43 lines
1.5 KiB
C++
43 lines
1.5 KiB
C++
/******************************************************************************
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* Copyright (c) 2018(-2023) STMicroelectronics.
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* All rights reserved.
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*
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* This file is part of the TouchGFX 4.21.2 distribution.
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*
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* This software is licensed under terms that can be found in the LICENSE file in
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* the root directory of this software component.
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* If no LICENSE file comes with this software, it is provided AS-IS.
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*
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*******************************************************************************/
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#include <touchgfx/lcd/LCD.hpp>
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#include <touchgfx/widgets/canvas/PainterXRGB8888.hpp>
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namespace touchgfx
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{
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void PainterXRGB8888::paint(uint8_t* destination, int16_t offset, int16_t /*widgetX*/, int16_t /*widgetY*/, int16_t count, uint8_t alpha) const
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{
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uint32_t* RESTRICT framebuffer = reinterpret_cast<uint32_t*>(destination) + offset;
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const uint32_t* const lineEnd = framebuffer + count;
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if (alpha == 0xFF)
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{
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do
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{
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*framebuffer = painterColor;
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} while (++framebuffer < lineEnd);
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}
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else
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{
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do
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{
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const uint8_t ialpha = 0xFF - alpha;
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const uint32_t rgbBg = *framebuffer;
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*framebuffer = (LCD::div255(painterBlue * alpha + (rgbBg & 0xFF) * ialpha)) |
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(LCD::div255(painterGreen * alpha + ((rgbBg >> 8) & 0xFF) * ialpha) << 8) |
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(LCD::div255(painterRed * alpha + ((rgbBg >> 16) & 0xFF) * ialpha) << 16);
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} while (++framebuffer < lineEnd);
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}
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}
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} // namespace touchgfx
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