ref: a8d0595bcd1da3e2faad92e378d8366b5a93ae5e
dir: /external/glfw/src/monitor.c/
//========================================================================
// GLFW 3.3 - www.glfw.org
//------------------------------------------------------------------------
// Copyright (c) 2002-2006 Marcus Geelnard
// Copyright (c) 2006-2019 Camilla Löwy <elmindreda@glfw.org>
//
// This software is provided 'as-is', without any express or implied
// warranty. In no event will the authors be held liable for any damages
// arising from the use of this software.
//
// Permission is granted to anyone to use this software for any purpose,
// including commercial applications, and to alter it and redistribute it
// freely, subject to the following restrictions:
//
// 1. The origin of this software must not be misrepresented; you must not
// claim that you wrote the original software. If you use this software
// in a product, an acknowledgment in the product documentation would
// be appreciated but is not required.
//
// 2. Altered source versions must be plainly marked as such, and must not
// be misrepresented as being the original software.
//
// 3. This notice may not be removed or altered from any source
// distribution.
//
//========================================================================
// Please use C89 style variable declarations in this file because VS 2010
//========================================================================
#include "internal.h"
#include <assert.h>
#include <math.h>
#include <float.h>
#include <string.h>
#include <stdlib.h>
#include <limits.h>
// Lexically compare video modes, used by qsort
//
static int compareVideoModes(const void* fp, const void* sp)
{
const GLFWvidmode* fm = fp;
const GLFWvidmode* sm = sp;
const int fbpp = fm->redBits + fm->greenBits + fm->blueBits;
const int sbpp = sm->redBits + sm->greenBits + sm->blueBits;
const int farea = fm->width * fm->height;
const int sarea = sm->width * sm->height;
// First sort on color bits per pixel
if (fbpp != sbpp)
return fbpp - sbpp;
// Then sort on screen area
if (farea != sarea)
return farea - sarea;
// Then sort on width
if (fm->width != sm->width)
return fm->width - sm->width;
// Lastly sort on refresh rate
return fm->refreshRate - sm->refreshRate;
}
// Retrieves the available modes for the specified monitor
//
static GLFWbool refreshVideoModes(_GLFWmonitor* monitor)
{
int modeCount;
GLFWvidmode* modes;
if (monitor->modes)
return GLFW_TRUE;
modes = _glfwPlatformGetVideoModes(monitor, &modeCount);
if (!modes)
return GLFW_FALSE;
qsort(modes, modeCount, sizeof(GLFWvidmode), compareVideoModes);
free(monitor->modes);
monitor->modes = modes;
monitor->modeCount = modeCount;
return GLFW_TRUE;
}
//////////////////////////////////////////////////////////////////////////
////// GLFW event API //////
//////////////////////////////////////////////////////////////////////////
// Notifies shared code of a monitor connection or disconnection
//
void _glfwInputMonitor(_GLFWmonitor* monitor, int action, int placement)
{
if (action == GLFW_CONNECTED)
{
_glfw.monitorCount++;
_glfw.monitors =
realloc(_glfw.monitors, sizeof(_GLFWmonitor*) * _glfw.monitorCount);
if (placement == _GLFW_INSERT_FIRST)
{
memmove(_glfw.monitors + 1,
_glfw.monitors,
((size_t) _glfw.monitorCount - 1) * sizeof(_GLFWmonitor*));
_glfw.monitors[0] = monitor;
}
else
_glfw.monitors[_glfw.monitorCount - 1] = monitor;
}
else if (action == GLFW_DISCONNECTED)
{
int i;
_GLFWwindow* window;
for (window = _glfw.windowListHead; window; window = window->next)
{
if (window->monitor == monitor)
{
int width, height, xoff, yoff;
_glfwPlatformGetWindowSize(window, &width, &height);
_glfwPlatformSetWindowMonitor(window, NULL, 0, 0, width, height, 0);
_glfwPlatformGetWindowFrameSize(window, &xoff, &yoff, NULL, NULL);
_glfwPlatformSetWindowPos(window, xoff, yoff);
}
}
for (i = 0; i < _glfw.monitorCount; i++)
{
if (_glfw.monitors[i] == monitor)
{
_glfw.monitorCount--;
memmove(_glfw.monitors + i,
_glfw.monitors + i + 1,
((size_t) _glfw.monitorCount - i) * sizeof(_GLFWmonitor*));
break;
}
}
}
if (_glfw.callbacks.monitor)
_glfw.callbacks.monitor((GLFWmonitor*) monitor, action);
if (action == GLFW_DISCONNECTED)
_glfwFreeMonitor(monitor);
}
// Notifies shared code that a full screen window has acquired or released
// a monitor
//
void _glfwInputMonitorWindow(_GLFWmonitor* monitor, _GLFWwindow* window)
{
monitor->window = window;
}
//////////////////////////////////////////////////////////////////////////
////// GLFW internal API //////
//////////////////////////////////////////////////////////////////////////
// Allocates and returns a monitor object with the specified name and dimensions
//
_GLFWmonitor* _glfwAllocMonitor(const char* name, int widthMM, int heightMM)
{
_GLFWmonitor* monitor = calloc(1, sizeof(_GLFWmonitor));
monitor->widthMM = widthMM;
monitor->heightMM = heightMM;
if (name)
monitor->name = _glfw_strdup(name);
return monitor;
}
// Frees a monitor object and any data associated with it
//
void _glfwFreeMonitor(_GLFWmonitor* monitor)
{
if (monitor == NULL)
return;
_glfwPlatformFreeMonitor(monitor);
_glfwFreeGammaArrays(&monitor->originalRamp);
_glfwFreeGammaArrays(&monitor->currentRamp);
free(monitor->modes);
free(monitor->name);
free(monitor);
}
// Allocates red, green and blue value arrays of the specified size
//
void _glfwAllocGammaArrays(GLFWgammaramp* ramp, unsigned int size)
{
ramp->red = calloc(size, sizeof(unsigned short));
ramp->green = calloc(size, sizeof(unsigned short));
ramp->blue = calloc(size, sizeof(unsigned short));
ramp->size = size;
}
// Frees the red, green and blue value arrays and clears the struct
//
void _glfwFreeGammaArrays(GLFWgammaramp* ramp)
{
free(ramp->red);
free(ramp->green);
free(ramp->blue);
memset(ramp, 0, sizeof(GLFWgammaramp));
}
// Chooses the video mode most closely matching the desired one
//
const GLFWvidmode* _glfwChooseVideoMode(_GLFWmonitor* monitor,
const GLFWvidmode* desired)
{
int i;
unsigned int sizeDiff, leastSizeDiff = UINT_MAX;
unsigned int rateDiff, leastRateDiff = UINT_MAX;
unsigned int colorDiff, leastColorDiff = UINT_MAX;
const GLFWvidmode* current;
const GLFWvidmode* closest = NULL;
if (!refreshVideoModes(monitor))
return NULL;
for (i = 0; i < monitor->modeCount; i++)
{
current = monitor->modes + i;
colorDiff = 0;
if (desired->redBits != GLFW_DONT_CARE)
colorDiff += abs(current->redBits - desired->redBits);
if (desired->greenBits != GLFW_DONT_CARE)
colorDiff += abs(current->greenBits - desired->greenBits);
if (desired->blueBits != GLFW_DONT_CARE)
colorDiff += abs(current->blueBits - desired->blueBits);
sizeDiff = abs((current->width - desired->width) *
(current->width - desired->width) +
(current->height - desired->height) *
(current->height - desired->height));
if (desired->refreshRate != GLFW_DONT_CARE)
rateDiff = abs(current->refreshRate - desired->refreshRate);
else
rateDiff = UINT_MAX - current->refreshRate;
if ((colorDiff < leastColorDiff) ||
(colorDiff == leastColorDiff && sizeDiff < leastSizeDiff) ||
(colorDiff == leastColorDiff && sizeDiff == leastSizeDiff && rateDiff < leastRateDiff))
{
closest = current;
leastSizeDiff = sizeDiff;
leastRateDiff = rateDiff;
leastColorDiff = colorDiff;
}
}
return closest;
}
// Performs lexical comparison between two @ref GLFWvidmode structures
//
int _glfwCompareVideoModes(const GLFWvidmode* fm, const GLFWvidmode* sm)
{
return compareVideoModes(fm, sm);
}
// Splits a color depth into red, green and blue bit depths
//
void _glfwSplitBPP(int bpp, int* red, int* green, int* blue)
{
int delta;
// We assume that by 32 the user really meant 24
if (bpp == 32)
bpp = 24;
// Convert "bits per pixel" to red, green & blue sizes
*red = *green = *blue = bpp / 3;
delta = bpp - (*red * 3);
if (delta >= 1)
*green = *green + 1;
if (delta == 2)
*red = *red + 1;
}
//////////////////////////////////////////////////////////////////////////
////// GLFW public API //////
//////////////////////////////////////////////////////////////////////////
GLFWAPI GLFWmonitor** glfwGetMonitors(int* count)
{
assert(count != NULL);
*count = 0;
_GLFW_REQUIRE_INIT_OR_RETURN(NULL);
*count = _glfw.monitorCount;
return (GLFWmonitor**) _glfw.monitors;
}
GLFWAPI GLFWmonitor* glfwGetPrimaryMonitor(void)
{
_GLFW_REQUIRE_INIT_OR_RETURN(NULL);
if (!_glfw.monitorCount)
return NULL;
return (GLFWmonitor*) _glfw.monitors[0];
}
GLFWAPI void glfwGetMonitorPos(GLFWmonitor* handle, int* xpos, int* ypos)
{
_GLFWmonitor* monitor = (_GLFWmonitor*) handle;
assert(monitor != NULL);
if (xpos)
*xpos = 0;
if (ypos)
*ypos = 0;
_GLFW_REQUIRE_INIT();
_glfwPlatformGetMonitorPos(monitor, xpos, ypos);
}
GLFWAPI void glfwGetMonitorWorkarea(GLFWmonitor* handle,
int* xpos, int* ypos,
int* width, int* height)
{
_GLFWmonitor* monitor = (_GLFWmonitor*) handle;
assert(monitor != NULL);
if (xpos)
*xpos = 0;
if (ypos)
*ypos = 0;
if (width)
*width = 0;
if (height)
*height = 0;
_GLFW_REQUIRE_INIT();
_glfwPlatformGetMonitorWorkarea(monitor, xpos, ypos, width, height);
}
GLFWAPI void glfwGetMonitorPhysicalSize(GLFWmonitor* handle, int* widthMM, int* heightMM)
{
_GLFWmonitor* monitor = (_GLFWmonitor*) handle;
assert(monitor != NULL);
if (widthMM)
*widthMM = 0;
if (heightMM)
*heightMM = 0;
_GLFW_REQUIRE_INIT();
if (widthMM)
*widthMM = monitor->widthMM;
if (heightMM)
*heightMM = monitor->heightMM;
}
GLFWAPI void glfwGetMonitorContentScale(GLFWmonitor* handle,
float* xscale, float* yscale)
{
_GLFWmonitor* monitor = (_GLFWmonitor*) handle;
assert(monitor != NULL);
if (xscale)
*xscale = 0.f;
if (yscale)
*yscale = 0.f;
_GLFW_REQUIRE_INIT();
_glfwPlatformGetMonitorContentScale(monitor, xscale, yscale);
}
GLFWAPI const char* glfwGetMonitorName(GLFWmonitor* handle)
{
_GLFWmonitor* monitor = (_GLFWmonitor*) handle;
assert(monitor != NULL);
_GLFW_REQUIRE_INIT_OR_RETURN(NULL);
return monitor->name;
}
GLFWAPI void glfwSetMonitorUserPointer(GLFWmonitor* handle, void* pointer)
{
_GLFWmonitor* monitor = (_GLFWmonitor*) handle;
assert(monitor != NULL);
_GLFW_REQUIRE_INIT();
monitor->userPointer = pointer;
}
GLFWAPI void* glfwGetMonitorUserPointer(GLFWmonitor* handle)
{
_GLFWmonitor* monitor = (_GLFWmonitor*) handle;
assert(monitor != NULL);
_GLFW_REQUIRE_INIT_OR_RETURN(NULL);
return monitor->userPointer;
}
GLFWAPI GLFWmonitorfun glfwSetMonitorCallback(GLFWmonitorfun cbfun)
{
_GLFW_REQUIRE_INIT_OR_RETURN(NULL);
_GLFW_SWAP_POINTERS(_glfw.callbacks.monitor, cbfun);
return cbfun;
}
GLFWAPI const GLFWvidmode* glfwGetVideoModes(GLFWmonitor* handle, int* count)
{
_GLFWmonitor* monitor = (_GLFWmonitor*) handle;
assert(monitor != NULL);
assert(count != NULL);
*count = 0;
_GLFW_REQUIRE_INIT_OR_RETURN(NULL);
if (!refreshVideoModes(monitor))
return NULL;
*count = monitor->modeCount;
return monitor->modes;
}
GLFWAPI const GLFWvidmode* glfwGetVideoMode(GLFWmonitor* handle)
{
_GLFWmonitor* monitor = (_GLFWmonitor*) handle;
assert(monitor != NULL);
_GLFW_REQUIRE_INIT_OR_RETURN(NULL);
_glfwPlatformGetVideoMode(monitor, &monitor->currentMode);
return &monitor->currentMode;
}
GLFWAPI void glfwSetGamma(GLFWmonitor* handle, float gamma)
{
unsigned int i;
unsigned short* values;
GLFWgammaramp ramp;
const GLFWgammaramp* original;
assert(handle != NULL);
assert(gamma > 0.f);
assert(gamma <= FLT_MAX);
_GLFW_REQUIRE_INIT();
if (gamma != gamma || gamma <= 0.f || gamma > FLT_MAX)
{
_glfwInputError(GLFW_INVALID_VALUE, "Invalid gamma value %f", gamma);
return;
}
original = glfwGetGammaRamp(handle);
if (!original)
return;
values = calloc(original->size, sizeof(unsigned short));
for (i = 0; i < original->size; i++)
{
float value;
// Calculate intensity
value = i / (float) (original->size - 1);
// Apply gamma curve
value = powf(value, 1.f / gamma) * 65535.f + 0.5f;
// Clamp to value range
value = _glfw_fminf(value, 65535.f);
values[i] = (unsigned short) value;
}
ramp.red = values;
ramp.green = values;
ramp.blue = values;
ramp.size = original->size;
glfwSetGammaRamp(handle, &ramp);
free(values);
}
GLFWAPI const GLFWgammaramp* glfwGetGammaRamp(GLFWmonitor* handle)
{
_GLFWmonitor* monitor = (_GLFWmonitor*) handle;
assert(monitor != NULL);
_GLFW_REQUIRE_INIT_OR_RETURN(NULL);
_glfwFreeGammaArrays(&monitor->currentRamp);
if (!_glfwPlatformGetGammaRamp(monitor, &monitor->currentRamp))
return NULL;
return &monitor->currentRamp;
}
GLFWAPI void glfwSetGammaRamp(GLFWmonitor* handle, const GLFWgammaramp* ramp)
{
_GLFWmonitor* monitor = (_GLFWmonitor*) handle;
assert(monitor != NULL);
assert(ramp != NULL);
assert(ramp->size > 0);
assert(ramp->red != NULL);
assert(ramp->green != NULL);
assert(ramp->blue != NULL);
if (ramp->size <= 0)
{
_glfwInputError(GLFW_INVALID_VALUE,
"Invalid gamma ramp size %i",
ramp->size);
return;
}
_GLFW_REQUIRE_INIT();
if (!monitor->originalRamp.size)
{
if (!_glfwPlatformGetGammaRamp(monitor, &monitor->originalRamp))
return;
}
_glfwPlatformSetGammaRamp(monitor, ramp);
}