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use bpl (line pitch) when iterating over the buffer. Added a simple color 

2003-01-23  Sven Neumann  <sven@gimp.org>

	* modules/cdisplay_colorblind.c: use bpl (line pitch) when
	iterating over the buffer. Added a simple color cache that speeds
	up the filter for images that only use a few colors.
This commit is contained in:
Sven Neumann 2003-01-23 18:28:30 +00:00 committed by Sven Neumann
parent de3e7a2ab7
commit 90e82d404e
2 changed files with 106 additions and 76 deletions
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6
ChangeLog
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@ -1,3 +1,9 @@
2003-01-23 Sven Neumann <sven@gimp.org>
* modules/cdisplay_colorblind.c: use bpl (line pitch) when
iterating over the buffer. Added a simple color cache that speeds
up the filter for images that only use a few colors.
2003-01-23 Sven Neumann <sven@gimp.org>
* modules/cdisplay_colorblind.c: moved some intialisation code out

176
modules/cdisplay_colorblind.c
View File

@ -2,7 +2,8 @@
* Copyright (C) 1995-1997 Spencer Kimball and Peter Mattis
*
* cdisplay_colorblind.c
* Copyright (C) 2002-2003 Michael Natterer <mitch@gimp.org>,
* Copyright (C) 2002-2003 Michael Natterer <mitch@gimp.org>,
* Sven Neumann <sven@gimp.org>,
* Robert Dougherty <bob@vischeck.com> and
* Alex Wade <alex@vischeck.com>
*
@ -50,7 +51,8 @@ typedef enum
} ColorblindDeficiency;
#define DEFAULT_DEFICIENCY COLORBLIND_DEFICIENCY_DEUTERANOPIA
#define DEFAULT_DEFICIENCY COLORBLIND_DEFICIENCY_DEUTERANOPIA
#define COLOR_CACHE_SIZE 1021
#define CDISPLAY_TYPE_COLORBLIND (cdisplay_colorblind_type)
@ -77,6 +79,8 @@ struct _CdisplayColorblind
gfloat a2, b2, c2;
gfloat inflection;
guint32 cache[2 * COLOR_CACHE_SIZE];
GtkWidget *hbox;
GtkWidget *optionmenu;
};
@ -291,7 +295,7 @@ cdisplay_colorblind_convert (GimpColorDisplay *display,
gfloat a1, b1, c1, a2, b2, c2;
gfloat tmp;
gfloat red, green, blue, redOld, greenOld;
gint npix;
gint x, y;
/* Require 3 bytes per pixel (assume RGB) */
if (bpp != 3)
@ -308,88 +312,105 @@ cdisplay_colorblind_convert (GimpColorDisplay *display,
a1 = colorblind->a1; b1 = colorblind->b1; c1 = colorblind->c1;
a2 = colorblind->a2; b2 = colorblind->b2; c2 = colorblind->c2;
npix = height * width; /* number of pixels in the image */
b = buf; /* pointer to the RGB color buffer */
for (y = 0; y < height; y++, buf += bpl)
for (x = 0, b = buf; x < width; x++, b += bpp)
{
guint32 pixel;
guint index;
while (npix--)
{
red = b[0];
green = b[1];
blue = b[2];
/* First check our cache */
pixel = b[0] << 16 | b[1] << 8 | b[2];
index = pixel % COLOR_CACHE_SIZE;
/* Remove gamma to linearize RGB intensities */
red = pow (red, 1.0 / colorblind->gammaRGB[0]);
green = pow (green, 1.0 / colorblind->gammaRGB[1]);
blue = pow (blue, 1.0 / colorblind->gammaRGB[2]);
if (colorblind->cache[2 * index] == pixel)
{
pixel = colorblind->cache[2 * index + 1];
b[2] = pixel & 0xFF; pixel >>= 8;
b[1] = pixel & 0xFF; pixel >>= 8;
b[0] = pixel & 0xFF;
/* Convert to LMS (dot product with transform matrix) */
redOld = red;
greenOld = green;
continue;
}
red = redOld * rgb2lms[0] + greenOld * rgb2lms[1] + blue * rgb2lms[2];
green = redOld * rgb2lms[3] + greenOld * rgb2lms[4] + blue * rgb2lms[5];
blue = redOld * rgb2lms[6] + greenOld * rgb2lms[7] + blue * rgb2lms[8];
red = b[0];
green = b[1];
blue = b[2];
switch (colorblind->deficiency)
{
case COLORBLIND_DEFICIENCY_DEUTERANOPIA:
tmp = blue / red;
/* See which side of the inflection line we fall... */
if (tmp < colorblind->inflection)
/* Remove gamma to linearize RGB intensities */
red = pow (red, 1.0 / colorblind->gammaRGB[0]);
green = pow (green, 1.0 / colorblind->gammaRGB[1]);
blue = pow (blue, 1.0 / colorblind->gammaRGB[2]);
/* Convert to LMS (dot product with transform matrix) */
redOld = red;
greenOld = green;
red = redOld * rgb2lms[0] + greenOld * rgb2lms[1] + blue * rgb2lms[2];
green = redOld * rgb2lms[3] + greenOld * rgb2lms[4] + blue * rgb2lms[5];
blue = redOld * rgb2lms[6] + greenOld * rgb2lms[7] + blue * rgb2lms[8];
switch (colorblind->deficiency)
{
case COLORBLIND_DEFICIENCY_DEUTERANOPIA:
tmp = blue / red;
/* See which side of the inflection line we fall... */
if (tmp < colorblind->inflection)
green = -(a1 * red + c1 * blue) / b1;
else
green = -(a2 * red + c2 * blue) / b2;
break;
else
green = -(a2 * red + c2 * blue) / b2;
break;
case COLORBLIND_DEFICIENCY_PROTANOPIA:
tmp = blue / green;
/* See which side of the inflection line we fall... */
if (tmp < colorblind->inflection)
red = -(b1 * green + c1 * blue) / a1;
else
red = -(b2 * green + c2 * blue) / a2;
break;
case COLORBLIND_DEFICIENCY_PROTANOPIA:
tmp = blue / green;
/* See which side of the inflection line we fall... */
if (tmp < colorblind->inflection)
red = -(b1 * green + c1 * blue) / a1;
else
red = -(b2 * green + c2 * blue) / a2;
break;
case COLORBLIND_DEFICIENCY_TRITANOPIA:
tmp = green / red;
/* See which side of the inflection line we fall... */
if (tmp < colorblind->inflection)
blue = -(a1 * red + b1 * green) / c1;
else
blue = -(a2 * red + b2 * green) / c2;
break;
case COLORBLIND_DEFICIENCY_TRITANOPIA:
tmp = green / red;
/* See which side of the inflection line we fall... */
if (tmp < colorblind->inflection)
blue = -(a1 * red + b1 * green) / c1;
else
blue = -(a2 * red + b2 * green) / c2;
break;
default:
break;
}
default:
break;
}
/* Convert back to RGB (cross product with transform matrix) */
redOld = red;
greenOld = green;
red = redOld * lms2rgb[0] + greenOld * lms2rgb[1] + blue * lms2rgb[2];
green = redOld * lms2rgb[3] + greenOld * lms2rgb[4] + blue * lms2rgb[5];
blue = redOld * lms2rgb[6] + greenOld * lms2rgb[7] + blue * lms2rgb[8];
/* Apply gamma to go back to non-linear intensities */
red = pow (red, colorblind->gammaRGB[0]);
green = pow (green, colorblind->gammaRGB[1]);
blue = pow (blue, colorblind->gammaRGB[2]);
/* Ensure that we stay within the RGB gamut */
/* *** FIX THIS: it would be better to desaturate than blindly clip. */
red = CLAMP (red, 0, 255);
green = CLAMP (green, 0, 255);
blue = CLAMP (blue, 0, 255);
/* Stuff result back into buffer */
b[0] = (guchar) red;
b[1] = (guchar) green;
b[2] = (guchar) blue;
/* Increment b by the number of bytes per pixel. */
b += bpp;
}
/* Convert back to RGB (cross product with transform matrix) */
redOld = red;
greenOld = green;
red = redOld * lms2rgb[0] + greenOld * lms2rgb[1] + blue * lms2rgb[2];
green = redOld * lms2rgb[3] + greenOld * lms2rgb[4] + blue * lms2rgb[5];
blue = redOld * lms2rgb[6] + greenOld * lms2rgb[7] + blue * lms2rgb[8];
/* Apply gamma to go back to non-linear intensities */
red = pow (red, colorblind->gammaRGB[0]);
green = pow (green, colorblind->gammaRGB[1]);
blue = pow (blue, colorblind->gammaRGB[2]);
/* Ensure that we stay within the RGB gamut */
/* *** FIX THIS: it would be better to desaturate than blindly clip. */
red = CLAMP (red, 0, 255);
green = CLAMP (green, 0, 255);
blue = CLAMP (blue, 0, 255);
/* Stuff result back into buffer */
b[0] = (guchar) red;
b[1] = (guchar) green;
b[2] = (guchar) blue;
/* Put the result into our cache */
colorblind->cache[2 * index] = pixel;
colorblind->cache[2 * index + 1] = b[0] << 16 | b[1] << 8 | b[2];
}
}
static void
@ -576,6 +597,9 @@ cdisplay_colorblind_changed (GimpColorDisplay *display)
colorblind->inflection = (anchor_e[1] / anchor_e[0]);
break;
}
/* Invalidate the cache */
memset (colorblind->cache, 0, sizeof (colorblind->cache));
}
static void