1 /*

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

     3  *

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

     5  * modification, are permitted provided that the following conditions

     6  * are met:

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

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

     9  * 2. Redistributions in binary form must reproduce the above copyright

    10  *    notice, this list of conditions and the following disclaimer in the

    11  *    documentation and/or other materials provided with the distribution.

    12  *

    13  * THIS SOFTWARE IS PROVIDED BY APPLE COMPUTER, INC. ``AS IS'' AND ANY

    14  * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE

    15  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR

    16  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL APPLE COMPUTER, INC. OR

    17  * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,

    18  * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,

    19  * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR

    20  * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY

    21  * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT

    22  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE

    23  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 

    24  */

    25 

    26 #include "config.h"

    27 #include "WebKitGraphics.h"

    28 

    29 #include "WebKit.h"

    30 #include "WebKitDLL.h"

    31 

    32 #pragma warning(push, 0)

    33 #include <WebCore/CharacterNames.h>

    34 #include <WebCore/Font.h>

    35 #include <WebCore/FontDescription.h>

    36 #include <WebCore/GraphicsContext.h>

    37 #include <WebCore/PlatformString.h>

    38 #include <WebCore/StringTruncator.h>

    39 #include <WebCore/WebCoreTextRenderer.h>

    40 

    41 #include <CoreGraphics/CoreGraphics.h>

    42 #pragma warning(pop)

    43 

    44 #include <WebKitSystemInterface/WebKitSystemInterface.h>

    45 

    46 using namespace WebCore;

    47 

    48 static Font makeFont(const WebFontDescription& description)

    49 {

    50     AtomicString::init();

    51 

    52     String fontFamilyString(description.family, description.familyLength);

    53 

    54     FontDescription f;

    55     FontFamily family;

    56     family.setFamily(fontFamilyString);

    57     f.setFamily(family);

    58     f.setSpecifiedSize(description.size);

    59     f.setComputedSize(description.size);

    60     f.setItalic(description.italic);

    61     f.setBold(description.bold);

    62     f.setIsAbsoluteSize(true);

    63 

    64     Font font(f, 0, 0);

    65     font.update();

    66 

    67     return font;

    68 }

    69 

    70 void DrawTextAtPoint(CGContextRef cgContext, LPCTSTR text, int length, POINT point, const WebFontDescription& description, CGColorRef color, int underlinedIndex, bool drawAsPassword)

    71 {

    72     GraphicsContext context(cgContext);

    73 

    74     ASSERT(CGColorGetNumberOfComponents(color) == 4);   // this code assumes the CGColorRef has 4 components

    75     const CGFloat* components = CGColorGetComponents(color);

    76     Color textColor((int)(components[0] * 255), (int)(components[1] * 255), (int)(components[2] * 255), (int)(components[3] * 255));

    77 

    78     String drawString(text, length);

    79     if (drawAsPassword)

    80         drawString = drawString.impl()->secure(WebCore::bullet);

    81     WebCoreDrawTextAtPoint(context, drawString, point, makeFont(description), textColor, underlinedIndex);

    82 }

    83 

    84 void WebDrawText(WebTextRenderInfo* info)

    85 {

    86     if (!info || info->structSize != sizeof(WebTextRenderInfo) || !info->cgContext || !info->description)

    87         return;

    88 

    89     int oldFontSmoothingLevel = -1;

    90     if (info->overrideSmoothingLevel >= 0) {

    91         oldFontSmoothingLevel = wkGetFontSmoothingLevel();

    92         wkSetFontSmoothingLevel(info->overrideSmoothingLevel);

    93     }

    94 

    95     DrawTextAtPoint(info->cgContext, info->text, info->length, info->pt, *(info->description), info->color, info->underlinedIndex, info->drawAsPassword);

    96 

    97     if (info->overrideSmoothingLevel >= 0)

    98         wkSetFontSmoothingLevel(oldFontSmoothingLevel);

    99 }

   100 

   101 float TextFloatWidth(LPCTSTR text, int length, const WebFontDescription& description)

   102 {

   103     return WebCoreTextFloatWidth(String(text, length), makeFont(description));

   104 }

   105 

   106 void FontMetrics(const WebFontDescription& description, int* ascent, int* descent, int* lineSpacing)

   107 {

   108     if (!ascent && !descent && !lineSpacing)

   109         return;

   110 

   111     Font font(makeFont(description));

   112 

   113     if (ascent)

   114         *ascent = font.ascent();

   115 

   116     if (descent)

   117         *descent = font.descent();

   118 

   119     if (lineSpacing)

   120         *lineSpacing = font.lineSpacing();

   121 }

   122 

   123 void CenterTruncateStringToWidth(LPCTSTR text, int length, const WebFontDescription& description, float width, WCHAR* buffer)

   124 {

   125     ASSERT(buffer);

   126 

   127     String result = StringTruncator::centerTruncate(String(text, length), width, makeFont(description), false);

   128     memcpy(buffer, result.characters(), result.length() * sizeof(UChar));

   129     buffer[result.length()] = '\0';

   130 }

   131 

   132 void RightTruncateStringToWidth(LPCTSTR text, int length, const WebFontDescription& description, float width, WCHAR* buffer)

   133 {

   134     ASSERT(buffer);

   135 

   136     String result = StringTruncator::rightTruncate(String(text, length), width, makeFont(description), false);

   137     memcpy(buffer, result.characters(), result.length() * sizeof(UChar));

   138     buffer[result.length()] = '\0';

   139 }