b99111e038
This new mode averages the colors of all transparent blocks, instead of making the colors progressively darker and more opaque. This 'average' mode is now the default when using --drawalpha. It can be explicitly selected using --drawalpha=average. The old modes can be selected using --drawalpha=cumulative[-darken]. It is recommended to change the colors of water as well. These are in a separate patch.
301 lines
7.2 KiB
C++
301 lines
7.2 KiB
C++
/*
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* =====================================================================
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* Version: 1.0
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* Created: 25.08.2012 10:55:27
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* Author: Miroslav Bendík
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* Company: LinuxOS.sk
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* =====================================================================
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*/
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#include <cstdlib>
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#include <cstring>
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#include <iostream>
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#include "PixelAttributes.h"
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using namespace std;
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PixelAttribute::AlphaMixingMode PixelAttribute::m_mixMode = PixelAttribute::AlphaMixCumulative;
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PixelAttributes::PixelAttributes():
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m_pixelAttributes(0)
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{
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}
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PixelAttributes::~PixelAttributes()
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{
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freeAttributes();
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}
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void PixelAttributes::setParameters(int width, int lines)
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{
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freeAttributes();
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m_width = width + 1; // 1px gradient calculation
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m_previousLine = 0;
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m_firstLine = 1;
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m_lastLine = m_firstLine + lines - 1;
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m_emptyLine = m_lastLine + 1;
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m_lineCount = m_emptyLine + 1;
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m_firstY = 0;
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m_lastY = -1;
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m_firstUnshadedY = 0;
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m_pixelAttributes = new PixelAttribute *[m_lineCount];
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if (!m_pixelAttributes)
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throw std::runtime_error("Failed to allocate memory for PixelAttributes");
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for (int i = 0; i < m_lineCount; ++i) {
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m_pixelAttributes[i] = new PixelAttribute[m_width];
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if (!m_pixelAttributes[i])
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throw std::runtime_error("Failed to allocate memory for PixelAttributes");
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}
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for (int i=0; i<m_lineCount; i++)
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for (int j=0; j<m_width; j++) {
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m_pixelAttributes[i][j].m_a=0;
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m_pixelAttributes[i][j].next16Empty = (j - 1) % 16 == 0;
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}
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}
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void PixelAttributes::scroll(int keepY)
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{
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int scroll = keepY - m_firstY;
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if (scroll > 0) {
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int i;
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for (i = m_previousLine; i + scroll <= m_lastLine; i++) {
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PixelAttribute *tmp;
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tmp = m_pixelAttributes[i];
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m_pixelAttributes[i] = m_pixelAttributes[i + scroll];
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m_pixelAttributes[i + scroll] = tmp;
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}
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size_t lineLength = m_width * sizeof(PixelAttribute);
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for (; i <= m_lastLine; ++i) {
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memcpy(m_pixelAttributes[i], m_pixelAttributes[m_emptyLine], lineLength);
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}
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m_firstY += scroll;
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m_firstUnshadedY -= scroll;
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if (m_firstUnshadedY < m_firstY) m_firstUnshadedY = m_firstY;
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}
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}
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void PixelAttributes::freeAttributes()
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{
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if (m_pixelAttributes) {
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for (int i = 0; i < m_lineCount; ++i) {
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if (m_pixelAttributes[i] != 0) {
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delete[] m_pixelAttributes[i];
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}
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}
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delete[] m_pixelAttributes;
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m_pixelAttributes = 0;
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}
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}
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static inline double colorSafeBounds(double color)
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{
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if (color > 1) {
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return 1;
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}
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else if (color < 0) {
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return 0;
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}
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else {
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return color;
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}
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}
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void PixelAttributes::renderShading(bool drawAlpha)
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{
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int y;
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for (y = yCoord2Line(m_firstUnshadedY); y <= yCoord2Line(m_lastY); y++) {
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for (int x = 1; x < m_width; x++) {
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if (m_pixelAttributes[y][x].next16Empty) {
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x += 15;
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continue;
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}
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if (!m_pixelAttributes[y][x].isNormalized())
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m_pixelAttributes[y][x].normalize();
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if (!m_pixelAttributes[y][x].is_valid() || !m_pixelAttributes[y - 1][x].is_valid()) {
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if (x + 1 < m_width && !m_pixelAttributes[y][x + 1].isNormalized())
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m_pixelAttributes[y][x + 1].normalize();
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x++;
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continue;
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}
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if (!m_pixelAttributes[y][x - 1].is_valid())
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continue;
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if (!m_pixelAttributes[y][x].m_a)
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continue;
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double h = m_pixelAttributes[y][x].m_h;
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double h1 = m_pixelAttributes[y][x - 1].m_a ? m_pixelAttributes[y][x - 1].m_h : h;
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double h2 = m_pixelAttributes[y - 1][x].m_a ? m_pixelAttributes[y - 1][x].m_h : h;
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double d = (h - h1) + (h - h2);
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if (d > 3) {
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d = 3;
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}
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d = d * 12 / 255;
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#define pixel (m_pixelAttributes[y][x])
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//PixelAttribute &pixel = m_pixelAttributes[y][x];
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if (drawAlpha)
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d = d * (1 - pixel.m_t);
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pixel.m_r = colorSafeBounds(pixel.m_r + d);
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pixel.m_g = colorSafeBounds(pixel.m_g + d);
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pixel.m_b = colorSafeBounds(pixel.m_b + d);
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#undef pixel
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}
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}
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m_firstUnshadedY = y - yCoord2Line(0);
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}
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// Meaning and usage of parameter 'n'.
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//
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// When n==0, all other values should be interpreted as
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// plain color / height / etc.
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//
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// When n is positive, some kind of pixel average is being
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// computed, and the other values represent a sum, with
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// n being the number of items summed.
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//
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// There is a twist when summing colors: Transparent colors
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// should not contribute the same amount to the final average
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// color as opaque colors do.
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// For that reason, the color values (r, g, b) are not simply
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// summed, but they are multiplied by their alpha values
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// first.
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//
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// Conversion from pixelattributes with n>0 to pixelattributes
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// with n==0 is performed as follows:
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// <color-value> = <sum-of-weighed-color-values> / <sum-of-alpha-values>
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// <alpha-value> = <sum-of-alpha-values> / n
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// <height> = <sum-of-heights> / n
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// <thick> = <sum-of-thick-values> / n
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// n = 0
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// The converse is (n would normally be set to 1):
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// <weighed-color-value> = <color-value> * <alpha-value>
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// n = 1
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// Color values with n>0 can be summed.
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// normalize() converts from n>0 to n==0 representation
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void PixelAttribute::normalize(double count, Color defColor)
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{
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if (!m_n) {
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// Already normalized
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return;
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}
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if (m_n < count) {
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m_r += (defColor.r / 255.0) * (defColor.a / 255.0) * (count - m_n);
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m_g += (defColor.g / 255.0) * (defColor.a / 255.0) * (count - m_n);
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m_b += (defColor.b / 255.0) * (defColor.a / 255.0) * (count - m_n);
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m_a += (defColor.a / 255.0) * (count - m_n);
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m_h *= double(count) / m_n;
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m_t *= double(count) / m_n;
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m_n = count;
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}
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if (m_n != 1) {
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m_r /= m_a;
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m_g /= m_a;
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m_b /= m_a;
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m_a /= m_n;
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m_t /= m_n;
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m_h /= m_n;
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}
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m_n = 0;
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}
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void PixelAttribute::add(const PixelAttribute &p)
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{
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if (!m_n) {
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m_r *= m_a;
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m_g *= m_a;
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m_b *= m_a;
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m_n = 1;
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}
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if (!p.m_n) {
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m_r += p.m_r * p.m_a;
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m_g += p.m_g * p.m_a;
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m_b += p.m_b * p.m_a;
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m_a += p.m_a;
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m_t += p.m_t;
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m_h += p.m_h;
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m_n++;
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}
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else {
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m_r += p.m_r;
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m_g += p.m_g;
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m_b += p.m_b;
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m_a += p.m_a;
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m_t += p.m_t;
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m_h += p.m_h;
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m_n += p.m_n;
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}
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}
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void PixelAttribute::mixUnder(const PixelAttribute &p)
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{
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if (!is_valid() || m_a == 0) {
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if (!is_valid() || p.m_a != 0) {
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m_n = p.m_n;
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m_r = p.m_r;
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m_g = p.m_g;
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m_b = p.m_b;
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m_a = p.m_a;
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m_t = 0;
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}
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m_h = p.m_h;
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}
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else if ((m_mixMode & AlphaMixCumulative) == AlphaMixCumulative || (m_mixMode == AlphaMixAverage && p.m_a == 1)) {
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PixelAttribute pp(p);
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#ifdef DEBUG
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assert(pp.isNormalized());
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#else
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if (!pp.isNormalized())
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pp.normalize();
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#endif
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if (!isNormalized())
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normalize();
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int prev_alpha = alpha();
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m_r = (m_a * m_r + pp.m_a * (1 - m_a) * pp.m_r);
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m_g = (m_a * m_g + pp.m_a * (1 - m_a) * pp.m_g);
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m_b = (m_a * m_b + pp.m_a * (1 - m_a) * pp.m_b);
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m_a = (m_a + (1 - m_a) * pp.m_a);
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if (pp.m_a != 1)
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m_t = (m_t + pp.m_t) / 2;
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m_h = pp.m_h;
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if ((m_mixMode & AlphaMixDarkenBit) && prev_alpha >= 254 && pp.alpha() < 255) {
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// Darken
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// Parameters make deep water look good :-)
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// (maybe this setting should be per-node-type, and obtained from the colors file ?)
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m_r = m_r * 0.95;
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m_g = m_g * 0.95;
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m_b = m_b * 0.95;
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if (pp.m_a != 1)
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m_t = (m_t + pp.m_t) / 2;
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}
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}
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#ifdef DEBUG
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else if (m_mixMode == AlphaMixAverage && p.m_a != 1) {
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#else
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else {
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#endif
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if (p.m_a == 1)
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normalize();
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double h = p.m_h;
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double t = m_t;
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add(p);
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if (p.m_a == 1) {
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normalize();
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m_t = t;
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m_a = 1;
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}
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m_h = m_n * h;
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}
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#ifdef DEBUG
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else {
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// Internal error
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assert(1 && m_mixMode);
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}
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#endif
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}
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