patch applied with thanks, fixes #10524

[wxWidgets.git] / src / osx / carbon / utilscocoa.mm

/////////////////////////////////////////////////////////////////////////////
// Name:        src/osx/carbon/utils.mm
// Purpose:     various cocoa mixin utility functions
// Author:      Stefan Csomor
// Modified by:
// Created:     1998-01-01
// RCS-ID:      $Id: utilscocoa.mm 48805 2007-09-19 14:52:25Z SC $
// Copyright:   (c) Stefan Csomor
// Licence:     wxWindows licence
/////////////////////////////////////////////////////////////////////////////

#include "wx/wxprec.h"

#if wxOSX_USE_COCOA_OR_CARBON
#include <Cocoa/Cocoa.h>
#else
#import <UIKit/UIKit.h>
#endif

#ifdef __WXMAC__
#include "wx/osx/private.h"
#endif

#include "wx/fontutil.h"

#if wxOSX_USE_COCOA
#include "wx/cocoa/string.h"
#endif

#ifdef __WXMAC__

#if wxOSX_USE_CARBON
bool wxMacInitCocoa()
{
    bool cocoaLoaded = NSApplicationLoad();
    wxASSERT_MSG(cocoaLoaded,wxT("Couldn't load Cocoa in Carbon Environment")) ;
    return cocoaLoaded;
}
#endif

wxMacAutoreleasePool::wxMacAutoreleasePool()
{
    m_pool = [[NSAutoreleasePool alloc] init];
}

wxMacAutoreleasePool::~wxMacAutoreleasePool()
{
    [(NSAutoreleasePool*)m_pool release];
}

#endif

#if wxOSX_USE_COCOA

CGContextRef wxOSXGetContextFromCurrentContext()
{
    CGContextRef context = (CGContextRef)[[NSGraphicsContext currentContext]
                                          graphicsPort];
    return context;
}

bool wxOSXLockFocus( WXWidget view)
{
    return [view lockFocusIfCanDraw];
}

void wxOSXUnlockFocus( WXWidget view)
{
    [view unlockFocus];
}

#endif

#if wxOSX_USE_IPHONE

CGContextRef wxOSXGetContextFromCurrentContext()
{
    CGContextRef context = UIGraphicsGetCurrentContext();
    return context;
}

#endif

// ----------------------------------------------------------------------------
// NSObject Utils
// ----------------------------------------------------------------------------

void wxMacCocoaRelease( void* obj )
{
    [(NSObject*)obj release];
}

void wxMacCocoaAutorelease( void* obj )
{
    [(NSObject*)obj autorelease];
}

void* wxMacCocoaRetain( void* obj )
{
    [(NSObject*)obj retain];
    return obj;
}

// ----------------------------------------------------------------------------
// NSFont Utils
// ----------------------------------------------------------------------------

#if wxOSX_USE_COCOA
wxFont::wxFont(WX_NSFont nsfont)
{
    [nsfont retain];
    wxNativeFontInfo info;
    SetNativeInfoFromNSFont(nsfont, &info);
    Create(info);
}

void wxFont::SetNativeInfoFromNSFont(WX_NSFont theFont, wxNativeFontInfo* info)
{   
    if ( info->m_faceName.empty())
    {
        //Get more information about the user's chosen font
        NSFontTraitMask theTraits = [[NSFontManager sharedFontManager] traitsOfFont:theFont];
        int theFontWeight = [[NSFontManager sharedFontManager] weightOfFont:theFont];

        wxFontFamily fontFamily = wxFONTFAMILY_DEFAULT;
        //Set the wx font to the appropriate data
        if(theTraits & NSFixedPitchFontMask)
            fontFamily = wxFONTFAMILY_TELETYPE;

        wxFontStyle fontstyle = wxFONTSTYLE_NORMAL;
        wxFontWeight fontweight = wxFONTWEIGHT_NORMAL;
        bool underlined = false;

        int size = (int) ([theFont pointSize]+0.5);
 
        if ( theFontWeight >= 9 )
            fontweight = wxFONTWEIGHT_BOLD ;
        else if ( theFontWeight < 5 )
            fontweight = wxFONTWEIGHT_LIGHT;
        else
            fontweight = wxFONTWEIGHT_NORMAL ;
            
        if ( theTraits & NSItalicFontMask )
            fontstyle = wxFONTSTYLE_ITALIC ;

        info->Init(size,fontFamily,fontstyle,fontweight,underlined,
            wxStringWithNSString([theFont familyName]), wxFONTENCODING_DEFAULT);

    }
}

WX_NSFont wxFont::OSXCreateNSFont(wxOSXSystemFont font, wxNativeFontInfo* info)
{
    NSFont* nsfont = nil;
    switch( font )
    {
        case wxOSX_SYSTEM_FONT_NORMAL:
            nsfont = [NSFont systemFontOfSize:[NSFont systemFontSize]];
            break;
        case wxOSX_SYSTEM_FONT_BOLD:
            nsfont = [NSFont boldSystemFontOfSize:[NSFont systemFontSize]];
            break;
        case wxOSX_SYSTEM_FONT_SMALL:
            nsfont = [NSFont systemFontOfSize:[NSFont smallSystemFontSize]];
            break;
        case wxOSX_SYSTEM_FONT_SMALL_BOLD:
            nsfont = [NSFont boldSystemFontOfSize:[NSFont smallSystemFontSize]];
            break;
        case wxOSX_SYSTEM_FONT_MINI:
            nsfont = [NSFont systemFontOfSize:
                [NSFont systemFontSizeForControlSize:NSMiniControlSize]];
            break;
       case wxOSX_SYSTEM_FONT_MINI_BOLD:
            nsfont = [NSFont boldSystemFontOfSize:
                [NSFont systemFontSizeForControlSize:NSMiniControlSize]];
            break;
        case wxOSX_SYSTEM_FONT_LABELS:
            nsfont = [NSFont labelFontOfSize:[NSFont labelFontSize]];
            break;
       case wxOSX_SYSTEM_FONT_VIEWS:
            nsfont = [NSFont controlContentFontOfSize:0];
            break;
        default:
            break;
    }
    [nsfont retain];
    SetNativeInfoFromNSFont(nsfont, info);
    return nsfont;
}

static inline double DegToRad(double deg) { return (deg * M_PI) / 180.0; }
static const NSAffineTransformStruct kSlantNSTransformStruct = { 1, 0, tan(DegToRad(11)), 1, 0, 0  };

WX_NSFont wxFont::OSXCreateNSFont(const wxNativeFontInfo* info)
{
    NSFont* nsFont;
    int weight = 5;
    NSFontTraitMask traits = 0;
    if (info->m_weight == wxFONTWEIGHT_BOLD)
    {
        traits |= NSBoldFontMask;
        weight = 9;
    }
    else if (info->m_weight == wxFONTWEIGHT_LIGHT)
        weight = 3;

    if (info->m_style == wxFONTSTYLE_ITALIC || info->m_style == wxFONTSTYLE_SLANT)
        traits |= NSItalicFontMask;
    
    nsFont = [[NSFontManager sharedFontManager] fontWithFamily:wxCFStringRef(info->m_faceName).AsNSString() 
        traits:traits weight:weight size:info->m_pointSize];
    
    if ( nsFont == nil )
    {
        NSFontTraitMask remainingTraits = traits;
        nsFont = [[NSFontManager sharedFontManager] fontWithFamily:wxCFStringRef(info->m_faceName).AsNSString() 
                                                            traits:0 weight:5 size:info->m_pointSize];
        if ( nsFont == nil )
        {
            if ( info->m_weight == wxFONTWEIGHT_BOLD )
            {
                nsFont = [NSFont boldSystemFontOfSize:info->m_pointSize];
                remainingTraits &= ~NSBoldFontMask;
            }
            else
                nsFont = [NSFont systemFontOfSize:info->m_pointSize];
        }
        
        // fallback - if in doubt, let go of the bold attribute
        if ( nsFont && (remainingTraits & NSItalicFontMask) )
        {
            NSFont* nsFontWithTraits = nil;
            if ( remainingTraits & NSBoldFontMask)
            {
                nsFontWithTraits = [[NSFontManager sharedFontManager] convertFont:nsFont toHaveTrait:NSBoldFontMask];
                if ( nsFontWithTraits == nil )
                {
                    nsFontWithTraits = [[NSFontManager sharedFontManager] convertFont:nsFont toHaveTrait:NSItalicFontMask];
                    if ( nsFontWithTraits != nil )
                        remainingTraits &= ~NSItalicFontMask;
                }
                else
                {
                    remainingTraits &= ~NSBoldFontMask;
                }
            }
            // the code below causes crashes, because fontDescriptorWithMatrix is not returning a valid font descriptor
            // it adds a NSCTFontMatrixAttribute as well which cannot be disposed of correctly by the autorelease pool
            // so at the moment we have to disable this and cannot synthesize italic fonts if they are not available on the system
#if 0
            if ( remainingTraits & NSItalicFontMask )
            {
                if ( nsFontWithTraits == nil )
                    nsFontWithTraits = nsFont;
                
                NSAffineTransform* transform = [NSAffineTransform transform];
                [transform setTransformStruct:kSlantNSTransformStruct];
                [transform scaleBy:info->m_pointSize];
                NSFontDescriptor* italicDesc = [[nsFontWithTraits fontDescriptor] fontDescriptorWithMatrix:transform];
                if ( italicDesc != nil )
                {
                    NSFont* f = [NSFont fontWithDescriptor:italicDesc size:(CGFloat)(info->m_pointSize)];
                    if ( f != nil )
                        nsFontWithTraits = f;
                }
            }
#endif
            if ( nsFontWithTraits != nil )
                nsFont = nsFontWithTraits;
        }
    }
            
    wxASSERT_MSG(nsFont != nil,wxT("Couldn't create nsFont")) ;
    wxMacCocoaRetain(nsFont);
    return nsFont;
}

#endif

#if wxOSX_USE_IPHONE

WX_UIFont wxFont::OSXCreateUIFont(wxOSXSystemFont font, wxNativeFontInfo* info)
{
    UIFont* uifont;
    switch( font )
    {
        case wxOSX_SYSTEM_FONT_NORMAL:
            uifont = [UIFont systemFontOfSize:[UIFont systemFontSize]];
            break;
        case wxOSX_SYSTEM_FONT_BOLD:
            uifont = [UIFont boldSystemFontOfSize:[UIFont systemFontSize]];
            break;
        case wxOSX_SYSTEM_FONT_MINI:
        case wxOSX_SYSTEM_FONT_SMALL:
            uifont = [UIFont systemFontOfSize:[UIFont smallSystemFontSize]];
            break;
        case wxOSX_SYSTEM_FONT_MINI_BOLD:
        case wxOSX_SYSTEM_FONT_SMALL_BOLD:
            uifont = [UIFont boldSystemFontOfSize:[UIFont smallSystemFontSize]];
            break;
        case wxOSX_SYSTEM_FONT_VIEWS:
        case wxOSX_SYSTEM_FONT_LABELS:
            uifont = [UIFont systemFontOfSize:[UIFont labelFontSize]];
            break;
        default:
            break;
    }
    [uifont retain];
    if ( info->m_faceName.empty())
    {
        wxFontStyle fontstyle = wxFONTSTYLE_NORMAL;
        wxFontWeight fontweight = wxFONTWEIGHT_NORMAL;
        bool underlined = false;

        int size = (int) ([uifont pointSize]+0.5);
        /*
        NSFontSymbolicTraits traits = [desc symbolicTraits];

        if ( traits & NSFontBoldTrait )
            fontweight = wxFONTWEIGHT_BOLD ;
        else
            fontweight = wxFONTWEIGHT_NORMAL ;
        if ( traits & NSFontItalicTrait )
            fontstyle = wxFONTSTYLE_ITALIC ;
        */
        wxCFStringRef fontname( wxCFRetain([uifont familyName]) );
        info->Init(size,wxFONTFAMILY_DEFAULT,fontstyle,fontweight,underlined,
            fontname.AsString(), wxFONTENCODING_DEFAULT);

    }
    return uifont;
}

WX_UIFont wxFont::OSXCreateUIFont(const wxNativeFontInfo* info)
{
    UIFont* uiFont;
    uiFont = [UIFont fontWithName:wxCFStringRef(info->m_faceName).AsNSString() size:info->m_pointSize];
    wxMacCocoaRetain(uiFont);
    return uiFont;
}

#endif
// ----------------------------------------------------------------------------
// NSImage Utils
// ----------------------------------------------------------------------------

#if wxOSX_USE_IPHONE

WX_UIImage  wxOSXGetUIImageFromCGImage( CGImageRef image )
{
    UIImage  *newImage = [UIImage imageWithCGImage:image];
    [newImage autorelease];
    return( newImage );
}

wxBitmap wxOSXCreateSystemBitmap(const wxString& name, const wxString &client, const wxSize& size)
{
#if 0
    // unfortunately this only accesses images in the app bundle, not the system wide globals
    wxCFStringRef cfname(name);
    return wxBitmap( [[UIImage imageNamed:cfname.AsNSString()] CGImage] );
#else
    return wxBitmap();
#endif
}

#endif

#if wxOSX_USE_COCOA

wxBitmap wxOSXCreateSystemBitmap(const wxString& name, const wxString &client, const wxSize& size)
{
    wxCFStringRef cfname(name);
    wxCFRef<CGImageRef> image( wxOSXCreateCGImageFromNSImage([NSImage imageNamed:cfname.AsNSString()]) );
    return wxBitmap( image );
}

//  From "Cocoa Drawing Guide:Working with Images"
WX_NSImage  wxOSXGetNSImageFromCGImage( CGImageRef image )
{
    NSRect      imageRect    = NSMakeRect(0.0, 0.0, 0.0, 0.0);

    // Get the image dimensions.
    imageRect.size.height = CGImageGetHeight(image);
    imageRect.size.width = CGImageGetWidth(image);

    // Create a new image to receive the Quartz image data.
    NSImage  *newImage = [[NSImage alloc] initWithSize:imageRect.size];
    [newImage lockFocus];

    // Get the Quartz context and draw.
    CGContextRef  imageContext = (CGContextRef) [[NSGraphicsContext currentContext] graphicsPort];
    CGContextDrawImage( imageContext, *(CGRect*)&imageRect, image );
    [newImage unlockFocus];

    /*
        // Create a bitmap rep from the image...
        NSBitmapImageRep *bitmapRep = [[NSBitmapImageRep alloc] initWithCGImage:cgImage];
        // Create an NSImage and add the bitmap rep to it...
        NSImage *image = [[NSImage alloc] init];
        [image addRepresentation:bitmapRep];
        [bitmapRep release];
    */
    [newImage autorelease];
    return( newImage );
}

CGImageRef wxOSXCreateCGImageFromNSImage( WX_NSImage nsimage )
{
    // based on http://www.mail-archive.com/cocoa-dev@lists.apple.com/msg18065.html
    
    NSSize imageSize = [nsimage size];
    CGColorSpaceRef genericRGB = CGColorSpaceCreateWithName(kCGColorSpaceGenericRGB); 
    CGContextRef context = CGBitmapContextCreate(NULL, imageSize.width, imageSize.height, 8, 0, genericRGB, kCGImageAlphaPremultipliedFirst); 
    NSGraphicsContext *nsGraphicsContext = [NSGraphicsContext graphicsContextWithGraphicsPort:context flipped:NO];
    [NSGraphicsContext saveGraphicsState];
    [NSGraphicsContext setCurrentContext:nsGraphicsContext];
    [[NSColor whiteColor] setFill];
    NSRectFill(NSMakeRect(0.0, 0.0, imageSize.width, imageSize.height));
    [nsimage drawAtPoint:NSZeroPoint fromRect:NSZeroRect operation:NSCompositeCopy fraction:1.0];
    [NSGraphicsContext setCurrentContext:nsGraphicsContext];
    CGImageRef image = CGBitmapContextCreateImage(context);
    CFRelease(context);
    return image;
 }

// ----------------------------------------------------------------------------
// NSCursor Utils
// ----------------------------------------------------------------------------

// copied from cursor.mm

static NSCursor* wxGetStockCursor( short sIndex )
{
    ClassicCursor* pCursor = &gMacCursors[sIndex];

    //Classic mac cursors are 1bps 16x16 black and white with a
    //identical mask that is 1 for on and 0 for off
    NSImage *theImage = [[NSImage alloc] initWithSize:NSMakeSize(16.0,16.0)];

    //NSCursor takes an NSImage takes a number of Representations - here
    //we need only one for the raw data
    NSBitmapImageRep *theRep = [[NSBitmapImageRep alloc]
        initWithBitmapDataPlanes: NULL  // Tell Cocoa to allocate the planes for us.
        pixelsWide: 16      // All classic cursors are 16x16
        pixelsHigh: 16
        bitsPerSample: 1    // All classic cursors are bitmaps with bitmasks
        samplesPerPixel: 2  // Sample 0:image 1:mask
        hasAlpha: YES       // Identify last sample as a mask
        isPlanar: YES       // Use a separate array for each sample
        colorSpaceName: NSCalibratedWhiteColorSpace // 0.0=black 1.0=white
        bytesPerRow: 2      // Rows in each plane are on 2-byte boundaries (no pad)
        bitsPerPixel: 1];   // same as bitsPerSample since data is planar

    // Ensure that Cocoa allocated 2 and only 2 of the 5 possible planes
    unsigned char *planes[5];
    [theRep getBitmapDataPlanes:planes];
    wxASSERT(planes[0] != NULL);
    wxASSERT(planes[1] != NULL);
    wxASSERT(planes[2] == NULL);
    wxASSERT(planes[3] == NULL);
    wxASSERT(planes[4] == NULL);

    // NOTE1: The Cursor's bits field is white=0 black=1.. thus the bitwise-not
    // Why not use NSCalibratedBlackColorSpace?  Because that reverses the
    // sense of the alpha (mask) plane.
    // NOTE2: The mask data is 0=off 1=on
    // NOTE3: Cocoa asks for "premultiplied" color planes.  Since we have a
    // 1-bit color plane and a 1-bit alpha plane we can just do a bitwise-and
    // on the two.  The original cursor bitmaps have 0 (white actually) for
    // any masked-off pixels.  Therefore every masked-off pixel would be wrong
    // since we bit-flip all of the picture bits.  In practice, Cocoa doesn't
    // seem to care, but we are following the documentation.

    // Fill in the color (black/white) plane
    for(int i=0; i<16; ++i)
    {
        planes[0][2*i  ] = (~pCursor->bits[i] & pCursor->mask[i]) >> 8 & 0xff;
        planes[0][2*i+1] = (~pCursor->bits[i] & pCursor->mask[i]) & 0xff;
    }
    // Fill in the alpha (i.e. mask) plane
    for(int i=0; i<16; ++i)
    {
        planes[1][2*i  ] = pCursor->mask[i] >> 8 & 0xff;
        planes[1][2*i+1] = pCursor->mask[i] & 0xff;
    }

    //add the representation (data) to the image
    [theImage addRepresentation:theRep];

    //create the new cursor
    NSCursor* theCursor =  [[NSCursor alloc]  initWithImage:theImage
                                    hotSpot:NSMakePoint(pCursor->hotspot[1], pCursor->hotspot[0])
                            ];

    //do the usual cleanups
    [theRep release];
    [theImage release];

    //return the new cursor
    return theCursor;
}

WX_NSCursor wxMacCocoaCreateStockCursor( int cursor_type )
{
    WX_NSCursor cursor = nil;
    switch (cursor_type)
    {
    case wxCURSOR_COPY_ARROW:
        cursor = [[NSCursor arrowCursor] retain];
        break;

    case wxCURSOR_WATCH:
    case wxCURSOR_WAIT:
        // should be displayed by the system when things are running
        cursor = [[NSCursor arrowCursor] retain];
        break;

    case wxCURSOR_IBEAM:
        cursor = [[NSCursor IBeamCursor] retain];
        break;

    case wxCURSOR_CROSS:
        cursor = [[NSCursor crosshairCursor] retain];
        break;

    case wxCURSOR_SIZENWSE:
        cursor = wxGetStockCursor(kwxCursorSizeNWSE);
        break;

    case wxCURSOR_SIZENESW:
        cursor = wxGetStockCursor(kwxCursorSizeNESW);
        break;

    case wxCURSOR_SIZEWE:
        cursor = [[NSCursor resizeLeftRightCursor] retain];
        break;

    case wxCURSOR_SIZENS:
        cursor = [[NSCursor resizeUpDownCursor] retain];
        break;

    case wxCURSOR_SIZING:
        cursor = wxGetStockCursor(kwxCursorSize);
        break;

    case wxCURSOR_HAND:
        cursor = [[NSCursor pointingHandCursor] retain];
        break;

    case wxCURSOR_BULLSEYE:
        cursor = wxGetStockCursor(kwxCursorBullseye);
        break;

    case wxCURSOR_PENCIL:
        cursor = wxGetStockCursor(kwxCursorPencil);
        break;

    case wxCURSOR_MAGNIFIER:
        cursor = wxGetStockCursor(kwxCursorMagnifier);
        break;

    case wxCURSOR_NO_ENTRY:
        cursor = wxGetStockCursor(kwxCursorNoEntry);
        break;

    case wxCURSOR_PAINT_BRUSH:
        cursor = wxGetStockCursor(kwxCursorPaintBrush);
        break;

    case wxCURSOR_POINT_LEFT:
        cursor = wxGetStockCursor(kwxCursorPointLeft);
        break;

    case wxCURSOR_POINT_RIGHT:
        cursor = wxGetStockCursor(kwxCursorPointRight);
        break;

    case wxCURSOR_QUESTION_ARROW:
        cursor = wxGetStockCursor(kwxCursorQuestionArrow);
        break;

    case wxCURSOR_BLANK:
        cursor = wxGetStockCursor(kwxCursorBlank);
        break;

    case wxCURSOR_RIGHT_ARROW:
        cursor = wxGetStockCursor(kwxCursorRightArrow);
        break;

    case wxCURSOR_SPRAYCAN:
        cursor = wxGetStockCursor(kwxCursorRoller);
        break;

    case wxCURSOR_OPEN_HAND:
        cursor = [[NSCursor openHandCursor] retain];
        break;

    case wxCURSOR_CLOSED_HAND:
        cursor = [[NSCursor closedHandCursor] retain];
        break;

    case wxCURSOR_CHAR:
    case wxCURSOR_ARROW:
    case wxCURSOR_LEFT_BUTTON:
    case wxCURSOR_RIGHT_BUTTON:
    case wxCURSOR_MIDDLE_BUTTON:
    default:
        cursor = [[NSCursor arrowCursor] retain];
        break;
    }
    return cursor;
}

//  C-based style wrapper routines around NSCursor
WX_NSCursor  wxMacCocoaCreateCursorFromCGImage( CGImageRef cgImageRef, float hotSpotX, float hotSpotY )
{
    static BOOL    firstTime  = YES;

    if ( firstTime )
    {
        //  Must first call [[[NSWindow alloc] init] release] to get the NSWindow machinery set up so that NSCursor can use a window to cache the cursor image
        [[[NSWindow alloc] init] release];
        firstTime = NO;
    }

    NSImage    *nsImage  = wxOSXGetNSImageFromCGImage( cgImageRef );
    NSCursor  *cursor    = [[NSCursor alloc] initWithImage:nsImage hotSpot:NSMakePoint( hotSpotX, hotSpotY )];

    return cursor;
}

void  wxMacCocoaSetCursor( WX_NSCursor cursor )
{
    [cursor set];
}

void  wxMacCocoaHideCursor()
{
    [NSCursor hide];
}

void  wxMacCocoaShowCursor()
{
    [NSCursor unhide];
}

#endif