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Arduboy2
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Minor source format changes for drawCompressed() 

No code changes from previous commit.
This commit is contained in:
Scott Allen 2018-01-17 13:56:25 -05:00
parent 6f6849a5bb
commit d44b89e01f
1 changed files with 12 additions and 13 deletions
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25
src/Arduboy2.cpp
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@ -846,17 +846,19 @@ void Arduboy2Base::drawSlowXYBitmap
}
struct BitStreamReader {
// Helper for drawCompressed()
struct BitStreamReader
{
const uint8_t *source;
uint16_t sourceIndex;
uint8_t bitBuffer;
uint8_t byteBuffer;
BitStreamReader(const uint8_t *source)
: source(source), sourceIndex(), bitBuffer(), byteBuffer()
{
}
uint16_t readBits(uint16_t bitCount)
{
uint16_t result = 0;
@ -868,25 +870,22 @@ struct BitStreamReader {
this->byteBuffer = pgm_read_byte(&this->source[this->sourceIndex]);
++this->sourceIndex;
}
if ((this->byteBuffer & this->bitBuffer) != 0)
result |= (1 << i); // result |= bitshift_left[i];
this->bitBuffer <<= 1;
}
return result;
}
};
void Arduboy2Base::drawCompressed(int16_t sx, int16_t sy, const uint8_t *bitmap, uint8_t color)
{
// set up decompress state
BitStreamReader cs = BitStreamReader(bitmap);
// read header
int width = (int)cs.readBits(8) + 1;
int height = (int)cs.readBits(8) + 1;
uint8_t spanColour = (uint8_t)cs.readBits(1); // starting colour
@ -896,7 +895,6 @@ void Arduboy2Base::drawCompressed(int16_t sx, int16_t sy, const uint8_t *bitmap,
return;
// sy = sy - (frame * height);
int yOffset = abs(sy) % 8;
int startRow = sy / 8;
if (sy < 0) {
@ -909,7 +907,7 @@ void Arduboy2Base::drawCompressed(int16_t sx, int16_t sy, const uint8_t *bitmap,
int rowOffset = 0; // +(frame*rows);
int columnOffset = 0;
uint8_t byte = 0x00;
uint8_t bit = 0x01;
while (rowOffset < rows) // + (frame*rows))
@ -933,14 +931,15 @@ void Arduboy2Base::drawCompressed(int16_t sx, int16_t sy, const uint8_t *bitmap,
int bRow = startRow + rowOffset;
//if (byte) // possible optimisation
if ((bRow <= (HEIGHT / 8) - 1) && (bRow > -2) && (columnOffset + sx <= (WIDTH - 1)) && (columnOffset + sx >= 0))
if ((bRow <= (HEIGHT / 8) - 1) && (bRow > -2) &&
(columnOffset + sx <= (WIDTH - 1)) && (columnOffset + sx >= 0))
{
int16_t offset = (bRow * WIDTH) + sx + columnOffset;
if (bRow >= 0)
{
int16_t index = offset;
uint8_t value = byte << yOffset;
if (color != 0)
sBuffer[index] |= value;
else
@ -950,7 +949,7 @@ void Arduboy2Base::drawCompressed(int16_t sx, int16_t sy, const uint8_t *bitmap,
{
int16_t index = offset + WIDTH;
uint8_t value = byte >> (8 - yOffset);
if (color != 0)
sBuffer[index] |= value;
else