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[fb] Use rep stosl for screen fill

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This is mostly cleanup after fighting the double buffering bug - bring
back rep stosl for screen fill, and move draw_pixel to be an inline
function.
This commit is contained in:
Justin C. Miller
2021-02-05 23:55:42 -08:00
parent b5885ae35f
commit 572fade7ff
2 changed files with 10 additions and 11 deletions
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15
src/drivers/fb/screen.cpp
View File

@@ -9,7 +9,8 @@ screen::screen(volatile void *addr, unsigned hres, unsigned vres, unsigned scanl
m_resx(hres),
m_resy(vres)
{
m_back = reinterpret_cast<pixel_t*>(malloc(scanline*vres*sizeof(pixel_t)));
const size_t size = scanline * vres;
m_back = reinterpret_cast<pixel_t*>(malloc(size * sizeof(pixel_t)));
}
screen::pixel_t
@@ -33,15 +34,9 @@ screen::color(uint8_t r, uint8_t g, uint8_t b) const
void
screen::fill(pixel_t color)
{
const size_t len = m_resx * m_resy;
for (size_t i = 0; i < len; ++i)
m_back[i] = color;
}
void
screen::draw_pixel(unsigned x, unsigned y, pixel_t color)
{
m_back[x + y * m_resx] = color;
const size_t len = m_scanline * m_resy;
asm volatile ( "rep stosl" : :
"a"(color), "c"(len), "D"(m_back) );
}
void

6
src/drivers/fb/screen.h
View File

@@ -17,7 +17,11 @@ public:
pixel_t color(uint8_t r, uint8_t g, uint8_t b) const;
void fill(pixel_t color);
void draw_pixel(unsigned x, unsigned y, pixel_t color);
inline void draw_pixel(unsigned x, unsigned y, pixel_t color) {
const size_t index = x + y * m_scanline;
m_back[index] = color;
}
void update();