Head

GCC Code Coverage Report

Directory:	./		Exec	Total	Coverage
File:	gx_display_driver_8bpp_rotated_simple_line_draw.c	Lines:	212	212	100.0 %
Date:	2024-12-05 08:52:37	Branches:	122	122	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 PIXEL_WRITE(loc, val) (*(loc) = ((GX_UBYTE)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_8bpp_rotated_simple_line_draw    PORTABLE C      */
/*                                                           6.1.4        */
/*  AUTHOR                                                                */
/*                                                                        */
/*    Kenneth Maxwell, Microsoft Corporation                              */
/*                                                                        */
/*  DESCRIPTION                                                           */
/*                                                                        */
/*    Generic 8bpp color format rotated 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_ABS                                Compute the absolute value    */
/*    GX_SWAP_VALUE                         Swap two values               */
/*    [PIXEL_WRITE]                         Driver level pixel write      */
/*                                            routine                     */
/*                                                                        */
/*  CALLED BY                                                             */
/*                                                                        */
/*    GUIX Internal Code                                                  */
/*                                                                        */
/*  RELEASE HISTORY                                                       */
/*                                                                        */
/*    DATE              NAME                      DESCRIPTION             */
/*                                                                        */
/*  02-02-2021     Kenneth Maxwell          Initial Version 6.1.4         */
/*                                                                        */
/**************************************************************************/
VOID _gx_display_driver_8bpp_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;

GX_UBYTE     *put;
GX_UBYTE     *next_put;

GX_BOOL       clipped = GX_TRUE;
INT           dx;
INT           dy;

GX_RECTANGLE *clip = context -> gx_draw_context_clip;
GX_COLOR      linecolor = context -> gx_draw_context_brush.gx_brush_line_color;
GX_RECTANGLE  rotated_clip;

    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 = (GX_UBYTE *)(context -> gx_draw_context_memory) + ystart * context -> gx_draw_context_pitch + xstart;
    next_put = (GX_UBYTE *)(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 &rotated_clip in which side.  */
        if (_gx_utility_rectangle_point_detect(&rotated_clip, mid_point))
        {

            /* the &rotated_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 &rotated_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 = (GX_UBYTE *)(context -> gx_draw_context_memory) + ystart * context -> gx_draw_context_pitch + xstart;
            next_put = (GX_UBYTE *)(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			*
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
22			#define PIXEL_WRITE(loc, val) (*(loc) = ((GX_UBYTE)val))
23
24			#define GX_SOURCE_CODE
25
26			/* Include necessary system files. */
27
28			#include "gx_api.h"
29			#include "gx_utility.h"
30			#include "gx_display.h"
31
32			/**************************************************************************/
33			/* */
34			/* FUNCTION RELEASE */
35			/* */
36			/* _gx_display_driver_8bpp_rotated_simple_line_draw PORTABLE C */
37			/* 6.1.4 */
38			/* AUTHOR */
39			/* */
40			/* Kenneth Maxwell, Microsoft Corporation */
41			/* */
42			/* DESCRIPTION */
43			/* */
44			/* Generic 8bpp color format rotated line draw function. */
45			/* */
46			/* INPUT */
47			/* */
48			/* context Drawing context */
49			/* xstart x-coord of endpoint */
50			/* ystart y-coord of endpoint */
51			/* xend x-coord of endpoint */
52			/* yend y-coord of endpoint */
53			/* */
54			/* OUTPUT */
55			/* */
56			/* None */
57			/* */
58			/* CALLS */
59			/* */
60			/* GX_ABS Compute the absolute value */
61			/* GX_SWAP_VALUE Swap two values */
62			/* [PIXEL_WRITE] Driver level pixel write */
63			/* routine */
64			/* */
65			/* CALLED BY */
66			/* */
67			/* GUIX Internal Code */
68			/* */
69			/* RELEASE HISTORY */
70			/* */
71			/* DATE NAME DESCRIPTION */
72			/* */
73			/* 02-02-2021 Kenneth Maxwell Initial Version 6.1.4 */
74			/* */
75			/**************************************************************************/
76		544	VOID _gx_display_driver_8bpp_rotated_simple_line_draw(GX_DRAW_CONTEXT *context, INT xstart, INT ystart, INT xend, INT yend)
77			{
78
79			INT curx;
80			INT cury;
81			INT x_sign;
82			INT y_sign;
83			INT decision;
84			INT nextx;
85			INT nexty;
86			INT y_increment;
87			GX_POINT end_point;
88			GX_POINT mid_point;
89			GX_RECTANGLE half_rectangle;
90			GX_RECTANGLE half_over;
91			INT sign;
92			INT steps;
93
94			GX_UBYTE *put;
95			GX_UBYTE *next_put;
96
97		544	GX_BOOL clipped = GX_TRUE;
98			INT dx;
99			INT dy;
100
101		544	GX_RECTANGLE *clip = context -> gx_draw_context_clip;
102		544	GX_COLOR linecolor = context -> gx_draw_context_brush.gx_brush_line_color;
103			GX_RECTANGLE rotated_clip;
104
105		544	GX_SWAP_VALS(xstart, ystart);
106		544	GX_SWAP_VALS(xend, yend);
107		544	clip = context -> gx_draw_context_clip;
108
109	✓✓	544	if (context -> gx_draw_context_display -> gx_display_rotation_angle == GX_SCREEN_ROTATION_CW)
110			{
111		277	ystart = context -> gx_draw_context_canvas -> gx_canvas_x_resolution - ystart - 1;
112		277	yend = context -> gx_draw_context_canvas -> gx_canvas_x_resolution - yend - 1;
113
114		277	rotated_clip.gx_rectangle_left = clip -> gx_rectangle_top;
115		277	rotated_clip.gx_rectangle_right = clip -> gx_rectangle_bottom;
116		277	rotated_clip.gx_rectangle_top = (GX_VALUE)(context -> gx_draw_context_canvas -> gx_canvas_x_resolution - clip -> gx_rectangle_right - 1);
117		277	rotated_clip.gx_rectangle_bottom = (GX_VALUE)(context -> gx_draw_context_canvas -> gx_canvas_x_resolution - clip -> gx_rectangle_left - 1);
118			}
119			else
120			{
121		267	xstart = context -> gx_draw_context_canvas -> gx_canvas_y_resolution - xstart - 1;
122		267	xend = context -> gx_draw_context_canvas -> gx_canvas_y_resolution - xend - 1;
123
124		267	rotated_clip.gx_rectangle_left = (GX_VALUE)(context -> gx_draw_context_canvas -> gx_canvas_y_resolution - clip -> gx_rectangle_bottom - 1);
125		267	rotated_clip.gx_rectangle_right = (GX_VALUE)(context -> gx_draw_context_canvas -> gx_canvas_y_resolution - clip -> gx_rectangle_top - 1);
126		267	rotated_clip.gx_rectangle_top = clip -> gx_rectangle_left;
127		267	rotated_clip.gx_rectangle_bottom = clip -> gx_rectangle_right;
128			}
129
130		544	dx = GX_ABS(xend - xstart);
131		544	dy = GX_ABS(yend - ystart);
132
133	✓✓✓✓ ✓✓✓✓	544	if (((dx >= dy && (xstart > xend)) \|\| ((dy > dx) && ystart > yend)))
134			{
135		271	GX_SWAP_VALS(xend, xstart);
136		271	GX_SWAP_VALS(yend, ystart);
137			}
138		544	x_sign = (xend - xstart) / dx;
139		544	y_sign = (yend - ystart) / dy;
140
141	✓✓	544	if (y_sign > 0)
142			{
143		374	y_increment = context -> gx_draw_context_pitch;
144			}
145			else
146			{
147		170	y_increment = 0 - context -> gx_draw_context_pitch;
148			}
149
150		544	put = (GX_UBYTE )(context -> gx_draw_context_memory) + ystart context -> gx_draw_context_pitch + xstart;
151		544	next_put = (GX_UBYTE )(context -> gx_draw_context_memory) + yend context -> gx_draw_context_pitch + xend;
152
153
154		544	end_point.gx_point_x = (GX_VALUE)xstart;
155		544	end_point.gx_point_y = (GX_VALUE)ystart;
156
157	✓✓	544	if (_gx_utility_rectangle_point_detect(&rotated_clip, end_point))
158			{
159		523	end_point.gx_point_x = (GX_VALUE)xend;
160		523	end_point.gx_point_y = (GX_VALUE)yend;
161
162	✓✓	523	if (_gx_utility_rectangle_point_detect(&rotated_clip, end_point))
163			{
164		514	clipped = GX_FALSE;
165			}
166			}
167
168	✓✓	544	if (clipped)
169			{
170			/* here if we must do clipping in the inner loop, because one
171			or both of the end points are outside clipping rectangle */
172
173			/* Calculate the middle point of the line. */
174		30	mid_point.gx_point_x = (GX_VALUE)(xend + xstart) >> 1;
175		30	mid_point.gx_point_y = (GX_VALUE)(yend + ystart) >> 1;
176
177			/* Judge the &rotated_clip in which side. */
178	✓✓	30	if (_gx_utility_rectangle_point_detect(&rotated_clip, mid_point))
179			{
180
181			/* the &rotated_clip in two sides. */
182	✓✓	22	if (dx >= dy)
183			{
184			/* walk out the clipping point. */
185	✓✓	171	for (curx = xstart, cury = ystart, decision = (dx >> 1); curx < mid_point.gx_point_x;
186		161	curx++, decision += dy)
187			{
188	✓✓	170	if (decision >= dx)
189			{
190		47	decision -= dx;
191		47	cury += y_sign;
192		47	put += y_increment;
193			}
194
195	✓✓	170	if (curx >= rotated_clip.gx_rectangle_left &&
196	✓✓	95	cury >= rotated_clip.gx_rectangle_top &&
197	✓✓	57	cury <= rotated_clip.gx_rectangle_bottom)
198			{
199		9	break;
200			}
201		161	put++;
202			}
203	✓✓	295	for (; curx <= mid_point.gx_point_x;
204		285	curx++, decision += dy)
205			{
206	✓✓	285	if (decision >= dx)
207			{
208		113	decision -= dx;
209		113	cury += y_sign;
210		113	put += y_increment;
211			}
212		285	PIXEL_WRITE(put, linecolor);
213		285	put++;
214			}
215	✓✓	171	for (nextx = xend, nexty = yend, decision = (dx >> 1); nextx > mid_point.gx_point_x;
216		161	nextx--, decision += dy)
217			{
218	✓✓	170	if (decision >= dx)
219			{
220		47	decision -= dx;
221		47	nexty -= y_sign;
222		47	next_put -= y_increment;
223			}
224	✓✓	170	if (nextx <= rotated_clip.gx_rectangle_right &&
225	✓✓	95	nexty >= rotated_clip.gx_rectangle_top &&
226	✓✓	47	nexty <= rotated_clip.gx_rectangle_bottom)
227			{
228		9	break;
229			}
230		161	next_put--;
231			}
232
233	✓✓	289	for (; nextx > mid_point.gx_point_x;
234		279	nextx--, decision += dy)
235			{
236	✓✓	279	if (decision >= dx)
237			{
238		111	decision -= dx;
239		111	nexty -= y_sign;
240		111	next_put -= y_increment;
241			}
242		279	PIXEL_WRITE(next_put, linecolor);
243		279	next_put--;
244			}
245			}
246			else
247			{
248	✓✓	381	for (nextx = xend, nexty = yend, decision = (dy >> 1); nexty > mid_point.gx_point_y;
249		369	nexty--, decision += dx)
250			{
251	✓✓	380	if (decision >= dy)
252			{
253		86	decision -= dy;
254		86	nextx -= x_sign;
255		86	next_put -= x_sign;
256			}
257	✓✓	380	if (nextx >= rotated_clip.gx_rectangle_left &&
258	✓✓	176	nextx <= rotated_clip.gx_rectangle_right &&
259	✓✓	128	nexty <= rotated_clip.gx_rectangle_bottom)
260			{
261		11	break;
262			}
263		369	next_put -= context -> gx_draw_context_pitch;
264			}
265
266	✓✓	693	for (; nexty > mid_point.gx_point_y;
267		681	nexty--, decision += dx)
268			{
269	✓✓	681	if (decision >= dy)
270			{
271		196	decision -= dy;
272		196	nextx -= x_sign;
273		196	next_put -= x_sign;
274			}
275		681	PIXEL_WRITE(next_put, linecolor);
276		681	next_put -= context -> gx_draw_context_pitch;
277			}
278
279			/* walk out the clipping point. */
280	✓✓	381	for (curx = xstart, cury = ystart, decision = (dy >> 1); cury < mid_point.gx_point_y;
281		369	cury++, decision += dx)
282			{
283	✓✓	380	if (decision >= dy)
284			{
285		86	decision -= dy;
286		86	curx += x_sign;
287		86	put += x_sign;
288			}
289
290	✓✓	380	if (curx >= rotated_clip.gx_rectangle_left &&
291	✓✓	332	curx <= rotated_clip.gx_rectangle_right &&
292	✓✓	128	cury >= rotated_clip.gx_rectangle_top)
293			{
294		11	break;
295			}
296		369	put += context -> gx_draw_context_pitch;
297			}
298	✓✓	701	for (; cury <= mid_point.gx_point_y;
299		689	cury++, decision += dx)
300			{
301	✓✓	689	if (decision >= dy)
302			{
303		196	decision -= dy;
304		196	curx += x_sign;
305		196	put += x_sign;
306			}
307		689	PIXEL_WRITE(put, linecolor);
308		689	put += context -> gx_draw_context_pitch;
309			}
310			}
311			}
312			else
313			{
314			/* The &rotated_clip stay at one side. */
315	✓✓	8	if (dx >= dy)
316			{
317		4	half_rectangle.gx_rectangle_left = (GX_VALUE)xstart;
318		4	half_rectangle.gx_rectangle_right = mid_point.gx_point_x;
319	✓✓	4	if (y_sign == 1)
320			{
321		2	half_rectangle.gx_rectangle_top = (GX_VALUE)ystart;
322		2	half_rectangle.gx_rectangle_bottom = mid_point.gx_point_y;
323			}
324			else
325			{
326		2	half_rectangle.gx_rectangle_top = mid_point.gx_point_y;
327		2	half_rectangle.gx_rectangle_bottom = (GX_VALUE)ystart;
328			}
329
330	✓✓	4	if (_gx_utility_rectangle_overlap_detect(&rotated_clip, &half_rectangle, &half_over))
331			{
332		2	curx = xstart;
333		2	cury = ystart;
334		2	steps = mid_point.gx_point_x - curx + 1;
335		2	sign = 1;
336			}
337			else
338			{
339		2	curx = xend;
340		2	cury = yend;
341		2	steps = xend - mid_point.gx_point_x;
342		2	sign = -1;
343		2	y_increment = 0 - y_increment;
344		2	y_sign = 0 - y_sign;
345		2	put = next_put;
346			}
347	✓✓	529	for (decision = (dx >> 1); steps > 0; curx += sign, decision += dy, steps--)
348			{
349	✓✓	525	if (decision >= dx)
350			{
351		191	decision -= dx;
352		191	cury += y_sign;
353		191	put += y_increment;
354			}
355
356	✓✓	525	if (curx >= rotated_clip.gx_rectangle_left &&
357	✓✓	517	curx <= rotated_clip.gx_rectangle_right &&
358	✓✓	508	cury >= rotated_clip.gx_rectangle_top &&
359	✓✓	371	cury <= rotated_clip.gx_rectangle_bottom)
360			{
361		234	PIXEL_WRITE(put, linecolor);
362			}
363		525	put += sign;
364			}
365			}
366			else
367			{
368		4	half_rectangle.gx_rectangle_top = (GX_VALUE)ystart;
369		4	half_rectangle.gx_rectangle_bottom = mid_point.gx_point_y;
370	✓✓	4	if (x_sign == 1)
371			{
372		2	half_rectangle.gx_rectangle_right = mid_point.gx_point_x;
373		2	half_rectangle.gx_rectangle_left = (GX_VALUE)xstart;
374			}
375			else
376			{
377		2	half_rectangle.gx_rectangle_right = (GX_VALUE)xstart;
378		2	half_rectangle.gx_rectangle_left = mid_point.gx_point_x;
379			}
380
381	✓✓	4	if (_gx_utility_rectangle_overlap_detect(&rotated_clip, &half_rectangle, &half_over))
382			{
383		2	curx = xstart;
384		2	cury = ystart;
385		2	steps = mid_point.gx_point_y - cury + 1;
386		2	y_increment = context -> gx_draw_context_pitch;
387		2	sign = 1;
388			}
389			else
390			{
391		2	curx = xend;
392		2	cury = yend;
393		2	steps = yend - mid_point.gx_point_y;
394		2	sign = -1;
395		2	y_increment = 0 - context -> gx_draw_context_pitch;
396		2	x_sign = 0 - x_sign;
397		2	put = next_put;
398			}
399
400	✓✓	983	for (decision = (dy >> 1); steps > 0; cury += sign, decision += dx, steps--)
401			{
402	✓✓	979	if (decision >= dy)
403			{
404		248	decision -= dy;
405		248	curx += x_sign;
406		248	put += x_sign;
407			}
408	✓✓	979	if (curx >= rotated_clip.gx_rectangle_left &&
409	✓✓	970	curx <= rotated_clip.gx_rectangle_right &&
410	✓✓	960	cury >= rotated_clip.gx_rectangle_top &&
411	✓✓	856	cury <= rotated_clip.gx_rectangle_bottom)
412			{
413		752	PIXEL_WRITE(put, linecolor);
414			}
415		979	put += y_increment;
416			}
417			}
418			}
419			}
420			else
421			{
422			/* here if both line ends lie within clipping rectangle, we can
423			run a faster inner loop */
424	✓✓	514	if (dx >= dy)
425			{
426		248	put = (GX_UBYTE )(context -> gx_draw_context_memory) + ystart context -> gx_draw_context_pitch + xstart;
427		248	next_put = (GX_UBYTE )(context -> gx_draw_context_memory) + yend context -> gx_draw_context_pitch + xend;
428
429		248	for (curx = xstart, cury = ystart, nextx = xend, nexty = yend,
430	✓✓	22488	decision = (dx >> 1); curx <= nextx; curx++, nextx--,
431		22240	decision += dy)
432			{
433
434	✓✓	22240	if (decision >= dx)
435			{
436		9938	decision -= dx;
437		9938	cury += y_sign;
438		9938	nexty -= y_sign;
439
440		9938	put += y_increment;
441		9938	next_put -= y_increment;
442			}
443		22240	PIXEL_WRITE(put, linecolor);
444		22240	PIXEL_WRITE(next_put, linecolor);
445
446		22240	put++;
447		22240	next_put--;
448			}
449			}
450			else
451			{
452
453		266	for (curx = xstart, cury = ystart, nextx = xend, nexty = yend,
454	✓✓	24466	decision = (dy >> 1); cury <= nexty; cury++, nexty--,
455		24200	decision += dx)
456			{
457	✓✓	24200	if (decision >= dy)
458			{
459		9910	decision -= dy;
460		9910	curx += x_sign;
461		9910	nextx -= x_sign;
462
463		9910	put += x_sign;
464		9910	next_put -= x_sign;
465			}
466		24200	PIXEL_WRITE(put, linecolor);
467		24200	PIXEL_WRITE(next_put, linecolor);
468
469		24200	put += context -> gx_draw_context_pitch;
470		24200	next_put -= context -> gx_draw_context_pitch;
471			}
472			}
473			}
474		544	}
475