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Add fastBlend to improve RP2040 performance

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Bodmer
2023-10-13 18:47:32 +01:00
parent 3ff6895658
commit 3dc190df6c
2 changed files with 23 additions and 9 deletions
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18
TFT_eSPI.cpp
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@ -3954,7 +3954,7 @@ constexpr float deg2rad = 3.14159265359/180.0;
uint16_t TFT_eSPI::drawPixel(int32_t x, int32_t y, uint32_t color, uint8_t alpha, uint32_t bg_color)
{
if (bg_color == 0x00FFFFFF) bg_color = readPixel(x, y);
color = alphaBlend(alpha, color, bg_color);
color = fastBlend(alpha, color, bg_color);
drawPixel(x, y, color);
return color;
}
@ -4195,7 +4195,7 @@ void TFT_eSPI::drawArc(int32_t x, int32_t y, int32_t r, int32_t ir,
if (alpha < 16) continue; // Skip low alpha pixels
// If background is read it must be done in each quadrant
uint16_t pcol = alphaBlend(alpha, fg_color, bg_color);
uint16_t pcol = fastBlend(alpha, fg_color, bg_color);
// Check if an AA pixels need to be drawn
slope = ((r - cy)<<16)/(r - cx);
if (slope <= startSlope[0] && slope >= endSlope[0]) // BL
@ -4366,7 +4366,7 @@ void TFT_eSPI::drawSmoothRoundRect(int32_t x, int32_t y, int32_t r, int32_t ir,
if (alpha < 16) continue; // Skip low alpha pixels
// If background is read it must be done in each quadrant - TODO
uint16_t pcol = alphaBlend(alpha, fg_color, bg_color);
uint16_t pcol = fastBlend(alpha, fg_color, bg_color);
if (quadrants & 0x8) drawPixel(x + cx - r, y - cy + r + h, pcol); // BL
if (quadrants & 0x1) drawPixel(x + cx - r, y + cy - r, pcol); // TL
if (quadrants & 0x2) drawPixel(x - cx + r + w, y + cy - r, pcol); // TR
@ -4522,12 +4522,12 @@ void TFT_eSPI::drawWedgeLine(float ax, float ay, float bx, float by, float ar, f
bg = readPixel(xp, yp); swin = true;
}
#ifdef GC9A01_DRIVER
uint16_t pcol = alphaBlend((uint8_t)(alpha * PixelAlphaGain), fg_color, bg);
uint16_t pcol = fastBlend((uint8_t)(alpha * PixelAlphaGain), fg_color, bg);
drawPixel(xp, yp, pcol);
swin = swin;
#else
if (swin) { setWindow(xp, yp, x1, yp); swin = false; }
pushColor(alphaBlend((uint8_t)(alpha * PixelAlphaGain), fg_color, bg));
pushColor(fastBlend((uint8_t)(alpha * PixelAlphaGain), fg_color, bg));
#endif
}
}
@ -4560,12 +4560,12 @@ void TFT_eSPI::drawWedgeLine(float ax, float ay, float bx, float by, float ar, f
bg = readPixel(xp, yp); swin = true;
}
#ifdef GC9A01_DRIVER
uint16_t pcol = alphaBlend((uint8_t)(alpha * PixelAlphaGain), fg_color, bg);
uint16_t pcol = fastBlend((uint8_t)(alpha * PixelAlphaGain), fg_color, bg);
drawPixel(xp, yp, pcol);
swin = swin;
#else
if (swin) { setWindow(xp, yp, x1, yp); swin = false; }
pushColor(alphaBlend((uint8_t)(alpha * PixelAlphaGain), fg_color, bg));
pushColor(fastBlend((uint8_t)(alpha * PixelAlphaGain), fg_color, bg));
#endif
}
}
@ -4719,7 +4719,7 @@ void TFT_eSPI::fillRectVGradient(int16_t x, int16_t y, int16_t w, int16_t h, uin
while (h--) {
drawFastHLine(x, y++, w, color);
alpha += delta;
color = alphaBlend((uint8_t)alpha, color1, color2);
color = fastBlend((uint8_t)alpha, color1, color2);
}
end_nin_write();
@ -4757,7 +4757,7 @@ void TFT_eSPI::fillRectHGradient(int16_t x, int16_t y, int16_t w, int16_t h, uin
while (w--) {
drawFastVLine(x++, y, h, color);
alpha += delta;
color = alphaBlend((uint8_t)alpha, color1, color2);
color = fastBlend((uint8_t)alpha, color1, color2);
}
end_nin_write();

14
TFT_eSPI.h
View File

@ -985,6 +985,20 @@ class TFT_eSPI : public Print { friend class TFT_eSprite; // Sprite class has ac
template <typename T> static inline void
transpose(T& a, T& b) { T t = a; a = b; b = t; }
// Fast alphaBlend
template <typename A, typename F, typename B> static inline uint16_t
fastBlend(A alpha, F fgc, B bgc)
{
// Split out and blend 5 bit red and blue channels
uint32_t rxb = bgc & 0xF81F;
rxb += ((fgc & 0xF81F) - rxb) * (alpha >> 2) >> 6;
// Split out and blend 6 bit green channel
uint32_t xgx = bgc & 0x07E0;
xgx += ((fgc & 0x07E0) - xgx) * alpha >> 8;
// Recombine channels
return (rxb & 0xF81F) | (xgx & 0x07E0);
}
/***************************************************************************************
** Section 10: Additional extension classes
***************************************************************************************/