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/* ========================================================================= */
/**
* @file segment_display.h
*
* @copyright
* Copyright 2023 Google LLC
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* https://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#ifndef __WLM_SEGMENT_DISPLAY_H__
#define __WLM_SEGMENT_DISPLAY_H__
#include <libbase/libbase.h>
#include <cairo.h>
#include <inttypes.h>
#ifdef __cplusplus
extern "C" {
#endif // __cplusplus
/** Parameters to describe segment properties. */
typedef struct {
/** Offset distance, from origin to start of segment. */
double offset;
/** Full width of the segment, along the lateral direction. */
double width;
/** Length of a horizontal segment, along longitudinal direction. */
double hlength;
/** Length of a vertical segment, along longitudinal direction. */
double vlength;
} wlm_cairo_7segment_param_t;
/** Parameters for a 6x8-pixel-sized 7-segment digit display. */
extern const wlm_cairo_7segment_param_t wlm_cairo_7segment_param_6x8;
/** Parameters for a 7x10-pixel-sized 7-segment digit display. */
extern const wlm_cairo_7segment_param_t wlm_cairo_7segment_param_7x10;
/** Parameters for a 8x12-pixel-sized 7-segment digit display. */
extern const wlm_cairo_7segment_param_t wlm_cairo_7segment_param_8x12;
/** Parameters for a 16x24-pixel-sized 7-segment digit display. */
extern const wlm_cairo_7segment_param_t wlm_cairo_7segment_param_16x24;
/**
* Draws a digit using 7-segment visualization.
*
* @param cairo_ptr The `cairo_t` target to draw the digits to.
* @param param_ptr Visualization parameters for the segments.
* @param x X coordinate of lower left corner.
* @param y Y coordinate of lower left corner.
* @param color_on An ARGB32 value for an illuminated segment.
* @param color_off An ARGB32 value for a non-illuminated segment.
* @param digit Digit to draw. Must be 0 <= digit < 10.
*/
void wlm_cairo_7segment_display_digit(
cairo_t *cairo_ptr,
const wlm_cairo_7segment_param_t *param_ptr,
uint32_t x,
uint32_t y,
uint32_t color_on,
uint32_t color_off,
uint8_t digit);
/** Unit test cases. */
extern const bs_test_case_t wlm_cairo_segment_display_test_cases[];
#ifdef __cplusplus
} // extern "C"
#endif // __cplusplus
#endif /* __WLM_SEGMENT_DISPLAY_H__ */
/* == End of segment_display.h ============================================= */
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