X-Git-Url: https://git.octo.it/?a=blobdiff_plain;f=src%2Frrd_gfx.c;h=416b8a32ada2244d9567498688c920e6b526afb7;hb=96b0f4aace0deef034a792a08dc2d426cd2b61a4;hp=1a45439da3d0eb542967f9499cccee785962fb0b;hpb=b7ba62419191213693d0b47c441d65d3ef88a685;p=rrdtool.git diff --git a/src/rrd_gfx.c b/src/rrd_gfx.c index 1a45439..416b8a3 100644 --- a/src/rrd_gfx.c +++ b/src/rrd_gfx.c @@ -1,515 +1,354 @@ /**************************************************************************** - * RRDtool 1.1.x Copyright Tobias Oetiker, 1997 - 2002 + * RRDtool 1.4.3 Copyright by Tobi Oetiker, 1997-2010 **************************************************************************** * rrd_gfx.c graphics wrapper for rrdtool **************************************************************************/ /* #define DEBUG */ -#ifdef DEBUG -# define DPRINT(x) (void)(printf x, printf("\n")) +/* stupid MSVC doesnt support variadic macros = no debug for now! */ +#ifdef _MSC_VER +# define RRDPRINTF() #else -# define DPRINT(x) -#endif - -#include -#include -#include FT_FREETYPE_H -#include - -#include "rrd_gfx.h" - -/* lines are better drawn on the pixle than between pixles */ -#define LINEOFFSET 0.5 - -static -gfx_node_t *gfx_new_node( gfx_canvas_t *canvas,enum gfx_en type){ - gfx_node_t *node = art_new(gfx_node_t,1); - if (node == NULL) return NULL; - node->type = type; - node->color = 0x0; /* color of element 0xRRGGBBAA alpha 0xff is solid*/ - node->size =0.0; /* font size, line width */ - node->path = NULL; /* path */ - node->points = 0; - node->points_max =0; - node->svp = NULL; /* svp */ - node->filename = NULL; /* font or image filename */ - node->text = NULL; - node->x = 0.0; - node->y = 0.0; /* position */ - node->halign = GFX_H_NULL; /* text alignement */ - node->valign = GFX_V_NULL; /* text alignement */ - node->tabwidth = 0.0; - node->next = NULL; - if (canvas->lastnode != NULL){ - canvas->lastnode->next = node; - } - if (canvas->firstnode == NULL){ - canvas->firstnode = node; - } - canvas->lastnode = node; - return node; -} +# ifdef DEBUG +# define RRDPRINTF(...) fprintf(stderr, __VA_ARGS__); +# else +# define RRDPRINTF(...) +# endif /* DEBUG */ +#endif /* _MSC_VER */ + +#include "rrd_tool.h" +#include "rrd_graph.h" -gfx_canvas_t *gfx_new_canvas (void) { - gfx_canvas_t *canvas = art_new(gfx_canvas_t,1); - canvas->firstnode = NULL; - canvas->lastnode = NULL; - return canvas; -} /* create a new line */ -gfx_node_t *gfx_new_line(gfx_canvas_t *canvas, - double x0, double y0, - double x1, double y1, - double width, gfx_color_t color){ - - gfx_node_t *node; - ArtVpath *vec; - node = gfx_new_node(canvas,GFX_LINE); - if (node == NULL) return NULL; - vec = art_new(ArtVpath, 3); - if (vec == NULL) return NULL; - vec[0].code = ART_MOVETO_OPEN; vec[0].x=x0+LINEOFFSET; vec[0].y=y0+LINEOFFSET; - vec[1].code = ART_LINETO; vec[1].x=x1+LINEOFFSET; vec[1].y=y1+LINEOFFSET; - vec[2].code = ART_END; - - node->points = 3; - node->points_max = 3; - node->color = color; - node->size = width; - node->path = vec; - return node; +void gfx_line( + image_desc_t *im, + double X0, + double Y0, + double X1, + double Y1, + double width, + gfx_color_t color) +{ + gfx_dashed_line(im, X0, Y0, X1, Y1, width, color, 0, 0); } -/* create a new area */ -gfx_node_t *gfx_new_area (gfx_canvas_t *canvas, - double x0, double y0, - double x1, double y1, - double x2, double y2, - gfx_color_t color) { - - gfx_node_t *node; - ArtVpath *vec; - node = gfx_new_node(canvas,GFX_AREA); - if (node == NULL) return NULL; - vec = art_new(ArtVpath, 5); - if (vec == NULL) return NULL; - vec[0].code = ART_MOVETO; vec[0].x=x0; vec[0].y=y0; - vec[1].code = ART_LINETO; vec[1].x=x1; vec[1].y=y1; - vec[2].code = ART_LINETO; vec[2].x=x2; vec[2].y=y2; - vec[3].code = ART_LINETO; vec[3].x=x0; vec[3].y=y0; - vec[4].code = ART_END; - - node->points = 5; - node->points_max = 5; - node->color = color; - node->path = vec; - - return node; +void gfx_dashed_line( + image_desc_t *im, + double X0, + double Y0, + double X1, + double Y1, + double width, + gfx_color_t color, + double dash_on, + double dash_off) +{ + cairo_t *cr = im->cr; + double dashes[2]; + double x = 0; + double y = 0; + + dashes[0] = dash_on; + dashes[1] = dash_off; + + cairo_save(cr); + cairo_new_path(cr); + cairo_set_line_width(cr, width); + gfx_line_fit(im, &x, &y); + gfx_line_fit(im, &X0, &Y0); + cairo_move_to(cr, X0, Y0); + gfx_line_fit(im, &X1, &Y1); + cairo_line_to(cr, X1, Y1); + if (dash_on > 0 || dash_off > 0) + cairo_set_dash(cr, dashes, 2, x); + cairo_set_source_rgba(cr, color.red, color.green, color.blue, + color.alpha); + cairo_stroke(cr); + cairo_restore(cr); } -/* create an arc section (2*M_PI is full circle) */ -gfx_node_t *gfx_arc_sect (gfx_canvas_t *canvas, - double centerx, double centery, - double radiusx, double radiusy, - double start, double end, - gfx_color_t color) { - - gfx_node_t *node; - ArtVpath *vec; - int counter; - double position; - -/* 20 is too low, 100 is overkill */ -#define AMOUNT_OF_VECTORS 50 - - node = gfx_new_node(canvas,GFX_AREA); - if (node == NULL) return NULL; - vec = art_new(ArtVpath, AMOUNT_OF_VECTORS+4); - if (vec == NULL) return NULL; - - vec[0].code = ART_MOVETO; - vec[0].x = centerx; - vec[0].y = centery; - - for (counter=0;counter<=AMOUNT_OF_VECTORS;) { - position=start + counter*(end-start)/AMOUNT_OF_VECTORS; - - counter++; - vec[counter].code = ART_LINETO; - vec[counter].x = centerx + sin(position)*radiusx; - vec[counter].y = centery - cos(position)*radiusy; - } - - vec[AMOUNT_OF_VECTORS+2].code = ART_LINETO; - vec[AMOUNT_OF_VECTORS+2].x = centerx; - vec[AMOUNT_OF_VECTORS+2].y = centery; - vec[AMOUNT_OF_VECTORS+3].code = ART_END; - - node->points = AMOUNT_OF_VECTORS+4; - node->points_max = AMOUNT_OF_VECTORS+4; - node->color = color; - node->path = vec; +/* create a new area */ +void gfx_new_area( + image_desc_t *im, + double X0, + double Y0, + double X1, + double Y1, + double X2, + double Y2, + gfx_color_t color) +{ + cairo_t *cr = im->cr; + + cairo_new_path(cr); + gfx_area_fit(im, &X0, &Y0); + cairo_move_to(cr, X0, Y0); + gfx_area_fit(im, &X1, &Y1); + cairo_line_to(cr, X1, Y1); + gfx_area_fit(im, &X2, &Y2); + cairo_line_to(cr, X2, Y2); + cairo_set_source_rgba(cr, color.red, color.green, color.blue, + color.alpha); +} - return node; +/* add a point to a line or to an area */ +void gfx_add_point( + image_desc_t *im, + double x, + double y) +{ + cairo_t *cr = im->cr; + + gfx_area_fit(im, &x, &y); + cairo_line_to(cr, x, y); } /* add a point to a line or to an area */ -int gfx_add_point (gfx_node_t *node, - double x, double y){ - if (node == NULL) return 1; - if (node->type == GFX_AREA) { - double x0 = node->path[0].x; - double y0 = node->path[0].y; - node->points -= 2; - art_vpath_add_point (&(node->path), - &(node->points), - &(node->points_max), - ART_LINETO, - x,y); - art_vpath_add_point (&(node->path), - &(node->points), - &(node->points_max), - ART_LINETO, - x0,y0); - art_vpath_add_point (&(node->path), - &(node->points), - &(node->points_max), - ART_END, - 0,0); - } else if (node->type == GFX_LINE) { - node->points -= 1; - art_vpath_add_point (&(node->path), - &(node->points), - &(node->points_max), - ART_LINETO, - x+LINEOFFSET,y+LINEOFFSET); - art_vpath_add_point (&(node->path), - &(node->points), - &(node->points_max), - ART_END, - 0,0); +void gfx_add_rect_fadey( + image_desc_t *im, + double x1,double y1, + double x2,double y2, + double py, + gfx_color_t color1, + gfx_color_t color2, + double height) +{ + cairo_t *cr = im->cr; - } else { - /* can only add point to areas and lines */ - return 1; - } - return 0; + cairo_new_path(cr); + gfx_area_fit(im, &x1, &y1); + gfx_area_fit(im, &x2, &y2); + cairo_line_to(cr, x1, y1); + cairo_line_to(cr, x1, y2); + cairo_line_to(cr, x2, y2); + cairo_line_to(cr, x2, y1); + cairo_close_path(cr); + cairo_pattern_t* p; + if (height < 0) { + p = cairo_pattern_create_linear(x1,y1,x2,y1+height); + } else if (height > 0) { + p = cairo_pattern_create_linear(x1,(y2+py)/2+height,x2,(y2+py)/2); + } else { + p = cairo_pattern_create_linear(x1,y1,x2,(y2+py)/2); + } + //cairo_pattern_t* p = cairo_pattern_create_linear(x1,py+50,x2,py); + cairo_pattern_add_color_stop_rgba(p, 1, color1.red,color1.green,color1.blue,color1.alpha); + cairo_pattern_add_color_stop_rgba(p, 0, color2.red,color2.green,color2.blue,color2.alpha); + cairo_set_source(cr, p); + cairo_pattern_destroy(p); + cairo_fill(cr); } +void gfx_close_path( + image_desc_t *im) +{ + cairo_t *cr = im->cr; - -/* create a text node */ -gfx_node_t *gfx_new_text (gfx_canvas_t *canvas, - double x, double y, gfx_color_t color, - char* font, double size, - double tabwidth, double angle, - enum gfx_h_align_en h_align, - enum gfx_v_align_en v_align, - char* text){ - gfx_node_t *node = gfx_new_node(canvas,GFX_TEXT); - if (angle != 0.0){ - /* currently we only support 0 and 270 */ - angle = 270.0; - } - - node->text = strdup(text); - node->size = size; - node->filename = strdup(font); - node->x = x; - node->y = y; - node->color = color; - node->tabwidth = tabwidth; - node->halign = h_align; - node->valign = v_align; - return node; + cairo_close_path(cr); + cairo_fill(cr); } -double gfx_get_text_width ( double start, char* font, double size, - double tabwidth, char* text){ - - FT_GlyphSlot slot; - FT_UInt previous=0; - FT_UInt glyph_index=0; - FT_Bool use_kerning; - int error; - FT_Face face; - FT_Library library=NULL; - double text_width=0; - FT_Init_FreeType( &library ); - error = FT_New_Face( library, font, 0, &face ); - if ( error ) return -1; - error = FT_Set_Char_Size(face, size*64,size*64, 100,100); - if ( error ) return -1; - - use_kerning = FT_HAS_KERNING(face); - slot = face->glyph; - for(;*text;text++) { - previous = glyph_index; - glyph_index = FT_Get_Char_Index( face, *text); +/* create a text node */ +static PangoLayout *gfx_prep_text( + image_desc_t *im, + double x, + gfx_color_t color, + PangoFontDescription *font_desc, + double tabwidth, + const char *text) +{ + PangoLayout *layout = im->layout; + const PangoFontDescription *pfd; + cairo_t *cr = im->cr; + + static double last_tabwidth = -1; + + + + /* for performance reasons we might + want todo that only once ... tabs will always + be the same */ + long i; + long tab_count = strlen(text); + long tab_shift = fmod(x, tabwidth); + int border = im->text_prop[TEXT_PROP_LEGEND].size * 2.0; - if (use_kerning && previous && glyph_index){ - FT_Vector delta; - FT_Get_Kerning( face, previous, glyph_index, - 0, &delta ); - text_width += (double)delta.x / 64.0; - - } - error = FT_Load_Glyph( face, glyph_index, 0 ); - if ( error ) { - FT_Done_FreeType(library); - return -1; - } - if (! previous) { - text_width -= (double)slot->metrics.horiBearingX / 64.0; /* add just char width */ + gchar *utf8_text; + + if (last_tabwidth < 0 || last_tabwidth != tabwidth){ + PangoTabArray *tab_array; + // fprintf(stderr,"t"); + last_tabwidth = tabwidth; + tab_array = pango_tab_array_new(tab_count, (gboolean) (1)); + for (i = 1; i <= tab_count; i++) { + pango_tab_array_set_tab(tab_array, + i, PANGO_TAB_LEFT, + tabwidth * i - tab_shift + border); + } + pango_layout_set_tabs(layout, tab_array); + pango_tab_array_free(tab_array); } - text_width += (double)slot->metrics.horiAdvance / 64.0; + pfd = pango_layout_get_font_description(layout); + + if (!pfd || !pango_font_description_equal (pfd,font_desc)){ + pango_layout_set_font_description(layout, font_desc); } - text_width -= (double)slot->metrics.horiAdvance / 64.0; /* remove last step */ - text_width += (double)slot->metrics.width / 64.0; /* add just char width */ - text_width += (double)slot->metrics.horiBearingX / 64.0; /* add just char width */ - FT_Done_FreeType(library); - return text_width; -} - +// fprintf(stderr,"%s\n",pango_font_description_to_string(pango_layout_get_font_description(layout))); + cairo_new_path(cr); + cairo_set_source_rgba(cr, color.red, color.green, color.blue, + color.alpha); +/* layout = pango_cairo_create_layout(cr); */ +// pango_cairo_context_set_font_options(pango_context, im->font_options); +// pango_cairo_context_set_resolution(pango_context, 100); -static int gfx_save_png (art_u8 *buffer, FILE *fp, - long width, long height, long bytes_per_pixel); -/* render grafics into png image */ -int gfx_render_png (gfx_canvas_t *canvas, - art_u32 width, art_u32 height, - double zoom, - gfx_color_t background, FILE *fp){ - - - FT_Library library; - gfx_node_t *node = canvas->firstnode; - art_u8 red = background >> 24, green = (background >> 16) & 0xff; - art_u8 blue = (background >> 8) & 0xff, alpha = ( background & 0xff ); - unsigned long pys_width = width * zoom; - unsigned long pys_height = height * zoom; - const int bytes_per_pixel = 3; - unsigned long rowstride = pys_width*bytes_per_pixel; /* bytes per pixel */ - art_u8 *buffer = art_new (art_u8, rowstride*pys_height); - art_rgb_run_alpha (buffer, red, green, blue, alpha, pys_width*pys_height); - FT_Init_FreeType( &library ); - while(node){ - switch (node->type) { - case GFX_LINE: - case GFX_AREA: { - ArtVpath *vec; - double dst[6]; - ArtSVP *svp; - art_affine_scale(dst,zoom,zoom); - vec = art_vpath_affine_transform(node->path,dst); - if(node->type == GFX_LINE){ - svp = art_svp_vpath_stroke ( vec, ART_PATH_STROKE_JOIN_ROUND, - ART_PATH_STROKE_CAP_ROUND, - node->size*zoom,1,1); - } else { - svp = art_svp_from_vpath ( vec ); - } - art_free(vec); - art_rgb_svp_alpha (svp ,0,0, pys_width, pys_height, - node->color, buffer, rowstride, NULL); - art_free(svp); - break; - } - case GFX_TEXT: { - int error; - float text_width=0.0, text_height = 0.0; - unsigned char *text; - art_u8 fcolor[3],falpha; - FT_Face face; - FT_GlyphSlot slot; - FT_UInt previous=0; - FT_UInt glyph_index=0; - FT_Bool use_kerning; - - float pen_x = 0.0 , pen_y = 0.0; - /* double x,y; */ - long ix,iy,iz; - - fcolor[0] = node->color >> 24; - fcolor[1] = (node->color >> 16) & 0xff; - fcolor[2] = (node->color >> 8) & 0xff; - falpha = node->color & 0xff; - error = FT_New_Face( library, - (char *)node->filename, - 0, - &face ); - if ( error ) break; - use_kerning = FT_HAS_KERNING(face); - - error = FT_Set_Char_Size(face, /* handle to face object */ - (long)(node->size*64), - (long)(node->size*64), - (long)(100*zoom), - (long)(100*zoom)); - if ( error ) break; - pen_x = node->x * zoom; - pen_y = node->y * zoom; - slot = face->glyph; - - for(text=(unsigned char *)node->text;*text;text++) { - previous = glyph_index; - glyph_index = FT_Get_Char_Index( face, *text); - - if (use_kerning && previous && glyph_index){ - FT_Vector delta; - FT_Get_Kerning( face, previous, glyph_index, - 0, &delta ); - text_width += (double)delta.x / 64.0; - - } - error = FT_Load_Glyph( face, glyph_index, 0 ); - if ( error ) break; - if (previous == 0){ - pen_x -= (double)slot->metrics.horiBearingX / 64.0; /* adjust pos for first char */ - text_width -= (double)slot->metrics.horiBearingX / 64.0; /* add just char width */ - } - if ( text_height < (double)slot->metrics.horiBearingY / 64.0 ) { - text_height = (double)slot->metrics.horiBearingY / 64.0; - } - text_width += (double)slot->metrics.horiAdvance / 64.0; - } - text_width -= (double)slot->metrics.horiAdvance / 64.0; /* remove last step */ - text_width += (double)slot->metrics.width / 64.0; /* add just char width */ - text_width += (double)slot->metrics.horiBearingX / 64.0; /* add just char width */ - - switch(node->halign){ - case GFX_H_RIGHT: pen_x -= text_width; break; - case GFX_H_CENTER: pen_x -= text_width / 2.0; break; - case GFX_H_LEFT: break; - } - - switch(node->valign){ - case GFX_V_TOP: pen_y += text_height; break; - case GFX_V_CENTER: pen_y += text_height / 2.0; break; - case GFX_V_BOTTOM: break; - } - - glyph_index=0; - for(text=(unsigned char *)node->text;*text;text++) { - int gr; - previous = glyph_index; - glyph_index = FT_Get_Char_Index( face, *text); - - if (use_kerning && previous && glyph_index){ - FT_Vector delta; - FT_Get_Kerning( face, previous, glyph_index, - 0, &delta ); - pen_x += (double)delta.x / 64.0; - - } - error = FT_Load_Glyph( face, glyph_index, FT_LOAD_RENDER ); - if ( error ) break; - gr = slot->bitmap.num_grays -1; - for (iy=0; iy < slot->bitmap.rows; iy++){ - long buf_y = iy+(pen_y+0.5)-slot->bitmap_top; - if (buf_y < 0 || buf_y >= pys_height) continue; - buf_y *= rowstride; - for (ix=0;ix < slot->bitmap.width;ix++){ - long buf_x = ix + (pen_x + 0.5) + (double)slot->bitmap_left ; - art_u8 font_alpha; - - if (buf_x < 0 || buf_x >= pys_width) continue; - buf_x *= bytes_per_pixel ; - font_alpha = *(slot->bitmap.buffer + iy * slot->bitmap.width + ix); - font_alpha = (art_u8)((double)font_alpha / gr * falpha); - for (iz = 0; iz < 3; iz++){ - art_u8 *orig = buffer + buf_y + buf_x + iz; - *orig = (art_u8)((double)*orig / gr * ( gr - font_alpha) + - (double)fcolor[iz] / gr * (font_alpha)); - } - } - } - pen_x += (double)slot->metrics.horiAdvance / 64.0; - } - } - } - node = node->next; - } - gfx_save_png(buffer,fp , pys_width,pys_height,bytes_per_pixel); - art_free(buffer); - FT_Done_FreeType( library ); - return 0; +/* pango_cairo_update_context(cr, pango_context); */ + + + /* pango expects the string to be utf-8 encoded */ + utf8_text = g_locale_to_utf8((const gchar *) text, -1, NULL, NULL, NULL); + + /* In case of an error, i.e. utf8_text == NULL (locale settings messed + * up?), we fall back to a possible "invalid UTF-8 string" warning instead + * of provoking a failed assertion in libpango. */ + if (im->with_markup) + pango_layout_set_markup(layout, utf8_text ? utf8_text : text, -1); + else + pango_layout_set_text(layout, utf8_text ? utf8_text : text, -1); + + g_free(utf8_text); + return layout; } -/* free memory used by nodes this will also remove memory required for - associated paths and svcs ... but not for text strings */ -int -gfx_destroy (gfx_canvas_t *canvas){ - gfx_node_t *next,*node = canvas->firstnode; - while(node){ - next = node->next; - art_free(node->path); - art_free(node->svp); - free(node->text); - free(node->filename); - art_free(node); - node = next; - } - return 0; +/* Size Text Node */ +double gfx_get_text_width( + image_desc_t *im, + double start, + PangoFontDescription *font_desc, + double tabwidth, + char *text) +{ + PangoLayout *layout; + PangoRectangle log_rect; + gfx_color_t color = { 0, 0, 0, 0 }; + layout = gfx_prep_text(im, start, color, font_desc, tabwidth, text); + pango_layout_get_pixel_extents(layout, NULL, &log_rect); +/* g_object_unref(layout); */ + return log_rect.width; } - -static int gfx_save_png (art_u8 *buffer, FILE *fp, long width, long height, long bytes_per_pixel){ - png_structp png_ptr = NULL; - png_infop info_ptr = NULL; - int i; - png_bytep *row_pointers; - int rowstride = width * bytes_per_pixel; - png_text text[2]; - - if (fp == NULL) - return (1); - - png_ptr = png_create_write_struct(PNG_LIBPNG_VER_STRING,NULL,NULL,NULL); - if (png_ptr == NULL) - { - return (1); - } - row_pointers = (png_bytepp)png_malloc(png_ptr, - height*sizeof(png_bytep)); - - info_ptr = png_create_info_struct(png_ptr); - - if (info_ptr == NULL) - { - png_destroy_write_struct(&png_ptr, (png_infopp)NULL); - return (1); - } - if (setjmp(png_jmpbuf(png_ptr))) - { - /* If we get here, we had a problem writing the file */ - png_destroy_write_struct(&png_ptr, &info_ptr); - return (1); +void gfx_text( + image_desc_t *im, + double x, + double y, + gfx_color_t color, + PangoFontDescription *font_desc, + double tabwidth, + double angle, + enum gfx_h_align_en h_align, + enum gfx_v_align_en v_align, + const char *text) +{ + PangoLayout *layout; + PangoRectangle log_rect; + cairo_t *cr = im->cr; + double sx = 0; + double sy = 0; + + cairo_save(cr); + cairo_translate(cr, x, y); +/* gfx_line(cr,-2,0,2,0,1,color); + gfx_line(cr,0,-2,0,2,1,color); */ + layout = gfx_prep_text(im, x, color, font_desc, tabwidth, text); + pango_layout_get_pixel_extents(layout, NULL, &log_rect); + cairo_rotate(cr, -angle * G_PI / 180.0); + sx = log_rect.x; + switch (h_align) { + case GFX_H_RIGHT: + sx -= log_rect.width; + break; + case GFX_H_CENTER: + sx -= log_rect.width / 2; + break; + case GFX_H_LEFT: + break; + case GFX_H_NULL: + break; } + sy = log_rect.y; + switch (v_align) { + case GFX_V_TOP: + break; + case GFX_V_CENTER: + sy -= log_rect.height / 2; + break; + case GFX_V_BOTTOM: + sy -= log_rect.height; + break; + case GFX_V_NULL: + break; + } + pango_cairo_update_layout(cr, layout); + cairo_move_to(cr, sx, sy); + pango_cairo_show_layout(cr, layout); +/* g_object_unref(layout); */ + cairo_restore(cr); - png_init_io(png_ptr, fp); - png_set_IHDR (png_ptr, info_ptr,width, height, - 8, PNG_COLOR_TYPE_RGB, - PNG_INTERLACE_NONE, - PNG_COMPRESSION_TYPE_DEFAULT, - PNG_FILTER_TYPE_DEFAULT); - - text[0].key = "Software"; - text[0].text = "RRDtool, Tobias Oetiker , http://tobi.oetiker.ch"; - text[0].compression = PNG_TEXT_COMPRESSION_NONE; - png_set_text (png_ptr, info_ptr, text, 1); +} - /* Write header data */ - png_write_info (png_ptr, info_ptr); +/* convert color */ +struct gfx_color_t gfx_hex_to_col( + long unsigned int color) +{ + struct gfx_color_t gfx_color; + + gfx_color.red = 1.0 / 255.0 * ((color & 0xff000000) >> (3 * 8)); + gfx_color.green = 1.0 / 255.0 * ((color & 0x00ff0000) >> (2 * 8)); + gfx_color.blue = 1.0 / 255.0 * ((color & 0x0000ff00) >> (1 * 8)); + gfx_color.alpha = 1.0 / 255.0 * (color & 0x000000ff); + return gfx_color; +} - for (i = 0; i < height; i++) - row_pointers[i] = (png_bytep) (buffer + i*rowstride); +/* gridfit_lines */ + +void gfx_line_fit( + image_desc_t *im, + double *x, + double *y) +{ + cairo_t *cr = im->cr; + double line_width; + double line_height; + + if (!im->gridfit) + return; + cairo_user_to_device(cr, x, y); + line_width = cairo_get_line_width(cr); + line_height = line_width; + cairo_user_to_device_distance(cr, &line_width, &line_height); + line_width = line_width / 2.0 - (long) (line_width / 2.0); + line_height = line_height / 2.0 - (long) (line_height / 2.0); + *x = (double) ((long) (*x + 0.5)) - line_width; + *y = (double) ((long) (*y + 0.5)) + line_height; + cairo_device_to_user(cr, x, y); +} - png_write_image(png_ptr, row_pointers); - png_write_end(png_ptr, info_ptr); - png_destroy_write_struct(&png_ptr, &info_ptr); - return 1; +/* gridfit_areas */ + +void gfx_area_fit( + image_desc_t *im, + double *x, + double *y) +{ + cairo_t *cr = im->cr; + + if (!im->gridfit) + return; + cairo_user_to_device(cr, x, y); + *x = (double) ((long) (*x + 0.5)); + *y = (double) ((long) (*y + 0.5)); + cairo_device_to_user(cr, x, y); }