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/*
* This file is released under the GNU General Public Licence
*
* authors:
* Richard Ashbury <richard.asbury@btinternet.com>
* Jean-Christophe Hoelt <jeko@ios-software.com>
*/
#include "corona_palette.h"
#include <cstdlib>
#include <cstring>
using namespace std;
///////////////////////////////////////////////////////////////////////////////
// Palette stored in compressed format (just checkpoints)
class CompressedPalette
{
public:
ColorRGB m_col[16];
int m_ind[16];
int m_nb;
CompressedPalette() : m_nb(0) {}
void push_color(int i, ColorRGB col) { m_col[m_nb] = col; m_ind[m_nb++] = i; }
void expand(Palette pal) const;
};
///////////////////////////////////////////////////////////////////////////////
PaletteCycler::PaletteCycler(const int palettes[][NB_PALETTES], int nbPalettes)
: m_palettes(palettes, nbPalettes)
{
for (int i=0;i<256;++i) {
m_curpal[i].rgbBlue = 0;
m_curpal[i].rgbGreen = 0;
m_curpal[i].rgbRed = 0;
}
startPaletteTransition();
affectPaletteTransition(1);
m_transferring = false;
m_srcnum = m_destnum;
}
void PaletteCycler::startPaletteTransition()
{
if (m_palettes.size() > 0)
{
// Copy the current palette to the "source palette"
memcpy(m_srcpal, m_curpal, sizeof(m_srcpal));
// Create a new palette as the "destination palette"
m_srcnum = m_destnum;
m_destnum = rand() % (int) m_palettes.size();
m_palettes.expandPalette(m_destnum, m_destpal);
// Begin the transition
m_transferring = true;
m_progress = 0;
}
}
void PaletteCycler::update(TimedLevel *pLevels)
{
// Randomly change the destination palette
if (pLevels->timeStamp - pLevels->lastbeat > 10000000) {
if (rand() % 100 == 0) startPaletteTransition();
}
else {
if (rand() % 400 == 0) startPaletteTransition();
}
// Continue any current palette transtion
if (m_transferring) {
if (pLevels->timeStamp - pLevels->lastbeat > 10000000) m_progress += 0.01;
else m_progress += 0.005;
if (m_progress >= 1) {
m_transferring = false;
m_progress = 1;
m_srcnum = m_destnum;
}
// Use an inverse sigmoid transition to emphasise the midway palette
double x;
if (m_progress < 0.5) x = 2 * m_progress * (1 - m_progress);
else x = 2 * m_progress * (m_progress - 1) + 1;
affectPaletteTransition(x);
}
}
void PaletteCycler::affectPaletteTransition(double p)
{
for (int i = 0; i < 256; ++i)
{
ColorRGB c1 = m_srcpal[i];
ColorRGB c2 = m_destpal[i];
m_curpal[i].rgbRed = (unsigned char) ((1 - p) * c1.rgbRed + p * c2.rgbRed);
m_curpal[i].rgbGreen = (unsigned char) ((1 - p) * c1.rgbGreen + p * c2.rgbGreen);
m_curpal[i].rgbBlue = (unsigned char) ((1 - p) * c1.rgbBlue + p * c2.rgbBlue);
}
}
///////////////////////////////////////////////////////////////////////////////
void CompressedPalette::expand(Palette dest) const
{
ColorRGB col;
int entry = 0;
col.rgbBlue = col.rgbGreen = col.rgbRed = 0;
int i = 0;
for (; i < m_nb; ++i)
{
int j = entry;
for (; j < m_ind[i]; ++j)
{
double t = (double) (j - entry) / (m_ind[i] - entry);
dest[j].rgbRed = (unsigned char) ((1 - t) * col.rgbRed + t * m_col[i].rgbRed);
dest[j].rgbGreen = (unsigned char) ((1 - t) * col.rgbGreen + t * m_col[i].rgbGreen);
dest[j].rgbBlue = (unsigned char) ((1 - t) * col.rgbBlue + t * m_col[i].rgbBlue);
}
entry = j;
col = m_col[i];
}
for (; entry < 256; ++entry) dest[entry] = col;
}
///////////////////////////////////////////////////////////////////////////////
PaletteCollection::PaletteCollection(const int palettes[][NB_PALETTES], int nbPalettes)
{
m_cpal = new CompressedPalette[nbPalettes];
m_nbPalettes = nbPalettes;
// Set up the palettes from the array
for (int i = 0; i < nbPalettes; ++i)
{
CompressedPalette newpal;
const int* pal = palettes[i];
for (int j = 1; j < pal[0] * 2; j += 2)
{
ColorRGB rgb;
rgb.rgbRed = (pal[j + 1] & 0xff0000) >> 16;
rgb.rgbGreen = (pal[j + 1] & 0xff00) >> 8;
rgb.rgbBlue = pal[j + 1] & 0xff;
newpal.push_color(pal[j], rgb);
}
m_cpal[i] = newpal;
}
}
PaletteCollection::~PaletteCollection()
{
delete[] m_cpal;
}
void PaletteCollection::expandPalette(int i, Palette dest) const
{
m_cpal[i].expand(dest);
}
///////////////////////////////////////////////////////////////////////////////
void blitSurface8To32(unsigned char *byteSurf, int *colorSurf, int palette[256], int size)
{
int i = 0;
while(size--) {
colorSurf[i++] = palette[byteSurf[size]];
}
}
void paletteToRGBA(int dest[256], const Palette src)
{
for (int i=0; i<256; ++i) {
int alpha = (i<128?i*2:255);
dest[i] = (alpha << 24) | ((int)src[i].rgbRed << 16) | ((int)src[i].rgbGreen << 8) | (int)src[i].rgbBlue;
/* dest[i] = ((int)i << 24) | ((int)src[i].rgbRed << 0) | ((int)src[i].rgbGreen << 8) | ((int)src[i].rgbBlue << 16); */
}
}
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