/*
 * This file is part of the libpayload project.
 *
 * Copyright (C) 2015 Google, Inc.
 */

#include <libpayload.h>
#include <arch/types.h>
#include <stddef.h>

/*
 * API error codes
 */
#define CBGFX_SUCCESS			0
/* unknown error */
#define CBGFX_ERROR_UNKNOWN		1
/* failed to initialize cbgfx library */
#define CBGFX_ERROR_INIT		2
/* drawing beyond screen boundary */
#define CBGFX_ERROR_SCREEN_BOUNDARY	3
/* drawing beyond canvas boundary */
#define CBGFX_ERROR_CANVAS_BOUNDARY	4
/* bitmap error: signature mismatch */
#define CBGFX_ERROR_BITMAP_SIGNATURE	0x10
/* bitmap error: unsupported format */
#define CBGFX_ERROR_BITMAP_FORMAT	0x11
/* bitmap error: invalid data */
#define CBGFX_ERROR_BITMAP_DATA		0x12
/* bitmap error: scaling out of range */
#define CBGFX_ERROR_SCALE_OUT_OF_RANGE	0x13

struct fraction {
	int32_t nume;
	int32_t deno;
};

struct scale {
	struct fraction x;
	struct fraction y;
};

struct vector {
	union {
		int32_t x;
		int32_t width;
	};
	union {
		int32_t y;
		int32_t height;
	};
};

struct rect {
	struct vector offset;
	struct vector size;
};

struct rgb_color {
	uint8_t red;
	uint8_t green;
	uint8_t blue;
};

/*
 * Resolution of scale parameters used to describe height, width, coordinate,
 * etc. relative to the canvas. For example, if it's 100, scales range from 0 to
 * 100%.
 */
#define CANVAS_SCALE		100

/*
 * The coordinate system is expected to have (0, 0) at top left corner with
 * y values increasing towards bottom of screen.
 */

/*
 * Load a bitmap file from cbfs
 *
 * Memory is allocated automatically and it's caller's responsibility to free it
 *
 * name: name of the bitmap file
 * size: (OUT) size of the image
 *
 * return: pointer to the image data in memory or NULL on error
 */
void *load_bitmap(const char *name, size_t *size);

/*
 * draw a box filled with a color on screen
 *
 * box: .offset points the coordinate of the top left corner and .size specifies
 * width and height of the box. Both are relative to the canvas size thus scale
 * from 0 to CANVAS_SCALE (0 to 100%).
 * rgb: RGB color of the box.
 *
 * return: CBGFX_* error codes
 */
int draw_box(const struct rect *box, const struct rgb_color *rgb);

/*
 * Clear the canvas
 */
int clear_canvas(struct rgb_color *rgb);

/*
 * Clear the screen
 */
int clear_screen(struct rgb_color *rgb);

/*
 * Draw a bitmap image on screen.
 *
 * top_left_rel: coordinate of the top left corner of the image relative to the
 * canvas (0 - CANVAS_SCALE). If scale_rel is zero, this is treated as absolute
 * coordinate.
 * scale_rel: scale factor relative to the canvas width (0 - CANVAS_SCALE). If
 * this is zero, scaling is turned off and the image is rendered with the
 * original size.
 * bitmap: pointer to the bitmap data, starting from the file header.
 * size: size of the bitmap data
 *
 * return: CBGFX_* error codes
 */
int draw_bitmap(const struct vector *top_left_rel,
		size_t scale_rel, const void *bitmap, size_t size);