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// Copyright (c) 2012-2014 The CEF Python authors. All rights reserved.
// License: New BSD License.
// Website: http://code.google.com/p/cefpython/
// Windows only
#pragma comment(lib, "Gdi32.lib")
#include <math.h>
#include "dpi_aware.h"
#include "include/cef_runnable.h"
#include "LOG_DEBUG.h"
const int DEFAULT_DPIX = 96;
bool IsProcessDpiAware() {
typedef BOOL(WINAPI *IsProcessDPIAwarePtr)(VOID);
IsProcessDPIAwarePtr is_process_dpi_aware_func =
reinterpret_cast<IsProcessDPIAwarePtr>(
GetProcAddress(GetModuleHandleA("user32.dll"),
"IsProcessDPIAware"));
BOOL is_aware = FALSE;
if (is_process_dpi_aware_func) {
is_aware = is_process_dpi_aware_func();
if (is_aware == TRUE) {
return true;
}
}
// GetProcessDpiAwareness is available only on Win8. So it
// should be called only as a back-up plan after IsProcessDPIAware
// was called. Also if IsProcessDPIAware returned false,
// then GetProcessDpiAwareness is called as well.
if (GetProcessDpiAwareness() != PROCESS_DPI_UNAWARE) {
return true;
}
return false;
}
PROCESS_DPI_AWARENESS GetProcessDpiAwareness() {
// Win8.1 supports monitor-specific DPI scaling, so it is
// recommended to use GetProcessDPIAwareness instead of the
// deprecated IsProcessDPIAware.
typedef HRESULT(WINAPI *GetProcessDpiAwarenessPtr)
(HANDLE,PROCESS_DPI_AWARENESS*);
GetProcessDpiAwarenessPtr get_process_dpi_awareness_func =
reinterpret_cast<GetProcessDpiAwarenessPtr>(
GetProcAddress(GetModuleHandleA("user32.dll"),
"GetProcessDpiAwarenessInternal"));
if (get_process_dpi_awareness_func) {
HANDLE hProcess = OpenProcess(PROCESS_ALL_ACCESS, false,
GetCurrentProcessId());
PROCESS_DPI_AWARENESS result;
HRESULT hr = get_process_dpi_awareness_func(hProcess, &result);
if (SUCCEEDED(hr)) {
return result;
}
// Possible failures include E_INVALIDARG or E_ACCESSDENIED.
LOG_DEBUG << "Browser: GetProcessDpiAwareness failed with HR=" << hr;
}
return PROCESS_DPI_UNAWARE;
}
void SetProcessDpiAware() {
// Win8.1 supports monitor-specific DPI scaling, so it is
// recommended to use SetProcessDPIAwareness instead of the
// deprecated SetProcessDPIAware. SetProcessDpiAwareness is
// only available on Win8. So as a back-up plan SetProcessDPIAware
// is called.
// If DPI aware manifest was embedded in executable, or
// "Disable display scaling on high DPI settings" was checked
// on the executable properties (Compatibility tab), then
// DPI awareness is already set.
/*
What if GetProcessDpiAwareness returned
PROCESS_PER_MONITOR_DPI_AWARE? The code below sets awareness
to PROCESS_SYSTEM_DPI_AWARE, so it should be called either way.
--OFF:
if (IsProcessDpiAware()) {
return;
}
*/
typedef BOOL(WINAPI *SetProcessDpiAwarenessPtr)(PROCESS_DPI_AWARENESS);
SetProcessDpiAwarenessPtr set_process_dpi_awareness_func =
reinterpret_cast<SetProcessDpiAwarenessPtr>(
GetProcAddress(GetModuleHandleA("user32.dll"),
"SetProcessDpiAwarenessInternal"));
if (set_process_dpi_awareness_func) {
LOG_DEBUG << "Browser: SetProcessDpiAware: "
<< "calling user32.dll SetProcessDpiAwareness";
HRESULT hr = set_process_dpi_awareness_func(PROCESS_SYSTEM_DPI_AWARE);
if (SUCCEEDED(hr)) {
LOG_DEBUG << "Browser: SetBrowserDpiAware: "
"SetProcessDpiAwareness succeeded";
return;
} else if (hr == E_ACCESSDENIED) {
LOG_DEBUG << "Browser: SetBrowserDpiAware: "
"SetProcessDpiAwareness FAILED: "
"The DPI awareness is already set, either by calling "
"this API previously or through the application (.exe) "
"manifest.";
// Do not return here, let's try to call SetProcessDPIAware.
} else {
LOG_DEBUG << "Browser: SetBrowserDpiAware: "
"SetProcessDpiAwareness FAILED";
// Do not return here, let's try to call SetProcessDPIAware.
}
}
// SetProcessDpiAwareness not found in user32.dll or the call failed.
typedef BOOL(WINAPI *SetProcessDPIAwarePtr)(VOID);
SetProcessDPIAwarePtr set_process_dpi_aware_func =
reinterpret_cast<SetProcessDPIAwarePtr>(
GetProcAddress(GetModuleHandleA("user32.dll"),
"SetProcessDPIAware"));
if (set_process_dpi_aware_func) {
// If cefpython.Initialize() wasn't yet called, then
// this log message won't be written, as g_debug is
// is set during CEF initialization.
LOG_DEBUG << "Browser: SetProcessDpiAware: "
<< "calling user32.dll SetProcessDPIAware";
set_process_dpi_aware_func();
}
}
void GetSystemDpi(int* dpix, int* dpiy) {
// Win7 DPI (Control Panel > Appearance and Personalization > Display):
// text size Larger 150% => dpix/dpiy 144
// text size Medium 125% => dpix/dpiy 120
// text size Smaller 100% => dpix/dpiy 96
//
// DPI settings should not be cached. When SetProcessDpiAware
// is not yet called, then OS returns 96 DPI, even though it
// is set to 144 DPI. After DPI Awareness is enabled for the
// running process it will return the correct 144 DPI.
HDC hdc = GetDC(HWND_DESKTOP);
*dpix = GetDeviceCaps(hdc, LOGPIXELSX);
*dpiy = GetDeviceCaps(hdc, LOGPIXELSY);
ReleaseDC(HWND_DESKTOP, hdc);
}
void GetDpiAwareWindowSize(int* width, int* height) {
int dpix = 0;
int dpiy = 0;
GetSystemDpi(&dpix, &dpiy);
double newZoomLevel = 0.0;
// 1. Using only "dpix" value to calculate zoom level. All
// modern displays have equal horizontal and vertical resolution.
// 2. Calculation for DPI < 96 is not yet supported (newZoomLevel<0.0).
newZoomLevel = (dpix - DEFAULT_DPIX) / 24;
if (newZoomLevel > 0.0) {
*width = *width + (int)ceil(newZoomLevel * 0.25 * (*width));
*height = *height + (int)ceil(newZoomLevel * 0.25 * (*height));
LOG_DEBUG << "Browser: GetDpiAwareWindowSize: "
<< "enlarged by " << ceil(newZoomLevel * 0.25 * 100) << "% "
<< "new size = " << *width << "/" << *height;
}
}
void SetBrowserDpiSettings(CefRefPtr<CefBrowser> cefBrowser,
CefString autoZooming) {
// Setting zoom level immediately after browser was created
// won't work. We need to wait a moment before we can set it.
REQUIRE_UI_THREAD();
double oldZoomLevel = cefBrowser->GetHost()->GetZoomLevel();
double newZoomLevel = 0.0;
int dpix = 0;
int dpiy = 0;
GetSystemDpi(&dpix, &dpiy);
if (autoZooming.ToString() == "system_dpi") {
// Using only "dpix" value to calculate zoom level. All
// modern displays have equal horizontal/vertical resolution.
// Examples:
// dpix=96 zoom=0.0
// dpix=120 zoom=1.0
// dpix=144 zoom=2.0
// dpix=72 zoom=-1.0
newZoomLevel = (dpix - DEFAULT_DPIX) / 24;
} else {
// When atof() fails converting string to double, then
// 0.0 is returned.
newZoomLevel = atof(autoZooming.ToString().c_str());
}
if (oldZoomLevel != newZoomLevel) {
cefBrowser->GetHost()->SetZoomLevel(newZoomLevel);
if (cefBrowser->GetHost()->GetZoomLevel() != oldZoomLevel) {
// OK succes.
LOG_DEBUG << "Browser: SetBrowserDpiSettings: "
<< "DPI=" << dpix << " "
<< "zoom=" << cefBrowser->GetHost()->GetZoomLevel();
}
} else {
// This code block running can also be a result of executing
// SetZoomLevel(), as GetZoomLevel() didn't return the new
// value that was set. Documentation says that if SetZoomLevel
// is called on the UI thread, then GetZoomLevel should
// immediately return the same value that was set. Unfortunately
// this seems not to be true.
static bool already_logged = false;
if (!already_logged) {
already_logged = true;
// OK success.
LOG_DEBUG << "Browser: SetBrowserDpiSettings: "
<< "DPI=" << dpix << " "
<< "zoom=" << cefBrowser->GetHost()->GetZoomLevel();
}
}
// We need to check zooming constantly, during loading of pages.
// If we set zooming to 2.0 for localhost/ and then it navigates
// to google.com, then the zomming is back at 0.0 and needs to
// be set again.
CefPostDelayedTask(
TID_UI,
NewCefRunnableFunction(&SetBrowserDpiSettings, cefBrowser,
autoZooming),
50);
}