/*

    File:       atsui.c

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*/

#include "globals.h"

#include "cubic.h"

#include "quadratic.h"

#include "atsui.h"

#define kLeftMargin 50

static ATSUTextLayout                   layout;

static ATSUStyle                        style;

static UniChar                          string[] = { 'H', 'e', 'l', 'l', 'o', ' ', 'W', 'o', 'r', 'l', 'd', '!' };

static UniCharCount                     length = sizeof(string)/sizeof(UniChar);

static Fixed                            size;

static ATSUFontID                       font;

// Sets the font

//

void SetATSUIStuffFont(ATSUFontID inFont)

{

    font = inFont;

}

// Sets the font size

//

void SetATSUIStuffFontSize(Fixed inSize)

{

    size = inSize;

}

// Updates the ATSUI style to the current font and size

//

void UpdateATSUIStyle(void)

{

    ATSUAttributeTag                    tags[3];

    ByteCount                           sizes[3];

    ATSUAttributeValuePtr               values[3];

    tags[0] = kATSUFontTag;

    sizes[0] = sizeof(ATSUFontID);

    values[0] = &font;

    tags[1] = kATSUSizeTag;

    sizes[1] = sizeof(Fixed);

    values[1] = &size;

    verify_noerr( ATSUSetAttributes(style, 2, tags, sizes, values) );

}

// Creates the ATSUI data

//

void SetUpATSUIStuff(void)

{

    verify_noerr( ATSUCreateStyle(&style) );

    UpdateATSUIStyle();

    verify_noerr( ATSUCreateTextLayoutWithTextPtr(string, kATSUFromTextBeginning, kATSUToTextEnd, length, 1, &length, &style, &layout) );

}

// Draws the current ATSUI data.  Takes a GrafPtr as an argument so

// that it can handle printing as well as drawing into a window.

//

void DrawATSUIStuff(GrafPtr drawingPort)

{

    GrafPtr                             savedPort;

    Rect                                portBounds;

    Fixed                               penX, penY;

    float                               spacer, height;

    ATSCurveType                        curveType;

    ATSUAttributeTag                    tags[2];

    ByteCount                           sizes[2];

    ATSUAttributeValuePtr               values[2];

    // Set up the GrafPort

    GetPort(&savedPort);

    SetPort(drawingPort);

    GetPortBounds(drawingPort, &portBounds);

    EraseRect(&portBounds);

    // If CG mode, set it up

    if ( gUseCG ) {

        if (gNewCG) QDBeginCGContext(drawingPort, &gContext); else CreateCGContextForPort(drawingPort, &gContext);

        tags[0] = kATSUCGContextTag;

        sizes[0] = sizeof(CGContextRef);

        values[0] = &gContext;

        verify_noerr( ATSUSetLayoutControls(layout, 1, tags, sizes, values) );

    }

    else {

        // This is a workaround for older systems in which ATSUClearLayoutControls wasn't working

        // for kATSUCGContextTag sometimes.  If your app doesn't need to run on 10.1.x or earlier

        // systems, don't bother doing this.

        gContext = NULL;

        tags[0] = kATSUCGContextTag;

        sizes[0] = sizeof(CGContextRef);

        values[0] = &gContext;

        verify_noerr( ATSUSetLayoutControls(layout, 1, tags, sizes, values) );

        // Clear the CGContext

        tags[0] = kATSUCGContextTag;

        verify_noerr( ATSUClearLayoutControls(layout, 1, tags) );

    }

    // Figure out the spacing

    height = portBounds.bottom - portBounds.top;

    spacer = height / 4.0;

    penX = Long2Fix(kLeftMargin);

    penY = Long2Fix(0);

    // Regular ATSUDrawText

    penY += X2Fix(spacer);

    verify_noerr( ATSUDrawText(layout, kATSUFromTextBeginning, kATSUToTextEnd, penX, ((gUseCG) ? X2Fix(height) - penY : penY)) );

    // Cubics

    penY += X2Fix(spacer);

    DrawCubics(layout, style, kATSUFromTextBeginning, kATSUToTextEnd, penX, penY, height);

    // Quadratics

    penY += X2Fix(spacer);

    DrawQuadratics(layout, style, kATSUFromTextBeginning, kATSUToTextEnd, penX, penY, height);

    // Output the native curve type

    if ( gOutputCurveType ) {

        verify_noerr( ATSUGetNativeCurveType(style, &curveType) );

        switch( curveType ) {

            case kATSCubicCurveType: fprintf(stdout, "ATSUGetNativeCurveType returned kATSCubicCurveType\n"); break;

            case kATSQuadCurveType:  fprintf(stdout, "ATSUGetNativeCurveType returned kATSQuadCurveType\n"); break;

            case kATSOtherCurveType: fprintf(stdout, "ATSUGetNativeCurveType returned kATSOtherCurveType\n"); break;

        }

        fflush(stdout);

    }

    // If CG mode, tear it down

    if ( gUseCG ) {

        if (gNewCG) QDEndCGContext(drawingPort, &gContext); else CGContextRelease(gContext);    

    }

    // Restore the GrafPort

    SetPort(savedPort);

}

// Draws the glyphs in the layout as Cubics

//

void DrawCubics(ATSUTextLayout iLayout, ATSUStyle iStyle, UniCharArrayOffset start, UniCharCount length, Fixed penX, Fixed penY, float windowHeight)

{

    MyGlyphRecord                       *glyphRecordArray;

    ItemCount                           numGlyphs;

    ATSCubicMoveToUPP                   moveToProc;

    ATSCubicLineToUPP                   lineToProc;

    ATSCubicCurveToUPP                  curveToProc;

    ATSCubicClosePathUPP                closePathProc;

    MyCurveCallbackData                 data;

    OSStatus                            status;

    int                                 i;

    // Create the Cubic callbacks

    moveToProc = NewATSCubicMoveToUPP(MyCubicMoveToProc);

    lineToProc = NewATSCubicLineToUPP(MyCubicLineToProc);

    curveToProc = NewATSCubicCurveToUPP(MyCubicCurveToProc);

    closePathProc = NewATSCubicClosePathUPP(MyCubicClosePathProc);

    // Get the array of glyph information

    GetGlyphIDsAndPositions(iLayout, start, length, &glyphRecordArray, &numGlyphs);

    // Begin a CG path for the outlines and set the stroke color to blue

    if (gUseCG) CGContextSetRGBStrokeColor(gContext, 0.0, 0.0, 1.0, 1.0); else ForeColor(blueColor);

    if (gUseCG) CGContextBeginPath(gContext);

    // Loop over all the glyphs

    data.windowHeight = windowHeight; // Needed for flipping the y-coordinate between CG and QD space

    for (i=0; i < numGlyphs; i++) {

        // Set up the absolute origin of the glyph

        data.origin.x = Fix2X(penX) + glyphRecordArray[i].relativeOrigin.x;

        data.origin.y = Fix2X(penY) + glyphRecordArray[i].relativeOrigin.y;

        // Don't bother with this flag, the cubic callbacks ignore it

        //data.first = true;

        // If this is a deleted glyph (-1), don't draw it.  Otherwise, go ahead.

        if ( glyphRecordArray[i].glyphID != kATSDeletedGlyphcode ) {

            verify_noerr( ATSUGlyphGetCubicPaths(iStyle, glyphRecordArray[i].glyphID, moveToProc, lineToProc, curveToProc, closePathProc, &data, &status) );

        }

    }

    // Stroke the outlines and restore the stroke color to black

    if (gUseCG) {

        CGContextClosePath(gContext);

        CGContextDrawPath(gContext, kCGPathStroke);

        CGContextSetRGBStrokeColor(gContext, 0.0, 0.0, 0.0, 1.0);

    } else {

        ForeColor(blackColor);

    }

    // Free the array of glyph information

    free(glyphRecordArray);

    // Dispose of the Cubic callbacks

    DisposeATSCubicMoveToUPP(moveToProc);

    DisposeATSCubicLineToUPP(lineToProc);

    DisposeATSCubicCurveToUPP(curveToProc);

    DisposeATSCubicClosePathUPP(closePathProc);

}

// Draws the glyphs in the layout as Quadratics

//

void DrawQuadratics(ATSUTextLayout iLayout, ATSUStyle iStyle, UniCharArrayOffset start, UniCharCount length, Fixed penX, Fixed penY, float windowHeight)

{

    MyGlyphRecord                       *glyphRecordArray;

    ItemCount                           numGlyphs;

    ATSQuadraticNewPathUPP              newPathProc;

    ATSQuadraticLineUPP                 lineProc;

    ATSQuadraticCurveUPP                curveProc;

    ATSQuadraticClosePathUPP            closePathProc;

    MyCurveCallbackData                 data;

    OSStatus                            status;

    int                                 i;

    // Create the Quadratic callbacks

    newPathProc = NewATSQuadraticNewPathUPP(MyQuadraticNewPathProc);

    lineProc = NewATSQuadraticLineUPP(MyQuadraticLineProc);

    curveProc = NewATSQuadraticCurveUPP(MyQuadraticCurveProc);

    closePathProc = NewATSQuadraticClosePathUPP(MyQuadraticClosePathProc);

    // Get the array of glyph information

    GetGlyphIDsAndPositions(iLayout, start, length, &glyphRecordArray, &numGlyphs);

    // Begin a CG path for the outlines and set the stroke color to red

    if (gUseCG) CGContextSetRGBStrokeColor(gContext, 1.0, 0.0, 0.0, 1.0); else ForeColor(redColor);

    if (gUseCG) CGContextBeginPath(gContext);

    // Loop over all the glyphs

    data.windowHeight = windowHeight; // Needed for flipping the y-coordinate between CG and QD space

    for (i=0; i < numGlyphs; i++) {

        // Set up the absolute origin of the glyph

        data.origin.x = Fix2X(penX) + glyphRecordArray[i].relativeOrigin.x;

        data.origin.y = Fix2X(penY) + glyphRecordArray[i].relativeOrigin.y;

        // Reset state for quadratic drawing (the callbacks only do a MoveTo on the very first segment)

        data.first = true;

        // If this is a deleted glyph (-1), don't draw it.  Otherwise, go ahead.

        if ( glyphRecordArray[i].glyphID != kATSDeletedGlyphcode ) {

            verify_noerr( ATSUGlyphGetQuadraticPaths(iStyle, glyphRecordArray[i].glyphID, newPathProc, lineProc, curveProc, closePathProc, &data, &status) );

        }

    }

    // Stroke the outlines and restore the stroke color to black

    if (gUseCG) {

        CGContextClosePath(gContext);

        CGContextDrawPath(gContext, kCGPathStroke);

        CGContextSetRGBStrokeColor(gContext, 0.0, 0.0, 0.0, 1.0);

    } else {

        ForeColor(blackColor);

    }

    // Free the array of glyph information

    free(glyphRecordArray);

    // Dispose of the Quadratic callbacks

    DisposeATSQuadraticNewPathUPP(newPathProc);

    DisposeATSQuadraticLineUPP(lineProc);

    DisposeATSQuadraticCurveUPP(curveProc);

    DisposeATSQuadraticClosePathUPP(closePathProc);

}

// Creates an array of MyGlyphRecord structs (see atsui.h) for the given range of text in the given layout.

// Caller is responsible for freeing the array.

//

void GetGlyphIDsAndPositions(ATSUTextLayout iLayout, UniCharArrayOffset iStart, UniCharCount iLength, MyGlyphRecord **oGlyphRecordArray, ItemCount *oNumGlyphs)

{

    // This block of code uses the new Direct Access APIs, which are only available on Mac OS X 10.2 and later systems

    //

    if ( gHaveDirectAccess ) {

        ATSLayoutRecord                     *layoutRecords;

        ItemCount                           numRecords;

        Fixed                               *deltaYs;

        ItemCount                           numDeltaYs;

        int                                 i;

        // Get the arrays of glyph information

        verify_noerr( ATSUDirectGetLayoutDataArrayPtrFromTextLayout(iLayout, iStart, kATSUDirectDataLayoutRecordATSLayoutRecordCurrent, (void *)&layoutRecords, &numRecords) );

        verify_noerr( ATSUDirectGetLayoutDataArrayPtrFromTextLayout(iLayout, iStart, kATSUDirectDataBaselineDeltaFixedArray, (void *)&deltaYs, &numDeltaYs) );

        // Build the array of MyGlyphRecords

        *oGlyphRecordArray = (MyGlyphRecord *)malloc(numRecords * sizeof(MyGlyphRecord));

        *oNumGlyphs = numRecords;

        for (i=0; i < *oNumGlyphs; i++) {

            // Fill in the glyphID

            (*oGlyphRecordArray)[i].glyphID = layoutRecords[i].glyphID;

            // Set up the relative origin of the glyph

            //

            // The real position is the x coordinate of the glyph, relative to the beginning of the line

            // The baseline delta (deltaY), if any, is the y coordinate of the glyph, relative to the baseline

            //

            (*oGlyphRecordArray)[i].relativeOrigin.x = Fix2X(layoutRecords[i].realPos);

            if ( deltaYs == NULL ) {

                (*oGlyphRecordArray)[i].relativeOrigin.y = 0.0;

            } else {

                (*oGlyphRecordArray)[i].relativeOrigin.y = 0.0 - Fix2X(deltaYs[i]);

            }

        }        

        // Free the arrays of glyph information

        if ( deltaYs != NULL ) verify_noerr( ATSUDirectReleaseLayoutDataArrayPtr(NULL, kATSUDirectDataBaselineDeltaFixedArray, (void *)&deltaYs) );

        verify_noerr( ATSUDirectReleaseLayoutDataArrayPtr(NULL, kATSUDirectDataLayoutRecordATSLayoutRecordCurrent, (void *)&layoutRecords) );

    }

    // This block of code uses the older GlyphInfoArray APIs, which are available on all Mac OS X systems

    // (These are no longer recommended, in favor of the new Direct Acess APIs)

    else {

        ATSUGlyphInfoArray                  *theGlyphInfoArrayPtr;

        ByteCount                           theArraySize;

        int                                 i;

        // Get the GlyphInfoArray

        verify_noerr( ATSUGetGlyphInfo(iLayout, iStart, iLength, &theArraySize, NULL) );

        theGlyphInfoArrayPtr = (ATSUGlyphInfoArray *) malloc(theArraySize + sizeof(ItemCount) + sizeof(ATSUTextLayout));

        verify_noerr( ATSUGetGlyphInfo(iLayout, iStart, iLength, &theArraySize, theGlyphInfoArrayPtr) );

        // Build the array of MyGlyphRecords

        *oGlyphRecordArray = (MyGlyphRecord *)malloc(theGlyphInfoArrayPtr->numGlyphs * sizeof(MyGlyphRecord));

        *oNumGlyphs = theGlyphInfoArrayPtr->numGlyphs;

        for (i=0; i < *oNumGlyphs; i++) {

            // Fill in the glyphID

            (*oGlyphRecordArray)[i].glyphID = theGlyphInfoArrayPtr->glyphs[i].glyphID;

            // Set up the relative origin of the glyph

            //

            // The ideal position is the x coordinate of the glyph, relative to the beginning of the line

            // The deltaY is the y coordinate of the glyph, relative to the baseline

            //

            (*oGlyphRecordArray)[i].relativeOrigin.x = theGlyphInfoArrayPtr->glyphs[i].idealX;      // These older APIs return float values

            (*oGlyphRecordArray)[i].relativeOrigin.y = 0.0 - theGlyphInfoArrayPtr->glyphs[i].deltaY; //         "       "       "       "

        }        

        // Free the GlyphInfoArray

        free(theGlyphInfoArrayPtr);

    }

}

// Disposes of the ATSUI data

//

void DisposeATSUIStuff(void)

{

    verify_noerr( ATSUDisposeStyle(style) );

    verify_noerr( ATSUDisposeTextLayout(layout) );

}