static void
locate_pointer_paint (GsdLocatePointerData *data,
                      cairo_t              *cr,
                      gboolean              composite)
{
  GdkRGBA color;
  gdouble progress, circle_progress;
  gint width, height, i;
  GtkStyleContext *context;

  progress = data->progress;

  width = gdk_window_get_width (data->window);
  height = gdk_window_get_height (data->window);
  context = gtk_widget_get_style_context (data->widget);
  gtk_style_context_get_background_color (context, GTK_STATE_FLAG_SELECTED, &color);

  cairo_set_source_rgba (cr, 1., 1., 1., 0.);
  cairo_set_operator (cr, CAIRO_OPERATOR_SOURCE);
  cairo_paint (cr);

  for (i = 0; i <= N_CIRCLES; i++)
    {
      if (progress < 0.)
        break;

      circle_progress = MIN (1., (progress * 2));
      progress -= CIRCLES_PROGRESS_INTERVAL;

      if (circle_progress >= 1.)
        continue;

      if (composite)
        {
          cairo_set_source_rgba (cr,
                                 color.red,
                                 color.green,
                                 color.blue,
                                 1 - circle_progress);
          cairo_arc (cr,
                     width / 2,
                     height / 2,
                     circle_progress * width / 2,
                     0, 2 * G_PI);

          cairo_fill (cr);
        }
      else
        {
          cairo_set_source_rgb (cr, 0., 0., 0.);
          cairo_set_line_width (cr, 3.);
          cairo_arc (cr,
                     width / 2,
                     height / 2,
                     circle_progress * width / 2,
                     0, 2 * G_PI);
          cairo_stroke (cr);

          cairo_set_source_rgb (cr, 1., 1., 1.);
          cairo_set_line_width (cr, 1.);
          cairo_arc (cr,
                     width / 2,
                     height / 2,
                     circle_progress * width / 2,
                     0, 2 * G_PI);
          cairo_stroke (cr);
        }
    }
}

static void
clearlooks_glossy_draw_progressbar_fill (cairo_t *cr,
                                  const ClearlooksColors *colors,
                                  const WidgetParameters *params,
                                  const ProgressBarParameters *progressbar,
                                  int x, int y, int width, int height,
                                  gint offset)
{
	boolean      is_horizontal = progressbar->orientation < 2;
	double       tile_pos = 0;
	double       stroke_width;
	double       radius;
	int          x_step;

	cairo_pattern_t *pattern;
	CairoColor       a;
	CairoColor       b;
	CairoColor       e;
	CairoColor       border;
	CairoColor       shadow;

	radius = MAX (0, params->radius - params->xthickness);

	cairo_save (cr);

	if (!is_horizontal)
		ge_cairo_exchange_axis (cr, &x, &y, &width, &height);

	if ((progressbar->orientation == CL_ORIENTATION_RIGHT_TO_LEFT) || (progressbar->orientation == CL_ORIENTATION_BOTTOM_TO_TOP))
		ge_cairo_mirror (cr, CR_MIRROR_HORIZONTAL, &x, &y, &width, &height);

	/* Clamp the radius so that the _height_ fits ...  */
	radius = MIN (radius, height / 2.0);

	stroke_width = height*2;
	x_step = (((float)stroke_width/10)*offset); /* This looks weird ... */
	
	cairo_translate (cr, x, y);

	cairo_save (cr);
	/* This is kind of nasty ... Clip twice from each side in case the length
	 * of the fill is smaller than twice the radius. */
	ge_cairo_rounded_rectangle (cr, 0, 0, width + radius, height, radius, CR_CORNER_TOPLEFT | CR_CORNER_BOTTOMLEFT);
	cairo_clip (cr);
	ge_cairo_rounded_rectangle (cr, -radius, 0, width + radius, height, radius, CR_CORNER_TOPRIGHT | CR_CORNER_BOTTOMRIGHT);
	cairo_clip (cr);

	/* Draw the background gradient */
	ge_shade_color (&colors->spot[1], 1.16, &a);
	ge_shade_color (&colors->spot[1], 1.08, &b);
	ge_shade_color (&colors->spot[1], 1.08, &e);
	pattern = cairo_pattern_create_linear (0, 0, 0, height);
	cairo_pattern_add_color_stop_rgb (pattern, 0.0, a.r, a.g, a.b);
	cairo_pattern_add_color_stop_rgb (pattern, 0.5, b.r, b.g, b.b);
	cairo_pattern_add_color_stop_rgb (pattern, 0.5, colors->spot[1].r, colors->spot[1].g, colors->spot[1].b);
	cairo_pattern_add_color_stop_rgb (pattern, 1.0, e.r, e.g, e.b);
	cairo_set_source (cr, pattern);
	cairo_paint (cr);
	cairo_pattern_destroy (pattern);

	/* Draw the Strokes */
	while (stroke_width > 0 && tile_pos <= width+x_step)
	{
		cairo_move_to (cr, stroke_width/2-x_step, 0);
		cairo_line_to (cr, stroke_width-x_step,   0);
		cairo_line_to (cr, stroke_width/2-x_step, height);
		cairo_line_to (cr, -x_step, height);
		
		cairo_translate (cr, stroke_width, 0);
		tile_pos += stroke_width;
	}
	
	cairo_set_source_rgba (cr, colors->spot[2].r,
	                           colors->spot[2].g,
	                           colors->spot[2].b,
	                           0.15);
	
	cairo_fill (cr);
	cairo_restore (cr); /* rounded clip region */

	/* inner highlight border
	 * This is again kinda ugly. Draw once from each side, clipping away the other. */
	cairo_set_source_rgba (cr, colors->spot[0].r, colors->spot[0].g, colors->spot[0].b, 0.3);

	/* left side */
	cairo_save (cr);
	cairo_rectangle (cr, 0, 0, width / 2, height);
	cairo_clip (cr);

	if (progressbar->pulsing)
		ge_cairo_rounded_rectangle (cr, 1.5, 0.5, width + radius, height - 1, radius, CR_CORNER_TOPLEFT | CR_CORNER_BOTTOMLEFT);
	else
		ge_cairo_rounded_rectangle (cr, 0.5, 0.5, width + radius, height - 1, radius, CR_CORNER_TOPLEFT | CR_CORNER_BOTTOMLEFT);

	cairo_stroke (cr);
	cairo_restore (cr); /* clip */

	/* right side */
	cairo_save (cr);
	cairo_rectangle (cr, width / 2, 0, (width+1) / 2, height);
//.........这里部分代码省略.........

void Font::drawGlyphs(GraphicsContext* context, const SimpleFontData* font, const GlyphBuffer& glyphBuffer,
                      int from, int numGlyphs, const FloatPoint& point) const
{
    cairo_t* cr = context->platformContext();
    cairo_save(cr);

    cairo_set_scaled_font(cr, font->platformData().scaledFont());

    GlyphBufferGlyph* glyphs = (GlyphBufferGlyph*)glyphBuffer.glyphs(from);

    float offset = 0.0f;
    for (int i = 0; i < numGlyphs; i++) {
        glyphs[i].x = offset;
        glyphs[i].y = 0.0f;
        offset += glyphBuffer.advanceAt(from + i);
    }

    Color fillColor = context->fillColor();

    // Synthetic Oblique
    if(font->platformData().syntheticOblique()) {
        cairo_matrix_t mat = {1, 0, -tanf(SYNTHETIC_OBLIQUE_ANGLE * acosf(0) / 90), 1, point.x(), point.y()};
        cairo_transform(cr, &mat);
    } else {
        cairo_translate(cr, point.x(), point.y());
    }

    // Text shadow, inspired by FontMac
    IntSize shadowSize;
    int shadowBlur = 0;
    Color shadowColor;
    bool hasShadow = context->textDrawingMode() == cTextFill &&
        context->getShadow(shadowSize, shadowBlur, shadowColor);

    // TODO: Blur support
    if (hasShadow) {
        // Disable graphics context shadows (not yet implemented) and paint them manually
        context->clearShadow();
        Color shadowFillColor(shadowColor.red(), shadowColor.green(), shadowColor.blue(), shadowColor.alpha() * fillColor.alpha() / 255);
        cairo_save(cr);

        float red, green, blue, alpha;
        shadowFillColor.getRGBA(red, green, blue, alpha);
        cairo_set_source_rgba(cr, red, green, blue, alpha);

#if ENABLE(FILTERS)
        cairo_text_extents_t extents;
        cairo_scaled_font_glyph_extents(font->platformData().scaledFont(), glyphs, numGlyphs, &extents);

        FloatRect rect(FloatPoint(), FloatSize(extents.width, extents.height));
        IntSize shadowBufferSize;
        FloatRect shadowRect;
        float kernelSize = 0.f;
        GraphicsContext::calculateShadowBufferDimensions(shadowBufferSize, shadowRect, kernelSize, rect, shadowSize, shadowBlur);

        // Draw shadow into a new ImageBuffer
        OwnPtr<ImageBuffer> shadowBuffer = ImageBuffer::create(shadowBufferSize);
        GraphicsContext* shadowContext = shadowBuffer->context();
        cairo_t* shadowCr = shadowContext->platformContext();

        cairo_translate(shadowCr, kernelSize, extents.height + kernelSize);

        cairo_set_scaled_font(shadowCr, font->platformData().scaledFont());
        cairo_show_glyphs(shadowCr, glyphs, numGlyphs);
        if (font->syntheticBoldOffset()) {
            cairo_save(shadowCr);
            cairo_translate(shadowCr, font->syntheticBoldOffset(), 0);
            cairo_show_glyphs(shadowCr, glyphs, numGlyphs);
            cairo_restore(shadowCr);
        }
        cairo_translate(cr, 0.0, -extents.height);
        context->createPlatformShadow(shadowBuffer.release(), shadowColor, shadowRect, kernelSize);
#else
        cairo_translate(cr, shadowSize.width(), shadowSize.height());
        cairo_show_glyphs(cr, glyphs, numGlyphs);
        if (font->syntheticBoldOffset()) {
            cairo_save(cr);
            cairo_translate(cr, font->syntheticBoldOffset(), 0);
            cairo_show_glyphs(cr, glyphs, numGlyphs);
            cairo_restore(cr);
        }
#endif

        cairo_restore(cr);
    }

    if (context->textDrawingMode() & cTextFill) {
        if (context->fillGradient()) {
            cairo_set_source(cr, context->fillGradient()->platformGradient());
            if (context->getAlpha() < 1.0f) {
                cairo_push_group(cr);
                cairo_paint_with_alpha(cr, context->getAlpha());
                cairo_pop_group_to_source(cr);
            }
        } else if (context->fillPattern()) {
            AffineTransform affine;
            cairo_set_source(cr, context->fillPattern()->createPlatformPattern(affine));
            if (context->getAlpha() < 1.0f) {
                cairo_push_group(cr);
                cairo_paint_with_alpha(cr, context->getAlpha());
//.........这里部分代码省略.........

static void
expose_filemanager (dt_view_t *self, cairo_t *cr, int32_t width, int32_t height, int32_t pointerx, int32_t pointery)
{
  dt_library_t *lib = (dt_library_t *)self->data;

  gboolean offset_changed = FALSE;

  /* query new collection count */
  lib->collection_count = dt_collection_get_count (darktable.collection);

  if(darktable.gui->center_tooltip == 1)
    darktable.gui->center_tooltip = 2;

  /* get grid stride */
  const int iir = dt_conf_get_int("plugins/lighttable/images_in_row");

  /* get image over id */
  lib->image_over = DT_VIEW_DESERT;
  int32_t mouse_over_id, mouse_over_group = -1;
  DT_CTL_GET_GLOBAL(mouse_over_id, lib_image_mouse_over_id);

  /* fill background */
  cairo_set_source_rgb (cr, .2, .2, .2);
  cairo_paint(cr);

  if(lib->first_visible_zoomable >= 0)
  {
    lib->offset = lib->first_visible_zoomable;
  }
  lib->first_visible_zoomable = -1;

  /* check if offset has been changed */
  if(lib->track >  2) lib->offset += iir;
  if(lib->track < -2) lib->offset -= iir;
  lib->track = 0;
  if(lib->center) lib->offset = 0;
  lib->center = 0;
  int offset = lib->offset;

  /* if offset differs then flag as changed */
  if (offset != lib->first_visible_filemanager)
    offset_changed = TRUE;

  lib->first_visible_filemanager = offset;
  static int oldpan = 0;
  const int pan = lib->pan;

  const float wd = width/(float)iir;
  const float ht = width/(float)iir;

  int pi = pointerx / (float)wd;
  int pj = pointery / (float)ht;
  if(pointerx < 0 || pointery < 0) pi = pj = -1;
  //const int pidx = grid_to_index(pj, pi, iir, offset);

  const int img_pointerx = iir == 1 ? pointerx : fmodf(pointerx, wd);
  const int img_pointery = iir == 1 ? pointery : fmodf(pointery, ht);

  const int max_rows = 1 + (int)((height)/ht + .5);
  const int max_cols = iir;

  int id;
  int clicked1 = (oldpan == 0 && pan == 1 && lib->button == 1);

  /* get the count of current collection */

  if(lib->collection_count == 0)
  {
    const float fs = 15.0f;
    const float ls = 1.5f*fs;
    const float offy = height*0.2f;
    const float offx = 60;
    const float at = 0.3f;
    cairo_set_font_size(cr, fs);
    cairo_set_source_rgba(cr, .7, .7, .7, 1.0f);
    cairo_select_font_face (cr, "sans-serif", CAIRO_FONT_SLANT_NORMAL, CAIRO_FONT_WEIGHT_NORMAL);
    cairo_move_to(cr, offx, offy);
    cairo_show_text(cr, _("there are no images in this collection"));
    cairo_move_to(cr, offx, offy + 2*ls);
    cairo_show_text(cr, _("if you have not imported any images yet"));
    cairo_move_to(cr, offx, offy + 3*ls);
    cairo_show_text(cr, _("you can do so in the import module"));
    cairo_move_to(cr, offx - 10.0f, offy + 3*ls - ls*.25f);
    cairo_line_to(cr, 0.0f, 10.0f);
    cairo_set_source_rgba(cr, .7, .7, .7, at);
    cairo_stroke(cr);
    cairo_move_to(cr, offx, offy + 5*ls);
    cairo_set_source_rgba(cr, .7, .7, .7, 1.0f);
    cairo_show_text(cr, _("try to relax the filter settings in the top panel"));
    cairo_rel_move_to(cr, 10.0f, -ls*.25f);
    cairo_line_to(cr, width*0.5f, 0.0f);
    cairo_set_source_rgba(cr, .7, .7, .7, at);
    cairo_stroke(cr);
    cairo_move_to(cr, offx, offy + 6*ls);
    cairo_set_source_rgba(cr, .7, .7, .7, 1.0f);
    cairo_show_text(cr, _("or add images in the collection module in the left panel"));
    cairo_move_to(cr, offx - 10.0f, offy + 6*ls - ls*0.25f);
    cairo_rel_line_to(cr, - offx + 10.0f, 0.0f);
    cairo_set_source_rgba(cr, .7, .7, .7, at);
    cairo_stroke(cr);
//.........这里部分代码省略.........

static void
clearlooks_glossy_draw_list_view_header (cairo_t *cr,
                                  const ClearlooksColors          *colors,
                                  const WidgetParameters          *params,
                                  const ListViewHeaderParameters  *header,
                                  int x, int y, int width, int height)
{
/*
	CairoColor *border = !params->prelight? (CairoColor*)&colors->shade[4] : (CairoColor*)&colors->spot[1];
*/
	const CairoColor *border = &colors->shade[4];
	const CairoColor *fill   = &colors->bg[params->state_type];
	CairoColor hilight;
	CairoColor shade1, shade2, shade3;

	cairo_pattern_t *pattern;

 	ge_shade_color (fill, 1.2, &hilight);
	ge_shade_color (fill, 1.08, &shade1);
	ge_shade_color (fill, 1.04, &shade2);
	ge_shade_color (fill, 1.04, &shade3);

	cairo_translate (cr, x, y);
	cairo_set_line_width (cr, 1.0);

	/* Draw the fill */
	pattern = cairo_pattern_create_linear (0, 0, 0, height);
	cairo_pattern_add_color_stop_rgb (pattern, 0.0, shade1.r, shade1.g, shade1.b);
	cairo_pattern_add_color_stop_rgb (pattern, 0.5, shade2.r, shade2.g, shade2.b);
	cairo_pattern_add_color_stop_rgb (pattern, 0.5, fill->r, fill->g, fill->b);
	cairo_pattern_add_color_stop_rgb (pattern, 1.0-1.0/height, shade3.r, shade3.g, shade3.b);
	cairo_pattern_add_color_stop_rgb (pattern, 1.0-1.0/height, border->r, border->g, border->b);
	cairo_pattern_add_color_stop_rgb (pattern, 1.0, border->r, border->g, border->b);

	cairo_set_source (cr, pattern);
	cairo_rectangle (cr, 0, 0, width, height);
	cairo_fill (cr);

	cairo_pattern_destroy (pattern);
	
	/* Draw highlight */
	if (header->order & CL_ORDER_FIRST)
	{
		cairo_move_to (cr, 0.5, height-1);
		cairo_line_to (cr, 0.5, 0.5);
	}
	else
		cairo_move_to (cr, 0.0, 0.5);
	
	cairo_line_to (cr, width, 0.5);
	
	cairo_set_source_rgba (cr, hilight.r, hilight.g, hilight.b, 0.5);
	cairo_stroke (cr);
	
	/* Draw resize grip */
	if ((params->ltr && !(header->order & CL_ORDER_LAST)) ||
	    (!params->ltr && !(header->order & CL_ORDER_FIRST)) || header->resizable)
	{
		SeparatorParameters separator;
		separator.horizontal = FALSE;
		
		if (params->ltr)
			params->style_functions->draw_separator (cr, colors, params, &separator,
			                                         width-1.5, 4.0, 2, height-8.0);
		else
			params->style_functions->draw_separator (cr, colors, params, &separator,
			                                         1.5, 4.0, 2, height-8.0);
	}
}

imageObj* createImageCairo(int width, int height, outputFormatObj *format,colorObj* bg)
{
  imageObj *image = NULL;
  cairo_renderer *r=NULL;
  if (format->imagemode != MS_IMAGEMODE_RGB && format->imagemode!= MS_IMAGEMODE_RGBA) {
    msSetError(MS_MISCERR,
               "Cairo driver only supports RGB or RGBA pixel models.","msImageCreateCairo()");
    return image;
  }
  if (width > 0 && height > 0) {
    image = (imageObj *) calloc(1, sizeof(imageObj));
    r = (cairo_renderer*)calloc(1,sizeof(cairo_renderer));
    if(!strcasecmp(format->driver,"cairo/pdf")) {
      r->outputStream = (bufferObj*)malloc(sizeof(bufferObj));
      msBufferInit(r->outputStream);
      r->surface = cairo_pdf_surface_create_for_stream(
                     _stream_write_fn,
                     r->outputStream,
                     width,height);
    } else if(!strcasecmp(format->driver,"cairo/svg")) {
      r->outputStream = (bufferObj*)malloc(sizeof(bufferObj));
      msBufferInit(r->outputStream);
      r->surface = cairo_svg_surface_create_for_stream(
                     _stream_write_fn,
                     r->outputStream,
                     width,height);
    } else if(!strcasecmp(format->driver,"cairo/winGDI") && format->device) {
#if CAIRO_HAS_WIN32_SURFACE
      r->outputStream = NULL;
      r->surface = cairo_win32_surface_create(format->device);
#else
      msSetError(MS_RENDERERERR, "Cannot create cairo image. Cairo was not compiled with support for the win32 backend.",
                 "msImageCreateCairo()");
#endif
    } else if(!strcasecmp(format->driver,"cairo/winGDIPrint") && format->device) {
#if CAIRO_HAS_WIN32_SURFACE
      r->outputStream = NULL;
      r->surface = cairo_win32_printing_surface_create(format->device);
#else
      msSetError(MS_RENDERERERR, "Cannot create cairo image. Cairo was not compiled with support for the win32 backend.",
                 "msImageCreateCairo()");
#endif
    } else {
      r->outputStream = NULL;
      r->surface = cairo_image_surface_create (CAIRO_FORMAT_ARGB32, width, height);
    }
    r->cr = cairo_create(r->surface);
    if(format->transparent || !bg || !MS_VALID_COLOR(*bg)) {
      r->use_alpha = 1;
      cairo_set_source_rgba (r->cr, 0,0,0,0);
    } else {
      r->use_alpha = 0;
      msCairoSetSourceColor(r->cr,bg);
    }
    cairo_save (r->cr);
    cairo_set_operator (r->cr, CAIRO_OPERATOR_SOURCE);
    cairo_paint (r->cr);
    cairo_restore (r->cr);

    cairo_set_line_cap (r->cr,CAIRO_LINE_CAP_ROUND);
    cairo_set_line_join(r->cr,CAIRO_LINE_JOIN_ROUND);
    image->img.plugin = (void*)r;
  } else {
    msSetError(MS_RENDERERERR, "Cannot create cairo image of size %dx%d.",
               "msImageCreateCairo()", width, height);
  }
  return image;
}

void cairo_context::set_color(double r, double g, double b, double opacity)
{
    // http://lists.cairographics.org/archives/cairo/2008-August/014759.html
    cairo_set_source_rgba(cairo_.get(), r, g, b, opacity);
    check_object_status_and_throw_exception(*this);
}

static void
set_translucent_pattern (cairo_t *cr, int x, int y)
{
    cairo_set_source_rgba (cr, 1, 0, 0, 0.5);
}

//.........这里部分代码省略.........
                          (strtol(strgroupst[3], NULL, 16))};
    char strgroupsk[4][3] = {{keyhlcolor[0], textcolor[1], '\0'},
                             {keyhlcolor[2], textcolor[3], '\0'},
                             {keyhlcolor[4], textcolor[5], '\0'},
                             {keyhlcolor[6], textcolor[7], '\0'}};
    uint32_t keyhl16[4] = {(strtol(strgroupsk[0], NULL, 16)),
                           (strtol(strgroupsk[1], NULL, 16)),
                           (strtol(strgroupsk[2], NULL, 16)),
                           (strtol(strgroupsk[3], NULL, 16))};
    char strgroupsb[4][3] = {{bshlcolor[0], textcolor[1], '\0'},
                             {bshlcolor[2], textcolor[3], '\0'},
                             {bshlcolor[4], textcolor[5], '\0'},
                             {bshlcolor[6], textcolor[7], '\0'}};
    uint32_t bshl16[4] = {(strtol(strgroupsb[0], NULL, 16)),
                          (strtol(strgroupsb[1], NULL, 16)),
                          (strtol(strgroupsb[2], NULL, 16)),
                          (strtol(strgroupsb[3], NULL, 16))};
#endif

    if (unlock_state >= STATE_KEY_PRESSED && unlock_indicator) {
        /* Draw a (centered) circle with transparent background. */
        cairo_set_line_width(ctx, 10.0);
        cairo_arc(ctx,
                  BUTTON_CENTER /* x */,
                  BUTTON_CENTER /* y */,
                  BUTTON_RADIUS /* radius */,
                  0 /* start */,
                  2 * M_PI /* end */);

        /* Use the appropriate color for the different PAM states
         * (currently verifying, wrong password, or default) */
        switch (pam_state) {
            case STATE_PAM_VERIFY:
                cairo_set_source_rgba(ctx, (double)insidever16[0]/255, (double)insidever16[1]/255, (double)insidever16[2]/255, (double)insidever16[3]/255);
                break;
            case STATE_PAM_WRONG:
                cairo_set_source_rgba(ctx, (double)insidewrong16[0]/255, (double)insidewrong16[1]/255, (double)insidewrong16[2]/255, (double)insidewrong16[3]/255);
                break;
            default:
                cairo_set_source_rgba(ctx, (double)inside16[0]/255, (double)inside16[1]/255, (double)inside16[2]/255, (double)inside16[3]/255);
                break;
        }
        cairo_fill_preserve(ctx);

        switch (pam_state) {
            case STATE_PAM_VERIFY:
                cairo_set_source_rgba(ctx, (double)ringver16[0]/255, (double)ringver16[1]/255, (double)ringver16[2]/255, (double)ringver16[3]/255);
                break;
            case STATE_PAM_WRONG:
                cairo_set_source_rgba(ctx, (double)ringwrong16[0]/255, (double)ringwrong16[1]/255, (double)ringwrong16[2]/255, (double)ringwrong16[3]/255);
                break;
            case STATE_PAM_IDLE:
                cairo_set_source_rgba(ctx, (double)ring16[0]/255, (double)ring16[1]/255, (double)ring16[2]/255, (double)ring16[3]/255);
                break;
        }
        cairo_stroke(ctx);

        /* Draw an inner seperator line. */
        cairo_set_source_rgba(ctx, (double)line16[0]/255, (double)line16[1]/255, (double)line16[2]/255, (double)line16[3]/255);
        cairo_set_line_width(ctx, 2.0);
        cairo_arc(ctx,
                  BUTTON_CENTER /* x */,
                  BUTTON_CENTER /* y */,
                  BUTTON_RADIUS - 5 /* radius */,
                  0,
                  2 * M_PI);

  void flush()
  {
    cairo_surface_t *surface = cairo_image_surface_create(CAIRO_FORMAT_A8, _totalWidth, _maxHeight);
    cairo_t *cr = cairo_create(surface);
    int pos = 0;
    cairo_set_source_rgba (cr, 0., 0., 0., 0);
    cairo_set_operator(cr, CAIRO_OPERATOR_SOURCE);
    cairo_paint(cr);
    cairo_set_operator(cr, CAIRO_OPERATOR_OVER);
    cairo_font_options_t *fontOptions = cairo_font_options_create();
    cairo_get_font_options(cr, fontOptions);
    cairo_font_options_set_hint_style(fontOptions, CAIRO_HINT_STYLE_FULL);
    cairo_font_options_set_antialias(fontOptions, CAIRO_ANTIALIAS_GRAY);
    cairo_set_font_options(cr, fontOptions);
    cairo_font_options_destroy(fontOptions);

    cairo_set_source_rgba(cr, 1, 1, 1, 1);
    for(std::vector<element>::iterator it = _elements.begin(); it != _elements.end();  ++it) {
      cairo_move_to(cr, pos - it->xBearing, -it->yBearing);
      cairo_set_font_size(cr, it->fontSize);
      cairo_set_font_face(cr, it->fontFace);
      cairo_show_text(cr, it->text.c_str());
      cairo_font_face_destroy(it->fontFace);
      pos += it->width;
    }
    cairo_destroy(cr);
    //setup matrices
    GLint matrixMode;
    GLuint textureId;
    glGetIntegerv (GL_MATRIX_MODE, &matrixMode);
    glMatrixMode (GL_PROJECTION);
    glPushMatrix();
    glLoadIdentity ();
    glMatrixMode (GL_MODELVIEW);
    glPushMatrix();
    glLoadIdentity ();
    float winw = Fl_Window::current()->w();
    float winh = Fl_Window::current()->h();
    glScalef (2.0f / winw, 2.0f /  winh, 1.0f);
    glTranslatef (-winw / 2.0f, -winh / 2.0f, 0.0f);
    //write the texture on screen
    glEnable(GL_TEXTURE_RECTANGLE_ARB);
    glPushAttrib(GL_ENABLE_BIT | GL_TEXTURE_BIT | GL_COLOR_BUFFER_BIT);
    glDisable(GL_LIGHTING);
    glDisable(GL_DEPTH_TEST);
    glEnable(GL_BLEND);
    glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);
    glGenTextures(1, &textureId);
    glBindTexture(GL_TEXTURE_RECTANGLE_ARB, textureId);
    glTexImage2D(GL_TEXTURE_RECTANGLE_ARB, 0, GL_ALPHA,
                 cairo_image_surface_get_width(surface),
                 cairo_image_surface_get_height(surface), 0,
                 GL_ALPHA, GL_UNSIGNED_BYTE, cairo_image_surface_get_data(surface));
    //glTexEnvi (GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_SRC0_ALPHA);
    //printf("error %i %s\n", __LINE__, gluErrorString(glGetError()));
    glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST);

    pos = 0;
    for(std::vector<element>::iterator it = _elements.begin(); it != _elements.end();  ++it) {
      glTranslatef(it->x, it->y, it->z);
      glColor4f(it->r, it->g, it->b, it->alpha);
      int Lx = it->width;
      int Ly = it->height;

      glBegin (GL_QUADS);
      glTexCoord2f (pos, 0);
      glVertex2f (0.0f, Ly);
      glTexCoord2f (pos + Lx, 0);
      glVertex2f (Lx, Ly);
      glTexCoord2f (pos + Lx, Ly);
      glVertex2f (Lx, 0.0f);
      glTexCoord2f (pos, Ly);
      glVertex2f (0.0f, 0.0f);
      glEnd ();
      pos += Lx;
      glTranslatef(-it->x, -it->y, -it->z);
    }
    glDeleteTextures(1, &textureId);

    glPopAttrib();

    // reset original matrices
    glPopMatrix(); // GL_MODELVIEW
    glMatrixMode (GL_PROJECTION);
    glPopMatrix();
    glMatrixMode (matrixMode);
    _elements.clear();
    _maxHeight = 0;
    _totalWidth = 0;
    cairo_surface_destroy(surface);
  }

static gboolean lowlight_draw(GtkWidget *widget, cairo_t *crf, gpointer user_data)
{
  dt_iop_module_t *self = (dt_iop_module_t *)user_data;
  dt_iop_lowlight_gui_data_t *c = (dt_iop_lowlight_gui_data_t *)self->gui_data;
  dt_iop_lowlight_params_t p = *(dt_iop_lowlight_params_t *)self->params;

  dt_draw_curve_set_point(c->transition_curve, 0, p.transition_x[DT_IOP_LOWLIGHT_BANDS - 2] - 1.0,
                          p.transition_y[0]);
  for(int k = 0; k < DT_IOP_LOWLIGHT_BANDS; k++)
    dt_draw_curve_set_point(c->transition_curve, k + 1, p.transition_x[k], p.transition_y[k]);
  dt_draw_curve_set_point(c->transition_curve, DT_IOP_LOWLIGHT_BANDS + 1, p.transition_x[1] + 1.0,
                          p.transition_y[DT_IOP_LOWLIGHT_BANDS - 1]);

  const int inset = DT_IOP_LOWLIGHT_INSET;
  GtkAllocation allocation;
  gtk_widget_get_allocation(widget, &allocation);
  int width = allocation.width, height = allocation.height;
  cairo_surface_t *cst = dt_cairo_image_surface_create(CAIRO_FORMAT_ARGB32, width, height);
  cairo_t *cr = cairo_create(cst);

  cairo_set_source_rgb(cr, .2, .2, .2);
  cairo_paint(cr);

  cairo_translate(cr, inset, inset);
  width -= 2 * inset;
  height -= 2 * inset;

  cairo_set_line_width(cr, DT_PIXEL_APPLY_DPI(1.0));
  cairo_set_source_rgb(cr, .1, .1, .1);
  cairo_rectangle(cr, 0, 0, width, height);
  cairo_stroke(cr);

  cairo_set_source_rgb(cr, .3, .3, .3);
  cairo_rectangle(cr, 0, 0, width, height);
  cairo_fill(cr);

  // draw grid
  cairo_set_line_width(cr, DT_PIXEL_APPLY_DPI(.4));
  cairo_set_source_rgb(cr, .1, .1, .1);
  dt_draw_grid(cr, 8, 0, 0, width, height);


  if(c->mouse_y > 0 || c->dragging)
  {
    // draw min/max curves:
    dt_iop_lowlight_get_params(&p, c->mouse_x, 1., c->mouse_radius);
    dt_draw_curve_set_point(c->transition_curve, 0, p.transition_x[DT_IOP_LOWLIGHT_BANDS - 2] - 1.0,
                            p.transition_y[0]);
    for(int k = 0; k < DT_IOP_LOWLIGHT_BANDS; k++)
      dt_draw_curve_set_point(c->transition_curve, k + 1, p.transition_x[k], p.transition_y[k]);
    dt_draw_curve_set_point(c->transition_curve, DT_IOP_LOWLIGHT_BANDS + 1, p.transition_x[1] + 1.0,
                            p.transition_y[DT_IOP_LOWLIGHT_BANDS - 1]);
    dt_draw_curve_calc_values(c->transition_curve, 0.0, 1.0, DT_IOP_LOWLIGHT_RES, c->draw_min_xs,
                              c->draw_min_ys);

    p = *(dt_iop_lowlight_params_t *)self->params;
    dt_iop_lowlight_get_params(&p, c->mouse_x, .0, c->mouse_radius);
    dt_draw_curve_set_point(c->transition_curve, 0, p.transition_x[DT_IOP_LOWLIGHT_BANDS - 2] - 1.0,
                            p.transition_y[0]);
    for(int k = 0; k < DT_IOP_LOWLIGHT_BANDS; k++)
      dt_draw_curve_set_point(c->transition_curve, k + 1, p.transition_x[k], p.transition_y[k]);
    dt_draw_curve_set_point(c->transition_curve, DT_IOP_LOWLIGHT_BANDS + 1, p.transition_x[1] + 1.0,
                            p.transition_y[DT_IOP_LOWLIGHT_BANDS - 1]);
    dt_draw_curve_calc_values(c->transition_curve, 0.0, 1.0, DT_IOP_LOWLIGHT_RES, c->draw_max_xs,
                              c->draw_max_ys);
  }

  cairo_save(cr);

  // draw x positions
  cairo_set_source_rgb(cr, 0.6, 0.6, 0.6);
  cairo_set_line_width(cr, DT_PIXEL_APPLY_DPI(1.));
  const float arrw = DT_PIXEL_APPLY_DPI(7.0f);
  for(int k = 0; k < DT_IOP_LOWLIGHT_BANDS; k++)
  {
    cairo_move_to(cr, width * p.transition_x[k], height + inset - DT_PIXEL_APPLY_DPI(1));
    cairo_rel_line_to(cr, -arrw * .5f, 0);
    cairo_rel_line_to(cr, arrw * .5f, -arrw);
    cairo_rel_line_to(cr, arrw * .5f, arrw);
    cairo_close_path(cr);
    if(c->x_move == k)
      cairo_fill(cr);
    else
      cairo_stroke(cr);
  }

  // draw selected cursor
  cairo_translate(cr, 0, height);

  // cairo_set_operator(cr, CAIRO_OPERATOR_ADD);
  // cairo_set_operator(cr, CAIRO_OPERATOR_OVER);
  cairo_set_line_width(cr, DT_PIXEL_APPLY_DPI(2.));
  cairo_set_source_rgba(cr, .7, .7, .7, 1.0);

  p = *(dt_iop_lowlight_params_t *)self->params;
  dt_draw_curve_set_point(c->transition_curve, 0, p.transition_x[DT_IOP_LOWLIGHT_BANDS - 2] - 1.0,
                          p.transition_y[0]);
  for(int k = 0; k < DT_IOP_LOWLIGHT_BANDS; k++)
    dt_draw_curve_set_point(c->transition_curve, k + 1, p.transition_x[k], p.transition_y[k]);
  dt_draw_curve_set_point(c->transition_curve, DT_IOP_LOWLIGHT_BANDS + 1, p.transition_x[1] + 1.0,
//.........这里部分代码省略.........

static gboolean
on_expose_event (GtkWidget          *widget,
                 GdkEventExpose     *event,
                 GsdMediaKeysWindow *window)
{
        cairo_t         *context;
        cairo_t         *cr;
        cairo_surface_t *surface;
        int              width;
        int              height;
        GtkStyle        *style;
        GdkColor         color;
        double           r, g, b;

        context = gdk_cairo_create (gtk_widget_get_window (widget));

        style = gtk_widget_get_style (widget);
        cairo_set_operator (context, CAIRO_OPERATOR_SOURCE);
        gtk_window_get_size (GTK_WINDOW (widget), &width, &height);

        surface = cairo_surface_create_similar (cairo_get_target (context),
                                                CAIRO_CONTENT_COLOR_ALPHA,
                                                width,
                                                height);

        if (cairo_surface_status (surface) != CAIRO_STATUS_SUCCESS) {
                goto done;
        }

        cr = cairo_create (surface);
        if (cairo_status (cr) != CAIRO_STATUS_SUCCESS) {
                goto done;
        }
        cairo_set_source_rgba (cr, 1.0, 1.0, 1.0, 0.0);
        cairo_set_operator (cr, CAIRO_OPERATOR_OVER);
        cairo_paint (cr);

        /* draw a box */
        rounded_rectangle (cr, 1.0, 0.5, 0.5, height / 10, width-1, height-1);
        color_reverse (&style->bg[GTK_STATE_NORMAL], &color);
        r = (float)color.red / 65535.0;
        g = (float)color.green / 65535.0;
        b = (float)color.blue / 65535.0;
        cairo_set_source_rgba (cr, r, g, b, BG_ALPHA);
        cairo_fill_preserve (cr);

        color_reverse (&style->text_aa[GTK_STATE_NORMAL], &color);
        r = (float)color.red / 65535.0;
        g = (float)color.green / 65535.0;
        b = (float)color.blue / 65535.0;
        cairo_set_source_rgba (cr, r, g, b, BG_ALPHA / 2);
        cairo_set_line_width (cr, 1);
        cairo_stroke (cr);

        /* draw action */
        draw_action (window, cr);

        cairo_destroy (cr);

        /* Make sure we have a transparent background */
        cairo_rectangle (context, 0, 0, width, height);
        cairo_set_source_rgba (context, 0.0, 0.0, 0.0, 0.0);
        cairo_fill (context);

        cairo_set_source_surface (context, surface, 0, 0);
        cairo_paint_with_alpha (context, window->priv->fade_out_alpha);

 done:
        if (surface != NULL) {
                cairo_surface_destroy (surface);
        }
        cairo_destroy (context);

        return FALSE;
}

/* This is our expose-event handler when the window is in a compositing manager.
 * We draw everything by hand, using Cairo, so that we can have a nice
 * transparent/rounded look.
 */
static void
expose_when_composited (GtkWidget *widget, GdkEventExpose *event)
{
	MsdOsdWindow    *window;
        cairo_t         *context;
        cairo_t         *cr;
        cairo_surface_t *surface;
        int              width;
        int              height;
        GtkStyle        *style;
        GdkColor         color;
        double           r, g, b;

	window = MSD_OSD_WINDOW (widget);

        context = gdk_cairo_create (gtk_widget_get_window (widget));

        style = gtk_widget_get_style (widget);
        cairo_set_operator (context, CAIRO_OPERATOR_SOURCE);
        gtk_window_get_size (GTK_WINDOW (widget), &width, &height);

        surface = cairo_surface_create_similar (cairo_get_target (context),
                                                CAIRO_CONTENT_COLOR_ALPHA,
                                                width,
                                                height);

        if (cairo_surface_status (surface) != CAIRO_STATUS_SUCCESS) {
                goto done;
        }

        cr = cairo_create (surface);
        if (cairo_status (cr) != CAIRO_STATUS_SUCCESS) {
                goto done;
        }
        cairo_set_source_rgba (cr, 1.0, 1.0, 1.0, 0.0);
        cairo_set_operator (cr, CAIRO_OPERATOR_OVER);
        cairo_paint (cr);

        /* draw a box */
        msd_osd_window_draw_rounded_rectangle (cr, 1.0, 0.5, 0.5, height / 10, width-1, height-1);
        msd_osd_window_color_reverse (&style->bg[GTK_STATE_NORMAL], &color);
        r = (float)color.red / 65535.0;
        g = (float)color.green / 65535.0;
        b = (float)color.blue / 65535.0;
        cairo_set_source_rgba (cr, r, g, b, BG_ALPHA);
        cairo_fill_preserve (cr);

        msd_osd_window_color_reverse (&style->text_aa[GTK_STATE_NORMAL], &color);
        r = (float)color.red / 65535.0;
        g = (float)color.green / 65535.0;
        b = (float)color.blue / 65535.0;
        cairo_set_source_rgba (cr, r, g, b, BG_ALPHA / 2);
        cairo_set_line_width (cr, 1);
        cairo_stroke (cr);

        g_signal_emit (window, signals[EXPOSE_WHEN_COMPOSITED], 0, cr);

        cairo_destroy (cr);

        /* Make sure we have a transparent background */
        cairo_rectangle (context, 0, 0, width, height);
        cairo_set_source_rgba (context, 0.0, 0.0, 0.0, 0.0);
        cairo_fill (context);

        cairo_set_source_surface (context, surface, 0, 0);
        cairo_paint_with_alpha (context, window->priv->fade_out_alpha);

 done:
        if (surface != NULL) {
                cairo_surface_destroy (surface);
        }
        cairo_destroy (context);
}

void CanvasCairo::pathFillStroke(const Color4B &fill, const Color4B &stroke) {
	cairo_set_source_rgba(_context, fill.r / 255.0, fill.g / 255.0, fill.b / 255.0, fill.a / 255.0);
	cairo_fill_preserve(_context);
	cairo_set_source_rgba(_context, stroke.r / 255.0, stroke.g / 255.0, stroke.b / 255.0, stroke.a / 255.0);
	cairo_stroke(_context);
}

static void dt_ellipse_events_post_expose(cairo_t *cr, float zoom_scale, dt_masks_form_gui_t *gui, int index)
{
  double dashed[] = { 4.0, 4.0 };
  dashed[0] /= zoom_scale;
  dashed[1] /= zoom_scale;
  int len = sizeof(dashed) / sizeof(dashed[0]);
  dt_masks_form_gui_points_t *gpt = (dt_masks_form_gui_points_t *)g_list_nth_data(gui->points, index);
  if(!gpt) return;

  const float r = atan2(gpt->points[3] - gpt->points[1], gpt->points[2] - gpt->points[0]);
  const float sinr = sin(r);
  const float cosr = cos(r);

  float dx = 0.0f, dy = 0.0f, xref = gpt->points[0], yref = gpt->points[1];
  float dxs = 0.0f, dys = 0.0f, xrefs = 0.0f, yrefs = 0.0f;
  float sinv = 0.0f, cosv = 1.0f;
  float scalea = 1.0f, scaleb = 1.0f, scaleab = 1.0f, scalebb = 1.0f;

  if(gpt->source_count > 10)
  {
    xrefs = gpt->source[0];
    yrefs = gpt->source[1];
  }
  if((gui->group_selected == index) && gui->form_dragging)
  {
    dx = gui->posx + gui->dx - xref;
    dy = gui->posy + gui->dy - yref;
  }
  else if((gui->group_selected == index) && gui->source_dragging)
  {
    xrefs = gpt->source[0], yrefs = gpt->source[1];
    dxs = gui->posx + gui->dx - xrefs;
    dys = gui->posy + gui->dy - yrefs;
  }
  else if((gui->group_selected == index) && gui->form_rotating)
  {
    const float v = atan2(gui->posy - yref, gui->posx - xref) - atan2(-gui->dy, -gui->dx);
    sinv = sin(v);
    cosv = cos(v);
  }
  else if((gui->group_selected == index) && (gui->point_dragging >= 1))
  {
    const int k = gui->point_dragging;
    const float rx = gpt->points[k * 2] - xref;
    const float ry = gpt->points[k * 2 + 1] - yref;
    const float bx = gpt->border[k * 2] - xref;
    const float by = gpt->border[k * 2 + 1] - yref;
    const float deltax = gui->posx + gui->dx - xref;
    const float deltay = gui->posy + gui->dy - yref;

    const float r = sqrtf(rx * rx + ry * ry);
    const float b = sqrtf(bx * bx + by * by);
    float d = (rx * deltax + ry * deltay) / r;
    if(r + d < 0) d = -r;

    if(k == 1 || k == 2)
    {
      scalea = r > 0 ? (r + d) / r : 0;
      scaleab = b > 0 ? (b + d) / b : 0;
    }
    else
    {
      scaleb = r > 0 ? (r + d) / r : 0;
      scalebb = b > 0 ? (b + d) / b : 0;
    }
  }

  float x, y;

  // draw shape
  if(gpt->points_count > 10)
  {
    cairo_set_dash(cr, dashed, 0, 0);
    if((gui->group_selected == index) && (gui->form_selected || gui->form_dragging))
      cairo_set_line_width(cr, 5.0 / zoom_scale);
    else
      cairo_set_line_width(cr, 3.0 / zoom_scale);
    cairo_set_source_rgba(cr, .3, .3, .3, .8);

    _ellipse_point_transform(xref, yref, gpt->points[10] + dx, gpt->points[11] + dy, sinr, cosr, scalea,
                             scaleb, sinv, cosv, &x, &y);
    cairo_move_to(cr, x, y);
    for(int i = 6; i < gpt->points_count; i++)
    {
      _ellipse_point_transform(xref, yref, gpt->points[i * 2] + dx, gpt->points[i * 2 + 1] + dy, sinr, cosr,
                               scalea, scaleb, sinv, cosv, &x, &y);
      cairo_line_to(cr, x, y);
    }
    _ellipse_point_transform(xref, yref, gpt->points[10] + dx, gpt->points[11] + dy, sinr, cosr, scalea,
                             scaleb, sinv, cosv, &x, &y);
    cairo_line_to(cr, x, y);
    cairo_stroke_preserve(cr);
    if((gui->group_selected == index) && (gui->form_selected || gui->form_dragging))
      cairo_set_line_width(cr, 2.0 / zoom_scale);
    else
      cairo_set_line_width(cr, 1.0 / zoom_scale);
    cairo_set_source_rgba(cr, .8, .8, .8, .8);
    cairo_stroke(cr);
  }

//.........这里部分代码省略.........

//.........这里部分代码省略.........
    case DT_IOP_COLORZONES_C:
      picked_i = pickC / 128.0;
      break;
    default: // case DT_IOP_COLORZONES_h:
      picked_i = fmodf(atan2f(self->picked_color[2], self->picked_color[1]) + 2.0*M_PI, 2.0*M_PI)/(2.0*M_PI);
      break;
  }
  cairo_save(cr);
  cairo_set_source_rgb(cr, 1.0, 1.0, 1.0);
  cairo_set_operator(cr, CAIRO_OPERATOR_XOR);
  cairo_set_line_width(cr, 2.);
  cairo_move_to(cr, width*picked_i, 0.0);
  cairo_line_to(cr, width*picked_i, height);
  cairo_stroke(cr);
  cairo_restore(cr);

  // draw x positions
  cairo_set_source_rgb(cr, 0.6, 0.6, 0.6);
  cairo_set_line_width(cr, 1.);
  const float arrw = 7.0f;
  for(int k=0; k<DT_IOP_COLORZONES_BANDS; k++)
  {
    cairo_move_to(cr, width*p.equalizer_x[c->channel][k], height+inset-1);
    cairo_rel_line_to(cr, -arrw*.5f, 0);
    cairo_rel_line_to(cr, arrw*.5f, -arrw);
    cairo_rel_line_to(cr, arrw*.5f, arrw);
    cairo_close_path(cr);
    if(c->x_move == k) cairo_fill(cr);
    else               cairo_stroke(