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Arc test (#2316)

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* Add smooth arc drawing function

Update ESP8266 architecture reference
Add pushMaskedImage() to render 16bpp images with a 1bpp mask (used for transparent PNG images plus with sprites)

New functions added using drawArc:
drawSmoothArc
drawSmoothCircle
drawSmoothRoundRect
New sqrt_fraction() added to improve smooth graphics performance on processors without a FPU (e.g. RP2040)

Faster alphaBlend() function added which retains 6bpp for green

Rename swap_coord() to transpose()

* Update TFT_eSPI.cpp

* Add arc examples
This commit is contained in:
Bodmer
2023-01-13 01:31:57 +00:00
committed by GitHub
parent ea82a7c15a
commit d37f202b94
22 changed files with 140152 additions and 125 deletions
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Extensions/Sprite.cpp
+6 -6
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@@ -1257,8 +1257,8 @@ void TFT_eSprite::pushImage(int32_t x, int32_t y, int32_t w, int32_t h, const u
// Intentionally not constrained to viewport area, does not manage 1bpp rotations
void TFT_eSprite::setWindow(int32_t x0, int32_t y0, int32_t x1, int32_t y1)
{
if (x0 > x1) swap_coord(x0, x1);
if (y0 > y1) swap_coord(y0, y1);
if (x0 > x1) transpose(x0, x1);
if (y0 > y1) transpose(y0, y1);
int32_t w = width();
int32_t h = height();
@@ -1700,13 +1700,13 @@ void TFT_eSprite::drawLine(int32_t x0, int32_t y0, int32_t x1, int32_t y1, uint3
bool steep = abs(y1 - y0) > abs(x1 - x0);
if (steep) {
swap_coord(x0, y0);
swap_coord(x1, y1);
transpose(x0, y0);
transpose(x1, y1);
}
if (x0 > x1) {
swap_coord(x0, x1);
swap_coord(y0, y1);
transpose(x0, x1);
transpose(y0, y1);
}
int32_t dx = x1 - x0, dy = abs(y1 - y0);;