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0a768a5a7f
LookingGlass/client/src/config.c
Geoffrey McRae 0a768a5a7f [client] main: add new option for integer only upscaling 
The new option `win:intUpscale` will limit upscaling to integer sizes
only if enabled.
2022-05-09 18:23:53 +10:00

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/**
* Looking Glass
* Copyright © 2017-2022 The Looking Glass Authors
* https://looking-glass.io
*
* This program is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License as published by the Free
* Software Foundation; either version 2 of the License, or (at your option)
* any later version.
*
* This program is distributed in the hope that it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
* more details.
*
* You should have received a copy of the GNU General Public License along
* with this program; if not, write to the Free Software Foundation, Inc., 59
* Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
#include "main.h"
#include "config.h"
#include "kb.h"
#include "common/option.h"
#include "common/debug.h"
#include "common/paths.h"
#include "common/stringutils.h"
#include <sys/stat.h>
#include <pwd.h>
#include <unistd.h>
#include <string.h>
// forwards
static bool optRendererParse (struct Option * opt, const char * str);
static StringList optRendererValues (struct Option * opt);
static char * optRendererToString(struct Option * opt);
static bool optPosParse (struct Option * opt, const char * str);
static StringList optPosValues (struct Option * opt);
static char * optPosToString (struct Option * opt);
static bool optSizeParse (struct Option * opt, const char * str);
static StringList optSizeValues (struct Option * opt);
static char * optSizeToString (struct Option * opt);
static bool optScancodeValidate(struct Option * opt, const char ** error);
static char * optScancodeToString(struct Option * opt);
static bool optRotateValidate (struct Option * opt, const char ** error);
static void doLicense(void);
static struct Option options[] =
{
// app options
{
.module = "app",
.name = "configFile",
.description = "A file to read additional configuration from",
.shortopt = 'C',
.type = OPTION_TYPE_STRING,
.value.x_string = NULL,
},
{
.module = "app",
.name = "renderer",
.description = "Specify the renderer to use",
.shortopt = 'g',
.type = OPTION_TYPE_CUSTOM,
.parser = optRendererParse,
.getValues = optRendererValues,
.toString = optRendererToString
},
{
.module = "app",
.name = "license",
.description = "Show the license for this application and then terminate",
.shortopt = 'l',
.type = OPTION_TYPE_BOOL,
.value.x_bool = false,
},
{
.module = "app",
.name = "cursorPollInterval",
.description = "How often to check for a cursor update in microseconds",
.type = OPTION_TYPE_INT,
.value.x_int = 1000
},
{
.module = "app",
.name = "framePollInterval",
.description = "How often to check for a frame update in microseconds",
.type = OPTION_TYPE_INT,
.value.x_int = 1000
},
{
.module = "app",
.name = "allowDMA",
.description = "Allow direct DMA transfers if supported (see `README.md` in the `module` dir)",
.type = OPTION_TYPE_BOOL,
.value.x_bool = true
},
// window options
{
.module = "win",
.name = "title",
.description = "The window title",
.type = OPTION_TYPE_STRING,
.value.x_string = "Looking Glass (client)"
},
{
.module = "win",
.name = "position",
.description = "Initial window position at startup",
.type = OPTION_TYPE_CUSTOM,
.parser = optPosParse,
.getValues = optPosValues,
.toString = optPosToString
},
{
.module = "win",
.name = "size",
.description = "Initial window size at startup",
.type = OPTION_TYPE_CUSTOM,
.parser = optSizeParse,
.getValues = optSizeValues,
.toString = optSizeToString
},
{
.module = "win",
.name = "autoResize",
.description = "Auto resize the window to the guest",
.shortopt = 'a',
.type = OPTION_TYPE_BOOL,
.value.x_bool = false,
},
{
.module = "win",
.name = "allowResize",
.description = "Allow the window to be manually resized",
.shortopt = 'n',
.type = OPTION_TYPE_BOOL,
.value.x_bool = true,
},
{
.module = "win",
.name = "keepAspect",
.description = "Maintain the correct aspect ratio",
.shortopt = 'r',
.type = OPTION_TYPE_BOOL,
.value.x_bool = true,
},
{
.module = "win",
.name = "forceAspect",
.description = "Force the window to maintain the aspect ratio",
.type = OPTION_TYPE_BOOL,
.value.x_bool = true,
},
{
.module = "win",
.name = "dontUpscale",
.description = "Never try to upscale the window",
.type = OPTION_TYPE_BOOL,
.value.x_bool = false,
},
{
.module = "win",
.name = "intUpscale",
.description = "Allow only integer upscaling",
.type = OPTION_TYPE_BOOL,
.value.x_bool = false,
},
{
.module = "win",
.name = "shrinkOnUpscale",
.description = "Limit the window dimensions when dontUpscale is enabled",
.type = OPTION_TYPE_BOOL,
.value.x_bool = false,
},
{
.module = "win",
.name = "borderless",
.description = "Borderless mode",
.shortopt = 'd',
.type = OPTION_TYPE_BOOL,
.value.x_bool = false,
},
{
.module = "win",
.name = "fullScreen",
.description = "Launch in fullscreen borderless mode",
.shortopt = 'F',
.type = OPTION_TYPE_BOOL,
.value.x_bool = false,
},
{
.module = "win",
.name = "maximize",
.description = "Launch window maximized",
.shortopt = 'T',
.type = OPTION_TYPE_BOOL,
.value.x_bool = false,
},
{
.module = "win",
.name = "minimizeOnFocusLoss",
.description = "Minimize window on focus loss",
.type = OPTION_TYPE_BOOL,
.value.x_bool = false,
},
{
.module = "win",
.name = "fpsMin",
.description = "Frame rate minimum (0 = disable - not recommended, -1 = auto detect)",
.shortopt = 'K',
.type = OPTION_TYPE_INT,
.value.x_int = -1,
},
{
.module = "win",
.name = "ignoreQuit",
.description = "Ignore requests to quit (i.e. Alt+F4)",
.shortopt = 'Q',
.type = OPTION_TYPE_BOOL,
.value.x_bool = false,
},
{
.module = "win",
.name = "noScreensaver",
.description = "Prevent the screensaver from starting",
.shortopt = 'S',
.type = OPTION_TYPE_BOOL,
.value.x_bool = false,
},
{
.module = "win",
.name = "autoScreensaver",
.description = "Prevent the screensaver from starting when guest requests it",
.type = OPTION_TYPE_BOOL,
.value.x_bool = false,
},
{
.module = "win",
.name = "alerts",
.description = "Show on screen alert messages",
.shortopt = 'q',
.type = OPTION_TYPE_BOOL,
.value.x_bool = true,
},
{
.module = "win",
.name = "quickSplash",
.description = "Skip fading out the splash screen when a connection is established",
.type = OPTION_TYPE_BOOL,
.value.x_bool = false,
},
{
.module = "win",
.name = "rotate",
.description = "Rotate the displayed image (0, 90, 180, 270)",
.type = OPTION_TYPE_INT,
.validator = optRotateValidate,
.value.x_int = 0,
},
{
.module = "win",
.name = "uiFont",
.description = "The font to use when rendering on-screen UI",
.type = OPTION_TYPE_STRING,
.value.x_string = "DejaVu Sans Mono",
},
{
.module = "win",
.name = "uiSize",
.description = "The font size to use when rendering on-screen UI",
.type = OPTION_TYPE_INT,
.value.x_int = 14
},
{
.module = "win",
.name = "jitRender",
.description = "Enable just-in-time rendering",
.type = OPTION_TYPE_BOOL,
.value.x_bool = false,
},
// input options
{
.module = "input",
.name = "grabKeyboard",
.description = "Grab the keyboard in capture mode",
.shortopt = 'G',
.type = OPTION_TYPE_BOOL,
.value.x_bool = true,
},
{
.module = "input",
.name = "grabKeyboardOnFocus",
.description = "Grab the keyboard when focused",
.type = OPTION_TYPE_BOOL,
.value.x_bool = false,
},
{
.module = "input",
.name = "releaseKeysOnFocusLoss",
.description = "On focus loss, send key up events to guest for all held keys",
.type = OPTION_TYPE_BOOL,
.value.x_bool = true
},
{
.module = "input",
.name = "escapeKey",
.description = "Specify the escape key, see <linux/input-event-codes.h> for valid values",
.shortopt = 'm',
.type = OPTION_TYPE_INT,
.value.x_int = KEY_SCROLLLOCK,
.validator = optScancodeValidate,
.toString = optScancodeToString,
},
{
.module = "input",
.name = "ignoreWindowsKeys",
.description = "Do not pass events for the windows keys to the guest",
.type = OPTION_TYPE_BOOL,
.value.x_bool = false
},
{
.module = "input",
.name = "hideCursor",
.description = "Hide the local mouse cursor",
.shortopt = 'M',
.type = OPTION_TYPE_BOOL,
.value.x_bool = true,
},
{
.module = "input",
.name = "mouseSens",
.description = "Initial mouse sensitivity when in capture mode (-9 to 9)",
.type = OPTION_TYPE_INT,
.value.x_int = 0,
},
{
.module = "input",
.name = "mouseSmoothing",
.description = "Apply simple mouse smoothing when rawMouse is not in use (helps reduce aliasing)",
.type = OPTION_TYPE_BOOL,
.value.x_bool = true,
},
{
.module = "input",
.name = "rawMouse",
.description = "Use RAW mouse input when in capture mode (good for gaming)",
.type = OPTION_TYPE_BOOL,
.value.x_bool = false,
},
{
.module = "input",
.name = "mouseRedraw",
.description = "Mouse movements trigger redraws (ignores FPS minimum)",
.type = OPTION_TYPE_BOOL,
.value.x_bool = true,
},
{
.module = "input",
.name = "autoCapture",
.description = "Try to keep the mouse captured when needed",
.type = OPTION_TYPE_BOOL,
.value.x_bool = false
},
{
.module = "input",
.name = "captureOnly",
.description = "Only enable input via SPICE if in capture mode",
.type = OPTION_TYPE_BOOL,
.value.x_bool = false
},
{
.module = "input",
.name = "helpMenuDelay",
.description = "Show help menu after holding down the escape key for this many milliseconds",
.type = OPTION_TYPE_INT,
.value.x_int = 200
},
// spice options
{
.module = "spice",
.name = "enable",
.description = "Enable the built in SPICE client for input and/or clipboard support",
.shortopt = 's',
.type = OPTION_TYPE_BOOL,
.value.x_bool = true
},
{
.module = "spice",
.name = "host",
.description = "The SPICE server host or UNIX socket",
.shortopt = 'c',
.type = OPTION_TYPE_STRING,
.value.x_string = "127.0.0.1"
},
{
.module = "spice",
.name = "port",
.description = "The SPICE server port (0 = unix socket)",
.shortopt = 'p',
.type = OPTION_TYPE_INT,
.value.x_int = 5900
},
{
.module = "spice",
.name = "input",
.description = "Use SPICE to send keyboard and mouse input events to the guest",
.type = OPTION_TYPE_BOOL,
.value.x_bool = true
},
{
.module = "spice",
.name = "clipboard",
.description = "Use SPICE to synchronize the clipboard contents with the guest",
.type = OPTION_TYPE_BOOL,
.value.x_bool = true
},
{
.module = "spice",
.name = "clipboardToVM",
.description = "Allow the clipboard to be synchronized TO the VM",
.type = OPTION_TYPE_BOOL,
.value.x_bool = true
},
{
.module = "spice",
.name = "clipboardToLocal",
.description = "Allow the clipboard to be synchronized FROM the VM",
.type = OPTION_TYPE_BOOL,
.value.x_bool = true
},
{
.module = "spice",
.name = "audio",
.description = "Enable SPICE audio support",
.type = OPTION_TYPE_BOOL,
.value.x_bool = true
},
{
.module = "spice",
.name = "scaleCursor",
.description = "Scale cursor input position to screen size when up/down scaled",
.shortopt = 'j',
.type = OPTION_TYPE_BOOL,
.value.x_bool = true
},
{
.module = "spice",
.name = "captureOnStart",
.description = "Capture mouse and keyboard on start",
.type = OPTION_TYPE_BOOL,
.value.x_bool = false
},
{
.module = "spice",
.name = "alwaysShowCursor",
.description = "Always show host cursor",
.type = OPTION_TYPE_BOOL,
.value.x_bool = false
},
{
.module = "spice",
.name = "showCursorDot",
.description = "Use a \"dot\" cursor when the window does not have focus",
.type = OPTION_TYPE_BOOL,
.value.x_bool = true
},
// audio options
{
.module = "audio",
.name = "periodSize",
.description = "Requested audio device period size in samples",
.type = OPTION_TYPE_INT,
.value.x_int = 2048
},
{
.module = "audio",
.name = "bufferLatency",
.description = "Additional buffer latency in milliseconds",
.type = OPTION_TYPE_INT,
.value.x_int = 13
},
{
.module = "audio",
.name = "micAlwaysAllow",
.description = "Always allow guest attempts to access the microphone",
.type = OPTION_TYPE_BOOL,
.value.x_bool = false
},
{
.module = "audio",
.name = "micShowIndicator",
.description = "Display microphone usage indicator",
.type = OPTION_TYPE_BOOL,
.value.x_bool = true
},
{0}
};
void config_init(void)
{
g_params.center = true;
g_params.w = 1024;
g_params.h = 768;
option_register(options);
}
bool config_load(int argc, char * argv[])
{
// load any global options first
struct stat st;
if (stat("/etc/looking-glass-client.ini", &st) >= 0 && S_ISREG(st.st_mode))
{
DEBUG_INFO("Loading config from: /etc/looking-glass-client.ini");
if (!option_load("/etc/looking-glass-client.ini"))
return false;
}
// load config from user's home directory
struct passwd * pw = getpwuid(getuid());
if (!pw)
DEBUG_WARN("getpwuid failed, unable to load user configuration");
else
{
char * localFile;
alloc_sprintf(&localFile, "%s/.looking-glass-client.ini", pw->pw_dir);
if (!localFile)
{
DEBUG_ERROR("out of memory");
return false;
}
if (stat(localFile, &st) >= 0 && S_ISREG(st.st_mode))
{
DEBUG_INFO("Loading config from: %s", localFile);
if (!option_load(localFile))
{
free(localFile);
return false;
}
}
free(localFile);
}
// load config from XDG_CONFIG_HOME
char * xdgFile;
alloc_sprintf(&xdgFile, "%s/client.ini", lgConfigDir());
if (!xdgFile)
{
DEBUG_ERROR("out of memory");
return false;
}
if (xdgFile && stat(xdgFile, &st) >= 0 && S_ISREG(st.st_mode))
{
DEBUG_INFO("Loading config from: %s", xdgFile);
if (!option_load(xdgFile))
{
free(xdgFile);
return false;
}
}
free(xdgFile);
// parse the command line arguments
if (!option_parse(argc, argv))
return false;
// if a file was specified to also load, do it
const char * configFile = option_get_string("app", "configFile");
if (configFile)
{
if (stat(configFile, &st) < 0 || !S_ISREG(st.st_mode))
{
DEBUG_ERROR("app:configFile set to invalid file: %s", configFile);
return false;
}
DEBUG_INFO("Loading config from: %s", configFile);
if (!option_load(configFile))
return false;
}
// validate the values are sane
if (!option_validate())
return false;
if (option_get_bool("app", "license"))
{
doLicense();
return false;
}
// setup the application params for the basic types
g_params.cursorPollInterval = option_get_int ("app" , "cursorPollInterval");
g_params.framePollInterval = option_get_int ("app" , "framePollInterval" );
g_params.allowDMA = option_get_bool ("app" , "allowDMA" );
g_params.windowTitle = option_get_string("win", "title" );
g_params.autoResize = option_get_bool ("win", "autoResize" );
g_params.allowResize = option_get_bool ("win", "allowResize" );
g_params.keepAspect = option_get_bool ("win", "keepAspect" );
g_params.forceAspect = option_get_bool ("win", "forceAspect" );
g_params.dontUpscale = option_get_bool ("win", "dontUpscale" );
g_params.intUpscale = option_get_bool ("win", "intUpscale" );
g_params.shrinkOnUpscale = option_get_bool ("win", "shrinkOnUpscale");
g_params.borderless = option_get_bool ("win", "borderless" );
g_params.fullscreen = option_get_bool ("win", "fullScreen" );
g_params.maximize = option_get_bool ("win", "maximize" );
g_params.fpsMin = option_get_int ("win", "fpsMin" );
g_params.ignoreQuit = option_get_bool ("win", "ignoreQuit" );
g_params.noScreensaver = option_get_bool ("win", "noScreensaver" );
g_params.autoScreensaver = option_get_bool ("win", "autoScreensaver");
g_params.showAlerts = option_get_bool ("win", "alerts" );
g_params.quickSplash = option_get_bool ("win", "quickSplash" );
g_params.uiFont = option_get_string("win" , "uiFont" );
g_params.uiSize = option_get_int ("win" , "uiSize" );
g_params.jitRender = option_get_bool ("win" , "jitRender" );
if (g_params.noScreensaver && g_params.autoScreensaver)
{
DEBUG_WARN("win:noScreensaver (-S) and win:autoScreensaver "
"can't be used simultaneously");
return false;
}
switch(option_get_int("win", "rotate"))
{
case 0 : g_params.winRotate = LG_ROTATE_0 ; break;
case 90 : g_params.winRotate = LG_ROTATE_90 ; break;
case 180: g_params.winRotate = LG_ROTATE_180; break;
case 270: g_params.winRotate = LG_ROTATE_270; break;
}
g_params.grabKeyboard = option_get_bool("input", "grabKeyboard" );
g_params.grabKeyboardOnFocus = option_get_bool("input", "grabKeyboardOnFocus" );
g_params.releaseKeysOnFocusLoss = option_get_bool("input", "releaseKeysOnFocusLoss");
g_params.escapeKey = option_get_int ("input", "escapeKey" );
g_params.ignoreWindowsKeys = option_get_bool("input", "ignoreWindowsKeys" );
g_params.hideMouse = option_get_bool("input", "hideCursor" );
g_params.mouseSens = option_get_int ("input", "mouseSens" );
g_params.mouseSmoothing = option_get_bool("input", "mouseSmoothing" );
g_params.rawMouse = option_get_bool("input", "rawMouse" );
g_params.mouseRedraw = option_get_bool("input", "mouseRedraw" );
g_params.autoCapture = option_get_bool("input", "autoCapture" );
g_params.captureInputOnly = option_get_bool("input", "captureOnly" );
if (g_params.jitRender && !g_params.mouseRedraw)
{
DEBUG_WARN("win:jitRender is enabled, forcing input:mouseRedraw");
g_params.mouseRedraw = true;
}
g_params.helpMenuDelayUs = option_get_int("input", "helpMenuDelay") * (uint64_t) 1000;
g_params.minimizeOnFocusLoss = option_get_bool("win", "minimizeOnFocusLoss");
if (option_get_bool("spice", "enable"))
{
g_params.spiceHost = option_get_string("spice", "host");
g_params.spicePort = option_get_int ("spice", "port");
g_params.useSpiceInput = option_get_bool("spice", "input" );
g_params.useSpiceClipboard = option_get_bool("spice", "clipboard");
g_params.useSpiceAudio = option_get_bool("spice", "audio" );
if (g_params.useSpiceClipboard)
{
g_params.clipboardToVM = option_get_bool("spice", "clipboardToVM" );
g_params.clipboardToLocal = option_get_bool("spice", "clipboardToLocal");
g_params.useSpiceClipboard = g_params.clipboardToVM || g_params.clipboardToLocal;
}
else
{
g_params.clipboardToVM = false;
g_params.clipboardToLocal = false;
}
g_params.scaleMouseInput = option_get_bool("spice", "scaleCursor");
g_params.captureOnStart = option_get_bool("spice", "captureOnStart");
g_params.alwaysShowCursor = option_get_bool("spice", "alwaysShowCursor");
g_params.showCursorDot = option_get_bool("spice", "showCursorDot");
}
g_params.audioPeriodSize = option_get_int("audio", "periodSize");
g_params.audioBufferLatency = option_get_int("audio", "bufferLatency");
g_params.micAlwaysAllow = option_get_bool("audio", "micAlwaysAllow");
g_params.micShowIndicator = option_get_bool("audio", "micShowIndicator");
return true;
}
void config_free(void)
{
option_free();
}
static void doLicense(void)
{
fprintf(stderr,
// BEGIN LICENSE BLOCK
"\n"
"Looking Glass\n"
"Copyright © 2017-2022 The Looking Glass Authors\n"
"https://looking-glass.io\n"
"\n"
"This program is free software; you can redistribute it and/or modify it under\n"
"the terms of the GNU General Public License as published by the Free Software\n"
"Foundation; either version 2 of the License, or (at your option) any later\n"
"version.\n"
"\n"
"This program is distributed in the hope that it will be useful, but WITHOUT ANY\n"
"WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A\n"
"PARTICULAR PURPOSE. See the GNU General Public License for more details.\n"
"\n"
"You should have received a copy of the GNU General Public License along with\n"
"this program; if not, write to the Free Software Foundation, Inc., 59 Temple\n"
"Place, Suite 330, Boston, MA 02111-1307 USA\n"
"\n"
// END LICENSE BLOCK
);
}
static bool optRendererParse(struct Option * opt, const char * str)
{
if (!str)
return false;
if (strcasecmp(str, "auto") == 0)
{
g_params.forceRenderer = false;
return true;
}
for(unsigned int i = 0; i < LG_RENDERER_COUNT; ++i)
if (strcasecmp(str, LG_Renderers[i]->getName()) == 0)
{
g_params.forceRenderer = true;
g_params.forceRendererIndex = i;
return true;
}
return false;
}
static StringList optRendererValues(struct Option * opt)
{
StringList sl = stringlist_new(false);
if (!sl)
return NULL;
// this typecast is safe as the stringlist doesn't own the values
for(unsigned int i = 0; i < LG_RENDERER_COUNT; ++i)
stringlist_push(sl, (char *)LG_Renderers[i]->getName());
return sl;
}
static char * optRendererToString(struct Option * opt)
{
if (!g_params.forceRenderer)
return strdup("auto");
if (g_params.forceRendererIndex >= LG_RENDERER_COUNT)
return NULL;
return strdup(LG_Renderers[g_params.forceRendererIndex]->getName());
}
static bool optPosParse(struct Option * opt, const char * str)
{
if (!str)
return false;
if (strcmp(str, "center") == 0)
{
g_params.center = true;
return true;
}
if (sscanf(str, "%dx%d", &g_params.x, &g_params.y) == 2)
{
g_params.center = false;
return true;
}
return false;
}
static StringList optPosValues(struct Option * opt)
{
StringList sl = stringlist_new(false);
if (!sl)
return NULL;
stringlist_push(sl, "center");
stringlist_push(sl, "<left>x<top>, e.g. 100x100");
return sl;
}
static char * optPosToString(struct Option * opt)
{
if (g_params.center)
return strdup("center");
int len = snprintf(NULL, 0, "%dx%d", g_params.x, g_params.y);
char * str = malloc(len + 1);
if (!str)
{
DEBUG_ERROR("out of memory");
return NULL;
}
sprintf(str, "%dx%d", g_params.x, g_params.y);
return str;
}
static bool optSizeParse(struct Option * opt, const char * str)
{
if (!str)
return false;
if (sscanf(str, "%ux%u", &g_params.w, &g_params.h) == 2)
{
if (g_params.w < 1 || g_params.h < 1)
return false;
return true;
}
return false;
}
static StringList optSizeValues(struct Option * opt)
{
StringList sl = stringlist_new(false);
if (!sl)
return NULL;
stringlist_push(sl, "<left>x<top>, e.g. 100x100");
return sl;
}
static char * optSizeToString(struct Option * opt)
{
int len = snprintf(NULL, 0, "%ux%u", g_params.w, g_params.h);
char * str = malloc(len + 1);
if (!str)
{
DEBUG_ERROR("out of memory");
return NULL;
}
sprintf(str, "%ux%u", g_params.w, g_params.h);
return str;
}
static bool optScancodeValidate(struct Option * opt, const char ** error)
{
if (opt->value.x_int >= 0 && opt->value.x_int < KEY_MAX)
return true;
*error = "Out of range";
return false;
}
static char * optScancodeToString(struct Option * opt)
{
char * str;
alloc_sprintf(&str, "%d = %s", opt->value.x_int,
linux_to_str[opt->value.x_int]);
return str;
}
static bool optRotateValidate(struct Option * opt, const char ** error)
{
switch(opt->value.x_int)
{
case 0:
case 90:
case 180:
case 270:
return true;
}
*error = "Rotation angle must be one of 0, 90, 180 or 270";
return false;
}
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