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GCC Code Coverage Report

Directory:	./		Exec	Total	Coverage
File:	gx_display_driver_32bpp_simple_line_draw.c	Lines:	201	201	100.0 %
Date:	2026-03-06 19:21:09	Branches:	124	124	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 PIXEL_WRITE(loc, val) (*(loc) = (val))

#define GX_SOURCE_CODE

/* Include necessary system files.  */

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

/**************************************************************************/
/*                                                                        */
/*  FUNCTION                                               RELEASE        */
/*                                                                        */
/*    _gx_display_driver_32bpp_simple_line_draw           PORTABLE C      */
/*                                                           6.1          */
/*  AUTHOR                                                                */
/*                                                                        */
/*    Kenneth Maxwell, Microsoft Corporation                              */
/*                                                                        */
/*  DESCRIPTION                                                           */
/*                                                                        */
/*    Generic 32bpp color format line draw function.                      */
/*                                                                        */
/*  INPUT                                                                 */
/*                                                                        */
/*    context                               Drawing context               */
/*    xstart                                x-coord of endpoint           */
/*    ystart                                y-coord of endpoint           */
/*    xend                                  x-coord of endpoint           */
/*    yend                                  y-coord of endpoint           */
/*                                                                        */
/*  OUTPUT                                                                */
/*                                                                        */
/*    None                                                                */
/*                                                                        */
/*  CALLS                                                                 */
/*                                                                        */
/*    _gx_display_driver_simple_line_alpha_draw                           */
/*                                          Basic display driver line     */
/*                                            alpha draw function         */
/*                                                                        */
/*  CALLED BY                                                             */
/*                                                                        */
/*    GUIX Internal Code                                                  */
/*                                                                        */
/**************************************************************************/
VOID _gx_display_driver_32bpp_simple_line_draw(GX_DRAW_CONTEXT *context, INT xstart, INT ystart, INT xend, INT yend)
{
INT           curx;
INT           cury;
INT           x_sign;
INT           y_sign;
INT           decision;
INT           nextx;
INT           nexty;
INT           y_increment;
GX_POINT      end_point;
GX_POINT      mid_point;
GX_RECTANGLE  half_rectangle;
GX_RECTANGLE  half_over;
INT           sign;
INT           steps;

ULONG        *put;
ULONG        *next_put;

GX_BOOL       clipped = GX_TRUE;
INT           dx = GX_ABS(xend - xstart);
INT           dy = GX_ABS(yend - ystart);

GX_RECTANGLE *clip = context -> gx_draw_context_clip;
GX_COLOR      linecolor = context -> gx_draw_context_brush.gx_brush_line_color;
#if defined GX_BRUSH_ALPHA_SUPPORT
GX_UBYTE      alpha;

    alpha = context -> gx_draw_context_brush.gx_brush_alpha;
    if (alpha == 0)
    {
        /* Nothing to drawn. Just return. */
        return;
    }
    if (alpha != 0xff)
    {
        _gx_display_driver_simple_line_alpha_draw(context, xstart, ystart, xend, yend, alpha);
        return;
    }
#endif

    if (((dx >= dy && (xstart > xend)) || ((dy > dx) && ystart > yend)))
    {
        GX_SWAP_VALS(xend, xstart);
        GX_SWAP_VALS(yend, ystart);
    }
    x_sign = (xend - xstart) / dx;
    y_sign = (yend - ystart) / dy;

    if (y_sign > 0)
    {
        y_increment = context -> gx_draw_context_pitch;
    }
    else
    {
        y_increment = 0 - context -> gx_draw_context_pitch;
    }

    put = (ULONG *)(context -> gx_draw_context_memory) + ystart * context -> gx_draw_context_pitch + xstart;
    next_put = (ULONG *)(context -> gx_draw_context_memory) + yend * context -> gx_draw_context_pitch + xend;


    end_point.gx_point_x = (GX_VALUE)xstart;
    end_point.gx_point_y = (GX_VALUE)ystart;

    if (_gx_utility_rectangle_point_detect(clip, end_point))
    {
        end_point.gx_point_x = (GX_VALUE)xend;
        end_point.gx_point_y = (GX_VALUE)yend;

        if (_gx_utility_rectangle_point_detect(clip, end_point))
        {
            clipped = GX_FALSE;
        }
    }

    if (clipped)
    {
        /* here if we must do clipping in the inner loop, because one
        or both of the end points are outside clipping rectangle */

        /* Calculate the middle point of the line.  */
        mid_point.gx_point_x = (GX_VALUE)(xend + xstart) >> 1;
        mid_point.gx_point_y = (GX_VALUE)(yend + ystart) >> 1;

        /* Judge the clip in which side.  */
        if (_gx_utility_rectangle_point_detect(clip, mid_point))
        {

            /* the clip in two sides.  */
            if (dx >= dy)
            {
                /* walk out the clipping point.  */
                for (curx = xstart, cury = ystart, decision = (dx >> 1); curx < mid_point.gx_point_x;
                    curx++, decision += dy)
                {
                    if (decision >= dx)
                    {
                        decision -= dx;
                        cury += y_sign;
                        put += y_increment;
                    }

                    if (curx >= clip -> gx_rectangle_left &&
                        cury >= clip -> gx_rectangle_top &&
                        cury <= clip -> gx_rectangle_bottom)
                    {
                        break;
                    }
                    put++;
                }
                for (; curx <= mid_point.gx_point_x;
                    curx++, decision += dy)
                {
                    if (decision >= dx)
                    {
                        decision -= dx;
                        cury += y_sign;
                        put += y_increment;
                    }
                    PIXEL_WRITE(put, linecolor);
                    put++;
                }
                for (nextx = xend, nexty = yend, decision = (dx >> 1); nextx > mid_point.gx_point_x;
                    nextx--, decision += dy)
                {
                    if (decision >= dx)
                    {
                        decision -= dx;
                        nexty -= y_sign;
                        next_put -= y_increment;
                    }
                    if (nextx <= clip -> gx_rectangle_right &&
                        nexty >= clip -> gx_rectangle_top &&
                        nexty <= clip -> gx_rectangle_bottom)
                    {
                        break;
                    }
                    next_put--;
                }

                for (; nextx > mid_point.gx_point_x;
                    nextx--, decision += dy)
                {
                    if (decision >= dx)
                    {
                        decision -= dx;
                        nexty -= y_sign;
                        next_put -= y_increment;
                    }
                    PIXEL_WRITE(next_put, linecolor);
                    next_put--;
                }
            }
            else
            {
                for (nextx = xend, nexty = yend, decision = (dy >> 1); nexty > mid_point.gx_point_y;
                    nexty--, decision += dx)
                {
                    if (decision >= dy)
                    {
                        decision -= dy;
                        nextx -= x_sign;
                        next_put -= x_sign;
                    }
                    if (nextx >= clip -> gx_rectangle_left &&
                        nextx <= clip -> gx_rectangle_right &&
                        nexty <= clip -> gx_rectangle_bottom)
                    {
                        break;
                    }
                    next_put -= context -> gx_draw_context_pitch;
                }

                for (; nexty > mid_point.gx_point_y;
                    nexty--, decision += dx)
                {
                    if (decision >= dy)
                    {
                        decision -= dy;
                        nextx -= x_sign;
                        next_put -= x_sign;
                    }
                    PIXEL_WRITE(next_put, linecolor);
                    next_put -= context -> gx_draw_context_pitch;
                }

                /* walk out the clipping point.  */
                for (curx = xstart, cury = ystart, decision = (dy >> 1); cury < mid_point.gx_point_y;
                    cury++, decision += dx)
                {
                    if (decision >= dy)
                    {
                        decision -= dy;
                        curx += x_sign;
                        put += x_sign;
                    }

                    if (curx >= clip -> gx_rectangle_left &&
                        curx <= clip -> gx_rectangle_right &&
                        cury >= clip -> gx_rectangle_top)
                    {
                        break;
                    }
                    put += context -> gx_draw_context_pitch;
                }
                for (; cury <= mid_point.gx_point_y;
                    cury++, decision += dx)
                {
                    if (decision >= dy)
                    {
                        decision -= dy;
                        curx += x_sign;
                        put += x_sign;
                    }
                    PIXEL_WRITE(put, linecolor);
                    put += context -> gx_draw_context_pitch;
                }
            }   /**/
                /*context   ->  gx_draw_context_display  ->  gx_display_driver_pixel_write(context, mid_point.gx_point_x,mid_point.gx_point_y, GX_COLOR_RED);*/
        }
        else
        {
            /* The clip stay at one side.  */
            if (dx >= dy)
            {
                half_rectangle.gx_rectangle_left = (GX_VALUE)xstart;
                half_rectangle.gx_rectangle_right = mid_point.gx_point_x;
                if (y_sign == 1)
                {
                    half_rectangle.gx_rectangle_top = (GX_VALUE)ystart;
                    half_rectangle.gx_rectangle_bottom = mid_point.gx_point_y;
                }
                else
                {
                    half_rectangle.gx_rectangle_top = mid_point.gx_point_y;
                    half_rectangle.gx_rectangle_bottom = (GX_VALUE)ystart;
                }

                if (_gx_utility_rectangle_overlap_detect(clip, &half_rectangle, &half_over))
                {
                    curx = xstart;
                    cury = ystart;
                    steps = mid_point.gx_point_x - curx + 1;
                    sign = 1;
                }
                else
                {
                    curx = xend;
                    cury = yend;
                    steps = xend - mid_point.gx_point_x;
                    sign = -1;
                    y_increment = 0 - y_increment;
                    y_sign = 0 - y_sign;
                    put = next_put;
                }
                for (decision = (dx >> 1); steps > 0; curx += sign, decision += dy, steps--)
                {
                    if (decision >= dx)
                    {
                        decision -= dx;
                        cury += y_sign;
                        put += y_increment;
                    }

                    if (curx >= clip -> gx_rectangle_left &&
                        curx <= clip -> gx_rectangle_right &&
                        cury >= clip -> gx_rectangle_top &&
                        cury <= clip -> gx_rectangle_bottom)
                    {
                        PIXEL_WRITE(put, linecolor);
                    }
                    put += sign;
                }
            }
            else
            {
                half_rectangle.gx_rectangle_top = (GX_VALUE)ystart;
                half_rectangle.gx_rectangle_bottom = mid_point.gx_point_y;
                if (x_sign == 1)
                {
                    half_rectangle.gx_rectangle_right = mid_point.gx_point_x;
                    half_rectangle.gx_rectangle_left = (GX_VALUE)xstart;
                }
                else
                {
                    half_rectangle.gx_rectangle_right = (GX_VALUE)xstart;
                    half_rectangle.gx_rectangle_left = mid_point.gx_point_x;
                }

                if (_gx_utility_rectangle_overlap_detect(clip, &half_rectangle, &half_over))
                {
                    curx = xstart;
                    cury = ystart;
                    steps = mid_point.gx_point_y - cury + 1;
                    y_increment = context -> gx_draw_context_pitch;
                    sign = 1;
                }
                else
                {
                    curx = xend;
                    cury = yend;
                    steps = yend - mid_point.gx_point_y;
                    sign = -1;
                    y_increment = 0 - context -> gx_draw_context_pitch;
                    x_sign = 0 - x_sign;
                    put = next_put;
                }

                for (decision = (dy >> 1); steps > 0; cury += sign, decision += dx, steps--)
                {
                    if (decision >= dy)
                    {
                        decision -= dy;
                        curx += x_sign;
                        put += x_sign;
                    }
                    if (curx >= clip -> gx_rectangle_left &&
                        curx <= clip -> gx_rectangle_right &&
                        cury >= clip -> gx_rectangle_top &&
                        cury <= clip -> gx_rectangle_bottom)
                    {
                        PIXEL_WRITE(put, linecolor);
                    }
                    put += y_increment;
                }
            }
        }
    }
    else
    {
        /* here if both line ends lie within clipping rectangle, we can
        run a faster inner loop */
        if (dx >= dy)
        {
            put = (ULONG *)(context -> gx_draw_context_memory) + ystart * context -> gx_draw_context_pitch + xstart;
            next_put = (ULONG *)(context -> gx_draw_context_memory) + yend * context -> gx_draw_context_pitch + xend;

            for (curx = xstart, cury = ystart, nextx = xend, nexty = yend,
                decision = (dx >> 1); curx <= nextx; curx++, nextx--,
                decision += dy)
            {

                if (decision >= dx)
                {
                    decision -= dx;
                    cury += y_sign;
                    nexty -= y_sign;

                    put += y_increment;
                    next_put -= y_increment;
                }
                PIXEL_WRITE(put, linecolor);
                PIXEL_WRITE(next_put, linecolor);

                put++;
                next_put--;
            }
        }
        else
        {

            for (curx = xstart, cury = ystart, nextx = xend, nexty = yend,
                decision = (dy >> 1); cury <= nexty; cury++, nexty--,
                decision += dx)
            {
                if (decision >= dy)
                {
                    decision -= dy;
                    curx += x_sign;
                    nextx -= x_sign;

                    put += x_sign;
                    next_put -= x_sign;
                }
                PIXEL_WRITE(put, linecolor);
                PIXEL_WRITE(next_put, linecolor);

                put += context -> gx_draw_context_pitch;
                next_put -= context -> gx_draw_context_pitch;
            }
        }
    }
}


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			#define PIXEL_WRITE(loc, val) (*(loc) = (val))
22
23			#define GX_SOURCE_CODE
24
25			/* Include necessary system files. */
26
27			#include "gx_api.h"
28			#include "gx_utility.h"
29			#include "gx_display.h"
30
31			/**************************************************************************/
32			/* */
33			/* FUNCTION RELEASE */
34			/* */
35			/* _gx_display_driver_32bpp_simple_line_draw PORTABLE C */
36			/* 6.1 */
37			/* AUTHOR */
38			/* */
39			/* Kenneth Maxwell, Microsoft Corporation */
40			/* */
41			/* DESCRIPTION */
42			/* */
43			/* Generic 32bpp color format line draw function. */
44			/* */
45			/* INPUT */
46			/* */
47			/* context Drawing context */
48			/* xstart x-coord of endpoint */
49			/* ystart y-coord of endpoint */
50			/* xend x-coord of endpoint */
51			/* yend y-coord of endpoint */
52			/* */
53			/* OUTPUT */
54			/* */
55			/* None */
56			/* */
57			/* CALLS */
58			/* */
59			/* _gx_display_driver_simple_line_alpha_draw */
60			/* Basic display driver line */
61			/* alpha draw function */
62			/* */
63			/* CALLED BY */
64			/* */
65			/* GUIX Internal Code */
66			/* */
67			/**************************************************************************/
68		187	VOID _gx_display_driver_32bpp_simple_line_draw(GX_DRAW_CONTEXT *context, INT xstart, INT ystart, INT xend, INT yend)
69			{
70			INT curx;
71			INT cury;
72			INT x_sign;
73			INT y_sign;
74			INT decision;
75			INT nextx;
76			INT nexty;
77			INT y_increment;
78			GX_POINT end_point;
79			GX_POINT mid_point;
80			GX_RECTANGLE half_rectangle;
81			GX_RECTANGLE half_over;
82			INT sign;
83			INT steps;
84
85			ULONG *put;
86			ULONG *next_put;
87
88		187	GX_BOOL clipped = GX_TRUE;
89		187	INT dx = GX_ABS(xend - xstart);
90		187	INT dy = GX_ABS(yend - ystart);
91
92		187	GX_RECTANGLE *clip = context -> gx_draw_context_clip;
93		187	GX_COLOR linecolor = context -> gx_draw_context_brush.gx_brush_line_color;
94			#if defined GX_BRUSH_ALPHA_SUPPORT
95			GX_UBYTE alpha;
96
97		187	alpha = context -> gx_draw_context_brush.gx_brush_alpha;
98	✓✓	187	if (alpha == 0)
99			{
100			/* Nothing to drawn. Just return. */
101		68	return;
102			}
103	✓✓	163	if (alpha != 0xff)
104			{
105		44	_gx_display_driver_simple_line_alpha_draw(context, xstart, ystart, xend, yend, alpha);
106		44	return;
107			}
108			#endif
109
110	✓✓✓✓ ✓✓✓✓	119	if (((dx >= dy && (xstart > xend)) \|\| ((dy > dx) && ystart > yend)))
111			{
112		16	GX_SWAP_VALS(xend, xstart);
113		16	GX_SWAP_VALS(yend, ystart);
114			}
115		119	x_sign = (xend - xstart) / dx;
116		119	y_sign = (yend - ystart) / dy;
117
118	✓✓	119	if (y_sign > 0)
119			{
120		102	y_increment = context -> gx_draw_context_pitch;
121			}
122			else
123			{
124		17	y_increment = 0 - context -> gx_draw_context_pitch;
125			}
126
127		119	put = (ULONG )(context -> gx_draw_context_memory) + ystart context -> gx_draw_context_pitch + xstart;
128		119	next_put = (ULONG )(context -> gx_draw_context_memory) + yend context -> gx_draw_context_pitch + xend;
129
130
131		119	end_point.gx_point_x = (GX_VALUE)xstart;
132		119	end_point.gx_point_y = (GX_VALUE)ystart;
133
134	✓✓	119	if (_gx_utility_rectangle_point_detect(clip, end_point))
135			{
136		73	end_point.gx_point_x = (GX_VALUE)xend;
137		73	end_point.gx_point_y = (GX_VALUE)yend;
138
139	✓✓	73	if (_gx_utility_rectangle_point_detect(clip, end_point))
140			{
141		53	clipped = GX_FALSE;
142			}
143			}
144
145	✓✓	119	if (clipped)
146			{
147			/* here if we must do clipping in the inner loop, because one
148			or both of the end points are outside clipping rectangle */
149
150			/* Calculate the middle point of the line. */
151		66	mid_point.gx_point_x = (GX_VALUE)(xend + xstart) >> 1;
152		66	mid_point.gx_point_y = (GX_VALUE)(yend + ystart) >> 1;
153
154			/* Judge the clip in which side. */
155	✓✓	66	if (_gx_utility_rectangle_point_detect(clip, mid_point))
156			{
157
158			/* the clip in two sides. */
159	✓✓	52	if (dx >= dy)
160			{
161			/* walk out the clipping point. */
162	✓✓	1649	for (curx = xstart, cury = ystart, decision = (dx >> 1); curx < mid_point.gx_point_x;
163		1614	curx++, decision += dy)
164			{
165	✓✓	1648	if (decision >= dx)
166			{
167		884	decision -= dx;
168		884	cury += y_sign;
169		884	put += y_increment;
170			}
171
172	✓✓	1648	if (curx >= clip -> gx_rectangle_left &&
173	✓✓	77	cury >= clip -> gx_rectangle_top &&
174	✓✓	44	cury <= clip -> gx_rectangle_bottom)
175			{
176		34	break;
177			}
178		1614	put++;
179			}
180	✓✓	1139	for (; curx <= mid_point.gx_point_x;
181		1104	curx++, decision += dy)
182			{
183	✓✓	1104	if (decision >= dx)
184			{
185		584	decision -= dx;
186		584	cury += y_sign;
187		584	put += y_increment;
188			}
189		1104	PIXEL_WRITE(put, linecolor);
190		1104	put++;
191			}
192	✓✓	1725	for (nextx = xend, nexty = yend, decision = (dx >> 1); nextx > mid_point.gx_point_x;
193		1690	nextx--, decision += dy)
194			{
195	✓✓	1715	if (decision >= dx)
196			{
197		914	decision -= dx;
198		914	nexty -= y_sign;
199		914	next_put -= y_increment;
200			}
201	✓✓	1715	if (nextx <= clip -> gx_rectangle_right &&
202	✓✓	70	nexty >= clip -> gx_rectangle_top &&
203	✓✓	44	nexty <= clip -> gx_rectangle_bottom)
204			{
205		25	break;
206			}
207		1690	next_put--;
208			}
209
210	✓✓	1029	for (; nextx > mid_point.gx_point_x;
211		994	nextx--, decision += dy)
212			{
213	✓✓	994	if (decision >= dx)
214			{
215		533	decision -= dx;
216		533	nexty -= y_sign;
217		533	next_put -= y_increment;
218			}
219		994	PIXEL_WRITE(next_put, linecolor);
220		994	next_put--;
221			}
222			}
223			else
224			{
225	✓✓	844	for (nextx = xend, nexty = yend, decision = (dy >> 1); nexty > mid_point.gx_point_y;
226		827	nexty--, decision += dx)
227			{
228	✓✓	842	if (decision >= dy)
229			{
230		293	decision -= dy;
231		293	nextx -= x_sign;
232		293	next_put -= x_sign;
233			}
234	✓✓	842	if (nextx >= clip -> gx_rectangle_left &&
235	✓✓	791	nextx <= clip -> gx_rectangle_right &&
236	✓✓	25	nexty <= clip -> gx_rectangle_bottom)
237			{
238		15	break;
239			}
240		827	next_put -= context -> gx_draw_context_pitch;
241			}
242
243	✓✓	748	for (; nexty > mid_point.gx_point_y;
244		731	nexty--, decision += dx)
245			{
246	✓✓	731	if (decision >= dy)
247			{
248		211	decision -= dy;
249		211	nextx -= x_sign;
250		211	next_put -= x_sign;
251			}
252		731	PIXEL_WRITE(next_put, linecolor);
253		731	next_put -= context -> gx_draw_context_pitch;
254			}
255
256			/* walk out the clipping point. */
257	✓✓	694	for (curx = xstart, cury = ystart, decision = (dy >> 1); cury < mid_point.gx_point_y;
258		677	cury++, decision += dx)
259			{
260	✓✓	693	if (decision >= dy)
261			{
262		278	decision -= dy;
263		278	curx += x_sign;
264		278	put += x_sign;
265			}
266
267	✓✓	693	if (curx >= clip -> gx_rectangle_left &&
268	✓✓	117	curx <= clip -> gx_rectangle_right &&
269	✓✓	45	cury >= clip -> gx_rectangle_top)
270			{
271		16	break;
272			}
273		677	put += context -> gx_draw_context_pitch;
274			}
275	✓✓	912	for (; cury <= mid_point.gx_point_y;
276		895	cury++, decision += dx)
277			{
278	✓✓	895	if (decision >= dy)
279			{
280		232	decision -= dy;
281		232	curx += x_sign;
282		232	put += x_sign;
283			}
284		895	PIXEL_WRITE(put, linecolor);
285		895	put += context -> gx_draw_context_pitch;
286			}
287			} /**/
288			/context -> gx_draw_context_display -> gx_display_driver_pixel_write(context, mid_point.gx_point_x,mid_point.gx_point_y, GX_COLOR_RED);/
289			}
290			else
291			{
292			/* The clip stay at one side. */
293	✓✓	14	if (dx >= dy)
294			{
295		8	half_rectangle.gx_rectangle_left = (GX_VALUE)xstart;
296		8	half_rectangle.gx_rectangle_right = mid_point.gx_point_x;
297	✓✓	8	if (y_sign == 1)
298			{
299		5	half_rectangle.gx_rectangle_top = (GX_VALUE)ystart;
300		5	half_rectangle.gx_rectangle_bottom = mid_point.gx_point_y;
301			}
302			else
303			{
304		3	half_rectangle.gx_rectangle_top = mid_point.gx_point_y;
305		3	half_rectangle.gx_rectangle_bottom = (GX_VALUE)ystart;
306			}
307
308	✓✓	8	if (_gx_utility_rectangle_overlap_detect(clip, &half_rectangle, &half_over))
309			{
310		4	curx = xstart;
311		4	cury = ystart;
312		4	steps = mid_point.gx_point_x - curx + 1;
313		4	sign = 1;
314			}
315			else
316			{
317		4	curx = xend;
318		4	cury = yend;
319		4	steps = xend - mid_point.gx_point_x;
320		4	sign = -1;
321		4	y_increment = 0 - y_increment;
322		4	y_sign = 0 - y_sign;
323		4	put = next_put;
324			}
325	✓✓	765	for (decision = (dx >> 1); steps > 0; curx += sign, decision += dy, steps--)
326			{
327	✓✓	757	if (decision >= dx)
328			{
329		278	decision -= dx;
330		278	cury += y_sign;
331		278	put += y_increment;
332			}
333
334	✓✓	757	if (curx >= clip -> gx_rectangle_left &&
335	✓✓	751	curx <= clip -> gx_rectangle_right &&
336	✓✓	266	cury >= clip -> gx_rectangle_top &&
337	✓✓	235	cury <= clip -> gx_rectangle_bottom)
338			{
339		223	PIXEL_WRITE(put, linecolor);
340			}
341		757	put += sign;
342			}
343			}
344			else
345			{
346		6	half_rectangle.gx_rectangle_top = (GX_VALUE)ystart;
347		6	half_rectangle.gx_rectangle_bottom = mid_point.gx_point_y;
348	✓✓	6	if (x_sign == 1)
349			{
350		4	half_rectangle.gx_rectangle_right = mid_point.gx_point_x;
351		4	half_rectangle.gx_rectangle_left = (GX_VALUE)xstart;
352			}
353			else
354			{
355		2	half_rectangle.gx_rectangle_right = (GX_VALUE)xstart;
356		2	half_rectangle.gx_rectangle_left = mid_point.gx_point_x;
357			}
358
359	✓✓	6	if (_gx_utility_rectangle_overlap_detect(clip, &half_rectangle, &half_over))
360			{
361		4	curx = xstart;
362		4	cury = ystart;
363		4	steps = mid_point.gx_point_y - cury + 1;
364		4	y_increment = context -> gx_draw_context_pitch;
365		4	sign = 1;
366			}
367			else
368			{
369		2	curx = xend;
370		2	cury = yend;
371		2	steps = yend - mid_point.gx_point_y;
372		2	sign = -1;
373		2	y_increment = 0 - context -> gx_draw_context_pitch;
374		2	x_sign = 0 - x_sign;
375		2	put = next_put;
376			}
377
378	✓✓	658	for (decision = (dy >> 1); steps > 0; cury += sign, decision += dx, steps--)
379			{
380	✓✓	652	if (decision >= dy)
381			{
382		339	decision -= dy;
383		339	curx += x_sign;
384		339	put += x_sign;
385			}
386	✓✓	652	if (curx >= clip -> gx_rectangle_left &&
387	✓✓	646	curx <= clip -> gx_rectangle_right &&
388	✓✓	484	cury >= clip -> gx_rectangle_top &&
389	✓✓	474	cury <= clip -> gx_rectangle_bottom)
390			{
391		246	PIXEL_WRITE(put, linecolor);
392			}
393		652	put += y_increment;
394			}
395			}
396			}
397			}
398			else
399			{
400			/* here if both line ends lie within clipping rectangle, we can
401			run a faster inner loop */
402	✓✓	53	if (dx >= dy)
403			{
404		31	put = (ULONG )(context -> gx_draw_context_memory) + ystart context -> gx_draw_context_pitch + xstart;
405		31	next_put = (ULONG )(context -> gx_draw_context_memory) + yend context -> gx_draw_context_pitch + xend;
406
407		31	for (curx = xstart, cury = ystart, nextx = xend, nexty = yend,
408	✓✓	2650	decision = (dx >> 1); curx <= nextx; curx++, nextx--,
409		2619	decision += dy)
410			{
411
412	✓✓	2619	if (decision >= dx)
413			{
414		1430	decision -= dx;
415		1430	cury += y_sign;
416		1430	nexty -= y_sign;
417
418		1430	put += y_increment;
419		1430	next_put -= y_increment;
420			}
421		2619	PIXEL_WRITE(put, linecolor);
422		2619	PIXEL_WRITE(next_put, linecolor);
423
424		2619	put++;
425		2619	next_put--;
426			}
427			}
428			else
429			{
430
431		22	for (curx = xstart, cury = ystart, nextx = xend, nexty = yend,
432	✓✓	2126	decision = (dy >> 1); cury <= nexty; cury++, nexty--,
433		2104	decision += dx)
434			{
435	✓✓	2104	if (decision >= dy)
436			{
437		460	decision -= dy;
438		460	curx += x_sign;
439		460	nextx -= x_sign;
440
441		460	put += x_sign;
442		460	next_put -= x_sign;
443			}
444		2104	PIXEL_WRITE(put, linecolor);
445		2104	PIXEL_WRITE(next_put, linecolor);
446
447		2104	put += context -> gx_draw_context_pitch;
448		2104	next_put -= context -> gx_draw_context_pitch;
449			}
450			}
451			}
452			}