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This is a bare-bones graphics library. It is intended for a few
simple tasks:
1) Load a graphics file and return the image as a width, height, and
unsigned char array of RGB values. Here's the prototype:
int read_image(char *filename, int *width, int *height,
unsigned char **rgb);
2) Resize an image supplied as a width, height, and unsigned char
array of RGB values to a new width and height. Here's the
prototype:
int resize_image(unsigned char **rgb, int in_width, int in_height,
int out_width, int out_height, int bilinear);
If bilinear is 1, resize_image will use bilinear interpolation when
scaling the image. If bilinear is 0, resize_image will use the
nearest_neighbor method when scaling the image. This is much
faster and frequently good enough.
3) Save an image supplied as a width, height, and unsigned char
array of RGB values to a graphics file. Here's the prototype:
int write_image(char *filename, int width, int height,
unsigned char *rgb);
4) Crop an image. Here's the prototype:
int crop_image(unsigned char **rgb, int in_width, int in_height,
int x, int y, int width, int height);
5) Delete an image. This frees the memory allocated by
read_image_file and resize_image. Here's the prototype:
int delete_image(unsigned char **rgb);
Currently the file formats supported are GIF, JPEG, PNG, PNM, and
TIFF. Writing of BMP images works on little-endian machines. It
works well enough for Xplanet, but I really wouldn't use it for
anything else.
Hari Nair
hari@alumni.caltech.edu
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