cocos_lib/cocos/platform/linux/modules/CanvasRenderingContext2DDelegate.cpp

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 Copyright (c) 2021-2023 Xiamen Yaji Software Co., Ltd.

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#include "platform/linux/modules/CanvasRenderingContext2DDelegate.h"
#include "platform/linux/LinuxPlatform.h"
#include "platform/linux/modules/SystemWindow.h"

namespace {
#define RGB(r, g, b)     (int)((int)r | (((int)g) << 8) | (((int)b) << 16))
#define RGBA(r, g, b, a) (int)((int)r | (((int)g) << 8) | (((int)b) << 16) | (((int)a) << 24))
} // namespace

namespace cc {
//static const char gdefaultFontName[] = "-*-helvetica-medium-o-*-*-24-*-*-*-*-*-iso8859-*";
//static const char gdefaultFontName[] = "lucidasanstypewriter-bold-24";
static const char gdefaultFontName[] = "lucidasans-24";

CanvasRenderingContext2DDelegate::CanvasRenderingContext2DDelegate() {
    SystemWindow *window = BasePlatform::getPlatform()->getInterface<SystemWindow>();
    CC_ASSERT_NOT_NULL(window);
    _dis = reinterpret_cast<Display *>(window->getDisplay());
    _win = reinterpret_cast<Drawable>(window->getWindowHandle());
}

CanvasRenderingContext2DDelegate::~CanvasRenderingContext2DDelegate() {
    XFreePixmap(_dis, _pixmap);
    XFreeGC(_dis, _gc);
}

void CanvasRenderingContext2DDelegate::recreateBuffer(float w, float h) {
    _bufferWidth = w;
    _bufferHeight = h;
    if (_bufferWidth < 1.0F || _bufferHeight < 1.0F) {
        return;
    }
    auto textureSize = static_cast<int>(_bufferWidth * _bufferHeight * 4);
    auto *data = static_cast<int8_t *>(malloc(sizeof(int8_t) * textureSize));
    memset(data, 0x00, textureSize);
    _imageData.fastSet((uint8_t *)data, textureSize);

    if (_pixmap) {
        XFreePixmap(_dis, _pixmap);
        _pixmap = 0;
    }
    if (!_win) {
        return;
    }
    //Screen *scr = DefaultScreenOfDisplay(_dis);
    _pixmap = XCreatePixmap(_dis, _win, w, h, 32);
    _gc = XCreateGC(_dis, _pixmap, 0, 0);
}

void CanvasRenderingContext2DDelegate::beginPath() {
    // called: set_lineWidth() -> beginPath() -> moveTo() -> lineTo() -> stroke(), when draw line
    XSetLineAttributes(_dis, _gc, static_cast<int>(_lineWidth), LineSolid, _lineCap, _lineJoin);
    XSetForeground(_dis, _gc, RGB(255, 255, 255));
}

void CanvasRenderingContext2DDelegate::closePath() {
}

void CanvasRenderingContext2DDelegate::moveTo(float x, float y) {
    //MoveToEx(_DC, static_cast<int>(x), static_cast<int>(-(y - _bufferHeight - _fontSize)), nullptr);
    _x = x;
    _y = y;
}

void CanvasRenderingContext2DDelegate::lineTo(float x, float y) {
    //LineTo(_DC,  static_cast<int>(x),  static_cast<int>(-(y - _bufferHeight - _fontSize)));
    XDrawLine(_dis, _pixmap, _gc, _x, _y, x, y);
}

void CanvasRenderingContext2DDelegate::stroke() {
}

void CanvasRenderingContext2DDelegate::saveContext() {
}

void CanvasRenderingContext2DDelegate::restoreContext() {
}

void CanvasRenderingContext2DDelegate::clearRect(float x, float y, float w, float h) {
    if (_bufferWidth < 1.0F || _bufferHeight < 1.0F) {
        return;
    }

    if (_imageData.isNull()) {
        return;
    }

    recreateBuffer(w, h);
}

void CanvasRenderingContext2DDelegate::fillRect(float x, float y, float w, float h) {
    if (_bufferWidth < 1.0F || _bufferHeight < 1.0F) {
        return;
    }

    XSetForeground(_dis, _gc, _fillStyle);
    XFillRectangle(_dis, _pixmap, _gc, x, y, w, h);
}

void CanvasRenderingContext2DDelegate::fillText(const ccstd::string &text, float x, float y, float /*maxWidth*/) {
    if (text.empty() || _bufferWidth < 1.0F || _bufferHeight < 1.0F) {
        return;
    }

    Point offsetPoint = convertDrawPoint(Point{x, y}, text);
    XSetForeground(_dis, _gc, 0xff000000 | _fillStyle);
    XSetFont(_dis, _gc, _font->fid);
    XDrawString(_dis, _pixmap, _gc, offsetPoint[0], offsetPoint[1], text.c_str(), (int)(text.length()));
    XImage *image = XGetImage(_dis, _pixmap, 0, 0, _bufferWidth, _bufferHeight, AllPlanes, ZPixmap);
    int width = image->width;
    int height = image->height;
    unsigned char *data = _imageData.getBytes();
    for (int y = 0; y < height; ++y) {
        for (int x = 0; x < width; x++) {
            *(((int *)data + (y * width) + x)) = static_cast<int>(XGetPixel(image, x, y));
        }
    }
}

void CanvasRenderingContext2DDelegate::strokeText(const ccstd::string &text, float /*x*/, float /*y*/, float /*maxWidth*/) const {
    if (text.empty() || _bufferWidth < 1.0F || _bufferHeight < 1.0F) {
        return;
    }
}

CanvasRenderingContext2DDelegate::Size CanvasRenderingContext2DDelegate::measureText(const ccstd::string &text) {
    if (text.empty())
        return ccstd::array<float, 2>{0.0f, 0.0f};
    int font_ascent = 0;
    int font_descent = 0;
    int direction = 0;
    XCharStruct overall;
    XQueryTextExtents(_dis, _font->fid, text.c_str(), text.length(), &direction, &font_ascent, &font_descent, &overall);
    return ccstd::array<float, 2>{static_cast<float>(overall.width),
                                  static_cast<float>(overall.ascent + overall.descent)};
}

void CanvasRenderingContext2DDelegate::updateFont(const ccstd::string &fontName,
                                                  float fontSize,
                                                  bool bold,
                                                  bool italic,
                                                  bool oblique,
                                                  bool /* smallCaps */) {
    do {
        _fontName = fontName;
        _fontSize = static_cast<int>(fontSize);
        /// TODO(bug):Remove default settings
        ccstd::string fontName = "helvetica"; // default
        char serv[1024] = {0};
        ccstd::string slant = "";
        if (italic) {
            slant = "*I";
        } else if (oblique) {
            slant = "*o";
        }
        // *name-bold*Italic(Oblique)*size
        snprintf(serv, sizeof(serv) - 1, "*%s%s%s*--%d*", fontName.c_str(),
                 bold ? "*Bold" : "",
                 slant.c_str(),
                 _fontSize);
        if (_font) {
            XFreeFont(_dis, _font);
            _font = 0;
        }

        _font = XLoadQueryFont(_dis, serv);
        if (!_font) {
            static int fontSizes[] = {8, 10, 12, 14, 18, 24};
            int i = 0;
            int size = sizeof(fontSizes) / sizeof(fontSizes[0]);
            for (i = 0; i < size; ++i) {
                if (_fontSize < fontSizes[i]) {
                    break;
                }
            }
            if (i == 0) {
                _fontSize = fontSizes[0];
            } else if (i > 1 && i < size) {
                _fontSize = fontSizes[i - 1];
            } else {
                _fontSize = fontSizes[size - 1];
            }
            snprintf(serv, sizeof(serv) - 1, "*%s*%d*", "lucidasans", _fontSize);
            _font = XLoadQueryFont(_dis, serv);
            if (!_font) {
                _font = XLoadQueryFont(_dis, serv);
            }
        }
    } while (false);
}

void CanvasRenderingContext2DDelegate::setTextAlign(TextAlign align) {
    _textAlign = align;
}

void CanvasRenderingContext2DDelegate::setTextBaseline(TextBaseline baseline) {
    _textBaseLine = baseline;
}

void CanvasRenderingContext2DDelegate::setFillStyle(uint8_t r, uint8_t g, uint8_t b, uint8_t a) {
    _fillStyle = RGBA(r, g, b, a);
}

void CanvasRenderingContext2DDelegate::setStrokeStyle(uint8_t r, uint8_t g, uint8_t b, uint8_t a) {
    _strokeStyle = RGBA(r, g, b, a);
}

void CanvasRenderingContext2DDelegate::setLineWidth(float lineWidth) {
    _lineWidth = lineWidth;
}

const cc::Data &CanvasRenderingContext2DDelegate::getDataRef() const {
    return _imageData;
}

void CanvasRenderingContext2DDelegate::removeCustomFont() {
    XFreeFont(_dis, None);
}

// x, y offset value
int CanvasRenderingContext2DDelegate::drawText(const ccstd::string &text, int x, int y) {
    XTextItem item{const_cast<char *>(text.c_str()), static_cast<int>(text.length()), 0, None};
    return XDrawText(_dis, _pixmap, _gc, x, y, &item, 1);
}

CanvasRenderingContext2DDelegate::Size CanvasRenderingContext2DDelegate::sizeWithText(const wchar_t *pszText, int nLen) {
    // if (text.empty())
    //     return ccstd::array<float, 2>{0.0f, 0.0f};
    // XFontStruct *fs = XLoadQueryFont(dpy, "cursor");
    // CC_ASSERT(fs);
    // int font_ascent = 0;
    // int font_descent = 0;
    // XCharStruct overall;
    // XQueryTextExtents(_dis, fs -> fid, text.c_str(), text.length(), nullptr, &font_ascent, &font_descent, &overall);
    // return ccstd::array<float, 2>{static_cast<float>(overall.lbearing),
    //                             static_cast<float>(overall.rbearing)};
    return ccstd::array<float, 2>{0.0F, 0.0F};
}

void CanvasRenderingContext2DDelegate::prepareBitmap(int nWidth, int nHeight) {
}

void CanvasRenderingContext2DDelegate::deleteBitmap() {
}

void CanvasRenderingContext2DDelegate::fillTextureData() {
}

ccstd::array<float, 2> CanvasRenderingContext2DDelegate::convertDrawPoint(Point point, const ccstd::string &text) {
    int font_ascent = 0;
    int font_descent = 0;
    int direction = 0;
    XCharStruct overall;
    XQueryTextExtents(_dis, _font->fid, text.c_str(), text.length(), &direction, &font_ascent, &font_descent, &overall);
    int width = overall.width;
    if (_textAlign == TextAlign::CENTER) {
        point[0] -= width / 2.0f;
    } else if (_textAlign == TextAlign::RIGHT) {
        point[0] -= width;
    }

    if (_textBaseLine == TextBaseline::TOP) {
        point[1] += overall.ascent;
    } else if (_textBaseLine == TextBaseline::MIDDLE) {
        point[1] += (overall.descent - overall.ascent) / 2 - overall.descent;
    } else if (_textBaseLine == TextBaseline::BOTTOM) {
        point[1] += -overall.descent;
    } else if (_textBaseLine == TextBaseline::ALPHABETIC) {
        //point[1] -= overall.ascent;
        // X11 The default way of drawing text
    }

    return point;
}

void CanvasRenderingContext2DDelegate::fill() {
}

void CanvasRenderingContext2DDelegate::setLineCap(const ccstd::string &lineCap) {
    _lineCap = LineSolid;
}

void CanvasRenderingContext2DDelegate::setLineJoin(const ccstd::string &lineJoin) {
    _lineJoin = JoinRound;
}

void CanvasRenderingContext2DDelegate::fillImageData(const Data & /* imageData */,
                                                     float /* imageWidth */,
                                                     float /* imageHeight */,
                                                     float /* offsetX */,
                                                     float /* offsetY */) {
    //XCreateImage(display, visual, DefaultDepth(display,DefaultScreen(display)), ZPixmap, 0, image32, width, height, 32, 0);
    //XPutImage(dpy, w, gc, image, 0, 0, 50, 60, 40, 30);
}

void CanvasRenderingContext2DDelegate::strokeText(const ccstd::string & /* text */,
                                                  float /* x */,
                                                  float /* y */,
                                                  float /* maxWidth */) {
}

void CanvasRenderingContext2DDelegate::rect(float /* x */,
                                            float /* y */,
                                            float /* w */,
                                            float /* h */) {
}

} // namespace cc