ToolUtils::VariationSliders Class Reference

#include <ToolUtils.h>

Public Member Functions
	VariationSliders ()
	VariationSliders (SkTypeface *, SkFontArguments::VariationPosition variationPosition={nullptr, 0})
bool	writeControls (SkMetaData *controls)
void	readControls (const SkMetaData &controls, bool *changed=nullptr)
SkSpan< const SkFontArguments::VariationPosition::Coordinate >	getCoordinates ()

Static Public Member Functions
static SkString	tagToString (SkFourByteTag tag)

Detailed Description

Definition at line 320 of file ToolUtils.h.

Constructor & Destructor Documentation

VariationSliders() [1/2]

ToolUtils::VariationSliders::VariationSliders ( )

inline

Definition at line 322 of file ToolUtils.h.

{}

VariationSliders() [2/2]

ToolUtils::VariationSliders::VariationSliders	(	SkTypeface *	typeface,
		SkFontArguments::VariationPosition	variationPosition = {nullptr, 0}
	)

Definition at line 522 of file ToolUtils.cpp.

                                                                                       {
    if (!typeface) {
        return;
    }
 
    int numAxes = typeface->getVariationDesignParameters(nullptr, 0);
    if (numAxes < 0) {
        return;
    }
 
    std::unique_ptr<SkFontParameters::Variation::Axis[]> copiedAxes =
            std::make_unique<SkFontParameters::Variation::Axis[]>(numAxes);
 
    numAxes = typeface->getVariationDesignParameters(copiedAxes.get(), numAxes);
    if (numAxes < 0) {
        return;
    }
 
    auto argVariationPositionOrDefault = [&variationPosition](SkFourByteTag tag,
                                                              SkScalar defaultValue) -> SkScalar {
        for (int i = 0; i < variationPosition.coordinateCount; ++i) {
            if (variationPosition.coordinates[i].axis == tag) {
                return variationPosition.coordinates[i].value;
            }
        }
        return defaultValue;
    };
 
    fAxisSliders.resize(numAxes);
    fCoords = std::make_unique<SkFontArguments::VariationPosition::Coordinate[]>(numAxes);
    for (int i = 0; i < numAxes; ++i) {
        fAxisSliders[i].axis = copiedAxes[i];
        fAxisSliders[i].current =
                argVariationPositionOrDefault(copiedAxes[i].tag, copiedAxes[i].def);
        fAxisSliders[i].name = tagToString(fAxisSliders[i].axis.tag);
        fCoords[i] = { fAxisSliders[i].axis.tag, fAxisSliders[i].current };
    }
}

Member Function Documentation

getCoordinates()

SkSpan< const SkFontArguments::VariationPosition::Coordinate > ToolUtils::VariationSliders::getCoordinates

(

)

Definition at line 600 of file ToolUtils.cpp.

                                                                                          {
    return SkSpan<const SkFontArguments::VariationPosition::Coordinate>{fCoords.get(),
                                                                        fAxisSliders.size()};
}

readControls()

void ToolUtils::VariationSliders::readControls	(	const SkMetaData &	controls,
		bool *	changed = nullptr
	)

Definition at line 585 of file ToolUtils.cpp.

                                                                             {
    for (size_t i = 0; i < fAxisSliders.size(); ++i) {
        SkScalar axisVars[kAxisVarsSize] = {0};
        int resultAxisVarsSize = 0;
        SkASSERT_RELEASE(controls.findScalars(
                tagToString(fAxisSliders[i].axis.tag).c_str(), &resultAxisVarsSize, axisVars));
        SkASSERT_RELEASE(resultAxisVarsSize == kAxisVarsSize);
        if (changed) {
            *changed |= fAxisSliders[i].current != axisVars[0];
        }
        fAxisSliders[i].current = axisVars[0];
        fCoords[i] = { fAxisSliders[i].axis.tag, fAxisSliders[i].current };
    }
}

tagToString()

SkString ToolUtils::VariationSliders::tagToString ( SkFourByteTag  tag )

static

Definition at line 563 of file ToolUtils.cpp.

                                                        {
    char tagAsString[5];
    tagAsString[4] = 0;
    tagAsString[0] = (char)(uint8_t)(tag >> 24);
    tagAsString[1] = (char)(uint8_t)(tag >> 16);
    tagAsString[2] = (char)(uint8_t)(tag >> 8);
    tagAsString[3] = (char)(uint8_t)(tag >> 0);
    return SkString(tagAsString);
}

writeControls()

bool ToolUtils::VariationSliders::writeControls

(

SkMetaData *

controls

)

Definition at line 573 of file ToolUtils.cpp.

                                                         {
    for (size_t i = 0; i < fAxisSliders.size(); ++i) {
        SkScalar axisVars[kAxisVarsSize];
 
        axisVars[0] = fAxisSliders[i].current;
        axisVars[1] = fAxisSliders[i].axis.min;
        axisVars[2] = fAxisSliders[i].axis.max;
        controls->setScalars(fAxisSliders[i].name.c_str(), kAxisVarsSize, axisVars);
    }
    return true;
}

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The documentation for this class was generated from the following files:

• third_party/skia/tools/ToolUtils.h
• third_party/skia/tools/ToolUtils.cpp