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Draw 16-bit images faster - #11633
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A 16-bit Bitmap shown through an RGB565 ColorConverter without dithering reaches a 16-bit display unchanged apart from byte order, so it can take the existing row fast path instead of converting each pixel. Runs of 32 pixels not yet drawn are copied as a block when no transparent color is set. A full-screen 800x480 Bitmap on the ESP32-S31-Korvo-1 refreshes in about 35 ms instead of 255 ms. Co-Authored-By: Claude Opus 5.5 (1M context) <noreply@anthropic.com>
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What
16-bit Bitmaps draw faster when colors need no conversion.
Why
Full-screen photos and video refresh slowly on large displays.
Measured on ESP32-S31-Korvo-1 with #11630 applied.
ColorConverterwithRGB565orRGB565_SWAPPED, no dither, 16-bit display, no scale, flip or transposedisplay.refresh()afterbitmap.fill(), ESP32-S31-Korvo-1, median of 10 (min to max)RGB565_SWAPPEDRGB565Palette(256)RGB565_SWAPPEDRGB565The Palette loop is unchanged; its timing shows no slowdown.
Not tested on SPI displays.
AI assistance: written with Claude Code. I ran the hardware tests above.