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 *BlackFontImage = NULL;
  45 static EG_IMAGE *WhiteFontImage = NULL;
  46
  47 //
  48 // Text rendering
  49 //
  50
  51 VOID egMeasureText(IN CHAR16 *Text, OUT UINTN *Width, OUT UINTN *Height)
  52 {
  53     if (Width != NULL)
  54         *Width = StrLen(Text) * FONT_CELL_WIDTH;
  55     if (Height != NULL)
  56         *Height = FONT_CELL_HEIGHT;
  57 }
  58
  59 VOID egRenderText(IN CHAR16 *Text, IN OUT EG_IMAGE *CompImage, IN UINTN PosX, IN UINTN PosY, IN UINT8 BGBrightness)
  60 {
  61     EG_IMAGE        *FontImage;
  62     EG_PIXEL        *BufferPtr;
  63     EG_PIXEL        *FontPixelData;
  64     UINTN           BufferLineOffset, FontLineOffset;
  65     UINTN           TextLength;
  66     UINTN           i, c;
  67
  68     // clip the text
  69     if (Text)
  70        TextLength = StrLen(Text);
  71     else
  72        TextLength = 0;
  73
  74     if (TextLength * FONT_CELL_WIDTH + PosX > CompImage->Width)
  75         TextLength = (CompImage->Width - PosX) / FONT_CELL_WIDTH;
  76
  77     if (BGBrightness < 128) {
  78        if (WhiteFontImage == NULL) {
  79           WhiteFontImage = egPrepareEmbeddedImage(&egemb_font, TRUE);
  80           if (WhiteFontImage == NULL)
  81              return;
  82           for (i = 0; i < (WhiteFontImage->Width * WhiteFontImage->Height); i++) {
  83              WhiteFontImage->PixelData[i].r = 255 - WhiteFontImage->PixelData[i].r;
  84              WhiteFontImage->PixelData[i].g = 255 - WhiteFontImage->PixelData[i].g;
  85              WhiteFontImage->PixelData[i].b = 255 - WhiteFontImage->PixelData[i].b;
  86 //             WhiteFontImage->PixelData[i].a = 255 - WhiteFontImage->PixelData[i].a;
  87           } // for
  88        } // if
  89        FontImage = WhiteFontImage;
  90     } else {
  91        if (BlackFontImage == NULL)
  92           BlackFontImage = egPrepareEmbeddedImage(&egemb_font, TRUE);
  93        if (BlackFontImage == NULL)
  94           return;
  95        FontImage = BlackFontImage;
  96     } // if/else
  97
  98 //     // load the font
  99 //     if (FontImage == NULL) {
 100 //         FontImage = egPrepareEmbeddedImage(&egemb_font, TRUE);
 101 //     } // if font not yet loaded.
 102
 103     // render it
 104     BufferPtr = CompImage->PixelData;
 105     BufferLineOffset = CompImage->Width;
 106     BufferPtr += PosX + PosY * BufferLineOffset;
 107     FontPixelData = FontImage->PixelData;
 108     FontLineOffset = FontImage->Width;
 109     for (i = 0; i < TextLength; i++) {
 110         c = Text[i];
 111         if (c < 32 || c >= 127)
 112             c = 95;
 113         else
 114             c -= 32;
 115         egRawCompose(BufferPtr, FontPixelData + c * FONT_CELL_WIDTH,
 116                      FONT_CELL_WIDTH, FONT_CELL_HEIGHT,
 117                      BufferLineOffset, FontLineOffset);
 118         BufferPtr += FONT_CELL_WIDTH;
 119     }
 120 }
 121
 122 /* EOF */