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/*
* Copyright (c) 2023-2025 Ian Marco Moffett and the Osmora Team.
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
*
* 1. Redistributions of source code must retain the above copyright notice,
* this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. Neither the name of Hyra nor the names of its
* contributors may be used to endorse or promote products derived from
* this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*/
#include <sys/errno.h>
#include <stdint.h>
#include <libgfx/gfx.h>
#include <libgfx/draw.h>
/*
* See if a pixel is within the bounds of
* the screen.
*
* @ctx: Graphics context pointer
* @x: X position to check
* @y: Y position to check
*
* Returns 0 if within bounds, otherwise
* a negative value.
*/
static int
gfx_pixel_bounds(struct gfx_ctx *ctx, uint32_t x, uint32_t y)
{
scrpos_t scr_width, scr_height;
struct fbattr fbdev;
if (ctx == NULL) {
return -1;
}
/* Grab screen dimensions */
fbdev = ctx->fbdev;
scr_width = fbdev.width;
scr_height = fbdev.height;
if (x >= scr_height || y >= scr_width) {
return -1;
}
return 0;
}
/*
* Draw a classic square onto the screen.
*
* @ctx: Graphics context
* @shape: Square to draw
*/
static int
gfx_draw_square(struct gfx_ctx *ctx, const struct gfx_shape *shape)
{
struct fbattr fbdev;
off_t idx;
scrpos_t x, y;
if (ctx == NULL || shape == NULL) {
return -EINVAL;
}
for (x = shape->x; x < shape->x + shape->width; ++x) {
for (y = shape->y; y < shape->y + shape->height; ++y) {
if (gfx_pixel_bounds(ctx, x, y) < 0) {
break;
}
idx = gfx_io_index(ctx, x, y);
ctx->io[idx] = shape->color;
}
}
return 0;
}
/*
* Plot a single pixel (aka point) onto
* the screen.
*
* @ctx: The graphics context pointer
* @point: Point to plot
*
* Returns 0 on success, otherwise a less
* than zero value.
*/
int
gfx_plot_point(struct gfx_ctx *ctx, const struct gfx_point *point)
{
uint32_t index;
if (ctx == NULL || point == NULL) {
return -EINVAL;
}
/*
* Is this even a valid point on the screen for
* us to plot on?
*/
if (gfx_pixel_bounds(ctx, point->x, point->y) < 0) {
return -1;
}
/* Plot it !! */
index = gfx_io_index(ctx, point->x, point->y);
ctx->io[index] = point->rgb;
return 0;
}
/*
* Draw a shape onto the screen
*
* @ctx: libgfx graphics context
* @shape: Shape to draw
*
* Returns 0 on success, otherwise a less than zero
* value on failure.
*
* All error codes follow POSIX errno. However if the value
* is -1, the requested shape to be drawn is not valid.
*/
int
gfx_draw_shape(struct gfx_ctx *ctx, const struct gfx_shape *shape)
{
if (ctx == NULL || shape == NULL) {
return -EINVAL;
}
switch (shape->type) {
case SHAPE_SQUARE:
return gfx_draw_square(ctx, shape);
}
return -1;
}
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