fb.c

#include "fb.h"

#include <stdlib.h>

#include "mailbox.h"

void *fb_create(uint32_t width, uint32_t height, uint32_t depth)
{
    PropertyMessageTag tags[4];
    tags[0].tag = FB_SET_PHYSICAL_SIZE;
    tags[0].value.fbScreenSize.width = width;
    tags[0].value.fbScreenSize.height = height;
    tags[1].tag = FB_SET_VIRTUAL_SIZE;
    tags[1].value.fbScreenSize.width = width;
    tags[1].value.fbScreenSize.height = height;
    tags[2].tag = FB_SET_DEPTH;
    tags[2].value.fbBitsPerPixel = depth;
    tags[3].tag = NULL_TAG;
    if (mailbox_send_messages(tags) != 0) {
        return NULL;
    }

    tags[0].tag = FB_ALLOCATE_TAG;
    tags[0].value.fbScreenSize.width = 0;
    tags[0].value.fbScreenSize.height = 0;
    tags[0].value.fbAllocateAlignment = 16;
    tags[1].tag = NULL_TAG;
    if (mailbox_send_messages(tags) != 0) {
        return NULL;
    }

    return (void *) tags[0].value.fbAllocateRes.base;
}

void fb_putc(uint32_t *fb,
             int width,
             int height,
             const uint8_t *font,
             int x,
             int y)
{
    (void) height;

    for (int j = 0; j < 16; ++j) {
        for (int i = 0; i < 8; ++i) {
            if (font[j] & (1 << i)) {
                fb[(y + j) * width + (x + i)] = 0xFFFFFFFF;
            }
        }
    }
}

void fb_puts(uint32_t *fb,
             int width,
             int height,
             const uint8_t (*font)[16],
             const char *str,
             int x,
             int y)
{
    for (int i = 0; str[i] != '\0'; ++i) {
        fb_putc(fb, width, height, font[(uint8_t) str[i]], x + 8 * i, y);
    }
}