-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 );
- use_kerning = FT_HAS_KERNING(face);
-
- if ( error ) break;
- error = FT_Set_Char_Size(face, /* handle to face object */
- (long)(node->size*64),
- (long)(node->size*64),
- (long)(100*zoom),
- (long)(100*zoom));
- 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 (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 );
- 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);
- return 0;