/****************************************************************************
- * RRDtool 1.1.x Copyright Tobias Oetiker, 1997 - 2002
+ * RRDtool 1.2.23 Copyright by Tobi Oetiker, 1997-2007
****************************************************************************
* 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
+# ifdef DEBUG
+# define RRDPRINTF(...) fprintf(stderr, __VA_ARGS__);
+# else
+# define RRDPRINTF(...)
+# endif /* DEBUG */
+#endif /* _MSC_VER */
-#include <png.h>
-#include <ft2build.h>
-#include FT_FREETYPE_H
-#include <math.h>
+#include "rrd_tool.h"
+#include "rrd_graph.h"
-#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;
-}
-
-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[] = { dash_on, dash_off };
+ double x = 0;
+ double y = 0;
+
+ 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;
-
- return node;
+/* 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);
}
/* 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);
-
- } else {
- /* can only add point to areas and lines */
- return 1;
- }
- return 0;
+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);
}
+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);
-
- 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 */
+/* create a text node */
+static PangoLayout *gfx_prep_text(
+ image_desc_t *im,
+ double x,
+ gfx_color_t color,
+ char *font,
+ double size,
+ double tabwidth,
+ const char *text)
+{
+ PangoLayout *layout;
+ PangoFontDescription *font_desc;
+ cairo_t *cr = im->cr;
+
+ /* 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);
+
+ PangoTabArray *tab_array;
+ PangoContext *pango_context;
+
+ 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);
}
- 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 */
- FT_Done_FreeType(library);
- return text_width;
+ cairo_new_path(cr);
+ cairo_set_source_rgba(cr, color.red, color.green, color.blue,
+ color.alpha);
+ layout = pango_cairo_create_layout(cr);
+ pango_context = pango_layout_get_context(layout);
+ pango_cairo_context_set_font_options(pango_context, im->font_options);
+ pango_cairo_update_context(cr, pango_context);
+
+ pango_layout_set_tabs(layout, tab_array);
+ font_desc = pango_font_description_from_string(font);
+ pango_font_description_set_size(font_desc, size * PANGO_SCALE);
+ pango_layout_set_font_description(layout, font_desc);
+ pango_layout_set_markup(layout, text, -1);
+ return layout;
}
-
-
-
-
-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;
-}
-
-/* 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,
+ char *font,
+ double size,
+ double tabwidth,
+ char *text)
+{
+ PangoLayout *layout;
+ PangoRectangle log_rect;
+ gfx_color_t color = { 0, 0, 0, 0 };
+ char *tab;
+
+ /* turn \\t into tab */
+ while ((tab = strstr(text, "\\t"))) {
+ memmove(tab + 1, tab + 2, strlen(tab + 2));
+ tab[0] = (char) 9;
+ }
+ layout = gfx_prep_text(im, start, color, font, size, tabwidth, text);
+ pango_layout_get_pixel_extents(layout, NULL, &log_rect);
+ pango_tab_array_free(pango_layout_get_tabs(layout));
+ 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);
+void gfx_text(
+ image_desc_t *im,
+ 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,
+ const char *text)
+{
+ PangoLayout *layout;
+ PangoRectangle log_rect;
+ PangoRectangle ink_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, size, tabwidth, text);
+ pango_layout_get_pixel_extents(layout, &ink_rect, &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;
}
-
- 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);
+ 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);
+ pango_tab_array_free(pango_layout_get_tabs(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 <tobi@oetike.ch>, 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);
}
projects / rrdtool.git / blobdiff