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mlx/man/man1/mlx_new_image.1

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+.TH MiniLibX 3 "September 19, 2002"
+.SH NAME
+MiniLibX - Manipulating images
+.SH SYNOPSYS
+
+.nf
+.I void *
+.fi
+.B mlx_new_image
+(
+.I void *mlx_ptr, int width, int height
+);
+
+.nf
+.I char *
+.fi
+.B mlx_get_data_addr
+(
+.I void *img_ptr, int *bits_per_pixel, int *size_line, int *endian
+);
+
+.nf
+.I int
+.fi
+.B mlx_put_image_to_window
+(
+.I void *mlx_ptr, void *win_ptr, void *img_ptr, int x, int y
+);
+
+.nf
+.I unsigned int
+.fi
+.B mlx_get_color_value
+(
+.I void *mlx_ptr, int color
+);
+
+.nf
+.I void *
+.fi
+.B mlx_xpm_to_image
+(
+.I void *mlx_ptr, char **xpm_data, int *width, int *height
+);
+
+.nf
+.I void *
+.fi
+.B mlx_xpm_file_to_image
+(
+.I void *mlx_ptr, char *filename, int *width, int *height
+);
+
+.nf
+.I int
+.fi
+.B mlx_destroy_image
+(
+.I void *mlx_ptr, void *img_ptr
+);
+
+
+.SH DESCRIPTION
+
+.B mlx_new_image
+() creates a new image in memory. It returns a
+.I void *
+identifier needed to manipulate this image later. It only needs
+the size of the image to be created, using the
+.I width
+and
+.I height
+parameters, and the
+.I mlx_ptr
+connection identifier (see the
+.B mlx
+manual).
+
+The user can draw inside the image (see below), and
+can dump the image inside a specified window at any time to
+display it on the screen. This is done using
+.B mlx_put_image_to_window
+(). Three identifiers are needed here, for the connection to the
+display, the window to use, and the image (respectively
+.I mlx_ptr
+,
+.I win_ptr
+and
+.I img_ptr
+). The (
+.I x
+,
+.I y
+) coordinates define where the image should be placed in the window.
+
+.B mlx_get_data_addr
+() returns information about the created image, allowing a user
+to modify it later. The
+.I img_ptr
+parameter specifies the image to use. The three next parameters should
+be the addresses of three different valid integers.
+.I bits_per_pixel
+will be filled with the number of bits needed to represent a pixel color
+(also called the depth of the image).
+.I size_line
+is the number of bytes used to store one line of the image in memory.
+This information is needed to move from one line to another in the image.
+.I endian
+tells you wether the pixel color in the image needs to be stored in
+little endian (
+.I endian
+== 0), or big endian (
+.I endian
+== 1).
+
+.B mlx_get_data_addr
+returns a
+.I char *
+address that represents the begining of the memory area where the image
+is stored. From this adress, the first
+.I bits_per_pixel
+bits represent the color of the first pixel in the first line of
+the image. The second group of
+.I bits_per_pixel
+bits represent the second pixel of the first line, and so on.
+Add
+.I size_line
+to the adress to get the begining of the second line. You can reach any
+pixels of the image that way.
+
+.B mlx_destroy_image
+destroys the given image (
+.I img_ptr
+).
+
+.SH STORING COLOR INSIDE IMAGES
+
+Depending on the display, the number of bits used to store a pixel color
+can change. The user usually represents a color in RGB mode, using
+one byte for each component (see
+.B mlx_pixel_put
+manual). This must be translated to fit the
+.I bits_per_pixel
+requirement of the image, and make the color understandable to the X-Server.
+That is the purpose of the
+.B mlx_get_color_value
+() function. It takes a standard RGB
+.I color
+parameter, and returns an
+.I unsigned int
+value.
+The
+.I bits_per_pixel
+least significant bits of this value can be stored in the image.
+
+Keep in mind that the least significant bits position depends on the local
+computer's endian. If the endian of the image (in fact the endian of
+the X-Server's computer) differs from the local endian, then the value should
+be transformed before being used.
+
+.SH XPM IMAGES
+
+The
+.B mlx_xpm_to_image
+() and
+.B mlx_xpm_file_to_image
+() functions will create a new image the same way.
+They will fill it using the specified
+.I xpm_data
+or
+.I filename
+, depending on which function is used.
+Note that MiniLibX does not use the standard
+Xpm library to deal with xpm images. You may not be able to
+read all types of xpm images. It however handles transparency.
+
+.SH RETURN VALUES
+The three functions that create images,
+.B mlx_new_image()
+,
+.B mlx_xpm_to_image()
+and
+.B mlx_xpm_file_to_image()
+, will return NULL if an error occurs. Otherwise they return a non-null pointer
+as an image identifier.
+
+
+.SH SEE ALSO
+mlx(3), mlx_new_window(3), mlx_pixel_put(3), mlx_loop(3)
+
+.SH AUTHOR
+Copyright ol@ - 2002-2014 - Olivier Crouzet