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/**
******************************************************************************
* This file is part of the TouchGFX 4.10.0 distribution.
*
* @attention
*
* Copyright (c) 2018 STMicroelectronics.
* All rights reserved.
*
* This software is licensed under terms that can be found in the LICENSE file
* in the root directory of this software component.
* If no LICENSE file comes with this software, it is provided AS-IS.
*
******************************************************************************
*/
#include <gui/graph_screen/PainterVerticalAlpha.hpp>
#include <touchgfx/Color.hpp>
using namespace touchgfx;
PainterVerticalAlpha::PainterVerticalAlpha(colortype color /*= 0*/, int alpha0atY /*= 100*/)
{
setColor(color, alpha0atY);
}
void PainterVerticalAlpha::setColor(colortype color, int alphaZeroAt)
{
#if !defined(USE_BPP) || USE_BPP==16 || USE_BPP==24
painterRed = Color::getRedColor(color);
painterGreen = Color::getGreenColor(color);
painterBlue = Color::getBlueColor(color);
#elif USE_BPP==4 || USE_BPP==2
painterGray = (uint8_t)color;
#else
#error Unknown USE_BPP
#endif
alpha0atY = alphaZeroAt;
}
bool PainterVerticalAlpha::renderInit()
{
int gradientAlpha = 255 - (currentY * 255 / alpha0atY);
if (gradientAlpha < 0)
{
gradientAlpha = 0;
}
if (gradientAlpha > 255)
{
gradientAlpha = 255;
}
painterAlpha = gradientAlpha;
return true;
}
void PainterVerticalAlpha::render(uint8_t* ptr, int x, int xAdjust, int y, unsigned count, const uint8_t* covers)
{
currentY = y + areaOffsetY;
renderInit(); // re-use code to set painterAlpha
#if !defined(USE_BPP) || USE_BPP==16 || USE_BPP==24
#if !defined(USE_BPP) || USE_BPP==16
uint16_t* p = reinterpret_cast<uint16_t*>(ptr) + (x + xAdjust);
currentX = x + areaOffsetX; // CurrentX is not used in 24bpp
#else
uint8_t* p = ptr + ((x + xAdjust) * 3);
#endif
uint8_t totalAlpha = (widgetAlpha * painterAlpha) / 255u;
do
{
uint32_t combinedAlpha = (*covers) * totalAlpha;
covers++;
#if !defined(USE_BPP) || USE_BPP==16
uint8_t p_red = (*p & RMASK) >> 8;
uint8_t p_green = (*p & GMASK) >> 3;
uint8_t p_blue = (*p & BMASK) << 3;
uint8_t pixelRed = static_cast<uint8_t>((((painterRed - p_red) * combinedAlpha) >> 16) + p_red);
uint8_t pixelGreen = static_cast<uint8_t>((((painterGreen - p_green) * combinedAlpha) >> 16) + p_green);
uint8_t pixelBlue = static_cast<uint8_t>((((painterBlue - p_blue) * combinedAlpha) >> 16) + p_blue);
#define fastrand(g_seed) ((214013*(uint32_t)(g_seed)+2531011)>>16)
uint8_t rand = fastrand((currentX + *p) * (currentY + *p));
if (pixelRed < 0xF8)
{
pixelRed = pixelRed + ((rand >> 5)); // Add bit 7-5 of rand to red to get rounding
}
if (pixelGreen < 0xFC)
{
pixelGreen = pixelGreen + ((rand >> 3) & 0x3); // Add bit 4-3 of rand to green to get rounding
}
if (pixelBlue < 0xF8)
{
pixelBlue = pixelBlue + ((rand) & 0x7); // Add bit 2-0 of rand to blue to get rounding
}
*p++ = ((pixelRed << 8) & RMASK) | ((pixelGreen << 3) & GMASK) | ((pixelBlue >> 3) & BMASK);
currentX++;
#else
uint8_t pixelBlue = static_cast<uint8_t>((((painterBlue - *p) * combinedAlpha) >> 16) + *p);
*p++ = pixelBlue;
uint8_t pixelGreen = static_cast<uint8_t>((((painterGreen - *p) * combinedAlpha) >> 16) + *p);
*p++ = pixelGreen;
uint8_t pixelRed = static_cast<uint8_t>((((painterRed - *p) * combinedAlpha) >> 16) + *p);
*p++ = pixelRed;
#endif
}
while (--count != 0);
#elif USE_BPP==4
x += xAdjust;
uint8_t totalAlpha = (widgetAlpha * painterAlpha) / 255u;
do
{
uint16_t combinedAlpha = (*covers) * totalAlpha;
covers++;
if (combinedAlpha != 0)
{
uint8_t p_gray = LCD4getPixel(ptr, x);
LCD4setPixel(ptr, x, static_cast<uint8_t>((((painterGray - p_gray) * combinedAlpha) >> 16) + p_gray));
}
x++;
}
while (--count != 0);
#elif USE_BPP==2
x += xAdjust;
uint8_t totalAlpha = (widgetAlpha * painterAlpha) / 255u;
do
{
uint8_t combinedAlpha = (*covers) * totalAlpha;
covers++;
if (combinedAlpha != 0)
{
uint8_t p_gray = LCD2getPixel(ptr, x);
LCD2setPixel(ptr, x, static_cast<uint8_t>((((painterGray - p_gray) * combinedAlpha) >> 16) + p_gray));
}
x++;
}
while (--count != 0);
#else
#error Unknown USE_BPP
#endif
}
#if !defined(USE_BPP) || USE_BPP==16 || USE_BPP==24
bool PainterVerticalAlpha::renderNext(uint8_t& pixelRed, uint8_t& pixelGreen, uint8_t& pixelBlue, uint8_t& pixelAlpha)
{
return false;
}
#elif USE_BPP==4 || USE_BPP==2
bool PainterVerticalAlpha::renderNext(uint8_t& pixelGray, uint8_t& pixelAlpha)
{
return false;
}
#else
#error Unknown USE_BPP
#endif