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// Jason Rohrer
// IconMap.h
/**
*
* Simple 2d icon map
*
*
* Created 12-12-99
* Mods:
* Jason Rohrer 12-13-99 Added numPixels member
* Jason Rohrer 3-22-2000 Added support for drawing icon maps into an icon map
* Jason Rohrer 12-17-2000 Added include of Color.h
*/
#ifndef ICON_MAP_INCLUDED
#define ICON_MAP_INCLUDED
#include <string.h>
#include "Color.h"
class IconMap {
public:
IconMap( int w, int h); // construct a map of a certain width and height
IconMap( int w, int h, int *offset );
// pass in precomputed y offsets into image map
~IconMap();
int wide;
int high;
int numPixels;
int *yOffset;
unsigned long *imageMap;
// draw a solid IconMap into this IconMap
void drawIconMap( IconMap *icon, int xPos, int yPos );
// draw a transparent IconMap into this IconMap
void drawIconMapAlpha( IconMap *icon, int xPos, int yPos );
void copy( IconMap *icon ); // copy contents of another icon map into this one
// does nothing if icon maps aren't the same size
private:
char yOffsetExternal; // is the yOffset ptr external?
float invChannelMax;
Color utilColor;
};
inline IconMap::IconMap( int w, int h ) {
invChannelMax = 1 / 255.0;
wide = w;
high = h;
numPixels = wide * high;
imageMap = new unsigned long[ wide * high ];
yOffset = new int[high];
for( int y=0; y<high; y++ ) { // precalc y offsets
yOffset[y] = y * wide;
}
yOffsetExternal = false;
}
inline IconMap::IconMap( int w, int h, int *offset ) {
invChannelMax = 1 / 255.0;
wide = w;
high = h;
numPixels = wide * high;
imageMap = new unsigned long[ wide * high ];
yOffset = offset;
yOffsetExternal = true;
}
inline IconMap::~IconMap() {
delete [] imageMap;
if( !yOffsetExternal ) {
delete [] yOffset;
}
}
inline void IconMap::drawIconMap( IconMap *icon, int xPos, int yPos ) {
unsigned long *image = icon->imageMap;
int *imageYOffset = icon->yOffset;
int imageWide = icon->wide;
int imageHigh = icon->high;
// watch for buffer bounds
int minY = yPos;
if( minY < 0 ) {
minY = 0;
}
int maxY = yPos + imageHigh;
if( maxY > high ) {
maxY = high;
}
int minX = xPos;
if( minX < 0 ) {
minX = 0;
}
int maxX = xPos + imageWide;
if( maxX > wide ) {
maxX = wide;
}
for( int y=minY; y<maxY; y++ ) {
int imageY = y-yPos;
int buffYContrib = yOffset[y];
int imageYContrib = imageYOffset[imageY];
for( int x=minX; x<maxX; x++ ) {
int imageX = x-xPos;
imageMap[ buffYContrib + x ] = image[ imageYContrib + imageX ];
}
}
}
inline void IconMap::drawIconMapAlpha( IconMap *icon, int xPos, int yPos ) {
unsigned long *image = icon->imageMap;
int *imageYOffset = icon->yOffset;
int imageWide = icon->wide;
int imageHigh = icon->high;
// watch for buffer bounds
int minY = yPos;
if( minY < 0 ) {
minY = 0;
}
int maxY = yPos + imageHigh;
if( maxY > high ) {
maxY = high;
}
int minX = xPos;
if( minX < 0 ) {
minX = 0;
}
int maxX = xPos + imageWide;
if( maxX > wide ) {
maxX = wide;
}
for( int y=minY; y<maxY; y++ ) {
int imageY = y-yPos;
int buffYContrib = yOffset[y];
int imageYContrib = imageYOffset[imageY];
for( int x=minX; x<maxX; x++ ) {
int imageX = x-xPos;
// get alpha value for this icon pixel
unsigned long argb = image[ imageYContrib + imageX ];
float alpha = (argb >> 24) * invChannelMax;
float oneMinusAlpha = 1-alpha;
unsigned long buffARGB = imageMap[ buffYContrib + x ];
argb = utilColor.getWeightedComposite( argb, alpha );
buffARGB = utilColor.getWeightedComposite( buffARGB, oneMinusAlpha );
unsigned long sum = utilColor.sumComposite( argb, buffARGB );
imageMap[ buffYContrib + x ] = sum;
}
}
}
inline void IconMap::copy( IconMap *icon ) {
// make sure they are the same size
if( numPixels != icon->numPixels ) {
return;
}
// void * memcpy (void * dst, const void * src, size_t len);
// each pixel is 4 bytes, so shift numPixels by 2
memcpy( (void *)(imageMap), (void *)(icon->imageMap), numPixels << 2 );
}
#endif
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