mlx_font.c File Reference

#include "font.h"
#include "MLX42/MLX42_Int.h"

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Functions
static void	mlx_draw_char (mlx_image_t *image, int32_t texoffset, int32_t imgoffset)
const mlx_texture_t *	mlx_get_font (void)
int32_t	mlx_get_texoffset (char c)
mlx_image_t *	mlx_put_string (mlx_t *mlx, const char *str, int32_t x, int32_t y)

Function Documentation

mlx_draw_char()

static void mlx_draw_char ( mlx_image_t *  image, int32_t  texoffset, int32_t  imgoffset  )

static

Does the actual copying of pixels form the atlas buffer to the image buffer.

Skips any non-printable characters.

Parameters

image	The image to draw on.
texture	The font_atlas.
texoffset	The character texture X offset.
imgoffset	The image X offset.

Definition at line 29 of file mlx_font.c.

{
    if (texoffset < 0)
        return;
 
    char* pixelx;
    uint8_t* pixeli;
    for (uint32_t y = 0; y < FONT_HEIGHT; y++)
    {
        pixelx = &font_atlas.pixels[(y * font_atlas.width + texoffset) * BPP];
        pixeli = image->pixels + ((y * image->width + imgoffset) * BPP);
        memcpy(pixeli, pixelx, FONT_WIDTH * BPP);
    }
}

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mlx_get_font()

const mlx_texture_t * mlx_get_font

(

void

)

Retrieve the texture data for the built-in font.

Returns

Pointer to the built-in font texture.

Definition at line 46 of file mlx_font.c.

{
    return ((const mlx_texture_t*)&font_atlas);
}

mlx_get_texoffset()

int32_t mlx_get_texoffset

(

char

c

)

This function lets you retrieve the X offset of the given char in the font texture.

NOTE: A single character is 10 * 20 in pixels!

Parameters

[in]

c

The character to get the offset from.

Returns

Non-negative if found or -1 if not found.

Definition at line 51 of file mlx_font.c.

{
    const bool _isprint = isprint(c);
 
    // NOTE: Cheesy branchless operation :D
    // +2 To skip line separator in texture
    return (-1 * !_isprint + ((FONT_WIDTH + 2) * (c - 32)) * _isprint);
}

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mlx_put_string()

mlx_image_t * mlx_put_string	(	mlx_t *	mlx,
		const char *	str,
		int32_t	x,
		int32_t	y
	)

Draws a string on an image and then outputs it to the window.

Parameters

[in]	mlx	The MLX instance handle.
[in]	str	The string to draw.
[in]	x	The X location.
[in]	y	The Y location.

Returns

Image ptr to the string.

Definition at line 60 of file mlx_font.c.

{
    MLX_NONNULL(mlx);
    MLX_NONNULL(str);
 
    mlx_image_t* strimage;
    const size_t len = strlen(str);
    if (len > MLX_MAX_STRING)
        return ((void*)mlx_error(MLX_STRTOOBIG));   
    if (!(strimage = mlx_new_image(mlx, len * FONT_WIDTH, FONT_HEIGHT)))
        return (NULL);
 
    // Draw the text itself
    int32_t imgoffset = 0;
    for (size_t i = 0; i < len; i++, imgoffset += FONT_WIDTH)
        mlx_draw_char(strimage, mlx_get_texoffset(str[i]), imgoffset);
 
    if (mlx_image_to_window(mlx, strimage, x, y) == -1)
        return (mlx_delete_image(mlx, strimage), NULL);
    return (strimage);
}

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