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[ili9xxx] Improve fill operation performance (#4702)
Co-authored-by: Your Name <you@example.com>
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@ -84,10 +84,19 @@ void ILI9XXXDisplay::fill(Color color) {
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break;
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case BITS_16:
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new_color = display::ColorUtil::color_to_565(color);
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for (uint32_t i = 0; i < this->get_buffer_length_() * 2; i = i + 2) {
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{
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const uint32_t buffer_length_16_bits = this->get_buffer_length_() * 2;
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if (((uint8_t) (new_color >> 8)) == ((uint8_t) new_color)) {
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// Upper and lower is equal can use quicker memset operation. Takes ~20ms.
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memset(this->buffer_, (uint8_t) new_color, buffer_length_16_bits);
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} else {
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// Slower set of both buffers. Takes ~30ms.
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for (uint32_t i = 0; i < buffer_length_16_bits; i = i + 2) {
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this->buffer_[i] = (uint8_t) (new_color >> 8);
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this->buffer_[i + 1] = (uint8_t) new_color;
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}
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}
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}
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return;
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break;
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default:
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