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Bug 716575 (3/4) - Move viewport pixel ratio calculations into the platform [r=dbaron,jwir3,mfinkle,roc]

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This commit is contained in:
Matt Brubeck 2012-08-22 13:18:10 -07:00
parent 24c6d5e17e
commit 8fb68b79fb
2 changed files with 68 additions and 19 deletions
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5
content/base/public/nsContentUtils.h
View File

@ -1549,6 +1549,11 @@ public:
uint32_t aDisplayWidth,
uint32_t aDisplayHeight);
/**
* The device-pixel-to-CSS-px ratio used to adjust meta viewport values.
*/
static double GetDevicePixelsPerMetaViewportPixel(nsIWidget* aWidget);
// Call EnterMicroTask when you're entering JS execution.
// Usually the best way to do this is to use nsAutoMicroTask.
static void EnterMicroTask() { ++sMicroTaskLevel; }

82
content/base/src/nsContentUtils.cpp
View File

@ -12,6 +12,8 @@
#include "jsdbgapi.h"
#include "jsfriendapi.h"
#include <math.h>
#include "Layers.h"
#include "nsJSUtils.h"
#include "nsCOMPtr.h"
@ -5174,12 +5176,44 @@ nsContentUtils::GetViewportInfo(nsIDocument *aDocument,
autoSize = true;
}
uint32_t width = widthStr.ToInteger(&errorCode);
if (NS_FAILED(errorCode)) {
if (autoSize) {
width = aDisplayWidth;
} else {
width = Preferences::GetInt("browser.viewport.desktopWidth", 0);
// Now convert the scale into device pixels per CSS pixel.
nsIWidget *widget = WidgetForDocument(aDocument);
double pixelRatio = widget ? GetDevicePixelsPerMetaViewportPixel(widget) : 1.0;
scaleFloat *= pixelRatio;
scaleMinFloat *= pixelRatio;
scaleMaxFloat *= pixelRatio;
uint32_t width, height;
if (autoSize) {
// aDisplayWidth and aDisplayHeight are in device pixels; convert them to
// CSS pixels for the viewport size.
width = aDisplayWidth / pixelRatio;
height = aDisplayHeight / pixelRatio;
} else {
nsresult widthErrorCode, heightErrorCode;
width = widthStr.ToInteger(&widthErrorCode);
height = heightStr.ToInteger(&heightErrorCode);
// If width or height has not been set to a valid number by this point,
// fall back to a default value.
bool validWidth = (!widthStr.IsEmpty() && NS_SUCCEEDED(widthErrorCode) && width > 0);
bool validHeight = (!heightStr.IsEmpty() && NS_SUCCEEDED(heightErrorCode) && height > 0);
if (!validWidth) {
if (validHeight && aDisplayWidth > 0 && aDisplayHeight > 0) {
width = uint32_t((height * aDisplayWidth) / aDisplayHeight);
} else {
width = Preferences::GetInt("browser.viewport.desktopWidth",
kViewportDefaultScreenWidth);
}
}
if (!validHeight) {
if (aDisplayWidth > 0 && aDisplayHeight > 0) {
height = uint32_t((width * aDisplayHeight) / aDisplayWidth);
} else {
height = width;
}
}
}
@ -5189,19 +5223,7 @@ nsContentUtils::GetViewportInfo(nsIDocument *aDocument,
// Also recalculate the default zoom, if it wasn't specified in the metadata,
// and the width is specified.
if (scaleStr.IsEmpty() && !widthStr.IsEmpty()) {
scaleFloat = NS_MAX(scaleFloat, (float)(aDisplayWidth/width));
}
uint32_t height = heightStr.ToInteger(&errorCode);
if (NS_FAILED(errorCode)) {
height = width * ((float)aDisplayHeight / aDisplayWidth);
}
// If height was provided by the user, but width wasn't, then we should
// calculate the width.
if (widthStr.IsEmpty() && !heightStr.IsEmpty()) {
width = (uint32_t) ((height * aDisplayWidth) / aDisplayHeight);
scaleFloat = NS_MAX(scaleFloat, float(aDisplayWidth) / float(width));
}
height = NS_MIN(height, kViewportMaxHeight);
@ -5237,6 +5259,28 @@ nsContentUtils::GetViewportInfo(nsIDocument *aDocument,
return ret;
}
/* static */
double
nsContentUtils::GetDevicePixelsPerMetaViewportPixel(nsIWidget* aWidget)
{
int32_t prefValue = Preferences::GetInt("browser.viewport.scaleRatio", 0);
if (prefValue > 0) {
return double(prefValue) / 100.0;
}
float dpi = aWidget->GetDPI();
if (dpi < 200.0) {
// Includes desktop displays, LDPI and MDPI Android devices
return 1.0;
}
if (dpi < 300.0) {
// Includes Nokia N900, and HDPI Android devices
return 1.5;
}
// For very high-density displays like the iPhone 4, use an integer ratio.
return floor(dpi / 150.0);
}
/* static */
nsresult
nsContentUtils::ProcessViewportInfo(nsIDocument *aDocument,