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PicoGraphics: Simplify RGB565 frame convert. 

Rewrite RGB565 frame convert to iterate over pixels by index, and transfer the buffer when it fills.

Avoid using a bitmask so BUF_LEN can be arbitrary.
mike/fix-scanline-convert
Phil Howard 2022-09-21 11:30:09 +01:00
rodzic bb9b5b69d3
commit fc3060b640
1 zmienionych plików z 14 dodań i 14 usunięć
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libraries/pico_graphics/pico_graphics.cpp
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@ -342,22 +342,22 @@ namespace pimoroni {
const int BUF_LEN = 64; const int BUF_LEN = 64;
uint16_t row_buf[2][BUF_LEN]; uint16_t row_buf[2][BUF_LEN];
int buf_idx = 0; int buf_idx = 0;
for(auto y = 0; y < bounds.h; y++) { int buf_entry = 0;
for(auto x = 0; x < bounds.w; x++) { for(auto i = 0; i < bounds.w * bounds.h; i++) {
int buf_entry = x & (BUF_LEN - 1); row_buf[buf_idx][buf_entry] = get_next_pixel();
row_buf[buf_idx][buf_entry] = get_next_pixel(); buf_entry++;
if (buf_entry == BUF_LEN - 1) { // Transfer a filled buffer and swap to the next one
callback(row_buf[buf_idx], BUF_LEN * sizeof(RGB565)); if (buf_entry == BUF_LEN) {
buf_idx ^= 1; callback(row_buf[buf_idx], BUF_LEN * sizeof(RGB565));
} buf_idx ^= 1;
} buf_entry = 0;
}
}
if ((bounds.w & (BUF_LEN - 1)) != 0) { // Transfer any remaining pixels ( < BUF_LEN )
// Callback to the driver with the remaining row data if(buf_entry > 0) {
callback(row_buf[buf_idx], (bounds.w & (BUF_LEN - 1)) * sizeof(RGB565)); callback(row_buf[buf_idx], buf_entry * sizeof(RGB565));
buf_idx ^= 1;
}
} }
// Callback with zero length to ensure previous buffer is fully written // Callback with zero length to ensure previous buffer is fully written