double
WheelEvent::DeltaZ()
{
if (!mAppUnitsPerDevPixel) {
return mEvent->AsWheelEvent()->mDeltaZ;
}
return mEvent->AsWheelEvent()->mDeltaZ *
mAppUnitsPerDevPixel / AppUnitsPerCSSPixel();
}
TEST_F(APZCSnappingTester, Bug1265510)
{
const char* layerTreeSyntax = "c(t)";
nsIntRegion layerVisibleRegion[] = {
nsIntRegion(IntRect(0, 0, 100, 100)),
nsIntRegion(IntRect(0, 100, 100, 100))
};
root = CreateLayerTree(layerTreeSyntax, layerVisibleRegion, nullptr, lm, layers);
SetScrollableFrameMetrics(root, FrameMetrics::START_SCROLL_ID, CSSRect(0, 0, 100, 200));
SetScrollableFrameMetrics(layers[1], FrameMetrics::START_SCROLL_ID + 1, CSSRect(0, 0, 100, 200));
SetScrollHandoff(layers[1], root);
ScrollSnapInfo snap;
snap.mScrollSnapTypeY = NS_STYLE_SCROLL_SNAP_TYPE_MANDATORY;
snap.mScrollSnapIntervalY = Some(100 * AppUnitsPerCSSPixel());
ScrollMetadata metadata = root->GetScrollMetadata(0);
metadata.SetSnapInfo(ScrollSnapInfo(snap));
root->SetScrollMetadata(metadata);
UniquePtr<ScopedLayerTreeRegistration> registration = MakeUnique<ScopedLayerTreeRegistration>(manager, 0, root, mcc);
manager->UpdateHitTestingTree(nullptr, root, false, 0, 0);
TestAsyncPanZoomController* outer = ApzcOf(layers[0]);
TestAsyncPanZoomController* inner = ApzcOf(layers[1]);
// Position the mouse near the bottom of the outer frame and scroll by 60px.
// (6 lines of 10px each). APZC will actually scroll to y=100 because of the
// mandatory snap coordinate there.
TimeStamp now = mcc->Time();
SmoothWheel(manager, ScreenIntPoint(50, 80), ScreenPoint(0, 6), now);
// Advance in 5ms increments until we've scrolled by 70px. At this point, the
// closest snap point is y=100, and the inner frame should be under the mouse
// cursor.
while (outer->GetCurrentAsyncScrollOffset(AsyncPanZoomController::AsyncMode::NORMAL).y < 70) {
mcc->AdvanceByMillis(5);
outer->AdvanceAnimations(mcc->Time());
}
// Now do another wheel in a new transaction. This should start scrolling the
// inner frame; we verify that it does by checking the inner scroll position.
TimeStamp newTransactionTime = now + TimeDuration::FromMilliseconds(gfxPrefs::MouseWheelTransactionTimeoutMs() + 100);
SmoothWheel(manager, ScreenIntPoint(50, 80), ScreenPoint(0, 6), newTransactionTime);
inner->AdvanceAnimationsUntilEnd();
EXPECT_LT(0.0f, inner->GetCurrentAsyncScrollOffset(AsyncPanZoomController::AsyncMode::NORMAL).y);
// However, the outer frame should also continue to the snap point, otherwise
// it is demonstrating incorrect behaviour by violating the mandatory snapping.
outer->AdvanceAnimationsUntilEnd();
EXPECT_EQ(100.0f, outer->GetCurrentAsyncScrollOffset(AsyncPanZoomController::AsyncMode::NORMAL).y);
}
nsresult
nsThebesDeviceContext::SetDPI()
{
PRInt32 dpi = -1;
PRBool dotsArePixels = PR_TRUE;
// The number of device pixels per CSS pixel. A value <= 0 means choose
// automatically based on the DPI. A positive value is used as-is. This effectively
// controls the size of a CSS "px".
float prefDevPixelsPerCSSPixel = -1.0;
nsCOMPtr<nsIPrefBranch> prefs = do_GetService(NS_PREFSERVICE_CONTRACTID);
if (prefs) {
nsXPIDLCString prefString;
nsresult rv = prefs->GetCharPref("layout.css.devPixelsPerPx", getter_Copies(prefString));
if (NS_SUCCEEDED(rv) && !prefString.IsEmpty()) {
prefDevPixelsPerCSSPixel = static_cast<float>(atof(prefString));
}
}
// PostScript, PDF and Mac (when printing) all use 72 dpi
// Use a printing DC to determine the other dpi values
if (mPrintingSurface) {
switch (mPrintingSurface->GetType()) {
case gfxASurface::SurfaceTypePDF:
case gfxASurface::SurfaceTypePS:
case gfxASurface::SurfaceTypeQuartz:
dpi = 72;
break;
#ifdef XP_WIN
case gfxASurface::SurfaceTypeWin32:
case gfxASurface::SurfaceTypeWin32Printing: {
PRInt32 OSVal = GetDeviceCaps(GetPrintHDC(), LOGPIXELSY);
dpi = 144;
mPrintingScale = float(OSVal) / dpi;
break;
}
#endif
#ifdef XP_OS2
case gfxASurface::SurfaceTypeOS2:
LONG lDPI;
if (DevQueryCaps(GetPrintHDC(), CAPS_VERTICAL_FONT_RES, 1, &lDPI))
dpi = lDPI;
break;
#endif
default:
NS_NOTREACHED("Unexpected printing surface type");
break;
}
dotsArePixels = PR_FALSE;
} else {
nsresult rv;
// A value of -1 means use the minimum of 96 and the system DPI.
// A value of 0 means use the system DPI. A positive value is used as the DPI.
// This sets the physical size of a device pixel and thus controls the
// interpretation of physical units such as "pt".
PRInt32 prefDPI = -1;
if (prefs) {
rv = prefs->GetIntPref("layout.css.dpi", &prefDPI);
if (NS_FAILED(rv)) {
prefDPI = -1;
}
}
dpi = gfxPlatform::GetDPI();
#ifdef MOZ_ENABLE_GTK2
if (prefDPI < 0) // Clamp the minimum dpi to 96dpi
dpi = PR_MAX(dpi, 96);
#endif
if (prefDPI > 0 && !mPrintingSurface)
dpi = prefDPI;
}
NS_ASSERTION(dpi != -1, "no dpi set");
if (dotsArePixels) {
if (prefDevPixelsPerCSSPixel <= 0) {
// Round down to multiple of 96, which is the number of dev pixels
// per CSS pixel. Then, divide that into AppUnitsPerCSSPixel()
// to get the number of app units per dev pixel. The PR_MAXes are
// to make sure we don't end up dividing by zero.
PRUint32 roundedDPIScaleFactor = dpi/96;
mAppUnitsPerDevNotScaledPixel =
PR_MAX(1, AppUnitsPerCSSPixel() / PR_MAX(1, roundedDPIScaleFactor));
} else {
mAppUnitsPerDevNotScaledPixel =
PR_MAX(1, static_cast<PRInt32>(AppUnitsPerCSSPixel() /
prefDevPixelsPerCSSPixel));
}
} else {
/* set mAppUnitsPerDevPixel so we're using exactly 72 dpi, even
* though that means we have a non-integer number of device "pixels"
* per CSS pixel
*/
mAppUnitsPerDevNotScaledPixel = (AppUnitsPerCSSPixel() * 96) / dpi;
}
mAppUnitsPerInch = NSIntPixelsToAppUnits(dpi, mAppUnitsPerDevNotScaledPixel);
UpdateScaledAppUnits();
return NS_OK;
}
nsresult
nsThebesDeviceContext::SetDPI()
{
float dpi = -1.0f;
// PostScript, PDF and Mac (when printing) all use 72 dpi
// Use a printing DC to determine the other dpi values
if (mPrintingSurface) {
switch (mPrintingSurface->GetType()) {
case gfxASurface::SurfaceTypePDF:
case gfxASurface::SurfaceTypePS:
case gfxASurface::SurfaceTypeQuartz:
dpi = 72.0f;
break;
#ifdef XP_WIN
case gfxASurface::SurfaceTypeWin32:
case gfxASurface::SurfaceTypeWin32Printing: {
PRInt32 OSVal = GetDeviceCaps(GetPrintHDC(), LOGPIXELSY);
dpi = 144.0f;
mPrintingScale = float(OSVal) / dpi;
break;
}
#endif
#ifdef XP_OS2
case gfxASurface::SurfaceTypeOS2:
LONG lDPI;
if (DevQueryCaps(GetPrintHDC(), CAPS_VERTICAL_FONT_RES, 1, &lDPI))
dpi = lDPI;
break;
#endif
default:
NS_NOTREACHED("Unexpected printing surface type");
break;
}
mAppUnitsPerDevNotScaledPixel =
NS_lround((AppUnitsPerCSSPixel() * 96) / dpi);
} else {
nsCOMPtr<nsIPrefBranch> prefs = do_GetService(NS_PREFSERVICE_CONTRACTID);
// A value of -1 means use the maximum of 96 and the system DPI.
// A value of 0 means use the system DPI. A positive value is used as the DPI.
// This sets the physical size of a device pixel and thus controls the
// interpretation of physical units.
PRInt32 prefDPI = -1;
if (prefs) {
nsresult rv = prefs->GetIntPref("layout.css.dpi", &prefDPI);
if (NS_FAILED(rv)) {
prefDPI = -1;
}
}
if (prefDPI > 0) {
dpi = prefDPI;
} else if (mWidget) {
dpi = mWidget->GetDPI();
if (prefDPI < 0) {
dpi = PR_MAX(96.0f, dpi);
}
} else {
dpi = 96.0f;
}
// The number of device pixels per CSS pixel. A value <= 0 means choose
// automatically based on the DPI. A positive value is used as-is. This effectively
// controls the size of a CSS "px".
float devPixelsPerCSSPixel = -1.0;
if (prefs) {
nsXPIDLCString prefString;
nsresult rv = prefs->GetCharPref("layout.css.devPixelsPerPx", getter_Copies(prefString));
if (NS_SUCCEEDED(rv) && !prefString.IsEmpty()) {
devPixelsPerCSSPixel = static_cast<float>(atof(prefString));
}
}
if (devPixelsPerCSSPixel <= 0) {
if (mWidget) {
devPixelsPerCSSPixel = mWidget->GetDefaultScale();
} else {
devPixelsPerCSSPixel = 1.0;
}
}
mAppUnitsPerDevNotScaledPixel =
PR_MAX(1, NS_lround(AppUnitsPerCSSPixel() / devPixelsPerCSSPixel));
}
NS_ASSERTION(dpi != -1.0, "no dpi set");
mAppUnitsPerPhysicalInch = NS_lround(dpi * mAppUnitsPerDevNotScaledPixel);
UpdateScaledAppUnits();
return NS_OK;
}