created libwinnie (library), winnie (the server application) and clients

[winnie] / libwinnie / src / text.cc

diff --git a/libwinnie/src/text.cc b/libwinnie/src/text.cc
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+++ b/libwinnie/src/text.cc
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+/*
+winnie - an experimental window system
+
+Copyright (C) 2013 Eleni Maria Stea
+
+This program is free software: you can redistribute it and/or modify
+it under the terms of the GNU General Public License as published by
+the Free Software Foundation, either version 3 of the License, or
+(at your option) any later version.
+
+This program is distributed in the hope that it will be useful,
+but WITHOUT ANY WARRANTY; without even the implied warranty of
+MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+GNU General Public License for more details.
+
+You should have received a copy of the GNU General Public License
+along with this program.  If not, see <http://www.gnu.org/licenses/>.
+
+Author: Eleni Maria Stea <elene.mst@gmail.com>
+*/
+
+#include <ft2build.h>
+#include <freetype/freetype.h>
+
+#include "gfx.h"
+#include "shalloc.h"
+#include "text.h"
+#include "winnie.h"
+
+#define DPI 72
+#define FONT_PATH "/usr/share/fonts/truetype/ttf-dejavu/DejaVuSansMono.ttf"
+#define FONT_SIZE 16
+
+static int draw_glyph(Pixmap *pixmap, int x, int y, char c);
+
+struct Text {
+       FT_Library ft_lib;
+       FT_Face ft_face;
+       int text_x, text_y;
+       int text_color[3];
+};
+
+static Text *text;
+
+bool init_text()
+{
+       if(!(text = (Text*)sh_malloc(sizeof *text))) {
+               return false;
+       }
+
+       get_subsys()->text_offset = (int)((char*)text - (char*)get_pool());
+
+       if(FT_Init_FreeType(&text->ft_lib)) {
+               fprintf(stderr, "Failed to initialize the FreeType library!\n");
+               return false;
+       }
+
+       if(FT_New_Face(text->ft_lib, FONT_PATH, 0, &text->ft_face)) {
+               fprintf(stderr, "Failed to load font: %s\n", FONT_PATH);
+               return false;
+       }
+
+       if(FT_Set_Char_Size(text->ft_face, 0, FONT_SIZE * 64, DPI, DPI)) {
+               fprintf(stderr, "Failed to set font size\n");
+               return false;
+       }
+
+       set_text_color(255, 255, 255);
+
+       return true;
+}
+
+void destroy_text()
+{
+       sh_free(text);
+}
+
+void draw_text(const char *txt, Pixmap *pixmap)
+{
+       if(!pixmap) {
+               pixmap = get_framebuffer_pixmap();
+       }
+
+       while(*txt != 0) {
+               text->text_x += draw_glyph(pixmap, text->text_x, text->text_y, *txt);
+               txt++;
+       }
+}
+
+void set_text_position(int x, int y)
+{
+       text->text_x = x;
+       text->text_y = y;
+
+}
+
+void set_text_color(int r, int g, int b)
+{
+       text->text_color[0] = r;
+       text->text_color[1] = g;
+       text->text_color[2] = b;
+}
+
+static int draw_glyph(Pixmap *pixmap, int x, int y, char c)
+{
+       if(FT_Load_Char(text->ft_face, c, FT_LOAD_RENDER)) {
+               return 0;
+       }
+
+       x += text->ft_face->glyph->bitmap_left;
+       y -= text->ft_face->glyph->bitmap_top;
+
+       FT_Bitmap *ft_bmp = &text->ft_face->glyph->bitmap;
+       unsigned char *bmp_ptr = ft_bmp->buffer;
+       unsigned char *pxm_ptr = pixmap->get_image() + (pixmap->get_width() * y + x) * 4;
+
+       Rect clipping_rect = get_clipping_rect();
+
+       for(int i=0; i<ft_bmp->rows; i++) {
+               int dest_y = i + y;
+               if(dest_y >= clipping_rect.y + clipping_rect.height) {
+                       break;
+               }
+
+               if(dest_y >= clipping_rect.y) {
+                       for(int j=0; j<ft_bmp->width; j++) {
+                               int dest_x = j + x;
+
+                               if(dest_x >= clipping_rect.x + clipping_rect.width) {
+                                       break;
+                               }
+
+                               if(bmp_ptr[j] && dest_x >= clipping_rect.x) {
+                                       int a = (int)bmp_ptr[j];
+                                       pxm_ptr[4 * j] = (a * text->text_color[0] + pxm_ptr[4 * j] * (255 - a)) / 255;
+                                       pxm_ptr[4 * j + 1] = (a * text->text_color[1] + pxm_ptr[4 * j + 1] * (255 - a)) / 255;
+                                       pxm_ptr[4 * j + 2] = (a * text->text_color[2] + pxm_ptr[4 * j + 2] * (255 - a)) / 255;
+                               }
+                       }
+               }
+
+               pxm_ptr += 4 * pixmap->get_width();
+               bmp_ptr += ft_bmp->pitch;
+       }
+
+       return text->ft_face->glyph->advance.x >> 6;
+}