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Arduboy2
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Make bit buffers smaller

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Pharap 2017-12-24 16:42:20 +00:00 committed by GitHub
parent 737a7a63e8
commit f4995b79ea
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GPG Key ID: 4AEE18F83AFDEB23
1 changed files with 5 additions and 5 deletions
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10
src/Arduboy2.cpp
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@ -849,11 +849,11 @@ void Arduboy2Base::drawSlowXYBitmap
struct BitStreamReader { struct BitStreamReader {
const uint8_t *source; const uint8_t *source;
uint16_t sourceIndex; uint16_t sourceIndex;
uint16_t bitBuffer; uint8_t bitBuffer;
uint8_t byteBuffer; uint8_t byteBuffer;
BitStreamReader(const uint8_t *source) BitStreamReader(const uint8_t *source)
: source(source), sourceIndex(), bitBuffer(0x100), byteBuffer() : source(source), sourceIndex(), bitBuffer(), byteBuffer()
{ {
} }
@ -862,7 +862,7 @@ struct BitStreamReader {
uint16_t result = 0; uint16_t result = 0;
for (uint16_t i = 0; i < bitCount; i++) for (uint16_t i = 0; i < bitCount; i++)
{ {
if (this->bitBuffer == 0x100) if (this->bitBuffer == 0)
{ {
this->bitBuffer = 0x1; this->bitBuffer = 0x1;
this->byteBuffer = pgm_read_byte(&this->source[this->sourceIndex]); this->byteBuffer = pgm_read_byte(&this->source[this->sourceIndex]);
@ -911,7 +911,7 @@ void Arduboy2Base::drawCompressed(int16_t sx, int16_t sy, const uint8_t *bitmap,
int columnOffset = 0; int columnOffset = 0;
uint8_t byte = 0x00; uint8_t byte = 0x00;
uint16_t bit = 0x01; uint8_t bit = 0x01;
while (rowOffset < rows) // + (frame*rows)) while (rowOffset < rows) // + (frame*rows))
{ {
uint16_t bitLength = 1; uint16_t bitLength = 1;
@ -927,7 +927,7 @@ void Arduboy2Base::drawCompressed(int16_t sx, int16_t sy, const uint8_t *bitmap,
byte |= bit; byte |= bit;
bit <<= 1; bit <<= 1;
if (bit == 0x100) // reached end of byte if (bit == 0) // reached end of byte
{ {
// draw // draw
int bRow = startRow + rowOffset; int bRow = startRow + rowOffset;