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/*
* Copyright (c) 2009-2016, Albertas Vyšniauskas
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without modification, are permitted provided that the following conditions are met:
*
* * Redistributions of source code must retain the above copyright notice, this list of conditions and the following disclaimer.
* * Redistributions in binary form must reproduce the above copyright notice, this list of conditions and the following disclaimer in the documentation and/or other materials provided with the distribution.
* * Neither the name of the software author nor the names of its contributors may be used to endorse or promote products derived from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
* THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS
* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER
* IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
* OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#include "Sampler.h"
#include "ScreenReader.h"
#include "MathUtil.h"
#include <math.h>
#include <gdk/gdk.h>
using namespace math;
struct Sampler
{
int oversample;
SamplerFalloff falloff;
float (*falloff_fnc)(float distance);
ScreenReader* screen_reader;
};
static float sampler_falloff_none(float distance)
{
return 1;
}
static float sampler_falloff_linear(float distance)
{
return 1 - distance;
}
static float sampler_falloff_quadratic(float distance)
{
return 1 - (distance * distance);
}
static float sampler_falloff_cubic(float distance)
{
return 1 - (distance * distance * distance);
}
static float sampler_falloff_exponential(float distance)
{
return 1 / exp(5 * distance * distance);
}
struct Sampler* sampler_new(ScreenReader* screen_reader)
{
Sampler* sampler = new Sampler;
sampler->oversample = 0;
sampler_set_falloff(sampler, SamplerFalloff::none);
sampler->screen_reader = screen_reader;
return sampler;
}
void sampler_destroy(Sampler *sampler)
{
delete sampler;
}
void sampler_set_falloff(Sampler *sampler, SamplerFalloff falloff)
{
sampler->falloff = falloff;
switch (falloff){
case SamplerFalloff::none:
sampler->falloff_fnc = sampler_falloff_none;
break;
case SamplerFalloff::linear:
sampler->falloff_fnc = sampler_falloff_linear;
break;
case SamplerFalloff::quadratic:
sampler->falloff_fnc = sampler_falloff_quadratic;
break;
case SamplerFalloff::cubic:
sampler->falloff_fnc = sampler_falloff_cubic;
break;
case SamplerFalloff::exponential:
sampler->falloff_fnc = sampler_falloff_exponential;
break;
default:
sampler->falloff_fnc = 0;
}
}
void sampler_set_oversample(Sampler *sampler, int oversample)
{
sampler->oversample = oversample;
}
static void get_pixel(unsigned char *data, int stride, int x, int y, Color* color)
{
unsigned char *p;
p = data + y * stride + x * 4;
color->rgb.red = p[2] * (1 / 255.0);
color->rgb.green = p[1] * (1 / 255.0);
color->rgb.blue = p[0] * (1 / 255.0);
}
int sampler_get_color_sample(Sampler *sampler, Vec2<int>& pointer, Rect2<int>& screen_rect, Vec2<int>& offset, Color* color)
{
Color sample, result;
float divider = 0;
color_zero(&result);
cairo_surface_t *surface = screen_reader_get_surface(sampler->screen_reader);
int x = pointer.x, y = pointer.y;
int left, right, top, bottom;
left = max_int(screen_rect.getLeft(), x - sampler->oversample);
right = min_int(screen_rect.getRight(), x + sampler->oversample + 1);
top = max_int(screen_rect.getTop(), y - sampler->oversample);
bottom = min_int(screen_rect.getBottom(), y + sampler->oversample + 1);
int width = right - left;
int height = bottom - top;
int center_x = x - left;
int center_y = y - top;
float max_distance = 1 / sqrt(2 * pow((double)sampler->oversample, 2));
unsigned char *data = cairo_image_surface_get_data(surface);
int stride = cairo_image_surface_get_stride(surface);
for (int x=-sampler->oversample; x <= sampler->oversample; ++x){
for (int y=-sampler->oversample; y <= sampler->oversample; ++y){
if ((center_x + x < 0) || (center_y + y < 0)) continue;
if ((center_x + x >= width) || (center_y + y >= height)) continue;
get_pixel(data, stride, offset.x + center_x + x, offset.y + center_y + y, &sample);
float f;
if (sampler->oversample){
f = sampler->falloff_fnc(sqrt((double)(x * x + y * y)) * max_distance);
}else{
f = 1;
}
color_multiply(&sample, f);
color_add(&result, &sample);
divider += f;
}
}
if (divider > 0)
color_multiply(&result, 1 / divider);
color_copy(&result, color);
return 0;
}
enum SamplerFalloff sampler_get_falloff(Sampler *sampler)
{
return sampler->falloff;
}
int sampler_get_oversample(Sampler *sampler)
{
return sampler->oversample;
}
void sampler_get_screen_rect(Sampler *sampler, math::Vec2<int>& pointer, math::Rect2<int>& screen_rect, math::Rect2<int> *rect)
{
int left, right, top, bottom;
left = max_int(screen_rect.getLeft(), pointer.x - sampler->oversample);
right = min_int(screen_rect.getRight(), pointer.x + sampler->oversample + 1);
top = max_int(screen_rect.getTop(), pointer.y - sampler->oversample);
bottom = min_int(screen_rect.getBottom(), pointer.y + sampler->oversample + 1);
*rect = math::Rect2<int>(left, top, right, bottom);
}
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