sortix-mirror/libui/framebuffer.c
2024-06-22 18:25:47 +02:00

173 lines
5 KiB
C

/*
* Copyright (c) 2014, 2015 Jonas 'Sortie' Termansen.
*
* Permission to use, copy, modify, and distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
* copyright notice and this permission notice appear in all copies.
*
* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*
* framebuffer.c
* Framebuffer utilities.
*/
#include <stdbool.h>
#include <stddef.h>
#include <stdint.h>
#include <string.h>
#include "framebuffer.h"
#include "pixel.h"
#include "vgafont.h"
struct framebuffer framebuffer_crop(struct framebuffer fb,
size_t left,
size_t top,
size_t width,
size_t height)
{
// Crop the framebuffer horizontally.
if ( fb.xres < left )
left = fb.xres;
fb.buffer += left;
fb.xres -= left;
if ( width < fb.xres )
fb.xres = width;
// Crop the framebuffer vertically.
if ( fb.yres < top )
top = fb.yres;
fb.buffer += top * fb.pitch;
fb.yres -= top;
if ( height < fb.yres )
fb.yres = height;
return fb;
}
void framebuffer_copy_to_framebuffer(const struct framebuffer dst,
const struct framebuffer src)
{
for ( size_t y = 0; y < src.yres; y++ )
for ( size_t x = 0; x < src.xres; x++ )
framebuffer_set_pixel(dst, x, y, framebuffer_get_pixel(src, x, y));
}
void framebuffer_copy_to_framebuffer_blend(const struct framebuffer dst,
const struct framebuffer src)
{
for ( size_t y = 0; y < src.yres; y++ )
{
for ( size_t x = 0; x < src.xres; x++ )
{
uint32_t bg = framebuffer_get_pixel(dst, x, y);
uint32_t fg = framebuffer_get_pixel(src, x, y);
framebuffer_set_pixel(dst, x, y, blend_pixel(bg, fg));
}
}
}
struct framebuffer framebuffer_crop_int(struct framebuffer fb,
int left,
int top,
int width,
int height)
{
if ( left < 0 ) { width -= -left; left = 0; }
if ( top < 0 ) { top -= -height; top -= 0; }
if ( width < 0 ) { width = 0; }
if ( height < 0 ) { height = 0; }
return framebuffer_crop(fb, left, top, width, height);
}
struct framebuffer framebuffer_cut_left_x(struct framebuffer fb, int offset)
{
fb = framebuffer_crop_int(fb, offset, 0, fb.xres - offset, fb.yres);
return fb;
}
struct framebuffer framebuffer_cut_right_x(struct framebuffer fb, int offset)
{
fb = framebuffer_crop_int(fb, 0, 0, fb.xres - offset, fb.yres);
return fb;
}
struct framebuffer framebuffer_cut_top_y(struct framebuffer fb, int offset)
{
fb = framebuffer_crop_int(fb, 0, offset, fb.xres, fb.yres - offset);
return fb;
}
struct framebuffer framebuffer_cut_bottom_y(struct framebuffer fb, int offset)
{
fb = framebuffer_crop_int(fb, 0, 0, fb.xres, fb.yres - offset);
return fb;
}
struct framebuffer framebuffer_center_x(struct framebuffer fb, int x, int width)
{
x = x - width / 2;
if ( x < 0 ) { width -= -x; x = 0; }
if ( width < 0 ) { width = 0; }
fb = framebuffer_crop(fb, x, 0, width, fb.yres);
return fb;
}
struct framebuffer framebuffer_center_y(struct framebuffer fb, int y, int height)
{
y = y - height / 2;
if ( y < 0 ) { height -= -y; y = 0; }
if ( height < 0 ) { height = 0; }
fb = framebuffer_crop(fb, 0, y, fb.xres, height);
return fb;
}
struct framebuffer framebuffer_right_x(struct framebuffer fb, int x, int width)
{
x = x - width;
if ( x < 0 ) { width -= -x; x = 0; }
if ( width < 0 ) { width = 0; }
fb = framebuffer_crop(fb, x, 0, width, fb.yres);
return fb;
}
struct framebuffer framebuffer_bottom_y(struct framebuffer fb, int y, int height)
{
y = y - height;
if ( y < 0 ) { height -= -y; y = 0; }
if ( height < 0 ) { height = 0; }
fb = framebuffer_crop(fb, 0, y, fb.xres, height);
return fb;
}
struct framebuffer framebuffer_center_text_x(struct framebuffer fb, int x, const char* str)
{
int width = (FONT_WIDTH + 1) * strlen(str);
return framebuffer_center_x(fb, x, width);
}
struct framebuffer framebuffer_center_text_y(struct framebuffer fb, int y, const char* str)
{
(void) str;
int height = FONT_HEIGHT;
return framebuffer_center_y(fb, y, height);
}
struct framebuffer framebuffer_right_text_x(struct framebuffer fb, int x, const char* str)
{
int width = (FONT_WIDTH + 1) * strlen(str);
return framebuffer_right_x(fb, x, width);
}
struct framebuffer framebuffer_bottom_text_y(struct framebuffer fb, int y, const char* str)
{
(void) str;
int height = FONT_HEIGHT;
return framebuffer_bottom_y(fb, y, height);
}