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/*****************************************************************************
* Copyright 2013 - 2015 Yichao Yu <yyc1992@gmail.com> *
* *
* This program 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 2.1 of the *
* License, or (at your option) version 3, or any later version accepted *
* by the membership of KDE e.V. (or its successor approved by the *
* membership of KDE e.V.), which shall act as a proxy defined in *
* Section 6 of version 3 of the license. *
* *
* This program 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 *
* Lesser 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 "shadow_p.h"
#include "log.h"
#include <cstdlib>
static void
qtcCreateShadowGradient(float *buff, size_t size)
{
const float r = size / 6.5;
for (size_t i = 0;i < size;i++) {
buff[i] = qtcMax(0, expf(-(i / r)) - 0.0015);
}
}
static void
qtcFillShadowPixel(uint8_t *pixel, const QtcColor *c1,
const QtcColor *c2, double bias, QtcPixelByteOrder order)
{
uint8_t alpha = qtcBound(0, 0xff * bias, 0xff);
if (alpha == 0) {
memset(pixel, 0, 4);
return;
}
QtcColor color;
// c1 is the start color, c2 the end color
_qtcColorMix(c2, c1, bias, &color);
uint8_t red = qtcBound(0, 0xff * color.red, 0xff) * alpha / 0xff;
uint8_t green = qtcBound(0, 0xff * color.green, 0xff) * alpha / 0xff;
uint8_t blue = qtcBound(0, 0xff * color.blue, 0xff) * alpha / 0xff;
switch (order) {
case QTC_PIXEL_ARGB:
pixel[0] = alpha;
pixel[1] = red;
pixel[2] = green;
pixel[3] = blue;
break;
case QTC_PIXEL_BGRA:
pixel[0] = blue;
pixel[1] = green;
pixel[2] = red;
pixel[3] = alpha;
break;
default:
case QTC_PIXEL_RGBA:
pixel[0] = red;
pixel[1] = green;
pixel[2] = blue;
pixel[3] = alpha;
break;
}
}
static inline float
_qtcDistance(int x, int y, int x0, int y0, bool square)
{
int dx = x - x0;
int dy = y - y0;
if (dx == 0) {
return std::abs(dy);
}
if (dy == 0) {
return std::abs(dx);
}
return (square ? qtcMax(std::abs(dx), std::abs(dy)) :
sqrtf(dx * dx + dy * dy));
}
static inline float
_qtcGradientGetValue(float *gradient, size_t size, float distance)
{
if (distance < 0 || distance > size - 1) {
return 0;
}
int index = floorf(distance);
if (qtcEqual(index, distance)) {
return gradient[index];
}
return (gradient[index] * (index + 1 - distance) +
gradient[index + 1] * (distance - index));
}
static QtCurve::Image*
qtcShadowSubImage(size_t size, float *gradient, int vertical_align,
int horizontal_align, const QtcColor *c1, const QtcColor *c2,
bool square, QtcPixelByteOrder order)
{
int height = vertical_align ? size : 1;
int y0 = vertical_align == -1 ? height - 1 : 0;
int width = horizontal_align ? size : 1;
int x0 = horizontal_align == -1 ? width - 1 : 0;
auto *res = new QtCurve::Image(width, height, 4);
for (int x = 0;x < width;x++) {
for (int y = 0;y < height;y++) {
qtcFillShadowPixel(
&res->data[(x + y * width) * 4], c1, c2,
_qtcGradientGetValue(
gradient, size, _qtcDistance(x, y, x0, y0, square)), order);
}
}
return res;
}
void
qtcShadowCreate(size_t size, const QtcColor *c1, const QtcColor *c2,
size_t radius, bool square, QtcPixelByteOrder order,
QtCurve::Image **images)
{
size_t full_size = size + radius;
QtCurve::LocalBuff<float, 128> gradient(full_size);
for (size_t i = 0;i < radius;i++) {
gradient[i] = 0;
}
qtcCreateShadowGradient(gradient.get() + radius, size);
int aligns[8][2] = {
{0, -1},
{1, -1},
{1, 0},
{1, 1},
{0, 1},
{-1, 1},
{-1, 0},
{-1, -1},
};
for (int i = 0;i < 8;i++) {
images[i] = qtcShadowSubImage(full_size, gradient.get(), aligns[i][1],
aligns[i][0], c1, c2, square, order);
}
}
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