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use Alpha channel and selection channel info when available to build the

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2003-09-03  Pedro Gimeno  <pggimeno@wanadoo.es>

	* ccanalyze.c (analyze): use Alpha channel and selection
	channel info when available to build the histogram and to
	include/exclude colors in the color count. Fixes bug #121097
	and handling of INDEXEDA images which was broken.
	(histogram, insertcolor, fillPreview): updated to use
	gdoubles where appropriate.
This commit is contained in:
Pedro Gimeno
2003-09-03 19:22:49 +00:00
committed by Pedro Gimeno Fortea
parent 41edbeb907
commit 48b06a23ee
2 changed files with 99 additions and 45 deletions
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9
ChangeLog
View File

@ -1,3 +1,12 @@
2003-09-03 Pedro Gimeno <pggimeno@wanadoo.es>
* ccanalyze.c (analyze): use Alpha channel and selection
channel info when available to build the histogram and to
include/exclude colors in the color count. Fixes bug #121097
and handling of INDEXEDA images which was broken.
(histogram, insertcolor, fillPreview): updated to use
gdoubles where appropriate.
2003-09-03 Pedro Gimeno <pggimeno@wanadoo.es>
* ccanalyze.c: Changed from CR/LF style to LF style in preparation

109
plug-ins/common/ccanalyze.c
View File

@ -111,7 +111,7 @@ struct _ColorNode
guchar g;
guchar b;
gint count;
gdouble count;
};
@ -128,11 +128,13 @@ static void analyze (GimpDrawable *drawable);
static void histogram (guchar r,
guchar g,
guchar b);
guchar b,
gdouble a);
static void fillPreview (GtkWidget *preview);
static void insertcolor (guchar r,
guchar g,
guchar b);
guchar b,
gdouble a);
static void doLabel (GtkWidget *table,
const char *format,
@ -142,8 +144,8 @@ static void doLabel (GtkWidget *table,
static gchar *filename = NULL;
static gint width, height, bpp;
static ColorNode *color_table = NULL;
static gint32 hist_red[256], hist_green[256], hist_blue[256];
static gint maxred = 0, maxgreen = 0, maxblue = 0;
static gdouble hist_red[256], hist_green[256], hist_blue[256];
static gdouble maxred = 0.0, maxgreen = 0.0, maxblue = 0.0;
static gint uniques = 0;
static gint32 imageID;
@ -263,8 +265,14 @@ analyze (GimpDrawable *drawable)
gint x, y, numcol;
gint x1, y1, x2, y2;
guchar r, g, b;
gint a;
guchar idx;
gboolean gray;
gboolean has_alpha;
gboolean has_sel;
guchar *sel;
GimpPixelRgn selPR;
gint ofsx, ofsy;
gimp_progress_init (_("Colorcube Analysis..."));
@ -285,69 +293,101 @@ analyze (GimpDrawable *drawable)
height = drawable->height;
bpp = drawable->bpp;
/* allocate row buffer */
src_row = g_malloc ((x2 - x1) * bpp);
if (x2 <= x1 || y2 <= y1)
return;
has_sel = !gimp_selection_is_empty (imageID);
gimp_drawable_offsets (drawable->drawable_id, &ofsx, &ofsy);
/* initialize the pixel region */
gimp_pixel_rgn_init (&srcPR, drawable, 0, 0, width, height, FALSE, FALSE);
cmap = gimp_image_get_cmap (imageID, &numcol);
gray = gimp_drawable_is_gray (drawable->drawable_id);
gray = (gimp_drawable_is_gray (drawable->drawable_id)
|| gimp_drawable_is_channel (drawable->drawable_id));
has_alpha = gimp_drawable_has_alpha (drawable->drawable_id);
gimp_pixel_rgn_init (&selPR,
gimp_drawable_get (gimp_image_get_selection (imageID)),
0, 0, width, height, FALSE, FALSE);
/* allocate row buffer */
src_row = g_malloc ((x2 - x1) * bpp);
sel = g_malloc (x2 - x1);
for (y = y1; y < y2; y++)
{
gimp_pixel_rgn_get_row (&srcPR, src_row, x1, y, (x2 - x1));
if (has_sel)
gimp_pixel_rgn_get_row (&selPR, sel, x1 + ofsx, y + ofsy, (x2 - x1));
for (x = 0; x < x2 - x1; x++)
{
/* Start with full opacity. */
a = 255;
/*
* If the image is indexed, fetch RGB values
* from colormap.
*/
if (cmap)
{
idx = src_row[x];
idx = src_row[x * bpp];
r = cmap[idx * 3];
g = cmap[idx * 3 + 1];
b = cmap[idx * 3 + 2];
if (has_alpha)
a = src_row[x * bpp + 1];
}
else if (gray)
{
r = g = b = src_row[x * bpp];
if (has_alpha)
a = src_row[x * bpp + 1];
}
else
{
r = src_row[x * bpp];
g = src_row[x * bpp + 1];
b = src_row[x * bpp + 2];
if (has_alpha)
a = src_row[x * bpp + 3];
}
insertcolor (r, g, b);
if (has_sel)
a *= sel[x];
else
a *= 255;
if (a != 0)
insertcolor (r, g, b, (gdouble) a * (1.0 / (255.0 * 255.0)));
}
/* tell the user what we're doing */
if ((y % 10) == 0)
gimp_progress_update ((double) y / (double) (y2 - y1));
gimp_progress_update ((gdouble) y / (gdouble) (y2 - y1));
}
/* clean up */
g_free (src_row);
g_free (sel);
}
/* here's were we actually store our color-table */
/* here's where we actually store our color-table */
static void
insertcolor (guchar r,
guchar g,
guchar b)
guchar b,
gdouble a)
{
ColorNode *node, *next = NULL, *prev = NULL,
*newred, *newgreen = NULL, *newblue;
ColorType type = RED;
histogram (r, g, b);
histogram (r, g, b, a);
/* lets walk the tree, and see if it already contains this color */
/* let's walk the tree, and see if it already contains this color */
for (node = color_table; node != NULL; prev = node, node = next)
{
if (node->color == RED)
@ -389,10 +429,10 @@ insertcolor (guchar r,
}
}
/* this color was already stored -> update it's count */
/* this color was already stored -> update its count */
if (node)
{
node->count++;
node->count += a;
return;
}
@ -414,7 +454,7 @@ insertcolor (guchar r,
newblue->r = r;
newblue->g = g;
newblue->b = b;
newblue->count = 1;
newblue->count = a;
/* previous was green: create link to axis */
if (prev && prev->color == GREEN && type == BLUE)
@ -436,7 +476,7 @@ insertcolor (guchar r,
newgreen->g = g;
/* count doesn't matter here */
newgreen->count = -1;
/*newgreen->count = -1;*/
/* previous was red: create link to axis */
if (prev && prev->color == RED && type == GREEN)
@ -459,7 +499,7 @@ insertcolor (guchar r,
newred->r = r;
/* count doesn't matter here */
newred->count = -1;
/*newred->count = -1;*/
/* previous was red, update its neighbour link */
if (prev)
@ -479,15 +519,20 @@ insertcolor (guchar r,
static void
histogram (guchar r,
guchar g,
guchar b)
guchar b,
gdouble a)
{
if (++hist_red[r] > maxred)
hist_red[r] += a;
hist_green[g] += a;
hist_blue[b] += a;
if (hist_red[r] > maxred)
maxred = hist_red[r];
if (++hist_green[g] > maxgreen)
if (hist_green[g] > maxgreen)
maxgreen = hist_green[g];
if (++hist_blue[b] > maxblue)
if (hist_blue[b] > maxblue)
maxblue = hist_blue[b];
}
@ -563,7 +608,7 @@ doDialog (void)
doLabel (table, _("Compressed size in bytes: %u"), filesize);
doLabel (table, _("Compression ratio (approx.): %d to 1"),
(gint) RINT ((double) (width * height * bpp) / filesize));
(gint) RINT ((gdouble) (width * height * bpp) / filesize));
}
/* show stuff */
@ -607,7 +652,7 @@ fillPreview (GtkWidget *preview)
{
guchar *image, *pimage, *pixel;
gint x, y, rowstride;
gint histcount, val;
gdouble histcount, val;
image = g_malloc0 (PREWIDTH * PREHEIGHT * 3);
@ -620,9 +665,9 @@ fillPreview (GtkWidget *preview)
* and build a one-pixel bar.
* ... in the respective channel, preserving the other ones. --hb
*/
histcount = hist_red[x] ? hist_red[x] : 1;
histcount = hist_red[x] > 1.0 ? hist_red[x] : 1.0;
val = (gint) (log ((gdouble) histcount) * (PREHEIGHT / 12));
val = log (histcount) * (PREHEIGHT / 12);
if (val > PREHEIGHT)
val = PREHEIGHT;
@ -633,9 +678,9 @@ fillPreview (GtkWidget *preview)
*pixel = 255;
}
histcount = hist_green[x] ? hist_green[x] : 1;
histcount = hist_green[x] > 1.0 ? hist_green[x] : 1.0;
val = (gint) (log ((gdouble) histcount) * (PREHEIGHT / 12));
val = log (histcount) * (PREHEIGHT / 12);
if (val > PREHEIGHT)
val = PREHEIGHT;
@ -646,9 +691,9 @@ fillPreview (GtkWidget *preview)
*(pixel + 1) = 255;
}
histcount = hist_blue[x] ? hist_blue[x] : 1;
histcount = hist_blue[x] > 1.0 ? hist_blue[x] : 1.0;
val = (gint) (log ((gdouble) histcount) * (PREHEIGHT / 12));
val = log (histcount) * (PREHEIGHT / 12);
if (val > PREHEIGHT)
val = PREHEIGHT;