textsvcs.cpp

linux下的一款播放器

/* ***** BEGIN LICENSE BLOCK *****
 * Source last modified: $Id: textsvcs.cpp,v 1.1.2.1 2004/07/09 01:50:49 hubbe Exp $
 * 
 * Portions Copyright (c) 1995-2004 RealNetworks, Inc. All Rights Reserved.
 * 
 * The contents of this file, and the files included with this file,
 * are subject to the current version of the RealNetworks Public
 * Source License (the "RPSL") available at
 * http://www.helixcommunity.org/content/rpsl unless you have licensed
 * the file under the current version of the RealNetworks Community
 * Source License (the "RCSL") available at
 * http://www.helixcommunity.org/content/rcsl, in which case the RCSL
 * will apply. You may also obtain the license terms directly from
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 * to this file, the RCSL.  Please see the applicable RPSL or RCSL for
 * the rights, obligations and limitations governing use of the
 * contents of the file.
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 * terms of the GNU General Public License Version 2 or later (the
 * "GPL") in which case the provisions of the GPL are applicable
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 * use your version of this file under the terms of any one of the
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 * 
 * This file is part of the Helix DNA Technology. RealNetworks is the
 * developer of the Original Code and owns the copyrights in the
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 * This file, and the files included with this file, is distributed
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 * Technology Compatibility Kit Test Suite(s) Location:
 *    http://www.helixcommunity.org/content/tck
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 * Contributor(s):
 * 
 * ***** END LICENSE BLOCK ***** */

 
 /****************************************************************************
 *
 *  Text Services for rendering text onto a bitmap
 *
 */

#include "hxtypes.h" /*Must be included before windows.h for VC6 compiler*/

#ifdef _WINDOWS
#include <windows.h>
#endif

#include "stdlib.h"

#include "hxassert.h"
#include "hxstring.h"

#include "textsvcs.h"

#define LOW_BIT_MONOCHROME  0
#define HIGH_BIT_MONOCHROME (LOW_BIT_MONOCHROME+7)

HX_RESULT
CTextServices::bltToBitmapFromBitmap(UCHAR* pOffscreenBitmap,
	LONG32 lOffscreenWidth, LONG32 lOffscreenHeight, LONG32 lOffscreenDepth,
	INT32 lPosX, INT32 lPosY, FT_Bitmap* pFTGlyphBitmap,
	UINT32 ulARGBforegroundColor)
{
    HX_RESULT hxrslt = HXR_OK;
    UINT8 uBitNumForMonochrome = HIGH_BIT_MONOCHROME;
    UCHAR* p8SrcBits = NULL;

    // /XXXEH- bRowsInverted is TRUE for Windows. FALSE for others???
#if defined(_WINDOWS)
    BOOL bRowsInverted = TRUE;
#else
    BOOL bRowsInverted = FALSE;
#endif
    
    LONG32 lGlyphHeight = (LONG32)pFTGlyphBitmap->rows;
    LONG32 lGlyphWidth = (LONG32)pFTGlyphBitmap->width;

    LONG32 lWBoundsChecked =
	    lGlyphWidth+lPosX < lOffscreenWidth? lGlyphWidth+lPosX : lOffscreenWidth-1;

    INT32 lDestRow = lPosY;
    INT32 lSrcRow = 0;

    INT32 lNumPixelsPer32Bits = 4;

    // /XXXEH- need to handle non-32-bit destination-bitmap depths:
    if (32 != lOffscreenDepth)
    {
	HX_ASSERT(32 == lOffscreenDepth  &&  "need_to_handle_other_bit-depths");
	hxrslt = HXR_FAIL;
	goto cleanup;
    }

    if (ft_pixel_mode_grays == pFTGlyphBitmap->pixel_mode)
    {
	HX_ASSERT(256 == pFTGlyphBitmap->num_grays);
	lNumPixelsPer32Bits = 4;
    }
    else // /ft_pixel_mode_mono -- monochrome bitmap:
    {
	HX_ASSERT(ft_pixel_mode_mono == pFTGlyphBitmap->pixel_mode);
	lNumPixelsPer32Bits = 32;
    }

    if (4 != lNumPixelsPer32Bits  &&  32 != lNumPixelsPer32Bits)
    {
	// /We can't handle other than either 1 or 256 levels from the source
	// glyph bitmap.  FreeType 2 doesn't allow for anything else, anyway,
	// but just in case that changes in the future...
	HX_ASSERT(4 == lNumPixelsPer32Bits  ||  32 == lNumPixelsPer32Bits);
	hxrslt = HXR_FAIL;
	goto cleanup;
    }

    /* /XXXEH- the FT_Bitmap struct:
    typedef struct  FT_Bitmap_
    {
	int             rows;
	int             width;
	int             pitch;
	unsigned char*  buffer;
	short           num_grays;
	char            pixel_mode;
	char            palette_mode;
	void*           palette;

    } FT_Bitmap;
    */

    p8SrcBits = (UCHAR*)pFTGlyphBitmap->buffer;

    // /Go through and copy bits from the glyph bitmap to the offscreen one:
    for (uBitNumForMonochrome = HIGH_BIT_MONOCHROME, lDestRow = lPosY, lSrcRow = 0;
	    (lDestRow < lPosY + lGlyphHeight)  &&  (lDestRow < lOffscreenHeight)  &&
	    (lSrcRow < lGlyphHeight);
	    lDestRow++, lSrcRow++)
    {
        UINT32* p32DestBits = (UINT32*)pOffscreenBitmap +
		((bRowsInverted ? lOffscreenHeight - 1 - lDestRow : lDestRow) *
                lOffscreenWidth) + lPosX;
	if (32 == lNumPixelsPer32Bits  &&  lDestRow > lPosY)
	{
	    // /This finishes fixing CROSSPLAT-TEXT-BUG-0015:
	    // /Next byte starts the next row, so ignore pad bits:
	    p8SrcBits++;
	    uBitNumForMonochrome = HIGH_BIT_MONOCHROME;
	}
	else
	{
	    p8SrcBits = (UCHAR*)pFTGlyphBitmap->buffer +
		    ((lSrcRow/(lNumPixelsPer32Bits/4)) * lGlyphWidth);
	}

        UINT32 ulDestColNum = (UINT32)lWBoundsChecked;
	UINT32 ulSrcColNum = lGlyphWidth;
        while (ulDestColNum--  &&  ulSrcColNum--)
        {
            UINT8 u8GrayScale = (UINT8)(*p8SrcBits);
	    if (32 == lNumPixelsPer32Bits)
	    {
		// /Use the appropriate bit; this is 1 bit per pixel:
		u8GrayScale = (UINT8)(((*p8SrcBits)>>uBitNumForMonochrome) & 1);
	    }
	    
            if (0xFF <= u8GrayScale  ||
		    (32 == lNumPixelsPer32Bits  &&  u8GrayScale))
            {
		// /Fixes CROSSPLAT-TEXT-BUG-0003 by using foregroundColor
		// instead of grayscale:
                *p32DestBits = ulARGBforegroundColor;
            }
            else if (u8GrayScale)
            {
		// /Fixes CROSSPLAT-TEXT-BUG-0004:
		// /Translate from grayscale to text color: set to gray-
		// adjusted color and also set transparency level to allow
		// background image to blend in.  If background isn't 100%
		// transparent in the original value, then we need to blend
		// the original as well as the new values based on their
		// transparency values:
		if ((*p32DestBits & 0xFF000000) == 0xFF000000)
		{
		    // /100% transparent bkgrnd, so just set alpha:
		    *p32DestBits = ulARGBforegroundColor |
			    // /Set the alpha channel:
			    ((UINT32)(255-u8GrayScale) << 24);
		}
		else
		{
		    // /Break out foreground colors:
		    UINT16 usFGRed   = (ulARGBforegroundColor & 0xFF0000) >> 16;
		    UINT16 usFGGreen = (ulARGBforegroundColor & 0xFF00) >> 8;
		    UINT16 usFGBlue  =  ulARGBforegroundColor & 0xFF;
		    // /Break out background colors:
		    UINT16 usBGRed   = (*p32DestBits & 0xFF0000) >> 16;
		    UINT16 usBGGreen = (*p32DestBits & 0xFF00) >> 8;
		    UINT16 usBGBlue  =  *p32DestBits & 0xFF;

		    float fFGPercentAlpha = 1.0 - ((float)u8GrayScale/255.0);

		    // /If background is 100% opaque, leave alpha alone and 
		    // blend with existing (background) color:
		    if (!(*p32DestBits & 0xFF000000))
		    {
			UINT32 ulBlendedRed = (UINT32)(
				(fFGPercentAlpha * usBGRed) +
				((1.0-fFGPercentAlpha) * usFGRed) ) << 16;
			ulBlendedRed &= 0xFF0000;

			UINT32 ulBlendedGreen = (UINT32)(
				(fFGPercentAlpha * usBGGreen) +
				((1.0-fFGPercentAlpha) * usFGGreen) ) << 8;
			ulBlendedGreen &= 0xFF00;

			UINT32 ulBlendedBlue = (UINT32)(
				(fFGPercentAlpha * usBGBlue) +
				((1.0-fFGPercentAlpha) * usFGBlue) );
			ulBlendedBlue &= 0xFF;

			*p32DestBits = (ulBlendedRed | ulBlendedGreen | ulBlendedBlue);
		    }
		    else // /Blend each, and average their alpha:
		    {
			UINT32 ulBGAlpha = (*p32DestBits & 0xFF000000)>>24;
			float fBGPercentAlpha = (float)ulBGAlpha/255.0;

			float fProductFGAlphaBGAlpha =
				fFGPercentAlpha * fBGPercentAlpha;
			 // /Code above should assure this (see division, below):
			HX_ASSERT(fFGPercentAlpha < 1.0  &&  fProductFGAlphaBGAlpha < 1.0);
			// /This is the scale factor we need to apply so that
			// when the vid-surface blending happens, the values
			// end up where they were supposed to be:
			float fScaleFactorToCounterNextSiteAlphaBlend =
				1.0 / (1.0 - fProductFGAlphaBGAlpha);

			UINT32 ulBlendedRed = (UINT32)( ( ((1.0-fBGPercentAlpha) *
				fFGPercentAlpha * usBGRed) +
				((1.0-fFGPercentAlpha) * usFGRed) ) *
				fScaleFactorToCounterNextSiteAlphaBlend) << 16;
			if (ulBlendedRed > 0xFFFFFF)
			{
			    ulBlendedRed = 0xFF0000;
			}
			ulBlendedRed &= 0xFF0000;

			UINT32 ulBlendedGreen = (UINT32)( ( ((1.0-fBGPercentAlpha) *
				fFGPercentAlpha * usBGGreen) +
				((1.0-fFGPercentAlpha) * usFGGreen) ) *
				fScaleFactorToCounterNextSiteAlphaBlend) << 8;
			if (ulBlendedGreen > 0xFFFF)
			{
			    ulBlendedGreen = 0xFF00;
			}
			ulBlendedGreen &= 0xFF00;

			UINT32 ulBlendedBlue = (UINT32)( ( ((1.0-fBGPercentAlpha) *
				fFGPercentAlpha * usBGBlue) +
				((1.0-fFGPercentAlpha) * usFGBlue) ) *
				fScaleFactorToCounterNextSiteAlphaBlend);
			if (ulBlendedBlue > 0xFF)
			{
			    ulBlendedBlue = 0xFF;
			}
			ulBlendedBlue &= 0xFF;

			UINT32 ulNewAlpha = (UINT32)(255*fProductFGAlphaBGAlpha) << 24;
			*p32DestBits = (ulBlendedRed | ulBlendedGreen | ulBlendedBlue) |
				// /Set the alpha channel to the average of the
				// current bg alpha and the gray scale (right
				// shifting by 23 is the same as dividing by 2
				// and then << by 24):
				ulNewAlpha;
		    }
		}
            }
	    else // /0
	    {
		; // /XXXEH- finish this!  Fill in bgrect if font bgcolor set.
	    }
            p32DestBits++;

	    if (32 == lNumPixelsPer32Bits)
	    {
		if (LOW_BIT_MONOCHROME == uBitNumForMonochrome)
		{
		    uBitNumForMonochrome = HIGH_BIT_MONOCHROME;
		    // /Increment src ptr after every 8 bits:
		    p8SrcBits++;
		}
		else
		{
		    uBitNumForMonochrome--;
		}
	    }
	    else
	    {
		p8SrcBits++;
	    }
        }
    }

cleanup:
    return hxrslt;
}

HX_RESULT
CTextServices::renderTextSameFontFace(const char* pszString, UCHAR* pOffscreenBitmap,
			LONG32 lOffscreenWidth, LONG32 lOffscreenHeight,
			LONG32 lOffscreenDepth,
			INT32 lPosStartX, INT32 lPosStartY,
			BOOL bDoAntialias,
			FT_Encoding ftCharsetEncoding,
			UINT32 ulAvgCharWidthPixels /*0 to default*/,
			UINT32 ulCharHeightPixels,
			UINT32 ulARGBforegroundColor)
{
    return renderText(pszString, pOffscreenBitmap,
	    lOffscreenWidth, lOffscreenHeight, lOffscreenDepth,
	    lPosStartX, lPosStartY, bDoAntialias, ftCharsetEncoding,
	    USE_SAME_FAMILY_AS_PRIOR_CALL,
	    USE_SAME_BOLD_AS_PRIOR_CALL,
	    USE_SAME_ITALICS_AS_PRIOR_CALL,
	    ulAvgCharWidthPixels /*0 to default*/, ulCharHeightPixels,
	    ulARGBforegroundColor);
}

HX_RESULT
CTextServices::renderText(const char* pszString, UCHAR* pOffscreenBitmap,
			LONG32 lOffscreenWidth, LONG32 lOffscreenHeight,
			LONG32 lOffscreenDepth,
			INT32 lPosStartX, INT32 lPosStartY,
			BOOL bDoAntialias,
			FT_Encoding ftCharsetEncoding,
			const char* pszFontFamily, // /NULL means use prior face
			BOOL bIsBold, // /-ignored if pszFontFamily==NULL
			BOOL bIsItalicized, // /-ignored if pszFontFamily==NULL
			UINT32 ulAvgCharWidthPixels /*0 to default*/,
			UINT32 ulCharHeightPixels,
			UINT32 ulARGBforegroundColor)
{
    HX_RESULT hxrslt = HXR_OK;

    FT_ULong ulCharCode = 0;
    FT_UInt ulGlyphIndex = 0;
    FT_CharMap  ftFound = 0;
    FT_CharMap  ftCharmap = NULL;

    FT_Error ftError;

    INT32 lCurPenX = lPosStartX;
    INT32 lCurPenY = lPosStartY;

    INT32 lIndx = 0;

    FT_Render_Mode ftRenderMode = bDoAntialias ? ft_render_mode_normal
						: ft_render_mode_mono;

    // /XXXEH- use mbtrlen() if encoding is DBCS or use wcslen() for UNICODE:
    INT32 lStringlen = pszString? strlen(pszString):0;

    HX_ASSERT(NULL == USE_SAME_FAMILY_AS_PRIOR_CALL);
    // /If pszFontFamily is NULL, that means just re-use prior one which is
    // loaded in m_hFace.  If m_hFace is NULL, too, then there's a problem:
    if (!pszFontFamily  &&  !m_hFace)
    {
	HX_ASSERT(pszFontFamily  || m_hFace);
	hxrslt = HXR_INVALID_PARAMETER;
	goto cleanup;
    }

    if (!pszString  ||  !pOffscreenBitmap)
    {
	HX_ASSERT(pszString  &&  pOffscreenBitmap);
	hxrslt = HXR_INVALID_PARAMETER;
	goto cleanup;
    }

    if (!m_hLibrary)
    {
	ftError = FT_Init_FreeType(&m_hLibrary);
	if (ftError  ||  !m_hLibrary)
	{
	    hxrslt = HXR_FAIL;
	    goto cleanup;
	}
    }

    if (USE_SAME_FAMILY_AS_PRIOR_CALL != pszFontFamily)
    {
	if (m_hFace)