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