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/*
* libeg/text.c
* Text drawing functions
*
* Copyright (c) 2006 Christoph Pfisterer
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are
* met:
*
* * Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
*
* * Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the
* distribution.
*
* * Neither the name of Christoph Pfisterer nor the names of the
* contributors may be used to endorse or promote products derived
* from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#include "libegint.h"
#include "egemb_font.h"
#define FONT_CELL_WIDTH (7)
#define FONT_CELL_HEIGHT (12)
static EG_IMAGE *FontImage = NULL;
//
// Text rendering
//
VOID egMeasureText(IN CHAR16 *Text, OUT UINTN *Width, OUT UINTN *Height)
{
if (Width != NULL)
*Width = StrLen(Text) * FONT_CELL_WIDTH;
if (Height != NULL)
*Height = FONT_CELL_HEIGHT;
}
VOID egRenderText(IN CHAR16 *Text, IN OUT EG_IMAGE *CompImage, IN UINTN PosX, IN UINTN PosY)
{
EG_PIXEL *BufferPtr;
EG_PIXEL *FontPixelData;
UINTN BufferLineOffset, FontLineOffset;
UINTN TextLength;
UINTN i, c;
// clip the text
TextLength = StrLen(Text);
if (TextLength * FONT_CELL_WIDTH + PosX > CompImage->Width)
TextLength = (CompImage->Width - PosX) / FONT_CELL_WIDTH;
// load the font
if (FontImage == NULL)
FontImage = egPrepareEmbeddedImage(&egemb_font, TRUE);
// render it
BufferPtr = CompImage->PixelData;
BufferLineOffset = CompImage->Width;
BufferPtr += PosX + PosY * BufferLineOffset;
FontPixelData = FontImage->PixelData;
FontLineOffset = FontImage->Width;
for (i = 0; i < TextLength; i++) {
c = Text[i];
if (c < 32 || c >= 127)
c = 95;
else
c -= 32;
egRawCompose(BufferPtr, FontPixelData + c * FONT_CELL_WIDTH,
FONT_CELL_WIDTH, FONT_CELL_HEIGHT,
BufferLineOffset, FontLineOffset);
BufferPtr += FONT_CELL_WIDTH;
}
}
/* EOF */
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