bool
TextAsset::load()
{
    // Set up a temporary Cairo surface/context for text measurement
    cairo_surface_t* probeSurface = cairo_image_surface_create(CAIRO_FORMAT_ARGB32, 1, 1);

    if (cairo_surface_status(probeSurface) != CAIRO_STATUS_SUCCESS) {
        fprintf(stderr, "Could not create Cairo surface\n");
        _error = true;
        return false;
    }

    cairo_t* probeContext = cairo_create(probeSurface);
    if (cairo_status(probeContext) != CAIRO_STATUS_SUCCESS) {
        fprintf(stderr, "Could not create Cairo context\n");
        _error = true;
        return false;
    }

    // Text rectangle drawn within border
    const int idealWidth = _maxSize.width - _marginLeft - _marginRight;

    const Size textRegion(idealWidth, _maxSize.height - _marginTop - _marginBottom);
    const float fontSize = primaryFontSize(probeContext, textRegion);

    const std::string fontDesc = _fontName + " " + boost::lexical_cast<std::string>(fontSize);
    PangoFontDescription* fontDescription = pango_font_description_from_string(fontDesc.c_str());

    const std::string req_desc_str(pango_font_description_to_string(fontDescription));
    PangoFontMap* fontMap = pango_cairo_font_map_new_for_font_type(CAIRO_FONT_TYPE_FT);
    PangoContext* pango_context = pango_font_map_create_context(fontMap);

    // TODO: Does this need to be freed or does the context take it with it?
    PangoFont* pangoFont = pango_font_map_load_font(fontMap, pango_context, fontDescription);
    PangoFontDescription* reverseDescription = pango_font_describe(pangoFont);
    const std::string match_desc_str(pango_font_description_to_string(reverseDescription));
    pango_font_description_free(reverseDescription);
    g_object_unref(pango_context);

    if (req_desc_str.find(match_desc_str) == std::string::npos) {
        fprintf(stderr, "Warning: Unable to correctly match font \"%s\", using "
                "\"%s\" instead.\n", req_desc_str.c_str(), match_desc_str.c_str());
    }

    float shadowXOffset = 0;
    float shadowYOffset = 0;
    if (_dropShadow) {
        shadowXOffset = _dropShadowOffset.x() * CLIENT_TO_SERVER_SCALE * fontSize;
        shadowYOffset = _dropShadowOffset.y() * CLIENT_TO_SERVER_SCALE * fontSize;
    }

    Rect tight;
    const Size textSize = computeSizeOfText(probeContext, _textContent, idealWidth, fontDescription, &tight);
    const Size imageSize = imageSizeForTextSize(tight.size, shadowXOffset, shadowYOffset);

    // Tear down scratch contexts
    cairo_destroy(probeContext);
    cairo_surface_destroy(probeSurface);

    const int width = imageSize.width;
    const int height = imageSize.height;

    // Configure the actual Cairo drawing surface/context now that we know the final resolution
    cairo_surface_t* cairoSurface = cairo_image_surface_create(CAIRO_FORMAT_ARGB32, width, height);
    if (cairo_surface_status(cairoSurface) != CAIRO_STATUS_SUCCESS) {
        fprintf(stderr, "Could not create Cairo surface\n");
        _error = true;
        return false;
    }

    cairo_t* cairoContext = cairo_create(cairoSurface);

    // Flip the context like in the iOS version.
    // This fixes flipped filters associated with text assets.
    cairo_translate(cairoContext, 0.0, height);
    cairo_scale(cairoContext, 1.0, -1.0);

    if (cairo_status(cairoContext) != CAIRO_STATUS_SUCCESS) {
        fprintf(stderr, "Could not create Cairo context\n");
        _error = true;
        return false;
    }

    // Fill the box with the background color
    cairo_save(cairoContext);
    cairo_set_operator(cairoContext, CAIRO_OPERATOR_SOURCE);

    const mf::Color& bgColor(_style->getBackgroundColor());
    cairo_set_source_rgba(cairoContext, bgColor.red, bgColor.green, bgColor.blue, bgColor.alpha);

    if (_shape == 0) {
        if (_cornerWidth > 0 && _cornerHeight > 0) {
            // TODO: Support independent corner width and height
            drawRoundedRect(cairoContext, 0, 0, imageSize.width, imageSize.height, _cornerWidth);
        } else {
            cairo_paint(cairoContext);
            if (_strokeThickness > 0.0f) {
                drawStrokedRect(cairoContext, 0, 0, imageSize.width, imageSize.height, _strokeThickness);
            }
        }
    } else if (_shape == 1) {
        strokeFillBezier(cairoContext, 0, 0, imageSize.width, imageSize.height, _strokeThickness);
    }

    cairo_restore(cairoContext);

    const Rect textRect = textRectForTextSize(textSize, imageSize, tight);

    if (_dropShadow) {
        const Rect shadowRect(textRect.x + shadowXOffset,
                              textRect.y + shadowYOffset,
                              textRect.size.width,
                              textRect.size.height);
        cairo_set_source_rgba(cairoContext,
                              _dropShadowColor.red,
                              _dropShadowColor.green,
                              _dropShadowColor.blue,
                              _dropShadowColor.alpha);

        drawText(cairoContext, _textContent, shadowRect, fontDescription, false);
    }

    cairo_set_source_rgba(cairoContext, _textColor.red, _textColor.green, _textColor.blue, _textColor.alpha);

    if (_textColor.alpha > 0.0) {
        drawText(cairoContext, _textContent, textRect, fontDescription, true);
    }

    // DEBUG: Dump rendered text to an image
    // cairo_surface_write_to_png(cairoSurface, "text.png");

    // Transfer Cairo surface to OpenGL texture
    GLubyte* imageData = static_cast<GLubyte *>(cairo_image_surface_get_data(cairoSurface));

    glGenTextures(1, &_texture.textureID);
    glBindTexture(GL_TEXTURE_2D, _texture.textureID);

    _texture.width = width;
    _texture.height = height;
    _texture.s = 1.0;
    _texture.t = 1.0;
    _texture.aspect = static_cast<GLfloat>(_texture.width) / _texture.height;
    _texture.flipImage = true;

    glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
    glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);
    glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
    glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);

#ifdef GL_BGRA
    // Allocate and transfer data into texture (allow OpenGL swizzling)
    glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA, width, height, 0, GL_BGRA, GL_UNSIGNED_INT_8_8_8_8_REV, imageData);
#else
    // Cairo uses a BGRA layout, OpenGL ES 2.0 does not support GL_BGRA as a
    // source format so manually perform swizzling.
    for (size_t i = 0; i < width * height * BYTES_PER_PIXEL; i += BYTES_PER_PIXEL) {
        std::swap(imageData[i], imageData[i + 2]);
    }

    // Allocate and transfer data into texture
    glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA, width, height, 0, GL_RGBA, GL_UNSIGNED_BYTE, imageData);
#endif

    // Clean up
    pango_font_description_free(fontDescription);
    cairo_destroy(cairoContext);
    cairo_surface_destroy(cairoSurface);
    g_object_unref(pangoFont);

    _loading = false;
    _loaded = !_loading && !_error;

    return true;
}
Beispiel #2
0
void po::drawStrokedRect(poRect rect) {
	drawStrokedRect(rect.x, rect.y, rect.width, rect.height);
}
Beispiel #3
0
void WorldUIView::drawBorder(){
	color(Color(0, 0, 0));
	lineWidth(5);
	drawStrokedRect(Rectf(rect.x, rect.y, rect.xEnd, rect.yEnd));
}