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

/****************************************************************************
Copyright (c) 2010-2012 cocos2d-x.org
Copyright (c) 2013-2016 Chukong Technologies Inc.
Copyright (c) 2017-2018 Xiamen Yaji Software Co., Ltd.
Copyright (c) 2019-present Axmol Engine contributors (see AUTHORS.md).

https://axmolengine.github.io/

Permission is hereby granted, free of charge, to any person obtaining a copy
of this software and associated documentation files (the "Software"), to deal
in the Software without restriction, including without limitation the rights
to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
copies of the Software, and to permit persons to whom the Software is
furnished to do so, subject to the following conditions:

The above copyright notice and this permission notice shall be included in
all copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
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****************************************************************************/

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

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

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

NS_AX_BEGIN

int Device::getDPI()
{
    return static_cast<int>(160 * Device::getPixelRatio());
}

float Device::getPixelRatio() 
{
    return EM_ASM_DOUBLE(return window.devicePixelRatio);
}

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.axmolSharedCanvas = Module.axmolSharedCanvas || 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;
        }

        canvasWidth = Math.ceil(canvasWidth);
        canvasHeight = Math.ceil(canvasHeight);

        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.axmolSharedCanvas.width;
    });
    height = EM_ASM_INT({
        return Module.axmolSharedCanvas.height;
    });
    hasPremultipliedAlpha = false;
    
    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_WASM