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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:	2024-12-05 08:52:37	Branches:	22	22	100.0 %


/***************************************************************************
 * Copyright (c) 2024 Microsoft Corporation
 *
 * 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                                                  */
/*                                                                        */
/*  RELEASE HISTORY                                                       */
/*                                                                        */
/*    DATE              NAME                      DESCRIPTION             */
/*                                                                        */
/*  05-19-2020     Kenneth Maxwell          Initial Version 6.0           */
/*  09-30-2020     Kenneth Maxwell          Modified comment(s),          */
/*                                            resulting in version 6.1    */
/*                                                                        */
/**************************************************************************/
#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			*
4			* This program and the accompanying materials are made available under the
5			* terms of the MIT License which is available at
6			* https://opensource.org/licenses/MIT.
7			*
8			* SPDX-License-Identifier: MIT
9			**************************************************************************/
10
11
12			/**************************************************************************/
13			/**************************************************************************/
14			/** */
15			/** GUIX Component */
16			/** */
17			/** Display Management (Display) */
18			/** */
19			/**************************************************************************/
20
21			#define GX_SOURCE_CODE
22
23
24			/* Include necessary system files. */
25
26			#include "gx_api.h"
27			#include "gx_system.h"
28			#include "gx_utility.h"
29			#include "gx_display.h"
30
31			/**************************************************************************/
32			/* */
33			/* FUNCTION RELEASE */
34			/* */
35			/* _gx_display_driver_generic_aliased_circle_draw PORTABLE C */
36			/* 6.1 */
37			/* AUTHOR */
38			/* */
39			/* Kenneth Maxwell, Microsoft Corporation */
40			/* */
41			/* DESCRIPTION */
42			/* */
43			/* Display driver to draw anti-aliased circle. */
44			/* */
45			/* INPUT */
46			/* */
47			/* context Drawing context */
48			/* xcenter x-coord of center of circle */
49			/* ycenter y-coord of center of circle */
50			/* r Radius of circle */
51			/* */
52			/* OUTPUT */
53			/* */
54			/* None */
55			/* */
56			/* CALLS */
57			/* */
58			/* _gx_utility_rectangle_overlap_detect Detect two rectangles being */
59			/* overlap to each other */
60			/* [gx_display_driver_pixel_blend] Basic display driver pixel */
61			/* blend function */
62			/* */
63			/* CALLED BY */
64			/* */
65			/* GUIX Internal Code */
66			/* */
67			/* RELEASE HISTORY */
68			/* */
69			/* DATE NAME DESCRIPTION */
70			/* */
71			/* 05-19-2020 Kenneth Maxwell Initial Version 6.0 */
72			/* 09-30-2020 Kenneth Maxwell Modified comment(s), */
73			/* resulting in version 6.1 */
74			/* */
75			/**************************************************************************/
76			#if defined(GX_ARC_DRAWING_SUPPORT)
77
78		306	VOID _gx_display_driver_generic_aliased_circle_draw(GX_DRAW_CONTEXT *context, INT xcenter, INT ycenter, UINT r)
79			{
80			/* The circle draw function is implemented from midpoint circle algorithm. */
81
82			GX_DISPLAY *display;
83			GX_RECTANGLE *clip;
84			GX_BRUSH *brush;
85			INT x;
86			INT y;
87			GX_POINT point;
88		306	INT sign[4][2] = {{1, 1}, {-1, 1}, {1, -1}, {-1, -1}};
89			INT index;
90			INT error;
91			INT yi;
92			GX_UBYTE alpha1;
93			GX_UBYTE alpha2;
94			VOID (blend_func)(GX_DRAW_CONTEXT context,
95			INT x, INT y, GX_COLOR color, GX_UBYTE alpha);
96
97			#if defined(GX_BRUSH_ALPHA_SUPPORT)
98			GX_UBYTE brush_alpha;
99
100		306	brush_alpha = context -> gx_draw_context_brush.gx_brush_alpha;
101
102	✓✓	306	if (brush_alpha == 0)
103			{
104			/* Nothing to draw here. */
105		85	return;
106			}
107			#endif
108
109		222	display = context -> gx_draw_context_display;
110		222	clip = context -> gx_draw_context_clip;
111		222	brush = &context -> gx_draw_context_brush;
112
113		222	blend_func = display -> gx_display_driver_pixel_blend;
114
115	✓✓	222	if (blend_func == GX_NULL)
116			{
117		1	return;
118			}
119
120		221	x = 0;
121		221	y = (INT)r;
122		221	error = 0;
123
124	✓✓	21140	while (x < y)
125			{
126		20919	alpha1 = (GX_UBYTE)(255 - error);
127		20919	alpha2 = (GX_UBYTE)error;
128			#if defined(GX_BRUSH_ALPHA_SUPPORT)
129		20919	alpha1 = (GX_UBYTE)(alpha1 * brush_alpha / 255);
130		20919	alpha2 = (GX_UBYTE)(alpha2 * brush_alpha / 255);
131			#endif
132
133	✓✓	104595	for (index = 0; index < 4; index++)
134			{
135		83676	point.gx_point_x = (GX_VALUE)(x * sign[index][0] + xcenter);
136		83676	point.gx_point_y = (GX_VALUE)(y * sign[index][1] + ycenter);
137
138	✓✓	83676	if (_gx_utility_rectangle_point_detect(clip, point))
139			{
140		61872	blend_func(context, point.gx_point_x, point.gx_point_y, brush -> gx_brush_line_color, alpha1);
141			}
142
143		83676	point.gx_point_y = (GX_VALUE)((y - 1) * sign[index][1] + ycenter);
144
145	✓✓	83676	if (_gx_utility_rectangle_point_detect(clip, point))
146			{
147		62946	blend_func(context, point.gx_point_x, point.gx_point_y, brush -> gx_brush_line_color, alpha2);
148			}
149
150		83676	point.gx_point_x = (GX_VALUE)(y * sign[index][0] + xcenter);
151		83676	point.gx_point_y = (GX_VALUE)(x * sign[index][1] + ycenter);
152
153	✓✓	83676	if (_gx_utility_rectangle_point_detect(clip, point))
154			{
155		45058	blend_func(context, point.gx_point_x, point.gx_point_y, brush -> gx_brush_line_color, alpha1);
156			}
157
158		83676	point.gx_point_x = (GX_VALUE)((y - 1) * sign[index][0] + xcenter);
159
160	✓✓	83676	if (_gx_utility_rectangle_point_detect(clip, point))
161			{
162		45908	blend_func(context, point.gx_point_x, point.gx_point_y, brush -> gx_brush_line_color, alpha2);
163			}
164			}
165
166		20919	x++;
167
168		20919	yi = (INT)(r * r) - x * x;
169		20919	error = (y << 8) - (INT)(_gx_utility_math_sqrt((UINT)(yi << 10)) << 3);
170
171	✓✓	29591	while (error >= 255)
172			{
173		8672	error -= 255;
174		8672	y--;
175			}
176			}
177
178		221	alpha1 = (GX_UBYTE)(255 - error);
179			#if defined(GX_BRUSH_ALPHA_SUPPORT)
180		221	alpha1 = (GX_UBYTE)(alpha1 * brush_alpha / 255);
181			#endif
182
183	✓✓	1105	for (index = 0; index < 4; index++)
184			{
185		884	point.gx_point_x = (GX_VALUE)(x * sign[index][0] + xcenter);
186		884	point.gx_point_y = (GX_VALUE)(y * sign[index][1] + ycenter);
187
188	✓✓	884	if (_gx_utility_rectangle_point_detect(clip, point))
189			{
190		870	blend_func(context, point.gx_point_x, point.gx_point_y, brush -> gx_brush_line_color, alpha1);
191			}
192			}
193			}
194
195			#endif
196