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Further AVR bitmask tweaks, sorry about that

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This commit is contained in:
Phillip Burgess 2015-12-28 13:52:26 -08:00
parent 9cb1ec4401
commit a6a9359352
2 changed files with 31 additions and 44 deletions
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.Adafruit_GFX.cpp.swp Normal file
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Adafruit_GFX.cpp
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@ -46,11 +46,6 @@ POSSIBILITY OF SUCH DAMAGE.
#define min(a,b) (((a) < (b)) ? (a) : (b))
#endif
// Bitmask tables of 0x80>>X and ~(0x80>>X), because X>>Y is slow on AVR
static const uint8_t PROGMEM
GFXsetBit[] = { 0x80, 0x40, 0x20, 0x10, 0x08, 0x04, 0x02, 0x01 },
GFXclrBit[] = { 0x7F, 0xBF, 0xDF, 0xEF, 0xF7, 0xFB, 0xFD, 0xFE };
Adafruit_GFX::Adafruit_GFX(int16_t w, int16_t h):
WIDTH(w), HEIGHT(h)
{
@ -366,15 +361,13 @@ void Adafruit_GFX::drawBitmap(int16_t x, int16_t y,
const uint8_t *bitmap, int16_t w, int16_t h, uint16_t color) {
int16_t i, j, byteWidth = (w + 7) / 8;
uint8_t bitnum, byte;
uint8_t byte;
for(j=0; j<h; j++) {
for(i=0; i<w; i++) {
bitnum = i & 7;
if(!bitnum) byte = pgm_read_byte(bitmap + j * byteWidth + i / 8);
if(byte & pgm_read_byte(&GFXsetBit[bitnum])) {
drawPixel(x+i, y+j, color);
}
if(i & 7) byte <<= 1;
else byte = pgm_read_byte(bitmap + j * byteWidth + i / 8);
if(byte & 0x80) drawPixel(x+i, y+j, color);
}
}
}
@ -386,17 +379,14 @@ void Adafruit_GFX::drawBitmap(int16_t x, int16_t y,
const uint8_t *bitmap, int16_t w, int16_t h, uint16_t color, uint16_t bg) {
int16_t i, j, byteWidth = (w + 7) / 8;
uint8_t bitnum, byte;
uint8_t byte;
for(j=0; j<h; j++) {
for(i=0; i<w; i++ ) {
bitnum = i & 7;
if(!bitnum) byte = pgm_read_byte(bitmap + j * byteWidth + i / 8);
if(byte & pgm_read_byte(&GFXsetBit[bitnum])) {
drawPixel(x+i, y+j, color);
} else {
drawPixel(x+i, y+j, bg);
}
if(i & 7) byte <<= 1;
else byte = pgm_read_byte(bitmap + j * byteWidth + i / 8);
if(byte & 0x80) drawPixel(x+i, y+j, color);
else drawPixel(x+i, y+j, bg);
}
}
}
@ -406,15 +396,13 @@ void Adafruit_GFX::drawBitmap(int16_t x, int16_t y,
uint8_t *bitmap, int16_t w, int16_t h, uint16_t color) {
int16_t i, j, byteWidth = (w + 7) / 8;
uint8_t bitnum, byte;
uint8_t byte;
for(j=0; j<h; j++) {
for(i=0; i<w; i++ ) {
bitnum = i & 7;
if(!bitnum) byte = bitmap[j * byteWidth + i / 8];
if(byte & pgm_read_byte(&GFXsetBit[bitnum])) {
drawPixel(x+i, y+j, color);
}
if(i & 7) byte <<= 1;
else byte = bitmap[j * byteWidth + i / 8];
if(byte & 0x80) drawPixel(x+i, y+j, color);
}
}
}
@ -424,17 +412,14 @@ void Adafruit_GFX::drawBitmap(int16_t x, int16_t y,
uint8_t *bitmap, int16_t w, int16_t h, uint16_t color, uint16_t bg) {
int16_t i, j, byteWidth = (w + 7) / 8;
uint8_t bitnum, byte;
uint8_t byte;
for(j=0; j<h; j++) {
for(i=0; i<w; i++ ) {
bitnum = i & 7;
if(!bitnum) byte = bitmap[j * byteWidth + i / 8];
if(byte & pgm_read_byte(&GFXsetBit[bitnum])) {
drawPixel(x+i, y+j, color);
} else {
drawPixel(x+i, y+j, bg);
}
if(i & 7) byte <<= 1;
else byte = bitmap[j * byteWidth + i / 8];
if(byte & 0x80) drawPixel(x+i, y+j, color);
else drawPixel(x+i, y+j, bg);
}
}
}
@ -446,15 +431,13 @@ void Adafruit_GFX::drawXBitmap(int16_t x, int16_t y,
const uint8_t *bitmap, int16_t w, int16_t h, uint16_t color) {
int16_t i, j, byteWidth = (w + 7) / 8;
uint8_t bitnum, byte;
uint8_t byte;
for(j=0; j<h; j++) {
for(i=0; i<w; i++ ) {
bitnum = i & 7;
if(!bitnum) byte = pgm_read_byte(bitmap + j * byteWidth + i / 8);
if(byte & pgm_read_byte(&GFXsetBit[7-bitnum])) {
drawPixel(x+i, y+j, color);
}
if(i & 7) byte >>= 1;
else byte = pgm_read_byte(bitmap + j * byteWidth + i / 8);
if(byte & 0x01) drawPixel(x+i, y+j, color);
}
}
}
@ -587,18 +570,17 @@ void Adafruit_GFX::drawChar(int16_t x, int16_t y, unsigned char c,
for(yy=0; yy<h; yy++) {
for(xx=0; xx<w; xx++) {
if(bit == 0) {
if(!(bit++ & 7)) {
bits = pgm_read_byte(&bitmap[bo++]);
bit = 0x80;
}
if(bits & bit) {
if(bits & 0x80) {
if(size == 1) {
drawPixel(x+xo+xx, y+yo+yy, color);
} else {
fillRect(x+(xo16+xx)*size, y+(yo16+yy)*size, size, size, color);
}
}
bit >>= 1;
bits <<= 1;
}
}
@ -969,6 +951,11 @@ uint8_t* GFXcanvas1::getBuffer(void) {
}
void GFXcanvas1::drawPixel(int16_t x, int16_t y, uint16_t color) {
// Bitmask tables of 0x80>>X and ~(0x80>>X), because X>>Y is slow on AVR
static const uint8_t PROGMEM
GFXsetBit[] = { 0x80, 0x40, 0x20, 0x10, 0x08, 0x04, 0x02, 0x01 },
GFXclrBit[] = { 0x7F, 0xBF, 0xDF, 0xEF, 0xF7, 0xFB, 0xFD, 0xFE };
if(buffer) {
if((x < 0) || (y < 0) || (x >= _width) || (y >= _height)) return;