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Hub75: Reformat loop for performance. 

~3.09ms to ~2.87ms per frame without overclock.
unicorn-test
Mike Bell 2024-11-21 22:08:08 +00:00 zatwierdzone przez Phil Howard
rodzic 50d5a39fa9
commit ff101767cd
1 zmienionych plików z 35 dodań i 26 usunięć
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61
drivers/hub75/hub75.cpp
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@ -280,40 +280,49 @@ void Hub75::update(PicoGraphics *graphics) {
uint8_t *p = (uint8_t *)graphics->frame_buffer;
if(graphics->bounds.w == int32_t(width / 2) && graphics->bounds.h == int32_t(height * 2)) {
for(int y = 0; y < graphics->bounds.h; y++) {
int offsety = 0;
int sy = y;
int basex = 0;
// Assuming our canvas is 128x128 and our display is 256x64,
// consisting of 2x128x64 panels, remap the bottom half
// of the canvas to the right-half of the display,
// This gives us an optional square arrangement.
if (sy >= int(height)) {
sy -= height;
basex = width / 2;
} else {
// Awkward hack to *TEMPORARILY* rotate the top panel
sy = height - 1 - sy;
basex = (width / 2) - 1;
}
// Interlace the top and bottom halves of the panel.
// Since these are scanned out simultaneously to two chains
// of shift registers we need each pair of rows
// (N and N + height / 2) to be adjacent in the buffer.
offsety = width * 2;
if(sy >= int(height / 2)) {
sy -= height / 2;
offsety *= sy;
offsety += 1;
} else {
offsety *= sy;
}
for(int x = 0; x < graphics->bounds.w; x++) {
int offset = 0;
int sy = y;
int sx = x;
uint8_t b = *p++;
uint8_t g = *p++;
uint8_t r = *p++;
// Assuming our canvas is 128x128 and our display is 256x64,
// consisting of 2x128x64 panels, remap the bottom half
// of the canvas to the right-half of the display,
// This gives us an optional square arrangement.
if (sy >= int(height)) {
sy -= height;
sx += width / 2;
// Assumes width / 2 is even.
if (basex & 1) {
sx = basex - sx;
} else {
// Awkward hack to *TEMPORARILY* rotate the top panel
sy = height - 1 - sy;
sx = (width / 2) - 1 - sx;
sx += basex;
}
// Interlace the top and bottom halves of the panel.
// Since these are scanned out simultaneously to two chains
// of shift registers we need each pair of rows
// (N and N + height / 2) to be adjacent in the buffer.
offset = width * 2;
if(sy >= int(height / 2)) {
sy -= height / 2;
offset *= sy;
offset += 1;
} else {
offset *= sy;
}
offset += sx * 2;
int offset = offsety + sx * 2;
back_buffer[offset] = (GAMMA_10BIT[b] << b_shift) | (GAMMA_10BIT[g] << g_shift) | (GAMMA_10BIT[r] << r_shift);