code.delx.au - refind/blob - libeg/text.c

   1 /*
   2  * libeg/text.c
   3  * Text drawing functions
   4  *
   5  * Copyright (c) 2006 Christoph Pfisterer
   6  * All rights reserved.
   7  *
   8  * Redistribution and use in source and binary forms, with or without
   9  * modification, are permitted provided that the following conditions are
  10  * met:
  11  *
  12  *  * Redistributions of source code must retain the above copyright
  13  *    notice, this list of conditions and the following disclaimer.
  14  *
  15  *  * Redistributions in binary form must reproduce the above copyright
  16  *    notice, this list of conditions and the following disclaimer in the
  17  *    documentation and/or other materials provided with the
  18  *    distribution.
  19  *
  20  *  * Neither the name of Christoph Pfisterer nor the names of the
  21  *    contributors may be used to endorse or promote products derived
  22  *    from this software without specific prior written permission.
  23  *
  24  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
  25  * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
  26  * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
  27  * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
  28  * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
  29  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
  30  * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  31  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  32  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  33  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
  34  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  35  */
  36
  37 #include "libegint.h"
  38
  39 #include "egemb_font.h"
  40 #define FONT_CELL_WIDTH (7)
  41 #define FONT_CELL_HEIGHT (12)
  42
  43 static EG_IMAGE *FontImage = NULL;
  44
  45 //
  46 // Text rendering
  47 //
  48
  49 VOID egMeasureText(IN CHAR16 *Text, OUT UINTN *Width, OUT UINTN *Height)
  50 {
  51     if (Width != NULL)
  52         *Width = StrLen(Text) * FONT_CELL_WIDTH;
  53     if (Height != NULL)
  54         *Height = FONT_CELL_HEIGHT;
  55 }
  56
  57 VOID egRenderText(IN CHAR16 *Text, IN OUT EG_IMAGE *CompImage, IN UINTN PosX, IN UINTN PosY)
  58 {
  59     EG_PIXEL        *BufferPtr;
  60     EG_PIXEL        *FontPixelData;
  61     UINTN           BufferLineOffset, FontLineOffset;
  62     UINTN           TextLength;
  63     UINTN           i, c;
  64
  65     // clip the text
  66     TextLength = StrLen(Text);
  67     if (TextLength * FONT_CELL_WIDTH + PosX > CompImage->Width)
  68         TextLength = (CompImage->Width - PosX) / FONT_CELL_WIDTH;
  69
  70     // load the font
  71     if (FontImage == NULL)
  72         FontImage = egPrepareEmbeddedImage(&egemb_font, TRUE);
  73
  74     // render it
  75     BufferPtr = CompImage->PixelData;
  76     BufferLineOffset = CompImage->Width;
  77     BufferPtr += PosX + PosY * BufferLineOffset;
  78     FontPixelData = FontImage->PixelData;
  79     FontLineOffset = FontImage->Width;
  80     for (i = 0; i < TextLength; i++) {
  81         c = Text[i];
  82         if (c < 32 || c >= 127)
  83             c = 95;
  84         else
  85             c -= 32;
  86         egRawCompose(BufferPtr, FontPixelData + c * FONT_CELL_WIDTH,
  87                      FONT_CELL_WIDTH, FONT_CELL_HEIGHT,
  88                      BufferLineOffset, FontLineOffset);
  89         BufferPtr += FONT_CELL_WIDTH;
  90     }
  91 }
  92
  93 /* EOF */