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⚡️ Faster COMPACT_MARLIN_BOOT_LOGO (rle16) (#26153)

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ellensp 2023-10-28 11:15:23 +13:00 • committed by GitHub
parent c666b492c4
commit b082f1a2b8
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1 changed files with 25 additions and 0 deletions
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25
Marlin/src/lcd/tft/canvas.cpp
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@ -129,6 +129,13 @@ void Canvas::addImage(int16_t x, int16_t y, MarlinImage image, uint16_t *colors)
}
#if ENABLED(COMPACT_MARLIN_BOOT_LOGO)
static struct {
bool has_rle_state = false;
int16_t dstx, dsty, srcx, srcy;
uint32_t rle_offset;
} rle_state;
// RLE16 HIGHCOLOR - 16 bits per pixel
if (color_mode == RLE16) {
uint8_t *bytedata = (uint8_t *)images[image].data;
@ -139,8 +146,25 @@ void Canvas::addImage(int16_t x, int16_t y, MarlinImage image, uint16_t *colors)
dsty = y, dstx = x; // Destination line / column index
uint16_t color = 0; // Persist the last fetched color value
if (rle_state.has_rle_state) { // do we have RLE position data?
rle_state.has_rle_state = false; // invalidate stored RLE state
dstx = rle_state.dstx; // restore required states
dsty = rle_state.dsty;
srcx = rle_state.srcx;
srcy = rle_state.srcy;
bytedata = (uint8_t *)images[image].data + rle_state.rle_offset; // Restart decode from here instead of the start of data
}
bool done = false;
while (!done) {
if (dsty >= endLine - 1 || srcy >= image_height - 1) { // Store state?
rle_state.dstx = dstx; // Save required states
rle_state.dsty = dsty;
rle_state.srcx = srcx;
rle_state.srcy = srcy;
rle_state.rle_offset = bytedata - (uint8_t *)images[image].data;; // Keep these for skipping full RLE decode on future iteratons
}
uint8_t count = *bytedata++; // Get the count byte
const bool uniq = bool(count & 0x80); // >= 128 is a distinct run; < 128 is a repeat run
count = (count & 0x7F) + 1; // Actual count is 7-bit plus 1
@ -169,6 +193,7 @@ void Canvas::addImage(int16_t x, int16_t y, MarlinImage image, uint16_t *colors)
srcx = 0; dstx = x; // May be shifted within the canvas, but usually not
if (dsty >= endLine || srcy >= image_height) { // Done with the segment or the image?
done = true; // Set a flag to end the loop...
rle_state.has_rle_state = true; // RLE state is stored
break; // ...and break out of while(count--)
}
}