1/*
2 * Copyright 2005-2006 Luc Verhaegen.
3 *
4 * Permission is hereby granted, free of charge, to any person obtaining a
5 * copy of this software and associated documentation files (the "Software"),
6 * to deal in the Software without restriction, including without limitation
7 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
8 * and/or sell copies of the Software, and to permit persons to whom the
9 * Software is furnished to do so, subject to the following conditions:
10 *
11 * The above copyright notice and this permission notice shall be included in
12 * all copies or substantial portions of the Software.
13 *
14 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
15 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
16 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
17 * THE COPYRIGHT HOLDER(S) OR AUTHOR(S) BE LIABLE FOR ANY CLAIM, DAMAGES OR
18 * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
19 * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
20 * OTHER DEALINGS IN THE SOFTWARE.
21 *
22 */
23
24/* Standalone VESA CVT standard timing modelines generator. */
25
26#include "xf86.h"
27#include "xf86Modes.h"
28
29/* Error implementation used by the server code we built in */
30void
31Error(const char *str)
32{
33    perror(str);
34}
35
36/* FatalError implementation used by the server code we built in */
37void
38FatalError(const char *f, ...)
39{
40    va_list args;
41    va_start(args, f);
42    vfprintf(stderr, f, args);
43    va_end(args);
44    exit(1);
45}
46
47/* xnfalloc implementation used by the server code we built in */
48pointer
49XNFalloc(unsigned long n)
50{
51    pointer r;
52
53    r = malloc(n);
54    if (!r) {
55        perror("malloc failed");
56        exit(1);
57    }
58    return r;
59}
60
61/* xnfcalloc implementation used by the server code we built in */
62pointer
63XNFcalloc(unsigned long n)
64{
65    pointer r;
66
67    r = calloc(1, n);
68    if (!r) {
69        perror("calloc failed");
70        exit(1);
71    }
72    return r;
73}
74
75/*
76 * Quickly check wether this is a CVT standard mode.
77 */
78static Bool
79CVTCheckStandard(int HDisplay, int VDisplay, float VRefresh, Bool Reduced,
80                     Bool Verbose)
81{
82    Bool  IsCVT = TRUE;
83
84    if ((!(VDisplay % 3) && ((VDisplay * 4 / 3) == HDisplay)) ||
85        (!(VDisplay % 9) && ((VDisplay * 16 / 9) == HDisplay)) ||
86        (!(VDisplay % 10) && ((VDisplay * 16 / 10) == HDisplay)) ||
87        (!(VDisplay % 4) && ((VDisplay * 5 / 4) == HDisplay)) ||
88        (!(VDisplay % 9) && ((VDisplay * 15 / 9) == HDisplay)))
89        ;
90    else {
91        if (Verbose)
92            fprintf(stderr, "Warning: Aspect Ratio is not CVT standard.\n");
93        IsCVT = FALSE;
94    }
95
96    if ((VRefresh != 50.0) && (VRefresh != 60.0) &&
97        (VRefresh != 75.0) && (VRefresh != 85.0)) {
98        if (Verbose)
99            fprintf(stderr, "Warning: Refresh Rate is not CVT standard "
100                    "(50, 60, 75 or 85Hz).\n");
101        IsCVT = FALSE;
102    }
103
104    return IsCVT;
105}
106
107
108/*
109 * I'm not documenting --interlaced for obvious reasons, even though I did
110 * implement it. I also can't deny having looked at gtf here.
111 */
112static void
113PrintUsage(char *Name)
114{
115    fprintf(stderr, "\n");
116    fprintf(stderr, "usage: %s [-v|--verbose] [-r|--reduced] X Y [refresh]\n",
117            Name);
118    fprintf(stderr, "\n");
119    fprintf(stderr, " -v|--verbose : Warn about CVT standard adherance.\n");
120    fprintf(stderr, " -r|--reduced : Create a mode with reduced blanking "
121            "(default: normal blanking).\n");
122    fprintf(stderr, "            X : Desired horizontal resolution "
123            "(multiple of 8, required).\n");
124    fprintf(stderr, "            Y : Desired vertical resolution (required).\n");
125    fprintf(stderr, "      refresh : Desired refresh rate (default: 60.0Hz).\n");
126    fprintf(stderr, "\n");
127
128    fprintf(stderr, "Calculates VESA CVT (Coordinated Video Timing) modelines"
129	    " for use with X.\n");
130}
131
132
133/*
134 *
135 */
136static void
137PrintComment(DisplayModeRec *Mode, Bool CVT, Bool Reduced)
138{
139    printf("# %dx%d %.2f Hz ", Mode->HDisplay, Mode->VDisplay, Mode->VRefresh);
140
141    if (CVT) {
142        printf("(CVT %.2fM",
143               ((float) Mode->HDisplay * Mode->VDisplay) / 1000000.0);
144
145        if (!(Mode->VDisplay % 3) &&
146            ((Mode->VDisplay * 4 / 3) == Mode->HDisplay))
147            printf("3");
148        else if (!(Mode->VDisplay % 9) &&
149                 ((Mode->VDisplay * 16 / 9) == Mode->HDisplay))
150            printf("9");
151        else if (!(Mode->VDisplay % 10) &&
152                 ((Mode->VDisplay * 16 / 10) == Mode->HDisplay))
153            printf("A");
154        else if (!(Mode->VDisplay % 4) &&
155                 ((Mode->VDisplay * 5 / 4) == Mode->HDisplay))
156            printf("4");
157        else if (!(Mode->VDisplay % 9) &&
158                 ((Mode->VDisplay * 15 / 9) == Mode->HDisplay))
159            printf("9");
160
161        if (Reduced)
162            printf("-R");
163
164        printf(") ");
165    } else
166        printf("(CVT) ");
167
168    printf("hsync: %.2f kHz; ", Mode->HSync);
169    printf("pclk: %.2f MHz", ((float ) Mode->Clock) / 1000.0);
170
171    printf("\n");
172}
173
174
175/*
176 * Originally grabbed from xf86Mode.c.
177 *
178 * Ignoring the actual Mode->name, as the user will want something solid
179 * to grab hold of.
180 */
181static void
182PrintModeline(DisplayModePtr Mode, int HDisplay, int VDisplay, float VRefresh,
183              Bool Reduced)
184{
185    if (Reduced)
186        printf("Modeline \"%dx%dR\"  ", HDisplay, VDisplay);
187    else
188        printf("Modeline \"%dx%d_%.2f\"  ", HDisplay, VDisplay, VRefresh);
189
190    printf("%6.2f  %i %i %i %i  %i %i %i %i", Mode->Clock/1000., Mode->HDisplay,
191           Mode->HSyncStart, Mode->HSyncEnd, Mode->HTotal, Mode->VDisplay,
192           Mode->VSyncStart, Mode->VSyncEnd, Mode->VTotal);
193
194    if (Mode->Flags & V_INTERLACE)
195        printf(" interlace");
196    if (Mode->Flags & V_PHSYNC)
197        printf(" +hsync");
198    if (Mode->Flags & V_NHSYNC)
199        printf(" -hsync");
200    if (Mode->Flags & V_PVSYNC)
201        printf(" +vsync");
202    if (Mode->Flags & V_NVSYNC)
203        printf(" -vsync");
204
205    printf("\n");
206}
207
208
209/*
210 *
211 */
212int
213main (int argc, char *argv[])
214{
215    DisplayModeRec  *Mode;
216    int  HDisplay = 0, VDisplay = 0;
217    float  VRefresh = 0.0;
218    Bool  Reduced = FALSE, Verbose = FALSE, IsCVT;
219    Bool  Interlaced = FALSE;
220    int  n;
221
222    if ((argc < 3) || (argc > 7)) {
223        PrintUsage(argv[0]);
224        return 1;
225    }
226
227    /* This doesn't filter out bad flags properly. Bad flags get passed down
228     * to atoi/atof, which then return 0, so that these variables can get
229     * filled next time round. So this is just a cosmetic problem.
230     */
231    for (n = 1; n < argc; n++) {
232        if (!strcmp(argv[n], "-r") || !strcmp(argv[n], "--reduced"))
233            Reduced = TRUE;
234        else if (!strcmp(argv[n], "-i") || !strcmp(argv[n], "--interlaced"))
235            Interlaced = TRUE;
236        else if (!strcmp(argv[n], "-v") || !strcmp(argv[n], "--verbose"))
237            Verbose = TRUE;
238        else if (!strcmp(argv[n], "-h") || !strcmp(argv[n], "--help")) {
239            PrintUsage(argv[0]);
240            return 0;
241        } else if (!HDisplay) {
242            HDisplay = atoi(argv[n]);
243	    if (!HDisplay) {
244		PrintUsage(argv[0]);
245		return 1;
246	    }
247	}
248        else if (!VDisplay) {
249            VDisplay = atoi(argv[n]);
250	    if (!VDisplay) {
251		PrintUsage(argv[0]);
252		return 1;
253	    }
254	}
255        else if (!VRefresh) {
256            VRefresh = atof(argv[n]);
257	    if (!VRefresh) {
258		PrintUsage(argv[0]);
259		return 1;
260	    }
261	}
262        else {
263            PrintUsage(argv[0]);
264            return 1;
265        }
266    }
267
268    if (!HDisplay || !VDisplay) {
269        PrintUsage(argv[0]);
270        return 0;
271    }
272
273    /* Default to 60.0Hz */
274    if (!VRefresh)
275        VRefresh = 60.0;
276
277    /* Horizontal timing is always a multiple of 8: round up. */
278    if (HDisplay & 0x07) {
279        HDisplay &= ~0x07;
280        HDisplay += 8;
281    }
282
283    if (Reduced) {
284	if ((VRefresh / 60.0) != floor(VRefresh / 60.0)) {
285	    fprintf(stderr,
286		    "\nERROR: Multiple of 60Hz refresh rate required for "
287		    " reduced blanking.\n");
288	    PrintUsage(argv[0]);
289	    return 0;
290	}
291    }
292
293    IsCVT = CVTCheckStandard(HDisplay, VDisplay, VRefresh, Reduced, Verbose);
294
295    Mode = xf86CVTMode(HDisplay, VDisplay, VRefresh, Reduced, Interlaced);
296
297    PrintComment(Mode, IsCVT, Reduced);
298    PrintModeline(Mode, HDisplay, VDisplay, VRefresh, Reduced);
299
300    return 0;
301}
302