mirror of https://github.com/GNOME/gimp.git
394 lines
12 KiB
C
394 lines
12 KiB
C
/* LIBGIMP - The GIMP Library
|
|
* Copyright (C) 1995-1997 Peter Mattis and Spencer Kimball
|
|
*
|
|
* This library is free software: you can redistribute it and/or
|
|
* modify it under the terms of the GNU Lesser General Public
|
|
* License as published by the Free Software Foundation; either
|
|
* version 3 of the License, or (at your option) any later version.
|
|
*
|
|
* This library is distributed in the hope that it will be useful,
|
|
* but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
|
|
* Library General Public License for more details.
|
|
*
|
|
* You should have received a copy of the GNU Lesser General Public
|
|
* License along with this library. If not, see
|
|
* <http://www.gnu.org/licenses/>.
|
|
*/
|
|
|
|
#include "config.h"
|
|
|
|
#include <glib-object.h>
|
|
|
|
#include "libgimpmath/gimpmath.h"
|
|
|
|
#include "gimpcolortypes.h"
|
|
|
|
#include "gimpadaptivesupersample.h"
|
|
#include "gimprgb.h"
|
|
|
|
|
|
/**
|
|
* SECTION: gimpadaptivesupersample
|
|
* @title: GimpAdaptiveSupersample
|
|
* @short_description: Functions to perform adaptive supersampling on
|
|
* an area.
|
|
*
|
|
* Functions to perform adaptive supersampling on an area.
|
|
**/
|
|
|
|
|
|
/*********************************************************************/
|
|
/* Sumpersampling code (Quartic) */
|
|
/* This code is *largely* based on the sources for POV-Ray 3.0. I am */
|
|
/* grateful to the POV-Team for such a great program and for making */
|
|
/* their sources available. All comments / bug reports / */
|
|
/* etc. regarding this code should be addressed to me, not to the */
|
|
/* POV-Ray team. Any bugs are my responsibility, not theirs. */
|
|
/*********************************************************************/
|
|
|
|
|
|
typedef struct _GimpSampleType GimpSampleType;
|
|
|
|
struct _GimpSampleType
|
|
{
|
|
guchar ready;
|
|
GimpRGB color;
|
|
};
|
|
|
|
|
|
static gulong
|
|
gimp_render_sub_pixel (gint max_depth,
|
|
gint depth,
|
|
GimpSampleType **block,
|
|
gint x,
|
|
gint y,
|
|
gint x1,
|
|
gint y1,
|
|
gint x3,
|
|
gint y3,
|
|
gdouble threshold,
|
|
gint sub_pixel_size,
|
|
GimpRGB *color,
|
|
GimpRenderFunc render_func,
|
|
gpointer render_data)
|
|
{
|
|
gint x2, y2; /* Coords of center sample */
|
|
gdouble dx1, dy1; /* Delta to upper left sample */
|
|
gdouble dx3, dy3; /* Delta to lower right sample */
|
|
GimpRGB c[4]; /* Sample colors */
|
|
gulong num_samples = 0;
|
|
gint cnt;
|
|
|
|
g_return_val_if_fail (render_func != NULL, 0);
|
|
|
|
/* Get offsets for corners */
|
|
|
|
dx1 = (gdouble) (x1 - sub_pixel_size / 2) / sub_pixel_size;
|
|
dx3 = (gdouble) (x3 - sub_pixel_size / 2) / sub_pixel_size;
|
|
|
|
dy1 = (gdouble) (y1 - sub_pixel_size / 2) / sub_pixel_size;
|
|
dy3 = (gdouble) (y3 - sub_pixel_size / 2) / sub_pixel_size;
|
|
|
|
/* Render upper left sample */
|
|
|
|
if (! block[y1][x1].ready)
|
|
{
|
|
num_samples++;
|
|
|
|
render_func (x + dx1, y + dy1, &c[0], render_data);
|
|
|
|
block[y1][x1].ready = TRUE;
|
|
block[y1][x1].color = c[0];
|
|
}
|
|
else
|
|
{
|
|
c[0] = block[y1][x1].color;
|
|
}
|
|
|
|
/* Render upper right sample */
|
|
|
|
if (! block[y1][x3].ready)
|
|
{
|
|
num_samples++;
|
|
|
|
render_func (x + dx3, y + dy1, &c[1], render_data);
|
|
|
|
block[y1][x3].ready = TRUE;
|
|
block[y1][x3].color = c[1];
|
|
}
|
|
else
|
|
{
|
|
c[1] = block[y1][x3].color;
|
|
}
|
|
|
|
/* Render lower left sample */
|
|
|
|
if (! block[y3][x1].ready)
|
|
{
|
|
num_samples++;
|
|
|
|
render_func (x + dx1, y + dy3, &c[2], render_data);
|
|
|
|
block[y3][x1].ready = TRUE;
|
|
block[y3][x1].color = c[2];
|
|
}
|
|
else
|
|
{
|
|
c[2] = block[y3][x1].color;
|
|
}
|
|
|
|
/* Render lower right sample */
|
|
|
|
if (! block[y3][x3].ready)
|
|
{
|
|
num_samples++;
|
|
|
|
render_func (x + dx3, y + dy3, &c[3], render_data);
|
|
|
|
block[y3][x3].ready = TRUE;
|
|
block[y3][x3].color = c[3];
|
|
}
|
|
else
|
|
{
|
|
c[3] = block[y3][x3].color;
|
|
}
|
|
|
|
/* Check for supersampling */
|
|
|
|
if (depth <= max_depth)
|
|
{
|
|
/* Check whether we have to supersample */
|
|
|
|
if ((gimp_rgba_distance (&c[0], &c[1]) >= threshold) ||
|
|
(gimp_rgba_distance (&c[0], &c[2]) >= threshold) ||
|
|
(gimp_rgba_distance (&c[0], &c[3]) >= threshold) ||
|
|
(gimp_rgba_distance (&c[1], &c[2]) >= threshold) ||
|
|
(gimp_rgba_distance (&c[1], &c[3]) >= threshold) ||
|
|
(gimp_rgba_distance (&c[2], &c[3]) >= threshold))
|
|
{
|
|
/* Calc coordinates of center subsample */
|
|
|
|
x2 = (x1 + x3) / 2;
|
|
y2 = (y1 + y3) / 2;
|
|
|
|
/* Render sub-blocks */
|
|
|
|
num_samples += gimp_render_sub_pixel (max_depth, depth + 1, block,
|
|
x, y, x1, y1, x2, y2,
|
|
threshold, sub_pixel_size,
|
|
&c[0],
|
|
render_func, render_data);
|
|
|
|
num_samples += gimp_render_sub_pixel (max_depth, depth + 1, block,
|
|
x, y, x2, y1, x3, y2,
|
|
threshold, sub_pixel_size,
|
|
&c[1],
|
|
render_func, render_data);
|
|
|
|
num_samples += gimp_render_sub_pixel (max_depth, depth + 1, block,
|
|
x, y, x1, y2, x2, y3,
|
|
threshold, sub_pixel_size,
|
|
&c[2],
|
|
render_func, render_data);
|
|
|
|
num_samples += gimp_render_sub_pixel (max_depth, depth + 1, block,
|
|
x, y, x2, y2, x3, y3,
|
|
threshold, sub_pixel_size,
|
|
&c[3],
|
|
render_func, render_data);
|
|
}
|
|
}
|
|
|
|
if (c[0].a == 0.0 || c[1].a == 0.0 || c[2].a == 0.0 || c[3].a == 0.0)
|
|
{
|
|
GimpRGB tmpcol;
|
|
gdouble weight;
|
|
|
|
gimp_rgb_set (&tmpcol, 0.0, 0.0, 0.0);
|
|
|
|
weight = 2.0;
|
|
|
|
for (cnt = 0; cnt < 4; cnt++)
|
|
{
|
|
if (c[cnt].a != 0.0)
|
|
{
|
|
tmpcol.r += c[cnt].r;
|
|
tmpcol.g += c[cnt].g;
|
|
tmpcol.b += c[cnt].b;
|
|
|
|
weight /= 2.0;
|
|
}
|
|
}
|
|
|
|
color->r = weight * tmpcol.r;
|
|
color->g = weight * tmpcol.g;
|
|
color->b = weight * tmpcol.b;
|
|
}
|
|
else
|
|
{
|
|
color->r = 0.25 * (c[0].r + c[1].r + c[2].r + c[3].r);
|
|
color->g = 0.25 * (c[0].g + c[1].g + c[2].g + c[3].g);
|
|
color->b = 0.25 * (c[0].b + c[1].b + c[2].b + c[3].b);
|
|
}
|
|
|
|
color->a = 0.25 * (c[0].a + c[1].a + c[2].a + c[3].a);
|
|
|
|
return num_samples;
|
|
}
|
|
|
|
gulong
|
|
gimp_adaptive_supersample_area (gint x1,
|
|
gint y1,
|
|
gint x2,
|
|
gint y2,
|
|
gint max_depth,
|
|
gdouble threshold,
|
|
GimpRenderFunc render_func,
|
|
gpointer render_data,
|
|
GimpPutPixelFunc put_pixel_func,
|
|
gpointer put_pixel_data,
|
|
GimpProgressFunc progress_func,
|
|
gpointer progress_data)
|
|
{
|
|
gint x, y, width; /* Counters, width of region */
|
|
gint xt, xtt, yt; /* Temporary counters */
|
|
gint sub_pixel_size; /* Number of samples per pixel (1D) */
|
|
GimpRGB color; /* Rendered pixel's color */
|
|
GimpSampleType tmp_sample; /* For swapping samples */
|
|
GimpSampleType *top_row, *bot_row, *tmp_row; /* Sample rows */
|
|
GimpSampleType **block; /* Sample block matrix */
|
|
gulong num_samples;
|
|
|
|
g_return_val_if_fail (render_func != NULL, 0);
|
|
g_return_val_if_fail (put_pixel_func != NULL, 0);
|
|
|
|
/* Initialize color */
|
|
|
|
gimp_rgba_set (&color, 0.0, 0.0, 0.0, 0.0);
|
|
|
|
/* Calculate sub-pixel size */
|
|
|
|
sub_pixel_size = 1 << max_depth;
|
|
|
|
/* Create row arrays */
|
|
|
|
width = x2 - x1 + 1;
|
|
|
|
top_row = g_new (GimpSampleType, sub_pixel_size * width + 1);
|
|
bot_row = g_new (GimpSampleType, sub_pixel_size * width + 1);
|
|
|
|
for (x = 0; x < (sub_pixel_size * width + 1); x++)
|
|
{
|
|
top_row[x].ready = FALSE;
|
|
|
|
gimp_rgba_set (&top_row[x].color, 0.0, 0.0, 0.0, 0.0);
|
|
|
|
bot_row[x].ready = FALSE;
|
|
|
|
gimp_rgba_set (&bot_row[x].color, 0.0, 0.0, 0.0, 0.0);
|
|
}
|
|
|
|
/* Allocate block matrix */
|
|
|
|
block = g_new (GimpSampleType *, sub_pixel_size + 1); /* Rows */
|
|
|
|
for (y = 0; y < (sub_pixel_size + 1); y++)
|
|
{
|
|
block[y] = g_new (GimpSampleType, sub_pixel_size + 1); /* Columns */
|
|
|
|
for (x = 0; x < (sub_pixel_size + 1); x++)
|
|
{
|
|
block[y][x].ready = FALSE;
|
|
|
|
gimp_rgba_set (&block[y][x].color, 0.0, 0.0, 0.0, 0.0);
|
|
}
|
|
}
|
|
|
|
/* Render region */
|
|
|
|
num_samples = 0;
|
|
|
|
for (y = y1; y <= y2; y++)
|
|
{
|
|
/* Clear the bottom row */
|
|
|
|
for (xt = 0; xt < (sub_pixel_size * width + 1); xt++)
|
|
bot_row[xt].ready = FALSE;
|
|
|
|
/* Clear first column */
|
|
|
|
for (yt = 0; yt < (sub_pixel_size + 1); yt++)
|
|
block[yt][0].ready = FALSE;
|
|
|
|
/* Render row */
|
|
|
|
for (x = x1; x <= x2; x++)
|
|
{
|
|
/* Initialize block by clearing all but first row/column */
|
|
|
|
for (yt = 1; yt < (sub_pixel_size + 1); yt++)
|
|
for (xt = 1; xt < (sub_pixel_size + 1); xt++)
|
|
block[yt][xt].ready = FALSE;
|
|
|
|
/* Copy samples from top row to block */
|
|
|
|
for (xtt = 0, xt = (x - x1) * sub_pixel_size;
|
|
xtt < (sub_pixel_size + 1);
|
|
xtt++, xt++)
|
|
block[0][xtt] = top_row[xt];
|
|
|
|
/* Render pixel on (x, y) */
|
|
|
|
num_samples += gimp_render_sub_pixel (max_depth, 1, block, x, y, 0, 0,
|
|
sub_pixel_size, sub_pixel_size,
|
|
threshold, sub_pixel_size,
|
|
&color,
|
|
render_func, render_data);
|
|
|
|
if (put_pixel_func)
|
|
(* put_pixel_func) (x, y, &color, put_pixel_data);
|
|
|
|
/* Copy block information to rows */
|
|
|
|
top_row[(x - x1 + 1) * sub_pixel_size] = block[0][sub_pixel_size];
|
|
|
|
for (xtt = 0, xt = (x - x1) * sub_pixel_size;
|
|
xtt < (sub_pixel_size + 1);
|
|
xtt++, xt++)
|
|
bot_row[xt] = block[sub_pixel_size][xtt];
|
|
|
|
/* Swap first and last columns */
|
|
|
|
for (yt = 0; yt < (sub_pixel_size + 1); yt++)
|
|
{
|
|
tmp_sample = block[yt][0];
|
|
block[yt][0] = block[yt][sub_pixel_size];
|
|
block[yt][sub_pixel_size] = tmp_sample;
|
|
}
|
|
}
|
|
|
|
/* Swap rows */
|
|
|
|
tmp_row = top_row;
|
|
top_row = bot_row;
|
|
bot_row = tmp_row;
|
|
|
|
/* Call progress display function (if any) */
|
|
|
|
if (progress_func != NULL)
|
|
(* progress_func) (y1, y2, y, progress_data);
|
|
}
|
|
|
|
/* Free memory */
|
|
|
|
for (y = 0; y < (sub_pixel_size + 1); y++)
|
|
g_free (block[y]);
|
|
|
|
g_free (block);
|
|
g_free (top_row);
|
|
g_free (bot_row);
|
|
|
|
return num_samples;
|
|
}
|