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/global.h"
  39
  40 #include "egemb_font.h"
  41 #define FONT_NUM_CHARS 96
  42
  43 static EG_IMAGE *BaseFontImage = NULL;
  44 static EG_IMAGE *DarkFontImage = NULL;
  45 static EG_IMAGE *LightFontImage = NULL;
  46
  47 static UINTN FontCellWidth = 7;
  48
  49 //
  50 // Text rendering
  51 //
  52
  53 static VOID egPrepareFont() {
  54    if (BaseFontImage == NULL) {
  55       BaseFontImage = egPrepareEmbeddedImage(&egemb_font, TRUE);
  56    }
  57    if (BaseFontImage != NULL)
  58       FontCellWidth = BaseFontImage->Width / FONT_NUM_CHARS;
  59 } // VOID egPrepareFont();
  60
  61 UINTN egGetFontHeight(VOID) {
  62    egPrepareFont();
  63    return BaseFontImage->Height;
  64 } // UINTN egGetFontHeight()
  65
  66 UINTN egGetFontCellWidth(VOID) {
  67    return FontCellWidth;
  68 }
  69
  70 UINTN egComputeTextWidth(IN CHAR16 *Text) {
  71    UINTN Width = 0;
  72
  73    egPrepareFont();
  74    if (Text != NULL)
  75       Width = FontCellWidth * StrLen(Text);
  76    return Width;
  77 } // UINTN egComputeTextWidth()
  78
  79 VOID egMeasureText(IN CHAR16 *Text, OUT UINTN *Width, OUT UINTN *Height)
  80 {
  81     egPrepareFont();
  82
  83     if (Width != NULL)
  84         *Width = StrLen(Text) * FontCellWidth;
  85     if (Height != NULL)
  86         *Height = BaseFontImage->Height;
  87 }
  88
  89 VOID egRenderText(IN CHAR16 *Text, IN OUT EG_IMAGE *CompImage, IN UINTN PosX, IN UINTN PosY, IN UINT8 BGBrightness)
  90 {
  91     EG_IMAGE        *FontImage;
  92     EG_PIXEL        *BufferPtr;
  93     EG_PIXEL        *FontPixelData;
  94     UINTN           BufferLineOffset, FontLineOffset;
  95     UINTN           TextLength;
  96     UINTN           i, c;
  97
  98     egPrepareFont();
  99
 100     // clip the text
 101     if (Text)
 102        TextLength = StrLen(Text);
 103     else
 104        TextLength = 0;
 105
 106     if (TextLength * FontCellWidth + PosX > CompImage->Width)
 107         TextLength = (CompImage->Width - PosX) / FontCellWidth;
 108
 109     if (BGBrightness < 128) {
 110        if (LightFontImage == NULL) {
 111           LightFontImage = egCopyImage(BaseFontImage);
 112           if (LightFontImage == NULL)
 113              return;
 114           for (i = 0; i < (LightFontImage->Width * LightFontImage->Height); i++) {
 115              LightFontImage->PixelData[i].r = 255 - LightFontImage->PixelData[i].r;
 116              LightFontImage->PixelData[i].g = 255 - LightFontImage->PixelData[i].g;
 117              LightFontImage->PixelData[i].b = 255 - LightFontImage->PixelData[i].b;
 118           } // for
 119        } // if
 120        FontImage = LightFontImage;
 121     } else {
 122        if (DarkFontImage == NULL)
 123           DarkFontImage = egCopyImage(BaseFontImage);
 124        if (DarkFontImage == NULL)
 125           return;
 126        FontImage = DarkFontImage;
 127     } // if/else
 128
 129     // render it
 130     BufferPtr = CompImage->PixelData;
 131     BufferLineOffset = CompImage->Width;
 132     BufferPtr += PosX + PosY * BufferLineOffset;
 133     FontPixelData = FontImage->PixelData;
 134     FontLineOffset = FontImage->Width;
 135     for (i = 0; i < TextLength; i++) {
 136         c = Text[i];
 137         if (c < 32 || c >= 127)
 138             c = 95;
 139         else
 140             c -= 32;
 141         egRawCompose(BufferPtr, FontPixelData + c * FontCellWidth,
 142                      FontCellWidth, FontImage->Height,
 143                      BufferLineOffset, FontLineOffset);
 144         BufferPtr += FontCellWidth;
 145     }
 146 }
 147
 148 // Load a font bitmap from the specified file
 149 VOID egLoadFont(IN CHAR16 *Filename) {
 150    if (BaseFontImage)
 151       egFreeImage(BaseFontImage);
 152
 153    BaseFontImage = egLoadImage(SelfDir, Filename, TRUE);
 154    if (BaseFontImage == NULL)
 155       Print(L"Note: Font image file %s is invalid! Using default font!\n");
 156     egPrepareFont();
 157 } // BOOLEAN egLoadFont()
 158
 159 /* EOF */