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 //#include "../refind/screen.h"
  39
  40 #include "egemb_font.h"
  41 #define FONT_CELL_WIDTH (7)
  42 #define FONT_CELL_HEIGHT (12)
  43
  44 static EG_IMAGE *FontImage = NULL;
  45
  46 //
  47 // Text rendering
  48 //
  49
  50 VOID egMeasureText(IN CHAR16 *Text, OUT UINTN *Width, OUT UINTN *Height)
  51 {
  52     if (Width != NULL)
  53         *Width = StrLen(Text) * FONT_CELL_WIDTH;
  54     if (Height != NULL)
  55         *Height = FONT_CELL_HEIGHT;
  56 }
  57
  58 VOID egRenderText(IN CHAR16 *Text, IN OUT EG_IMAGE *CompImage, IN UINTN PosX, IN UINTN PosY)
  59 {
  60     EG_PIXEL        *BufferPtr;
  61     EG_PIXEL        *FontPixelData;
  62     UINTN           BufferLineOffset, FontLineOffset;
  63     UINTN           TextLength;
  64     UINTN           i, c;
  65
  66     // clip the text
  67     if (Text)
  68        TextLength = StrLen(Text);
  69     else
  70        TextLength = 0;
  71
  72     if (TextLength * FONT_CELL_WIDTH + PosX > CompImage->Width)
  73         TextLength = (CompImage->Width - PosX) / FONT_CELL_WIDTH;
  74
  75     // load the font
  76     if (FontImage == NULL)
  77         FontImage = egPrepareEmbeddedImage(&egemb_font, TRUE);
  78
  79     // render it
  80     BufferPtr = CompImage->PixelData;
  81     BufferLineOffset = CompImage->Width;
  82     BufferPtr += PosX + PosY * BufferLineOffset;
  83     FontPixelData = FontImage->PixelData;
  84     FontLineOffset = FontImage->Width;
  85     for (i = 0; i < TextLength; i++) {
  86         c = Text[i];
  87         if (c < 32 || c >= 127)
  88             c = 95;
  89         else
  90             c -= 32;
  91         egRawCompose(BufferPtr, FontPixelData + c * FONT_CELL_WIDTH,
  92                      FONT_CELL_WIDTH, FONT_CELL_HEIGHT,
  93                      BufferLineOffset, FontLineOffset);
  94         BufferPtr += FONT_CELL_WIDTH;
  95     }
  96 }
  97
  98 /* EOF */