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GCC Code Coverage Report

Directory:	./		Exec	Total	Coverage
File:	gx_display_driver_generic_aliased_circle_draw.c	Lines:	47	47	100.0 %
Date:	2026-03-06 19:21:09	Branches:	22	22	100.0 %


/***************************************************************************
 * Copyright (c) 2024 Microsoft Corporation
 * Copyright (c) 2026-present Eclipse ThreadX contributors
 *
 * This program and the accompanying materials are made available under the
 * terms of the MIT License which is available at
 * https://opensource.org/licenses/MIT.
 *
 * SPDX-License-Identifier: MIT
 **************************************************************************/


/**************************************************************************/
/**************************************************************************/
/**                                                                       */
/** GUIX Component                                                        */
/**                                                                       */
/**   Display Management (Display)                                        */
/**                                                                       */
/**************************************************************************/

#define GX_SOURCE_CODE


/* Include necessary system files.  */

#include "gx_api.h"
#include "gx_system.h"
#include "gx_utility.h"
#include "gx_display.h"

/**************************************************************************/
/*                                                                        */
/*  FUNCTION                                               RELEASE        */
/*                                                                        */
/*    _gx_display_driver_generic_aliased_circle_draw      PORTABLE C      */
/*                                                           6.1          */
/*  AUTHOR                                                                */
/*                                                                        */
/*    Kenneth Maxwell, Microsoft Corporation                              */
/*                                                                        */
/*  DESCRIPTION                                                           */
/*                                                                        */
/*    Display driver to draw anti-aliased circle.                         */
/*                                                                        */
/*  INPUT                                                                 */
/*                                                                        */
/*    context                               Drawing context               */
/*    xcenter                               x-coord of center of circle   */
/*    ycenter                               y-coord of center of circle   */
/*    r                                     Radius of circle              */
/*                                                                        */
/*  OUTPUT                                                                */
/*                                                                        */
/*    None                                                                */
/*                                                                        */
/*  CALLS                                                                 */
/*                                                                        */
/*    _gx_utility_rectangle_overlap_detect  Detect two rectangles being   */
/*                                            overlap to each other       */
/*    [gx_display_driver_pixel_blend]       Basic display driver pixel    */
/*                                            blend function              */
/*                                                                        */
/*  CALLED BY                                                             */
/*                                                                        */
/*    GUIX Internal Code                                                  */
/*                                                                        */
/**************************************************************************/
#if defined(GX_ARC_DRAWING_SUPPORT)

VOID _gx_display_driver_generic_aliased_circle_draw(GX_DRAW_CONTEXT *context, INT xcenter, INT ycenter, UINT r)
{
/* The circle draw function is implemented from midpoint circle algorithm. */

GX_DISPLAY   *display;
GX_RECTANGLE *clip;
GX_BRUSH     *brush;
INT           x;
INT           y;
GX_POINT      point;
INT           sign[4][2] = {{1, 1}, {-1, 1}, {1, -1}, {-1, -1}};
INT           index;
INT           error;
INT           yi;
GX_UBYTE      alpha1;
GX_UBYTE      alpha2;
VOID          (*blend_func)(GX_DRAW_CONTEXT *context,
                            INT x, INT y, GX_COLOR color, GX_UBYTE alpha);

#if defined(GX_BRUSH_ALPHA_SUPPORT)
GX_UBYTE brush_alpha;

    brush_alpha = context -> gx_draw_context_brush.gx_brush_alpha;

    if (brush_alpha == 0)
    {
        /* Nothing to draw here. */
        return;
    }
#endif

    display = context -> gx_draw_context_display;
    clip = context -> gx_draw_context_clip;
    brush = &context -> gx_draw_context_brush;

    blend_func = display -> gx_display_driver_pixel_blend;

    if (blend_func == GX_NULL)
    {
        return;
    }

    x = 0;
    y = (INT)r;
    error = 0;

    while (x < y)
    {
        alpha1 = (GX_UBYTE)(255 - error);
        alpha2 = (GX_UBYTE)error;
#if defined(GX_BRUSH_ALPHA_SUPPORT)
        alpha1 = (GX_UBYTE)(alpha1 * brush_alpha / 255);
        alpha2 = (GX_UBYTE)(alpha2 * brush_alpha / 255);
#endif

        for (index = 0; index < 4; index++)
        {
            point.gx_point_x = (GX_VALUE)(x * sign[index][0] + xcenter);
            point.gx_point_y = (GX_VALUE)(y * sign[index][1] + ycenter);

            if (_gx_utility_rectangle_point_detect(clip, point))
            {
                blend_func(context, point.gx_point_x, point.gx_point_y, brush -> gx_brush_line_color, alpha1);
            }

            point.gx_point_y = (GX_VALUE)((y - 1) * sign[index][1] + ycenter);

            if (_gx_utility_rectangle_point_detect(clip, point))
            {
                blend_func(context, point.gx_point_x, point.gx_point_y, brush -> gx_brush_line_color, alpha2);
            }

            point.gx_point_x = (GX_VALUE)(y * sign[index][0] + xcenter);
            point.gx_point_y = (GX_VALUE)(x * sign[index][1] + ycenter);

            if (_gx_utility_rectangle_point_detect(clip, point))
            {
                blend_func(context, point.gx_point_x, point.gx_point_y, brush -> gx_brush_line_color, alpha1);
            }

            point.gx_point_x = (GX_VALUE)((y - 1) * sign[index][0] + xcenter);

            if (_gx_utility_rectangle_point_detect(clip, point))
            {
                blend_func(context, point.gx_point_x, point.gx_point_y, brush -> gx_brush_line_color, alpha2);
            }
        }

        x++;

        yi = (INT)(r * r) - x * x;
        error = (y << 8) - (INT)(_gx_utility_math_sqrt((UINT)(yi << 10)) << 3);

        while (error >= 255)
        {
            error -= 255;
            y--;
        }
    }

    alpha1 = (GX_UBYTE)(255 - error);
#if defined(GX_BRUSH_ALPHA_SUPPORT)
    alpha1 = (GX_UBYTE)(alpha1 * brush_alpha / 255);
#endif

    for (index = 0; index < 4; index++)
    {
        point.gx_point_x = (GX_VALUE)(x * sign[index][0] + xcenter);
        point.gx_point_y = (GX_VALUE)(y * sign[index][1] + ycenter);

        if (_gx_utility_rectangle_point_detect(clip, point))
        {
            blend_func(context, point.gx_point_x, point.gx_point_y, brush -> gx_brush_line_color, alpha1);
        }
    }
}

#endif



Generated by: GCOVR (Version 4.1)

Line	Branch	Exec	Source
1			/***************************************************************************
2			* Copyright (c) 2024 Microsoft Corporation
3			* Copyright (c) 2026-present Eclipse ThreadX contributors
4			*
5			* This program and the accompanying materials are made available under the
6			* terms of the MIT License which is available at
7			* https://opensource.org/licenses/MIT.
8			*
9			* SPDX-License-Identifier: MIT
10			**************************************************************************/
11
12
13			/**************************************************************************/
14			/**************************************************************************/
15			/** */
16			/** GUIX Component */
17			/** */
18			/** Display Management (Display) */
19			/** */
20			/**************************************************************************/
21
22			#define GX_SOURCE_CODE
23
24
25			/* Include necessary system files. */
26
27			#include "gx_api.h"
28			#include "gx_system.h"
29			#include "gx_utility.h"
30			#include "gx_display.h"
31
32			/**************************************************************************/
33			/* */
34			/* FUNCTION RELEASE */
35			/* */
36			/* _gx_display_driver_generic_aliased_circle_draw PORTABLE C */
37			/* 6.1 */
38			/* AUTHOR */
39			/* */
40			/* Kenneth Maxwell, Microsoft Corporation */
41			/* */
42			/* DESCRIPTION */
43			/* */
44			/* Display driver to draw anti-aliased circle. */
45			/* */
46			/* INPUT */
47			/* */
48			/* context Drawing context */
49			/* xcenter x-coord of center of circle */
50			/* ycenter y-coord of center of circle */
51			/* r Radius of circle */
52			/* */
53			/* OUTPUT */
54			/* */
55			/* None */
56			/* */
57			/* CALLS */
58			/* */
59			/* _gx_utility_rectangle_overlap_detect Detect two rectangles being */
60			/* overlap to each other */
61			/* [gx_display_driver_pixel_blend] Basic display driver pixel */
62			/* blend function */
63			/* */
64			/* CALLED BY */
65			/* */
66			/* GUIX Internal Code */
67			/* */
68			/**************************************************************************/
69			#if defined(GX_ARC_DRAWING_SUPPORT)
70
71		306	VOID _gx_display_driver_generic_aliased_circle_draw(GX_DRAW_CONTEXT *context, INT xcenter, INT ycenter, UINT r)
72			{
73			/* The circle draw function is implemented from midpoint circle algorithm. */
74
75			GX_DISPLAY *display;
76			GX_RECTANGLE *clip;
77			GX_BRUSH *brush;
78			INT x;
79			INT y;
80			GX_POINT point;
81		306	INT sign[4][2] = {{1, 1}, {-1, 1}, {1, -1}, {-1, -1}};
82			INT index;
83			INT error;
84			INT yi;
85			GX_UBYTE alpha1;
86			GX_UBYTE alpha2;
87			VOID (blend_func)(GX_DRAW_CONTEXT context,
88			INT x, INT y, GX_COLOR color, GX_UBYTE alpha);
89
90			#if defined(GX_BRUSH_ALPHA_SUPPORT)
91			GX_UBYTE brush_alpha;
92
93		306	brush_alpha = context -> gx_draw_context_brush.gx_brush_alpha;
94
95	✓✓	306	if (brush_alpha == 0)
96			{
97			/* Nothing to draw here. */
98		85	return;
99			}
100			#endif
101
102		222	display = context -> gx_draw_context_display;
103		222	clip = context -> gx_draw_context_clip;
104		222	brush = &context -> gx_draw_context_brush;
105
106		222	blend_func = display -> gx_display_driver_pixel_blend;
107
108	✓✓	222	if (blend_func == GX_NULL)
109			{
110		1	return;
111			}
112
113		221	x = 0;
114		221	y = (INT)r;
115		221	error = 0;
116
117	✓✓	21140	while (x < y)
118			{
119		20919	alpha1 = (GX_UBYTE)(255 - error);
120		20919	alpha2 = (GX_UBYTE)error;
121			#if defined(GX_BRUSH_ALPHA_SUPPORT)
122		20919	alpha1 = (GX_UBYTE)(alpha1 * brush_alpha / 255);
123		20919	alpha2 = (GX_UBYTE)(alpha2 * brush_alpha / 255);
124			#endif
125
126	✓✓	104595	for (index = 0; index < 4; index++)
127			{
128		83676	point.gx_point_x = (GX_VALUE)(x * sign[index][0] + xcenter);
129		83676	point.gx_point_y = (GX_VALUE)(y * sign[index][1] + ycenter);
130
131	✓✓	83676	if (_gx_utility_rectangle_point_detect(clip, point))
132			{
133		61872	blend_func(context, point.gx_point_x, point.gx_point_y, brush -> gx_brush_line_color, alpha1);
134			}
135
136		83676	point.gx_point_y = (GX_VALUE)((y - 1) * sign[index][1] + ycenter);
137
138	✓✓	83676	if (_gx_utility_rectangle_point_detect(clip, point))
139			{
140		62946	blend_func(context, point.gx_point_x, point.gx_point_y, brush -> gx_brush_line_color, alpha2);
141			}
142
143		83676	point.gx_point_x = (GX_VALUE)(y * sign[index][0] + xcenter);
144		83676	point.gx_point_y = (GX_VALUE)(x * sign[index][1] + ycenter);
145
146	✓✓	83676	if (_gx_utility_rectangle_point_detect(clip, point))
147			{
148		45058	blend_func(context, point.gx_point_x, point.gx_point_y, brush -> gx_brush_line_color, alpha1);
149			}
150
151		83676	point.gx_point_x = (GX_VALUE)((y - 1) * sign[index][0] + xcenter);
152
153	✓✓	83676	if (_gx_utility_rectangle_point_detect(clip, point))
154			{
155		45908	blend_func(context, point.gx_point_x, point.gx_point_y, brush -> gx_brush_line_color, alpha2);
156			}
157			}
158
159		20919	x++;
160
161		20919	yi = (INT)(r * r) - x * x;
162		20919	error = (y << 8) - (INT)(_gx_utility_math_sqrt((UINT)(yi << 10)) << 3);
163
164	✓✓	29591	while (error >= 255)
165			{
166		8672	error -= 255;
167		8672	y--;
168			}
169			}
170
171		221	alpha1 = (GX_UBYTE)(255 - error);
172			#if defined(GX_BRUSH_ALPHA_SUPPORT)
173		221	alpha1 = (GX_UBYTE)(alpha1 * brush_alpha / 255);
174			#endif
175
176	✓✓	1105	for (index = 0; index < 4; index++)
177			{
178		884	point.gx_point_x = (GX_VALUE)(x * sign[index][0] + xcenter);
179		884	point.gx_point_y = (GX_VALUE)(y * sign[index][1] + ycenter);
180
181	✓✓	884	if (_gx_utility_rectangle_point_detect(clip, point))
182			{
183		870	blend_func(context, point.gx_point_x, point.gx_point_y, brush -> gx_brush_line_color, alpha1);
184			}
185			}
186			}
187
188			#endif
189