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Add content scale queries

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This adds glfwGetWindowContentScale and glfwGetMonitorContentScale for
querying the recommended drawing scale factor for DPI-aware rendering.

Parts of this patch are based on code by @ferreiradaselva.

Fixes #235.
Fixes #439.
Fixes #677.
Fixes #845.
Fixes #898.
This commit is contained in:
Camilla Löwy
2017-08-29 19:19:00 +02:00
parent 1be81a1540
commit 16bf872117
26 changed files with 387 additions and 28 deletions
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src/win32_monitor.c
+43 -7
View File
@@ -60,6 +60,7 @@ static _GLFWmonitor* createMonitor(DISPLAY_DEVICEW* adapter,
DISPLAY_DEVICEW* display)
{
_GLFWmonitor* monitor;
int widthMM, heightMM;
char* name;
HDC dc;
DEVMODEW dm;
@@ -72,13 +73,26 @@ static _GLFWmonitor* createMonitor(DISPLAY_DEVICEW* adapter,
if (!name)
return NULL;
ZeroMemory(&dm, sizeof(dm));
dm.dmSize = sizeof(dm);
EnumDisplaySettingsW(adapter->DeviceName, ENUM_CURRENT_SETTINGS, &dm);
dc = CreateDCW(L"DISPLAY", adapter->DeviceName, NULL, NULL);
monitor = _glfwAllocMonitor(name,
GetDeviceCaps(dc, HORZSIZE),
GetDeviceCaps(dc, VERTSIZE));
if (IsWindows8Point1OrGreater())
{
widthMM = GetDeviceCaps(dc, HORZSIZE);
heightMM = GetDeviceCaps(dc, VERTSIZE);
}
else
{
widthMM = (int) (dm.dmPelsWidth * 25.4f / GetDeviceCaps(dc, LOGPIXELSX));
heightMM = (int) (dm.dmPelsHeight * 25.4f / GetDeviceCaps(dc, LOGPIXELSY));
}
DeleteDC(dc);
monitor = _glfwAllocMonitor(name, widthMM, heightMM);
free(name);
if (adapter->StateFlags & DISPLAY_DEVICE_MODESPRUNED)
@@ -101,10 +115,6 @@ static _GLFWmonitor* createMonitor(DISPLAY_DEVICEW* adapter,
NULL, NULL);
}
ZeroMemory(&dm, sizeof(dm));
dm.dmSize = sizeof(dm);
EnumDisplaySettingsW(adapter->DeviceName, ENUM_CURRENT_SETTINGS, &dm);
rect.left = dm.dmPosition.x;
rect.top = dm.dmPosition.y;
rect.right = dm.dmPosition.x + dm.dmPelsWidth;
@@ -302,6 +312,26 @@ void _glfwRestoreVideoModeWin32(_GLFWmonitor* monitor)
}
}
void _glfwGetMonitorContentScaleWin32(HMONITOR handle, float* xscale, float* yscale)
{
UINT xdpi, ydpi;
if (IsWindows8Point1OrGreater())
GetDpiForMonitor(handle, MDT_EFFECTIVE_DPI, &xdpi, &ydpi);
else
{
const HDC dc = GetDC(NULL);
xdpi = GetDeviceCaps(dc, LOGPIXELSX);
ydpi = GetDeviceCaps(dc, LOGPIXELSY);
ReleaseDC(NULL, dc);
}
if (xscale)
*xscale = xdpi / 96.f;
if (yscale)
*yscale = ydpi / 96.f;
}
//////////////////////////////////////////////////////////////////////////
////// GLFW platform API //////
@@ -324,6 +354,12 @@ void _glfwPlatformGetMonitorPos(_GLFWmonitor* monitor, int* xpos, int* ypos)
*ypos = dm.dmPosition.y;
}
void _glfwPlatformGetMonitorContentScale(_GLFWmonitor* monitor,
float* xscale, float* yscale)
{
_glfwGetMonitorContentScaleWin32(monitor->win32.handle, xscale, yscale);
}
GLFWvidmode* _glfwPlatformGetVideoModes(_GLFWmonitor* monitor, int* count)
{
int modeIndex = 0, size = 0;