/*

 * Copyright (C) 2006, 2007 Apple Inc.  All rights reserved.

 *

 * Redistribution and use in source and binary forms, with or without

 * modification, are permitted provided that the following conditions

 * are met:

 * 1. Redistributions of source code must retain the above copyright

 *    notice, this list of conditions and the following disclaimer.

 * 2. 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.

 *

 * THIS SOFTWARE IS PROVIDED BY APPLE COMPUTER, INC. ``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 APPLE COMPUTER, INC. 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 "config.h"

#include "Font.h"

#include "FontData.h"

#include "FontFallbackList.h"

#include "GlyphBuffer.h"

#include "GraphicsContext.h"

#include "IntRect.h"

#include "NotImplemented.h"

#include "TextStyle.h"

#include "UniscribeController.h"

#include <ApplicationServices/ApplicationServices.h>

#include <WebKitSystemInterface/WebKitSystemInterface.h>

#include <wtf/MathExtras.h>

namespace WebCore {

const int syntheticObliqueAngle = 14;

void Font::drawGlyphs(GraphicsContext* graphicsContext, const FontData* font, const GlyphBuffer& glyphBuffer, 

                      int from, int numGlyphs, const FloatPoint& point) const

{

    CGContextRef cgContext = graphicsContext->platformContext();

    uint32_t oldFontSmoothingStyle = wkSetFontSmoothingStyle(cgContext);

    const FontPlatformData& platformData = font->platformData();

    //NSFont* drawFont;

    //if ([gContext isDrawingToScreen]) {

    //    drawFont = [platformData.font screenFont];

    //    if (drawFont != platformData.font)

    //        // We are getting this in too many places (3406411); use ERROR so it only prints on debug versions for now. (We should debug this also, eventually).

    //        LOG_ERROR("Attempting to set non-screen font (%@) when drawing to screen.  Using screen font anyway, may result in incorrect metrics.",

    //            [[[platformData.font fontDescriptor] fontAttributes] objectForKey:NSFontNameAttribute]);

    //} else {

    //    drawFont = [platformData.font printerFont];

    //    if (drawFont != platformData.font)

    //        NSLog(@"Attempting to set non-printer font (%@) when printing.  Using printer font anyway, may result in incorrect metrics.",

    //            [[[platformData.font fontDescriptor] fontAttributes] objectForKey:NSFontNameAttribute]);

    //}

    CGContextSetFont(cgContext, platformData.cgFont());

    CGAffineTransform matrix = CGAffineTransformIdentity;

    matrix.b = -matrix.b;

    matrix.d = -matrix.d;

    if (platformData.syntheticOblique())

    {

        static float skew = -tanf(syntheticObliqueAngle * acosf(0) / 90);

        matrix = CGAffineTransformConcat(matrix, CGAffineTransformMake(1, 0, skew, 1, 0, 0));

    }

    // Uniscribe gives us offsets to help refine the positioning of combining glyphs.

    FloatSize translation = glyphBuffer.offsetAt(from);

    if (translation.width() || translation.height())

        CGAffineTransformTranslate(matrix, translation.width(), translation.height());

    CGContextSetTextMatrix(cgContext, matrix);

    //wkSetCGFontRenderingMode(cgContext, drawFont);

    CGContextSetFontSize(cgContext, platformData.size());

    CGContextSetTextPosition(cgContext, point.x(), point.y());

    CGContextShowGlyphsWithAdvances(cgContext, glyphBuffer.glyphs(from), glyphBuffer.advances(from), numGlyphs);

    if (font->m_syntheticBoldOffset) {

        CGContextSetTextPosition(cgContext, point.x() + font->m_syntheticBoldOffset, point.y());

        CGContextShowGlyphsWithAdvances(cgContext, glyphBuffer.glyphs(from), glyphBuffer.advances(from), numGlyphs);

    }

    wkRestoreFontSmoothingStyle(cgContext, oldFontSmoothingStyle);

}

FloatRect Font::selectionRectForComplexText(const TextRun& run, const TextStyle& style, const IntPoint& point, int h,

                                            int from, int to) const

{

    UniscribeController it(this, run, style);

    it.advance(from);

    float beforeWidth = it.runWidthSoFar();

    it.advance(to);

    float afterWidth = it.runWidthSoFar();

    // Using roundf() rather than ceilf() for the right edge as a compromise to ensure correct caret positioning

    if (style.rtl()) {

        it.advance(run.length());

        float totalWidth = it.runWidthSoFar();

        return FloatRect(point.x() + floorf(totalWidth - afterWidth), point.y(), roundf(totalWidth - beforeWidth) - floorf(totalWidth - afterWidth), h);

    } 

    return FloatRect(point.x() + floorf(beforeWidth), point.y(), roundf(afterWidth) - floorf(beforeWidth), h);

}

void Font::drawComplexText(GraphicsContext* context, const TextRun& run, const TextStyle& style, const FloatPoint& point,

                           int from, int to) const

{

    // This glyph buffer holds our glyphs + advances + font data for each glyph.

    GlyphBuffer glyphBuffer;

    float startX = point.x();

    UniscribeController controller(this, run, style);

    controller.advance(from);

    float beforeWidth = controller.runWidthSoFar();

    controller.advance(to, &glyphBuffer);

    // We couldn't generate any glyphs for the run.  Give up.

    if (glyphBuffer.isEmpty())

        return;

    float afterWidth = controller.runWidthSoFar();

    if (style.rtl()) {

        controller.advance(run.length());

        startX += controller.runWidthSoFar() - afterWidth;

    } else

        startX += beforeWidth;

    // Draw the glyph buffer now at the starting point returned in startX.

    FloatPoint startPoint(startX, point.y());

    drawGlyphBuffer(context, glyphBuffer, run, style, startPoint);

}

float Font::floatWidthForComplexText(const TextRun& run, const TextStyle& style) const

{

    UniscribeController controller(this, run, style);

    controller.advance(run.length());

    return controller.runWidthSoFar();

}

int Font::offsetForPositionForComplexText(const TextRun& run, const TextStyle& style, int x, bool includePartialGlyphs) const

{

    UniscribeController controller(this, run, style);

    return controller.offsetForPosition(x, includePartialGlyphs);

}

}