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add fb_width(), fb_height()

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This commit is contained in:
Josh Holtrop 2020-10-20 20:06:54 -04:00
parent 784009ba6c
commit 494ef6de81
2 changed files with 34 additions and 20 deletions
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52
src/fb.c
View File

@ -2,10 +2,12 @@
#include <stddef.h>
#include "mem.h"
static uint32_t * fb;
static uint32_t fb_width;
static uint32_t fb_height;
static uint32_t fb_pitch;
static struct {
uint32_t * addr;
uint32_t width;
uint32_t height;
uint32_t pitch;
} fb;
static inline uint32_t build_pixel(uint8_t r, uint8_t g, uint8_t b)
{
@ -14,31 +16,41 @@ static inline uint32_t build_pixel(uint8_t r, uint8_t g, uint8_t b)
static inline void fb_set_pixel(int x, int y, uint8_t r, uint8_t g, uint8_t b)
{
fb[fb_pitch * y / 4u + x] = build_pixel(r, g, b);
fb.addr[fb.pitch * y / 4u + x] = build_pixel(r, g, b);
}
static void fb_clear(void)
{
memset32(fb, 0x002C55u, fb_pitch * fb_height / 4u);
memset32(fb.addr, 0x002C55u, fb.pitch * fb.height / 4u);
}
void fb_init(uint32_t * addr, uint32_t width, uint32_t height, uint32_t pitch)
{
fb = addr;
fb_width = width;
fb_height = height;
fb_pitch = pitch;
fb.addr = addr;
fb.width = width;
fb.height = height;
fb.pitch = pitch;
fb_clear();
}
bool fb_ready(void)
{
return fb != NULL;
return fb.addr != NULL;
}
uint32_t fb_width(void)
{
return fb.width;
}
uint32_t fb_height(void)
{
return fb.height;
}
void fb_blend_alpha8(const uint8_t * bitmap, int width, int height, int pitch, int x, int y, uint8_t r, uint8_t g, uint8_t b)
{
if (((x + width) <= 0) || (x >= (int)fb_width) || ((y + height) <= 0) || (y >= (int)fb_height))
if (((x + width) <= 0) || (x >= (int)fb.width) || ((y + height) <= 0) || (y >= (int)fb.height))
{
return;
}
@ -54,15 +66,15 @@ void fb_blend_alpha8(const uint8_t * bitmap, int width, int height, int pitch, i
bitmap += ((-y) * pitch);
y = 0;
}
if ((x + width) > (int)fb_width)
if ((x + width) > (int)fb.width)
{
width = (int)fb_width - x;
width = (int)fb.width - x;
}
if ((y + height) > (int)fb_height)
if ((y + height) > (int)fb.height)
{
height = (int)fb_height - y;
height = (int)fb.height - y;
}
uint32_t * target = &fb[fb_pitch * y / 4u + x];
uint32_t * target = &fb.addr[fb.pitch * y / 4u + x];
for (int row = 0; row < height; row++)
{
for (int col = 0; col < width; col++)
@ -83,17 +95,17 @@ void fb_blend_alpha8(const uint8_t * bitmap, int width, int height, int pitch, i
target[col] = pixel;
}
bitmap += pitch;
target += (fb_pitch / 4u);
target += (fb.pitch / 4u);
}
}
void fb_fill(int x, int y, int width, int height, uint8_t r, uint8_t g, uint8_t b)
{
uint32_t * target = &fb[fb_pitch * y / 4u + x];
uint32_t * target = &fb.addr[fb.pitch * y / 4u + x];
uint32_t pixel = build_pixel(r, g, b);
for (int row = 0; row < height; row++)
{
memset32(target, pixel, width);
target += fb_pitch / 4u;
target += fb.pitch / 4u;
}
}

2
src/fb.h
View File

@ -6,6 +6,8 @@
void fb_init(uint32_t * addr, uint32_t width, uint32_t height, uint32_t pitch);
bool fb_ready(void);
uint32_t fb_width(void);
uint32_t fb_height(void);
void fb_blend_alpha8(const uint8_t * bitmap, int width, int height, int pitch, int x, int y, uint8_t r, uint8_t g, uint8_t b);
void fb_fill(int x, int y, int width, int height, uint8_t r, uint8_t g, uint8_t b);