kitty/glfw/null_monitor.c

//========================================================================
// GLFW 3.4 - www.glfw.org
//------------------------------------------------------------------------
// Copyright (c) 2016 Google Inc.
// Copyright (c) 2016-2019 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.
//
//========================================================================
// It is fine to use C99 in this file because it will not be built with VS
//========================================================================

#include "internal.h"

#include <stdlib.h>
#include <string.h>
#include <math.h>

// The sole (fake) video mode of our (sole) fake monitor
//
static GLFWvidmode
getVideoMode(void) {
    GLFWvidmode mode;
    mode.width = 1920;
    mode.height = 1080;
    mode.redBits = 8;
    mode.greenBits = 8;
    mode.blueBits = 8;
    mode.refreshRate = 60;
    return mode;
}

//////////////////////////////////////////////////////////////////////////
//////                       GLFW internal API                      //////
//////////////////////////////////////////////////////////////////////////

void
_glfwPollMonitorsNull(void) {
    const float dpi = 141.f;
    const GLFWvidmode mode = getVideoMode();
    _GLFWmonitor *monitor = _glfwAllocMonitor("Null SuperNoop 0", (int)(mode.width * 25.4f / dpi), (int)(mode.height * 25.4f / dpi));
    _glfwInputMonitor(monitor, GLFW_CONNECTED, _GLFW_INSERT_FIRST);
}

//////////////////////////////////////////////////////////////////////////
//////                       GLFW platform API                      //////
//////////////////////////////////////////////////////////////////////////

void
_glfwPlatformFreeMonitor(_GLFWmonitor *monitor) {
    _glfwFreeGammaArrays(&monitor->null.ramp);
}

void
_glfwPlatformGetMonitorPos(_GLFWmonitor *monitor UNUSED, int *xpos, int *ypos) {
    if (xpos) *xpos = 0;
    if (ypos) *ypos = 0;
}

void
_glfwPlatformGetMonitorContentScale(_GLFWmonitor *monitor UNUSED, float *xscale, float *yscale) {
    if (xscale) *xscale = 1.f;
    if (yscale) *yscale = 1.f;
}

void
_glfwPlatformGetMonitorWorkarea(_GLFWmonitor *monitor UNUSED, int *xpos, int *ypos, int *width, int *height) {
    const GLFWvidmode mode = getVideoMode();

    if (xpos) *xpos = 0;
    if (ypos) *ypos = 10;
    if (width) *width = mode.width;
    if (height) *height = mode.height - 10;
}

GLFWvidmode *
_glfwPlatformGetVideoModes(_GLFWmonitor *monitor UNUSED, int *found) {
    GLFWvidmode *mode = calloc(1, sizeof(GLFWvidmode));
    *mode = getVideoMode();
    *found = 1;
    return mode;
}

void
_glfwPlatformGetVideoMode(_GLFWmonitor *monitor UNUSED, GLFWvidmode *mode) {
    *mode = getVideoMode();
}

bool
_glfwPlatformGetGammaRamp(_GLFWmonitor *monitor, GLFWgammaramp *ramp) {
    if (!monitor->null.ramp.size) {
        _glfwAllocGammaArrays(&monitor->null.ramp, 256);

        for (unsigned int i = 0; i < monitor->null.ramp.size; i++) {
            const float gamma = 2.2f;
            float value;
            value = i / (float)(monitor->null.ramp.size - 1);
            value = powf(value, 1.f / gamma) * 65535.f + 0.5f;
            value = _glfw_fminf(value, 65535.f);

            monitor->null.ramp.red[i] = (unsigned short)value;
            monitor->null.ramp.green[i] = (unsigned short)value;
            monitor->null.ramp.blue[i] = (unsigned short)value;
        }
    }

    _glfwAllocGammaArrays(ramp, monitor->null.ramp.size);
    memcpy(ramp->red, monitor->null.ramp.red, sizeof(short) * ramp->size);
    memcpy(ramp->green, monitor->null.ramp.green, sizeof(short) * ramp->size);
    memcpy(ramp->blue, monitor->null.ramp.blue, sizeof(short) * ramp->size);
    return true;
}

void
_glfwPlatformSetGammaRamp(_GLFWmonitor *monitor, const GLFWgammaramp *ramp) {
    if (monitor->null.ramp.size != ramp->size) {
        _glfwInputError(GLFW_PLATFORM_ERROR, "Null: Gamma ramp size must match current ramp size");
        return;
    }

    memcpy(monitor->null.ramp.red, ramp->red, sizeof(short) * ramp->size);
    memcpy(monitor->null.ramp.green, ramp->green, sizeof(short) * ramp->size);
    memcpy(monitor->null.ramp.blue, ramp->blue, sizeof(short) * ramp->size);
}