axmol/core/platform/emscripten/Device-emscripten.cpp

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#include "platform/PlatformConfig.h"
#if AX_TARGET_PLATFORM == AX_PLATFORM_EMSCRIPTEN

#include "platform/Device.h"
#include "platform/FileUtils.h"

#include <emscripten/emscripten.h>
#include <emscripten/html5.h>

NS_AX_BEGIN

int Device::getDPI()
{
    return 160;
}

void Device::setAccelerometerEnabled(bool isEnabled)
{
    // TODO: https://emscripten.org/docs/api_reference/html5.h.html?
}

void Device::setAccelerometerInterval(float interval)
{
    // TODO: https://emscripten.org/docs/api_reference/html5.h.html?
}

Data Device::getTextureDataForText(std::string_view text, const FontDefinition& textDefinition, TextAlign align, int &width, int &height, bool& hasPremultipliedAlpha)
{
    char color[8];
    sprintf(color, "#%02x%02x%02x", textDefinition._fontFillColor.r, textDefinition._fontFillColor.g, textDefinition._fontFillColor.b);
    unsigned char* ptr = (unsigned char*)EM_ASM_INT({
        var lines = UTF8ToString($0).split("\n");
        var linesWidth = [];
        var fontName = UTF8ToString($1);
        var fontSize = $2;
        var lineHeight = $2 * 1.2; // Nothing accurate
        var color = UTF8ToString($3);
        var dimWidth = $4;
        var dimHeight = $5;
        var align = $6;
        
        var canvas = Module.cocosSharedCanvas = Module.cocosSharedCanvas || document.createElement("canvas");
        var context = canvas.getContext("2d");
        context.font = fontSize + "px " + fontName;
        
        var canvasWidth = dimWidth;
        var canvasHeight = dimHeight;
        for (var i = 0; i < lines.length; i++) {
            var lineWidth = context.measureText(lines[i]).width;
            linesWidth[i] = lineWidth;
            if (lineWidth > canvasWidth && dimWidth <= 0) {
                canvasWidth = lineWidth;
            }             
        };

        if (dimHeight <= 0) {
            canvasHeight = lineHeight * lines.length;
        }

        canvas.width = canvasWidth;
        canvas.height = canvasHeight;
        
        context.clearRect(0, 0, canvasWidth, canvasHeight);
        context.font = fontSize + "px " + fontName;
        context.fillStyle = color;
        context.textBaseline = "top"; 

        //Vertical top
        var offsetY = 0;
        if ((align & 0xf0) == 0x30) {
            //Vertical center
            offsetY = (canvasHeight - lineHeight * lines.length) / 2;
        } else if ((align & 0xf0) == 0x20) {
            //Vertical bottom
            offsetY = canvasHeight - lineHeight * lines.length;
        }

        for (var i = 0; i < lines.length; i++) {
            //Horizonal left
            var offsetX = 0;
            if ((align & 0x0f) == 0x03) {
                //Horizonal center
                offsetX = (canvasWidth - linesWidth[i]) / 2;
            } else if ((align & 0x0f) == 0x02) {
                //Horizonal right
                offsetX = canvasWidth - linesWidth[i];
            }
            context.fillText(lines[i], offsetX, offsetY + lineHeight * i);
        }
        
        var data = context.getImageData(0, 0, canvasWidth, canvasHeight).data;
        var ptr = _malloc(data.byteLength); // Cocos Data object free it
        var buffer= new Uint8Array(Module.HEAPU8.buffer, ptr, data.byteLength);
        buffer.set(data);
        return ptr;
    }, text.data(), textDefinition._fontName.c_str(), textDefinition._fontSize, color, textDefinition._dimensions.width, textDefinition._dimensions.height, align);
    
    width = EM_ASM_INT({
        return Module.cocosSharedCanvas.width;
    });
    height = EM_ASM_INT({
        return Module.cocosSharedCanvas.height;
    });
    hasPremultipliedAlpha = true;
    
    Data ret;
    ret.fastSet(ptr, width * height * 4);
    return ret;
}

void Device::setKeepScreenOn(bool value)
{
    // Impossible in browser
}

void Device::vibrate(float duration)
{
    emscripten_vibrate(duration * 1000);
}

void Device::prepareImpactFeedbackGenerator(ImpactFeedbackStyle style) {}

void Device::impactOccurred(ImpactFeedbackStyle style) {}

void Device::prepareNotificationFeedbackGenerator() {}

void Device::notificationOccurred(NotificationFeedbackType type) {}

void Device::prepareSelectionFeedbackGenerator() {}

void Device::selectionChanged() {}

NS_AX_END

#endif // AX_TARGET_PLATFORM == AX_PLATFORM_EMSCRIPTEN