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Bitmap.cpp
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Bitmap.cpp
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/**
* GUI library for "mac/μac"
* Author: Peter "Projectitis" Vullings <[email protected]>
* Distributed under the MIT licence
**/
#include "Bitmap.h"
/**
* This file is part of the mac (or μac) "Microprocessor App Creator" library.
* mac is a project that enables creating beautiful and useful apps on the
* Teensy microprocessor, but hopefully is generic enough to be ported to other
* microprocessor boards. The various libraries that make up mac might also
* be useful in other projects.
**/
namespace mac{
/**
* Check whether a pixel format includes an alpha channel or not
* @param pixelFormat The pixel format to check
* @return Return true if the pixel format has an alpha channel, otherwise false
*/
boolean pixelFormatHasAlpha( PixelFormat pixelFormat ){
switch (pixelFormat){
case mac::PF_4444: return true;
case mac::PF_6666: return true;
case mac::PF_8565: return true;
case mac::PF_8888: return true;
default: return false;
}
}
/**
* Return the width, in bytes, of a pixel stored in this format
* @param pixelFormat The pixel format to check
* @return The width in number of bytes
*/
uint8_t pixelFormatByteWidth( PixelFormat pixelFormat ){
switch (pixelFormat){
case mac::PF_565: return 2;
case mac::PF_4444: return 2;
case mac::PF_6666: return 3;
case mac::PF_8565: return 3;
case mac::PF_888: return 3;
case mac::PF_8888: return 4;
case mac::PF_GRAYSCALE: return 1;
case mac::PF_MONO: return 0;
case mac::PF_INDEXED: return 1;
case mac::PF_UNKNOWN: return 0;
default: return 0;
}
}
/**
* ###### ##### ######
* ## ## ##
* ##### ##### #####
* ## ## ## ##
* ##### #### #####
*/
/*
* ### BITMAP ACCESS
*/
/**
* The following functions get a pixel from a bitmap and convert to RGB565 and 5-bit alpha.
* Use these functions if you are using the fast alpha-blending function below that requires
* 5-bit alpha (0-31). If you are using libraries that require 8-bit alpha, use the ...as8565
* functions instead.
*/
void get565as5565( uint8_t* p, uint16_t& c, uint8_t& a ){
c = (p[0] << 8) | p[1];
}
void get4444as5565( uint8_t* p, uint16_t& c, uint8_t& a ){
a = ((p[0] >> 3) & 0b11110) | ((p[0] >> 7) & 0b1); // 5-bit alpha
c = ((p[0] & 0b1111) << 12) | ((p[0] & 0b1000) << 8)
| ((p[1] & 0b11110000) << 3) | ((p[1] & 0b11000000) >> 1)
| ((p[1] & 0b1111) << 1) | ((p[1] & 0b1000) >> 3);
}
void get6666as5565( uint8_t* p, uint16_t& c, uint8_t& a ){
a = (p[0] >> 3); // 5-bit alpha
c = (p[0] << 14) | ((p[1] << 6) & 0b0011100000000000) | ((p[1] << 7) & 0b0000011110000000) | ((p[1] >> 1) & 0b0000000001111111);
}
void get8565as5565( uint8_t* p, uint16_t& c, uint8_t& a ){
a = (p[0] >> 3); // 8-bit to 5-bit alpha
c = (p[1] << 8) | p[2];
}
void get888as5565( uint8_t* p, uint16_t& c, uint8_t& a ){
c = ((p[0] & 0b11111000) << 8) | ((p[1] & 0b11111100) << 3) | ((p[1] & 0b11111000) >> 3);
}
void get8888as5565( uint8_t* p, uint16_t& c, uint8_t& a ){
a = (p[0] >> 3); // 8-bit to 5-bit alpha
c = ((p[1] & 0b11111000) << 8) | ((p[2] & 0b11111100) << 3) | ((p[3] & 0b11111000) >> 3);
}
void get8as5565( uint8_t* p, uint16_t& c, uint8_t& a ){
c = ((p[0] & 0xF8) << 8) | ((p[0] & 0xFC) << 3) | ((p[0] & 0xF8) >> 3);
}
void get1as5565( uint8_t* p, uint16_t& c, uint8_t& a ){
// Hijack 'a' as bit index (0-7 from left to right)
c = ((p[0] >> (7-a)) & 0b1)?RGB565_White:RGB565_Black;
}
/**
* Use getAccessor5565 on a tilemap to choose the correct data access function.
*/
access5565 getAccessor5565( PixelFormat pixelFormat ){
switch (pixelFormat){
case mac::PF_565: return get565as5565;
case mac::PF_4444: return get4444as5565;
case mac::PF_6666: return get6666as5565;
case mac::PF_8565: return get8565as5565;
case mac::PF_888: return get888as5565;
case mac::PF_8888: return get8888as5565;
case mac::PF_GRAYSCALE: return get8as5565;
case mac::PF_MONO: return get1as5565;
case mac::PF_INDEXED: return 0; // XXX: Handle indexed colors
case mac::PF_UNKNOWN: return 0;
}
return 0;
}
/**
* The following functions get a pixel from a bitmap and convert to RGB565 and 8-bit alpha.
*/
void get565as8565( uint8_t* p, uint16_t& c, uint8_t& a ){
c = (p[0] << 8) | p[1];
}
void get4444as8565( uint8_t* p, uint16_t& c, uint8_t& a ){
a = (p[0] & 0b11110000) | (p[0] >> 4); // 8-bit alpha
c = ((p[0] & 0b1111) << 12) | ((p[0] & 0b1000) << 8)
| ((p[1] & 0b11110000) << 3) | ((p[1] & 0b11000000) >> 1)
| ((p[1] & 0b1111) << 1) | ((p[1] & 0b1000) >> 3);
}
void get6666as8565( uint8_t* p, uint16_t& c, uint8_t& a ){
a = (p[0] & 0b11111100) | ((p[0] >> 6) & 0b11);
c = (p[0] << 14) | ((p[1] << 6) & 0b0011100000000000) | ((p[1] << 7) & 0b0000011110000000) | ((p[1] >> 1) & 0b0000000001111111);
}
void get8565as8565( uint8_t* p, uint16_t& c, uint8_t& a ){
a = p[0]; // Already 8-bit alpha
c = (p[1] << 8) | p[2];
}
void get888as8565( uint8_t* p, uint16_t& c, uint8_t& a ){
c = ((p[0] & 0b11111000) << 8) | ((p[1] & 0b11111100) << 3) | ((p[1] & 0b11111000) >> 3);
}
void get8888as8565( uint8_t* p, uint16_t& c, uint8_t& a ){
a = p[0]; // Already 8-bit alpha
c = ((p[1] & 0b11111000) << 8) | ((p[2] & 0b11111100) << 3) | ((p[3] & 0b11111000) >> 3);
}
void get8as8565( uint8_t* p, uint16_t& c, uint8_t& a ){
c = ((p[0] & 0xF8) << 8) | ((p[0] & 0xFC) << 3) | ((p[0] & 0xF8) >> 3);
}
void get1as8565( uint8_t* p, uint16_t& c, uint8_t& a ){
// Hijack 'a' as bit index (0-7 from left to right)
c = ((p[0] >> (7-a)) & 0b1)?RGB565_White:RGB565_Black;
}
/**
* Use getAccessor8565 on a tilemap to choose the correct data access function.
*/
access8565 getAccessor8565( PixelFormat pixelFormat ){
switch (pixelFormat){
case mac::PF_565: return get565as8565;
case mac::PF_4444: return get4444as8565;
case mac::PF_6666: return get6666as8565;
case mac::PF_8565: return get8565as8565;
case mac::PF_888: return get888as8565;
case mac::PF_8888: return get8888as8565;
case mac::PF_GRAYSCALE: return get8as8565;
case mac::PF_MONO: return get1as8565;
case mac::PF_INDEXED: return 0; // XXX: Handle indexed colors
case mac::PF_UNKNOWN: return 0;
}
return 0;
}
/**
* ##### ##### #####
* ## ## ## ## ##
* ##### ## ### #####
* ## ## ## ## ## ##
* ## ## ###### #####
*/
/*
* ### BITMAP ACCESS
*/
/**
* The following functions get a pixel from the bitmap and convert to 8-bit per channel A,R,G,B components.
*/
void get565asARGB( uint8_t* p, uint8_t& a, uint8_t& r, uint8_t& g, uint8_t& b ){
r = (p[0] & 0b11111000) | ((p[0] & 0b11100000) >> 5);
g = ((p[0] & 0b111) << 5) | ((p[1] & 0b11100000) >> 3) | ((p[0] & 0b11) >> 6);
b = ((p[1] & 0b11111) << 3) | ((p[1] & 0b11100) >> 2);
}
void get4444asARGB( uint8_t* p, uint8_t& a, uint8_t& r, uint8_t& g, uint8_t& b ){
a = (p[0] & 0b11110000) | (p[0] >> 4);
r = (p[0] << 4) | (p[0] & 0b1111);
g = (p[1] & 0b11110000) | (p[1] >> 4);
b = (p[1] << 4) | (p[1] & 0b1111);
}
void get6666asARGB( uint8_t* p, uint8_t& a, uint8_t& r, uint8_t& g, uint8_t& b ){
a = (p[0] & 0b11111100 ) | ((p[0] >> 6) & 0b11);
r = ((p[0] << 6) & 0b11000000) | (p[0] & 0b11) | ((p[1]>>2) & 0b111100);
g = ((p[1] << 4) & 0b11110000) | ((p[1] >> 2) & 0b11) | ((p[2]>>4) & 0b1100);
b = ((p[2] << 2) & 0b11111100) | ((p[2] >> 4) & 0b11);
}
void get8565asARGB( uint8_t* p, uint8_t& a, uint8_t& r, uint8_t& g, uint8_t& b ){
a = p[0];
r = (p[1] & 0b11111000) | ((p[1] >> 5) & 0b111);
g = ((p[1] << 5) & 0b11100000) | ((p[1] >> 1) & 0b11) | ((p[2] >> 3) & 0b11100);
b = ((p[2] << 3) & 0b11111000) | ((p[2] >> 2) & 0b111);
}
void get888asARGB( uint8_t* p, uint8_t& a, uint8_t& r, uint8_t& g, uint8_t& b ){
r = p[0];
g = p[1];
b = p[2];
}
void get8888asARGB( uint8_t* p, uint8_t& a, uint8_t& r, uint8_t& g, uint8_t& b ){
a = p[0];
r = p[1];
g = p[2];
b = p[3];
}
void get8asARGB( uint8_t* p, uint8_t& a, uint8_t& r, uint8_t& g, uint8_t& b ){
r = p[0];
g = p[0];
b = p[0];
}
void get1asARGB( uint8_t* p, uint8_t& a, uint8_t& r, uint8_t& g, uint8_t& b ){
// Hijack 'a' as bit index (0-7 from left to right)
r = g = b = ((p[0] >> (7-a)) & 0b1)?255:0;
}
/**
* Use getAccessorARGB on a tilemap to choose the correct data access function.
*/
typedef void (*accessARGB)( uint8_t*, uint8_t&, uint8_t&, uint8_t&, uint8_t& );
accessARGB getAccessorARGB( PixelFormat pixelFormat ){
switch (pixelFormat){
case mac::PF_565: return get565asARGB;
case mac::PF_4444: return get4444asARGB;
case mac::PF_6666: return get6666asARGB;
case mac::PF_8565: return get8565asARGB;
case mac::PF_888: return get888asARGB;
case mac::PF_8888: return get8888asARGB;
case mac::PF_GRAYSCALE: return get8asARGB;
case mac::PF_MONO: return get1asARGB;
case mac::PF_INDEXED: return 0; // XXX: Handle indexed colors
case mac::PF_UNKNOWN: return 0;
}
return 0;
}
/**
* ##### ##### #####
* ## ## ## ## ## ##
* ##### ##### #####
* ## ## ## ## ## ##
* ##### ##### #####
*/
/*
* ### BITMAP ACCESS
*/
/**
* The following functions get a pixel from the bitmap and convert to 32-bit ARGB value
*/
void get565as8888( uint8_t* p, uint32_t& c ){
c = (255 << 24)
| ((p[0] & 0b11111000) << 16) | ((p[0] & 0b11100000) << 11) // R
| ((p[0] & 0b111) << 13) | ((p[1] & 0b11100000) << 5) | ((p[0] & 0b11) << 2) // G
| ((p[1] & 0b11111) << 3) | ((p[1] & 0b11100) >> 2); // B
}
void get4444as8888( uint8_t* p, uint32_t& c ){
c = ((p[0] & 0b11110000) << 24) | (p[0] << 20) | ((p[0] & 0b1111) << 16) | ((p[1] & 0b11110000) << 8) | (p[1] << 4) | (p[1] & 0b1111);
}
void get6666as8888( uint8_t* p, uint32_t& c ){
c = ((p[0] & 0b11111100 ) << 24) | ((p[0] & 0b11000000) << 18) // A
| ((p[0] & 0b11) << 22) | ((p[0] & 0b11) << 16) | ((p[1] & 0b11110000) << 14) // R
| ((p[1] & 0b1111) << 12) | ((p[1] & 0b1100) << 6) | ((p[2] & 0b11000000) << 4) // G
| ((p[2] & 0b111111) << 2) | ((p[2] & 0b110000) >> 4); // B
}
void get8565as8888( uint8_t* p, uint32_t& c ){
c = (p[0] << 24) // A
| ((p[1] & 0b11111000) << 16) | ((p[1] & 0b11100000) << 11) // R
| ((p[1] & 0b111) << 13) | ((p[1] & 0b110) << 7) | ((p[2] & 0b11100000) << 5) // G
| ((p[2] << 3) & 0b11111000) | ((p[2] >> 2) & 0b111); // B
}
void get888as8888( uint8_t* p, uint32_t& c ){
c = (255 << 24) | (p[1] << 16) | (p[2] << 8) | p[3];
}
void get8888as8888( uint8_t* p, uint32_t& c ){
c = (p[0] << 24) | (p[1] << 16) | (p[2] << 8) | p[3];
}
void get8as8888( uint8_t* p, uint32_t& c ){
c = (255 << 24) | (p[0] << 16) | (p[0] << 8) | p[0];
}
void get1as8888( uint8_t* p, uint32_t& c ){
// Hijack 'c' as bit index (0-7 from left to right)
c = ((p[0] >> (7-c)) & 0b1)?RGB888_White:RGB888_Black;
}
/**
* Use getAccessor8888 on a tilemap to choose the correct data access function.
*/
typedef void (*access8888)( uint8_t*, uint32_t& );
access8888 getAccessor8888( PixelFormat pixelFormat ){
switch (pixelFormat){
case mac::PF_565: return get565as8888;
case mac::PF_4444: return get4444as8888;
case mac::PF_6666: return get6666as8888;
case mac::PF_8565: return get8565as8888;
case mac::PF_888: return get888as8888;
case mac::PF_8888: return get8888as8888;
case mac::PF_GRAYSCALE: return get8as8888;
case mac::PF_MONO: return get1as8888;
case mac::PF_INDEXED: return 0; // XXX: Handle indexed colors
case mac::PF_UNKNOWN: return 0;
}
return 0;
}
} // ns