
   }
   
+  im = im_img_alloc(aIMCTX);
   *im = IIM_base_double_direct;
   i_tags_new(&im->tags);
   im->xsize = x;
   im->ysize = y;
   im->channels = ch;
-  im->bytes = x * y * ch * sizeof(double);
+  im->bytes = bytes;
   im->ext_data = NULL;
   im->idata = mymalloc(im->bytes);
-  if (im->idata) {
-    memset(im->idata, 0, im->bytes);
-  }
-  else {
-    i_tags_destroy(&im->tags);
-    im = NULL;
-  }
-  
-  return im;
-}
-
-i_img *i_img_double_new(int x, int y, int ch) {
-  i_img *im;
-
-  i_clear_error();
-
-  im = mymalloc(sizeof(i_img));
-  if (im) {
-    if (!i_img_double_new_low(im, x, y, ch)) {
-      myfree(im);
-      im = NULL;
-    }
-  }
-  
-  mm_log((1, "(%p) <- i_img_double_new\n", im));
+  memset(im->idata, 0, im->bytes);
+  im_img_init(aIMCTX, im);
   
   return im;
 }
 
-static int i_ppix_ddoub(i_img *im, int x, int y, i_color *val) {
-  int off, ch;
+static int i_ppix_ddoub(i_img *im, i_img_dim x, i_img_dim y, const i_color *val) {
+  i_img_dim off;
+  int ch;
 
-  if (x < 0 || x >= im->xsize || y < 0 || y > im->ysize) 
+  if (x < 0 || x >= im->xsize || y < 0 || y >= im->ysize) 
     return -1;
 
   off = (x + y * im->xsize) * im->channels;
-  for (ch = 0; ch < im->channels; ++ch)
-    ((double*)im->idata)[off+ch] = Sample8ToF(val->channel[ch]);
+  if (I_ALL_CHANNELS_WRITABLE(im)) {
+    for (ch = 0; ch < im->channels; ++ch)
+      ((double*)im->idata)[off+ch] = Sample8ToF(val->channel[ch]);
+  }
+  else {
+    for (ch = 0; ch < im->channels; ++ch)
+      if (im->ch_mask & (1<<ch))
+	((double*)im->idata)[off+ch] = Sample8ToF(val->channel[ch]);
+  }
 
   return 0;
 }
 
-static int i_gpix_ddoub(i_img *im, int x, int y, i_color *val) {
-  int off, ch;
+static int i_gpix_ddoub(i_img *im, i_img_dim x, i_img_dim y, i_color *val) {
+  i_img_dim off;
+  int ch;
 
-  if (x < 0 || x >= im->xsize || y < 0 || y > im->ysize) 
+  if (x < 0 || x >= im->xsize || y < 0 || y >= im->ysize) 
     return -1;
 
   off = (x + y * im->xsize) * im->channels;
@@ -160,23 +176,32 @@ static int i_gpix_ddoub(i_img *im, int x, int y, i_color *val) {
   return 0;
 }
 
-static int i_ppixf_ddoub(i_img *im, int x, int y, i_fcolor *val) {
-  int off, ch;
+static int i_ppixf_ddoub(i_img *im, i_img_dim x, i_img_dim y, const i_fcolor *val) {
+  i_img_dim off;
+  int ch;
 
-  if (x < 0 || x >= im->xsize || y < 0 || y > im->ysize) 
+  if (x < 0 || x >= im->xsize || y < 0 || y >= im->ysize) 
     return -1;
 
   off = (x + y * im->xsize) * im->channels;
-  for (ch = 0; ch < im->channels; ++ch)
-    ((double *)im->idata)[off+ch] = val->channel[ch];;
+  if (I_ALL_CHANNELS_WRITABLE(im)) {
+    for (ch = 0; ch < im->channels; ++ch)
+      ((double *)im->idata)[off+ch] = val->channel[ch];
+  }
+  else {
+    for (ch = 0; ch < im->channels; ++ch)
+      if (im->ch_mask & (1 << ch))
+	((double *)im->idata)[off+ch] = val->channel[ch];
+  }
 
   return 0;
 }
 
-static int i_gpixf_ddoub(i_img *im, int x, int y, i_fcolor *val) {
-  int off, ch;
+static int i_gpixf_ddoub(i_img *im, i_img_dim x, i_img_dim y, i_fcolor *val) {
+  i_img_dim off;
+  int ch;
 
-  if (x < 0 || x >= im->xsize || y < 0 || y > im->ysize) 
+  if (x < 0 || x >= im->xsize || y < 0 || y >= im->ysize) 
     return -1;
 
   off = (x + y * im->xsize) * im->channels;
@@ -186,9 +211,10 @@ static int i_gpixf_ddoub(i_img *im, int x, int y, i_fcolor *val) {
   return 0;
 }
 
-static int i_glin_ddoub(i_img *im, int l, int r, int y, i_color *vals) {
-  int ch, count, i;
-  int off;
+static i_img_dim i_glin_ddoub(i_img *im, i_img_dim l, i_img_dim r, i_img_dim y, i_color *vals) {
+  int ch;
+  i_img_dim count, i;
+  i_img_dim off;
   if (y >=0 && y < im->ysize && l < im->xsize && l >= 0) {
     if (r > im->xsize)
       r = im->xsize;
@@ -207,18 +233,30 @@ static int i_glin_ddoub(i_img *im, int l, int r, int y, i_color *vals) {
   }
 }
 
-static int i_plin_ddoub(i_img *im, int l, int r, int y, i_color *vals) {
-  int ch, count, i;
-  int off;
+static i_img_dim i_plin_ddoub(i_img *im, i_img_dim l, i_img_dim r, i_img_dim y, const i_color *vals) {
+  int ch;
+  i_img_dim count, i;
+  i_img_dim off;
   if (y >=0 && y < im->ysize && l < im->xsize && l >= 0) {
     if (r > im->xsize)
       r = im->xsize;
     off = (l+y*im->xsize) * im->channels;
     count = r - l;
-    for (i = 0; i < count; ++i) {
-      for (ch = 0; ch < im->channels; ++ch) {
-        ((double *)im->idata)[off] = Sample8ToF(vals[i].channel[ch]);
-        ++off;
+    if (I_ALL_CHANNELS_WRITABLE(im)) {
+      for (i = 0; i < count; ++i) {
+	for (ch = 0; ch < im->channels; ++ch) {
+	  ((double *)im->idata)[off] = Sample8ToF(vals[i].channel[ch]);
+	  ++off;
+	}
+      }
+    }
+    else {
+      for (i = 0; i < count; ++i) {
+	for (ch = 0; ch < im->channels; ++ch) {
+	  if (im->ch_mask & (1 << ch))
+	    ((double *)im->idata)[off] = Sample8ToF(vals[i].channel[ch]);
+	  ++off;
+	}
       }
     }
     return count;
@@ -228,9 +266,10 @@ static int i_plin_ddoub(i_img *im, int l, int r, int y, i_color *vals) {
   }
 }
 
-static int i_glinf_ddoub(i_img *im, int l, int r, int y, i_fcolor *vals) {
-  int ch, count, i;
-  int off;
+static i_img_dim i_glinf_ddoub(i_img *im, i_img_dim l, i_img_dim r, i_img_dim y, i_fcolor *vals) {
+  int ch;
+  i_img_dim count, i;
+  i_img_dim off;
   if (y >=0 && y < im->ysize && l < im->xsize && l >= 0) {
     if (r > im->xsize)
       r = im->xsize;
@@ -249,18 +288,30 @@ static int i_glinf_ddoub(i_img *im, int l, int r, int y, i_fcolor *vals) {
   }
 }
 
-static int i_plinf_ddoub(i_img *im, int l, int r, int y, i_fcolor *vals) {
-  int ch, count, i;
-  int off;
+static i_img_dim i_plinf_ddoub(i_img *im, i_img_dim l, i_img_dim r, i_img_dim y, const i_fcolor *vals) {
+  int ch;
+  i_img_dim count, i;
+  i_img_dim off;
   if (y >=0 && y < im->ysize && l < im->xsize && l >= 0) {
     if (r > im->xsize)
       r = im->xsize;
     off = (l+y*im->xsize) * im->channels;
     count = r - l;
-    for (i = 0; i < count; ++i) {
-      for (ch = 0; ch < im->channels; ++ch) {
-        ((double *)im->idata)[off] = vals[i].channel[ch];
-        ++off;
+    if (I_ALL_CHANNELS_WRITABLE(im)) {
+      for (i = 0; i < count; ++i) {
+	for (ch = 0; ch < im->channels; ++ch) {
+	  ((double *)im->idata)[off] = vals[i].channel[ch];
+	  ++off;
+	}
+      }
+    }
+    else {
+      for (i = 0; i < count; ++i) {
+	for (ch = 0; ch < im->channels; ++ch) {
+	  if (im->ch_mask & (1 << ch))
+	    ((double *)im->idata)[off] = vals[i].channel[ch];
+	  ++off;
+	}
       }
     }
     return count;
@@ -270,10 +321,11 @@ static int i_plinf_ddoub(i_img *im, int l, int r, int y, i_fcolor *vals) {
   }
 }
 
-static int i_gsamp_ddoub(i_img *im, int l, int r, int y, i_sample_t *samps, 
+static i_img_dim i_gsamp_ddoub(i_img *im, i_img_dim l, i_img_dim r, i_img_dim y, i_sample_t *samps, 
                        int const *chans, int chan_count) {
-  int ch, count, i, w;
-  int off;
+  int ch;
+  i_img_dim count, i, w;
+  i_img_dim off;
 
   if (y >=0 && y < im->ysize && l < im->xsize && l >= 0) {
     if (r > im->xsize)
@@ -286,7 +338,8 @@ static int i_gsamp_ddoub(i_img *im, int l, int r, int y, i_sample_t *samps,
       /* make sure we have good channel numbers */
       for (ch = 0; ch < chan_count; ++ch) {
         if (chans[ch] < 0 || chans[ch] >= im->channels) {
-          i_push_errorf(0, "No channel %d in this image", chans[ch]);
+	  dIMCTXim(im);
+          im_push_errorf(aIMCTX, 0, "No channel %d in this image", chans[ch]);
           return 0;
         }
       }
@@ -299,6 +352,12 @@ static int i_gsamp_ddoub(i_img *im, int l, int r, int y, i_sample_t *samps,
       }
     }
     else {
+      if (chan_count <= 0 || chan_count > im->channels) {
+	dIMCTXim(im);
+	im_push_errorf(aIMCTX, 0, "chan_count %d out of range, must be >0, <= channels", 
+		      chan_count);
+	return 0;
+      }
       for (i = 0; i < w; ++i) {
         for (ch = 0; ch < chan_count; ++ch) {
           *samps++ = SampleFTo8(((double *)im->idata)[off+ch]);
@@ -315,10 +374,11 @@ static int i_gsamp_ddoub(i_img *im, int l, int r, int y, i_sample_t *samps,
   }
 }
 
-static int i_gsampf_ddoub(i_img *im, int l, int r, int y, i_fsample_t *samps, 
+static i_img_dim i_gsampf_ddoub(i_img *im, i_img_dim l, i_img_dim r, i_img_dim y, i_fsample_t *samps, 
                         int const *chans, int chan_count) {
-  int ch, count, i, w;
-  int off;
+  int ch;
+  i_img_dim count, i, w;
+  i_img_dim off;
 
   if (y >=0 && y < im->ysize && l < im->xsize && l >= 0) {
     if (r > im->xsize)
@@ -331,7 +391,8 @@ static int i_gsampf_ddoub(i_img *im, int l, int r, int y, i_fsample_t *samps,
       /* make sure we have good channel numbers */
       for (ch = 0; ch < chan_count; ++ch) {
         if (chans[ch] < 0 || chans[ch] >= im->channels) {
-          i_push_errorf(0, "No channel %d in this image", chans[ch]);
+	  dIMCTXim(im);
+          im_push_errorf(aIMCTX, 0, "No channel %d in this image", chans[ch]);
           return 0;
         }
       }
@@ -344,6 +405,12 @@ static int i_gsampf_ddoub(i_img *im, int l, int r, int y, i_fsample_t *samps,
       }
     }
     else {
+      if (chan_count <= 0 || chan_count > im->channels) {
+	dIMCTXim(im);
+	im_push_errorf(aIMCTX, 0, "chan_count %d out of range, must be >0, <= channels", 
+		      chan_count);
+	return 0;
+      }
       for (i = 0; i < w; ++i) {
         for (ch = 0; ch < chan_count; ++ch) {
           *samps++ = ((double *)im->idata)[off+ch];
@@ -360,6 +427,226 @@ static int i_gsampf_ddoub(i_img *im, int l, int r, int y, i_fsample_t *samps,
   }
 }
 
+/*
+=item i_psamp_ddoub(i_img *im, i_img_dim l, i_img_dim r, i_img_dim y, const i_sample_t *samps, int *chans, int chan_count)
+
+Writes sample values to im for the horizontal line (l, y) to (r-1,y)
+for the channels specified by chans, an array of int with chan_count
+elements.
+
+Returns the number of samples written (which should be (r-l) *
+bits_set(chan_mask)
+
+=cut
+*/
+
+static
+i_img_dim
+i_psamp_ddoub(i_img *im, i_img_dim l, i_img_dim r, i_img_dim y, 
+	  const i_sample_t *samps, const int *chans, int chan_count) {
+  int ch;
+  i_img_dim count, i, w;
+
+  if (y >=0 && y < im->ysize && l < im->xsize && l >= 0) {
+    i_img_dim offset;
+    if (r > im->xsize)
+      r = im->xsize;
+    offset = (l+y*im->xsize) * im->channels;
+    w = r - l;
+    count = 0;
+
+    if (chans) {
+      /* make sure we have good channel numbers */
+      /* and test if all channels specified are in the mask */
+      int all_in_mask = 1;
+      for (ch = 0; ch < chan_count; ++ch) {
+        if (chans[ch] < 0 || chans[ch] >= im->channels) {
+	  dIMCTXim(im);
+          im_push_errorf(aIMCTX, 0, "No channel %d in this image", chans[ch]);
+          return -1;
+        }
+	if (!((1 << chans[ch]) & im->ch_mask))
+	  all_in_mask = 0;
+      }
+      if (all_in_mask) {
+	for (i = 0; i < w; ++i) {
+	  for (ch = 0; ch < chan_count; ++ch) {
+	    ((double*)im->idata)[offset + chans[ch]] = Sample8ToF(*samps);
+	    ++samps;
+	    ++count;
+	  }
+	  offset += im->channels;
+	}
+      }
+      else {
+	for (i = 0; i < w; ++i) {
+	  for (ch = 0; ch < chan_count; ++ch) {
+	    if (im->ch_mask & (1 << (chans[ch])))
+	      ((double*)im->idata)[offset + chans[ch]] = Sample8ToF(*samps);
+	    
+	    ++samps;
+	    ++count;
+	  }
+	  offset += im->channels;
+	}
+      }
+    }
+    else {
+      if (chan_count <= 0 || chan_count > im->channels) {
+	dIMCTXim(im);
+	im_push_errorf(aIMCTX, 0, "chan_count %d out of range, must be >0, <= channels", 
+		      chan_count);
+	return -1;
+      }
+      for (i = 0; i < w; ++i) {
+	unsigned mask = 1;
+        for (ch = 0; ch < chan_count; ++ch) {
+	  if (im->ch_mask & mask)
+	    ((double*)im->idata)[offset + ch] = Sample8ToF(*samps);
+
+	  ++samps;
+          ++count;
+	  mask <<= 1;
+        }
+        offset += im->channels;
+      }
+    }
+
+    return count;
+  }
+  else {
+    dIMCTXim(im);
+    i_push_error(0, "Image position outside of image");
+    return -1;
+  }
+}
+
+/*
+=item i_psampf_ddoub(i_img *im, i_img_dim l, i_img_dim r, i_img_dim y, const i_fsample_t *samps, int *chans, int chan_count)
+
+Writes sample values to im for the horizontal line (l, y) to (r-1,y)
+for the channels specified by chans, an array of int with chan_count
+elements.
+
+Returns the number of samples written (which should be (r-l) *
+bits_set(chan_mask)
+
+=cut
+*/
+
+static
+i_img_dim
+i_psampf_ddoub(i_img *im, i_img_dim l, i_img_dim r, i_img_dim y, 
+	       const i_fsample_t *samps, const int *chans, int chan_count) {
+  int ch;
+  i_img_dim count, i, w;
+
+  if (y >=0 && y < im->ysize && l < im->xsize && l >= 0) {
+    i_img_dim offset;
+    if (r > im->xsize)
+      r = im->xsize;
+    offset = (l+y*im->xsize) * im->channels;
+    w = r - l;
+    count = 0;
+
+    if (chans) {
+      /* make sure we have good channel numbers */
+      /* and test if all channels specified are in the mask */
+      int all_in_mask = 1;
+      for (ch = 0; ch < chan_count; ++ch) {
+        if (chans[ch] < 0 || chans[ch] >= im->channels) {
+	  dIMCTXim(im);
+          im_push_errorf(aIMCTX, 0, "No channel %d in this image", chans[ch]);
+          return -1;
+        }
+	if (!((1 << chans[ch]) & im->ch_mask))
+	  all_in_mask = 0;
+      }
+      if (all_in_mask) {
+	for (i = 0; i < w; ++i) {
+	  for (ch = 0; ch < chan_count; ++ch) {
+	    ((double*)im->idata)[offset + chans[ch]] = *samps;
+	    ++samps;
+	    ++count;
+	  }
+	  offset += im->channels;
+	}
+      }
+      else {
+	for (i = 0; i < w; ++i) {
+	  for (ch = 0; ch < chan_count; ++ch) {
+	    if (im->ch_mask & (1 << (chans[ch])))
+	      ((double*)im->idata)[offset + chans[ch]] = *samps;
+	    
+	    ++samps;
+	    ++count;
+	  }
+	  offset += im->channels;
+	}
+      }
+    }
+    else {
+      if (chan_count <= 0 || chan_count > im->channels) {
+	dIMCTXim(im);
+	im_push_errorf(aIMCTX, 0, "chan_count %d out of range, must be >0, <= channels", 
+		      chan_count);
+	return -1;
+      }
+      for (i = 0; i < w; ++i) {
+	unsigned mask = 1;
+        for (ch = 0; ch < chan_count; ++ch) {
+	  if (im->ch_mask & mask)
+	    ((double*)im->idata)[offset + ch] = *samps;
+
+	  ++samps;
+          ++count;
+	  mask <<= 1;
+        }
+        offset += im->channels;
+      }
+    }
+
+    return count;
+  }
+  else {
+    dIMCTXim(im);
+    i_push_error(0, "Image position outside of image");
+    return -1;
+  }
+}
+
+/*
+=item i_img_to_drgb(im)
+
+=category Image creation
+
+Returns a double/sample version of the supplied image.
+
+Returns the image on success, or NULL on failure.
+
+=cut
+*/
+
+i_img *
+i_img_to_drgb(i_img *im) {
+  i_img *targ;
+  i_fcolor *line;
+  i_img_dim y;
+  dIMCTXim(im);
+
+  targ = im_img_double_new(aIMCTX, im->xsize, im->ysize, im->channels);
+  if (!targ)
+    return NULL;
+  line = mymalloc(sizeof(i_fcolor) * im->xsize);
+  for (y = 0; y < im->ysize; ++y) {
+    i_glinf(im, 0, im->xsize, y, line);
+    i_plinf(targ, 0, im->xsize, y, line);
+  }
+
+  myfree(line);
+
+  return targ;
+}
 
 /*
 =back