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GCC Code Coverage Report

Directory:	./		Exec	Total	Coverage
File:	gx_display_driver_32bpp_rotated_simple_line_draw.c	Lines:	216	216	100.0 %
Date:	2026-03-06 19:21:09	Branches:	126	126	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_rotated_simple_line_draw   PORTABLE C      */
/*                                                           6.1.4        */
/*  AUTHOR                                                                */
/*                                                                        */
/*    Kenneth Maxwell, Microsoft Corporation                              */
/*                                                                        */
/*  DESCRIPTION                                                           */
/*                                                                        */
/*    Generic rotated 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_rotated_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;
INT           dy;
GX_RECTANGLE *clip;
GX_RECTANGLE  rotated_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

    GX_SWAP_VALS(xstart, ystart);
    GX_SWAP_VALS(xend, yend);
    clip = context -> gx_draw_context_clip;

    if (context -> gx_draw_context_display -> gx_display_rotation_angle == GX_SCREEN_ROTATION_CW)
    {
        ystart = context -> gx_draw_context_canvas -> gx_canvas_x_resolution - ystart - 1;
        yend = context -> gx_draw_context_canvas -> gx_canvas_x_resolution - yend - 1;

        rotated_clip.gx_rectangle_left = clip -> gx_rectangle_top;
        rotated_clip.gx_rectangle_right = clip -> gx_rectangle_bottom;
        rotated_clip.gx_rectangle_top = (GX_VALUE)(context -> gx_draw_context_canvas -> gx_canvas_x_resolution - clip -> gx_rectangle_right - 1);
        rotated_clip.gx_rectangle_bottom = (GX_VALUE)(context -> gx_draw_context_canvas -> gx_canvas_x_resolution - clip -> gx_rectangle_left - 1);
    }
    else
    {
        xstart = context -> gx_draw_context_canvas -> gx_canvas_y_resolution - xstart - 1;
        xend = context -> gx_draw_context_canvas -> gx_canvas_y_resolution - xend - 1;

        rotated_clip.gx_rectangle_left = (GX_VALUE)(context -> gx_draw_context_canvas -> gx_canvas_y_resolution - clip -> gx_rectangle_bottom - 1);
        rotated_clip.gx_rectangle_right = (GX_VALUE)(context -> gx_draw_context_canvas -> gx_canvas_y_resolution - clip -> gx_rectangle_top - 1);
        rotated_clip.gx_rectangle_top = clip -> gx_rectangle_left;
        rotated_clip.gx_rectangle_bottom = clip -> gx_rectangle_right;
    }

    dx = GX_ABS(xend - xstart);
    dy = GX_ABS(yend - ystart);

    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(&rotated_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(&rotated_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(&rotated_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 >= rotated_clip.gx_rectangle_left &&
                        cury >= rotated_clip.gx_rectangle_top &&
                        cury <= rotated_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 <= rotated_clip.gx_rectangle_right &&
                        nexty >= rotated_clip.gx_rectangle_top &&
                        nexty <= rotated_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 >= rotated_clip.gx_rectangle_left &&
                        nextx <= rotated_clip.gx_rectangle_right &&
                        nexty <= rotated_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 >= rotated_clip.gx_rectangle_left &&
                        curx <= rotated_clip.gx_rectangle_right &&
                        cury >= rotated_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;
                }
            }
        }
        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(&rotated_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 >= rotated_clip.gx_rectangle_left &&
                        curx <= rotated_clip.gx_rectangle_right &&
                        cury >= rotated_clip.gx_rectangle_top &&
                        cury <= rotated_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(&rotated_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 >= rotated_clip.gx_rectangle_left &&
                        curx <= rotated_clip.gx_rectangle_right &&
                        cury >= rotated_clip.gx_rectangle_top &&
                        cury <= rotated_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_rotated_simple_line_draw PORTABLE C */
36			/* 6.1.4 */
37			/* AUTHOR */
38			/* */
39			/* Kenneth Maxwell, Microsoft Corporation */
40			/* */
41			/* DESCRIPTION */
42			/* */
43			/* Generic rotated 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		891	VOID _gx_display_driver_32bpp_rotated_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			ULONG *put;
85			ULONG *next_put;
86		891	GX_BOOL clipped = GX_TRUE;
87			INT dx;
88			INT dy;
89			GX_RECTANGLE *clip;
90			GX_RECTANGLE rotated_clip;
91		891	GX_COLOR linecolor = context -> gx_draw_context_brush.gx_brush_line_color;
92
93			#if defined GX_BRUSH_ALPHA_SUPPORT
94			GX_UBYTE alpha;
95
96		891	alpha = context -> gx_draw_context_brush.gx_brush_alpha;
97	✓✓	891	if (alpha == 0)
98			{
99
100			/* Nothing to drawn. Just return. */
101		80	return;
102			}
103	✓✓	851	if (alpha != 0xff)
104			{
105		40	_gx_display_driver_simple_line_alpha_draw(context, xstart, ystart, xend, yend, alpha);
106		40	return;
107			}
108			#endif
109
110		811	GX_SWAP_VALS(xstart, ystart);
111		811	GX_SWAP_VALS(xend, yend);
112		811	clip = context -> gx_draw_context_clip;
113
114	✓✓	811	if (context -> gx_draw_context_display -> gx_display_rotation_angle == GX_SCREEN_ROTATION_CW)
115			{
116		544	ystart = context -> gx_draw_context_canvas -> gx_canvas_x_resolution - ystart - 1;
117		544	yend = context -> gx_draw_context_canvas -> gx_canvas_x_resolution - yend - 1;
118
119		544	rotated_clip.gx_rectangle_left = clip -> gx_rectangle_top;
120		544	rotated_clip.gx_rectangle_right = clip -> gx_rectangle_bottom;
121		544	rotated_clip.gx_rectangle_top = (GX_VALUE)(context -> gx_draw_context_canvas -> gx_canvas_x_resolution - clip -> gx_rectangle_right - 1);
122		544	rotated_clip.gx_rectangle_bottom = (GX_VALUE)(context -> gx_draw_context_canvas -> gx_canvas_x_resolution - clip -> gx_rectangle_left - 1);
123			}
124			else
125			{
126		267	xstart = context -> gx_draw_context_canvas -> gx_canvas_y_resolution - xstart - 1;
127		267	xend = context -> gx_draw_context_canvas -> gx_canvas_y_resolution - xend - 1;
128
129		267	rotated_clip.gx_rectangle_left = (GX_VALUE)(context -> gx_draw_context_canvas -> gx_canvas_y_resolution - clip -> gx_rectangle_bottom - 1);
130		267	rotated_clip.gx_rectangle_right = (GX_VALUE)(context -> gx_draw_context_canvas -> gx_canvas_y_resolution - clip -> gx_rectangle_top - 1);
131		267	rotated_clip.gx_rectangle_top = clip -> gx_rectangle_left;
132		267	rotated_clip.gx_rectangle_bottom = clip -> gx_rectangle_right;
133			}
134
135		811	dx = GX_ABS(xend - xstart);
136		811	dy = GX_ABS(yend - ystart);
137
138	✓✓✓✓ ✓✓✓✓	811	if (((dx >= dy && (xstart > xend)) \|\| ((dy > dx) && ystart > yend)))
139			{
140		356	GX_SWAP_VALS(xend, xstart);
141		356	GX_SWAP_VALS(yend, ystart);
142			}
143		811	x_sign = (xend - xstart) / dx;
144		811	y_sign = (yend - ystart) / dy;
145
146	✓✓	811	if (y_sign > 0)
147			{
148		558	y_increment = context -> gx_draw_context_pitch;
149			}
150			else
151			{
152		253	y_increment = 0 - context -> gx_draw_context_pitch;
153			}
154
155		811	put = (ULONG )(context -> gx_draw_context_memory) + ystart context -> gx_draw_context_pitch + xstart;
156		811	next_put = (ULONG )(context -> gx_draw_context_memory) + yend context -> gx_draw_context_pitch + xend;
157
158
159		811	end_point.gx_point_x = (GX_VALUE)xstart;
160		811	end_point.gx_point_y = (GX_VALUE)ystart;
161
162	✓✓	811	if (_gx_utility_rectangle_point_detect(&rotated_clip, end_point))
163			{
164		781	end_point.gx_point_x = (GX_VALUE)xend;
165		781	end_point.gx_point_y = (GX_VALUE)yend;
166
167	✓✓	781	if (_gx_utility_rectangle_point_detect(&rotated_clip, end_point))
168			{
169		771	clipped = GX_FALSE;
170			}
171			}
172
173	✓✓	811	if (clipped)
174			{
175
176			/* Here if we must do clipping in the inner loop, because one
177			or both of the end points are outside clipping rectangle. */
178
179			/* Calculate the middle point of the line. */
180		40	mid_point.gx_point_x = (GX_VALUE)(xend + xstart) >> 1;
181		40	mid_point.gx_point_y = (GX_VALUE)(yend + ystart) >> 1;
182
183			/* Judge the clip in which side. */
184	✓✓	40	if (_gx_utility_rectangle_point_detect(&rotated_clip, mid_point))
185			{
186
187			/* The clip in two sides. */
188	✓✓	28	if (dx >= dy)
189			{
190
191			/* Walk out the clipping point. */
192	✓✓	199	for (curx = xstart, cury = ystart, decision = (dx >> 1); curx < mid_point.gx_point_x;
193		186	curx++, decision += dy)
194			{
195	✓✓	198	if (decision >= dx)
196			{
197		64	decision -= dx;
198		64	cury += y_sign;
199		64	put += y_increment;
200			}
201
202	✓✓	198	if (curx >= rotated_clip.gx_rectangle_left &&
203	✓✓	98	cury >= rotated_clip.gx_rectangle_top &&
204	✓✓	60	cury <= rotated_clip.gx_rectangle_bottom)
205			{
206		12	break;
207			}
208		186	put++;
209			}
210	✓✓	394	for (; curx <= mid_point.gx_point_x;
211		381	curx++, decision += dy)
212			{
213	✓✓	381	if (decision >= dx)
214			{
215		156	decision -= dx;
216		156	cury += y_sign;
217		156	put += y_increment;
218			}
219		381	PIXEL_WRITE(put, linecolor);
220		381	put++;
221			}
222	✓✓	212	for (nextx = xend, nexty = yend, decision = (dx >> 1); nextx > mid_point.gx_point_x;
223		199	nextx--, decision += dy)
224			{
225	✓✓	211	if (decision >= dx)
226			{
227		57	decision -= dx;
228		57	nexty -= y_sign;
229		57	next_put -= y_increment;
230			}
231	✓✓	211	if (nextx <= rotated_clip.gx_rectangle_right &&
232	✓✓	136	nexty >= rotated_clip.gx_rectangle_top &&
233	✓✓	88	nexty <= rotated_clip.gx_rectangle_bottom)
234			{
235		12	break;
236			}
237		199	next_put--;
238			}
239
240	✓✓	374	for (; nextx > mid_point.gx_point_x;
241		361	nextx--, decision += dy)
242			{
243	✓✓	361	if (decision >= dx)
244			{
245		160	decision -= dx;
246		160	nexty -= y_sign;
247		160	next_put -= y_increment;
248			}
249		361	PIXEL_WRITE(next_put, linecolor);
250		361	next_put--;
251			}
252			}
253			else
254			{
255	✓✓	435	for (nextx = xend, nexty = yend, decision = (dy >> 1); nexty > mid_point.gx_point_y;
256		420	nexty--, decision += dx)
257			{
258	✓✓	434	if (decision >= dy)
259			{
260		102	decision -= dy;
261		102	nextx -= x_sign;
262		102	next_put -= x_sign;
263			}
264	✓✓	434	if (nextx >= rotated_clip.gx_rectangle_left &&
265	✓✓	204	nextx <= rotated_clip.gx_rectangle_right &&
266	✓✓	156	nexty <= rotated_clip.gx_rectangle_bottom)
267			{
268		14	break;
269			}
270		420	next_put -= context -> gx_draw_context_pitch;
271			}
272
273	✓✓	1020	for (; nexty > mid_point.gx_point_y;
274		1005	nexty--, decision += dx)
275			{
276	✓✓	1005	if (decision >= dy)
277			{
278		291	decision -= dy;
279		291	nextx -= x_sign;
280		291	next_put -= x_sign;
281			}
282		1005	PIXEL_WRITE(next_put, linecolor);
283		1005	next_put -= context -> gx_draw_context_pitch;
284			}
285
286			/* Walk out the clipping point. */
287	✓✓	556	for (curx = xstart, cury = ystart, decision = (dy >> 1); cury < mid_point.gx_point_y;
288		541	cury++, decision += dx)
289			{
290	✓✓	555	if (decision >= dy)
291			{
292		126	decision -= dy;
293		126	curx += x_sign;
294		126	put += x_sign;
295			}
296
297	✓✓	555	if (curx >= rotated_clip.gx_rectangle_left &&
298	✓✓	507	curx <= rotated_clip.gx_rectangle_right &&
299	✓✓	173	cury >= rotated_clip.gx_rectangle_top)
300			{
301		14	break;
302			}
303		541	put += context -> gx_draw_context_pitch;
304			}
305	✓✓	908	for (; cury <= mid_point.gx_point_y;
306		893	cury++, decision += dx)
307			{
308	✓✓	893	if (decision >= dy)
309			{
310		267	decision -= dy;
311		267	curx += x_sign;
312		267	put += x_sign;
313			}
314		893	PIXEL_WRITE(put, linecolor);
315		893	put += context -> gx_draw_context_pitch;
316			}
317			}
318			}
319			else
320			{
321
322			/* The clip stay at one side. */
323	✓✓	12	if (dx >= dy)
324			{
325		6	half_rectangle.gx_rectangle_left = (GX_VALUE)xstart;
326		6	half_rectangle.gx_rectangle_right = mid_point.gx_point_x;
327	✓✓	6	if (y_sign == 1)
328			{
329		3	half_rectangle.gx_rectangle_top = (GX_VALUE)ystart;
330		3	half_rectangle.gx_rectangle_bottom = mid_point.gx_point_y;
331			}
332			else
333			{
334		3	half_rectangle.gx_rectangle_top = mid_point.gx_point_y;
335		3	half_rectangle.gx_rectangle_bottom = (GX_VALUE)ystart;
336			}
337
338	✓✓	6	if (_gx_utility_rectangle_overlap_detect(&rotated_clip, &half_rectangle, &half_over))
339			{
340		3	curx = xstart;
341		3	cury = ystart;
342		3	steps = mid_point.gx_point_x - curx + 1;
343		3	sign = 1;
344			}
345			else
346			{
347		3	curx = xend;
348		3	cury = yend;
349		3	steps = xend - mid_point.gx_point_x;
350		3	sign = -1;
351		3	y_increment = 0 - y_increment;
352		3	y_sign = 0 - y_sign;
353		3	put = next_put;
354			}
355	✓✓	793	for (decision = (dx >> 1); steps > 0; curx += sign, decision += dy, steps--)
356			{
357	✓✓	787	if (decision >= dx)
358			{
359		286	decision -= dx;
360		286	cury += y_sign;
361		286	put += y_increment;
362			}
363
364	✓✓	787	if (curx >= rotated_clip.gx_rectangle_left &&
365	✓✓	771	curx <= rotated_clip.gx_rectangle_right &&
366	✓✓	762	cury >= rotated_clip.gx_rectangle_top &&
367	✓✓	491	cury <= rotated_clip.gx_rectangle_bottom)
368			{
369		351	PIXEL_WRITE(put, linecolor);
370			}
371		787	put += sign;
372			}
373			}
374			else
375			{
376		6	half_rectangle.gx_rectangle_top = (GX_VALUE)ystart;
377		6	half_rectangle.gx_rectangle_bottom = mid_point.gx_point_y;
378	✓✓	6	if (x_sign == 1)
379			{
380		3	half_rectangle.gx_rectangle_right = mid_point.gx_point_x;
381		3	half_rectangle.gx_rectangle_left = (GX_VALUE)xstart;
382			}
383			else
384			{
385		3	half_rectangle.gx_rectangle_right = (GX_VALUE)xstart;
386		3	half_rectangle.gx_rectangle_left = mid_point.gx_point_x;
387			}
388
389	✓✓	6	if (_gx_utility_rectangle_overlap_detect(&rotated_clip, &half_rectangle, &half_over))
390			{
391		2	curx = xstart;
392		2	cury = ystart;
393		2	steps = mid_point.gx_point_y - cury + 1;
394		2	y_increment = context -> gx_draw_context_pitch;
395		2	sign = 1;
396			}
397			else
398			{
399		4	curx = xend;
400		4	cury = yend;
401		4	steps = yend - mid_point.gx_point_y;
402		4	sign = -1;
403		4	y_increment = 0 - context -> gx_draw_context_pitch;
404		4	x_sign = 0 - x_sign;
405		4	put = next_put;
406			}
407
408	✓✓	1474	for (decision = (dy >> 1); steps > 0; cury += sign, decision += dx, steps--)
409			{
410	✓✓	1468	if (decision >= dy)
411			{
412		372	decision -= dy;
413		372	curx += x_sign;
414		372	put += x_sign;
415			}
416	✓✓	1468	if (curx >= rotated_clip.gx_rectangle_left &&
417	✓✓	1450	curx <= rotated_clip.gx_rectangle_right &&
418	✓✓	1440	cury >= rotated_clip.gx_rectangle_top &&
419	✓✓	1240	cury <= rotated_clip.gx_rectangle_bottom)
420			{
421		1128	PIXEL_WRITE(put, linecolor);
422			}
423		1468	put += y_increment;
424			}
425			}
426			}
427			}
428			else
429			{
430
431			/* Here if both line ends lie within clipping rectangle, we can
432			run a faster inner loop. */
433	✓✓	771	if (dx >= dy)
434			{
435		372	put = (ULONG )(context -> gx_draw_context_memory) + ystart context -> gx_draw_context_pitch + xstart;
436		372	next_put = (ULONG )(context -> gx_draw_context_memory) + yend context -> gx_draw_context_pitch + xend;
437
438		372	for (curx = xstart, cury = ystart, nextx = xend, nexty = yend,
439	✓✓	33732	decision = (dx >> 1); curx <= nextx; curx++, nextx--,
440		33360	decision += dy)
441			{
442
443	✓✓	33360	if (decision >= dx)
444			{
445		14907	decision -= dx;
446		14907	cury += y_sign;
447		14907	nexty -= y_sign;
448
449		14907	put += y_increment;
450		14907	next_put -= y_increment;
451			}
452		33360	PIXEL_WRITE(put, linecolor);
453		33360	PIXEL_WRITE(next_put, linecolor);
454
455		33360	put++;
456		33360	next_put--;
457			}
458			}
459			else
460			{
461
462		399	for (curx = xstart, cury = ystart, nextx = xend, nexty = yend,
463	✓✓	36699	decision = (dy >> 1); cury <= nexty; cury++, nexty--,
464		36300	decision += dx)
465			{
466	✓✓	36300	if (decision >= dy)
467			{
468		14865	decision -= dy;
469		14865	curx += x_sign;
470		14865	nextx -= x_sign;
471
472		14865	put += x_sign;
473		14865	next_put -= x_sign;
474			}
475		36300	PIXEL_WRITE(put, linecolor);
476		36300	PIXEL_WRITE(next_put, linecolor);
477
478		36300	put += context -> gx_draw_context_pitch;
479		36300	next_put -= context -> gx_draw_context_pitch;
480			}
481			}
482			}
483			}
484