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/*
Raster Operations macros
*/
// -------------
// RGB_565
// a.red = a.red - b.red
// a.blue = a.blue - b.blue
// a.green = a.green - b.green
/*
#define ROP_SUB(a, b) \
" bics " #b ", " #b ", #0b00000100000100000 \n"\
" orr " #a ", " #a ", #0b00000100000100000 \n"\
" orr " #a ", " #a ", #0b10000000000000000 \n"\
" sub " #a ", " #a ", " #b " \n"\
" tst " #a ", #0b00000000000100000 \n"\
" biceq " #a ", " #a ", #0b00000000000011111 \n"\
" tst " #a ", #0b00000100000000000 \n"\
" biceq " #a ", " #a ", #0b00000011111100000 \n"\
" tst " #a ", #0b10000000000000000 \n"\
" biceq " #a ", " #a ", #0b01111100000000000 \n"
*/
#define ROP_SUB(a, b) \
" bics " #b ", " #b ", #0b00000100000100000 \n"\
" beq 999f \n"\
" orr " #a ", " #a ", #0b00000100000100000 \n"\
" orr " #a ", " #a ", #(1 << 31) \n"\
" subs " #a ", " #a ", " #b " \n"\
" bicpl " #a ", " #a ", #0b01111100000000000 \n"\
" tst " #a ", #0b00000000000100000 \n"\
" biceq " #a ", " #a ", #0b00000000000011111 \n"\
" tst " #a ", #0b00000100000000000 \n"\
" biceq " #a ", " #a ", #0b00000011111100000 \n"\
"999:\n"
// -------------
// RGB_565
// if ZF set do ROP_SUB, else:
// a.red = (a.red - b.red) / 2
// a.blue = (a.blue - b.blue) / 2
// a.green = (a.green - b.green) / 2
/*
#define ROP_SUB1_2(a, b) \
" movne " #a ", " #a ", lsr #1 \n"\
" bicne " #a ", " #a ", #0b00000010000010000 \n"\
" movne " #b ", " #b ", lsr #1 \n"\
" bicne " #b ", " #b ", #0b00000010000010000 \n"\
\
" bic " #b ", " #b ", #0b00000100000100000 \n"\
" orr " #a ", " #a ", #0b00000100000100000 \n"\
" orr " #a ", " #a ", #0b10000000000000000 \n"\
" sub " #a ", " #a ", " #b " \n"\
" tst " #a ", #0b00000000000100000 \n"\
" biceq " #a ", " #a ", #0b00000000000011111 \n"\
" tst " #a ", #0b00000100000000000 \n"\
" biceq " #a ", " #a ", #0b00000011111100000 \n"\
" tst " #a ", #0b10000000000000000 \n"\
" biceq " #a ", " #a ", #0b01111100000000000 \n"
*/
#define ROP_SUB1_2(a, b) \
" movne " #a ", " #a ", lsr #1 \n"\
" bicne " #a ", " #a ", #0b00000010000010000 \n"\
" movne " #b ", " #b ", lsr #1 \n"\
" bicne " #b ", " #b ", #0b00000010000010000 \n"\
\
" bics " #b ", " #b ", #0b00000100000100000 \n"\
" beq 999f \n"\
" orr " #a ", " #a ", #0b00000100000100000 \n"\
" orr " #a ", " #a ", #(1 << 31) \n"\
" subs " #a ", " #a ", " #b " \n"\
" bicpl " #a ", " #a ", #0b01111100000000000 \n"\
" tst " #a ", #0b00000000000100000 \n"\
" biceq " #a ", " #a ", #0b00000000000011111 \n"\
" tst " #a ", #0b00000100000000000 \n"\
" biceq " #a ", " #a ", #0b00000011111100000 \n"\
"999:\n"
// -------------
// RGB_565
// a.red = a.red + b.red
// a.blue = a.blue + b.blue
// a.green = a.green + b.green
#define ROP_ADD(a, b) \
" bics " #b ", " #b ", #0b00000100000100000 \n"\
" beq 999f \n"\
" bics " #a ", " #a ", #0b00000100000100000 \n"\
" add " #a ", " #a ", " #b " \n"\
" tst " #a ", #0b00000000000100000 \n"\
" orrne " #a ", " #a ", #0b00000000000011111 \n"\
" tst " #a ", #0b00000100000000000 \n"\
" orrne " #a ", " #a ", #0b00000011111100000 \n"\
" tst " #a ", #0b10000000000000000 \n"\
" orrne " #a ", " #a ", #0b01111100000000000 \n"\
"999:\n"
// -------------
// RGB_565
// if ZF set do ROP_ADD, else:
// a.red = (a.red + b.red) / 2
// a.blue = (a.blue + b.blue) / 2
// a.green = (a.green + b.green) / 2
#define ROP_ADD1_2(a, b) \
" bic " #a ", " #a ", #0b00000100000100000 \n"\
" bicne " #a ", " #a ", #0b00001000001000000 \n"\
" bic " #b ", " #b ", #0b00000100000100000 \n"\
" bicne " #b ", " #b ", #0b00001000001000000 \n"\
" add " #a ", " #a ", " #b " \n"\
" movne " #a ", " #a ", lsr #1 \n"\
" tst " #a ", #0b00000000000100000 \n"\
" orrne " #a ", " #a ", #0b00000000000011111 \n"\
" tst " #a ", #0b00000100000000000 \n"\
" orrne " #a ", " #a ", #0b00000011111100000 \n"\
" tst " #a ", #0b10000000000000000 \n"\
" orrne " #a ", " #a ", #0b01111100000000000 \n"
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