// This example is almost identical to the helloworld example, except that
// in this case, there are two styles instead of just one. ATSUSetRunStyle
// is used to apply a style to different parts of the text.
//
void DrawMultipleStylesContents(WindowRef window)
{
CFStringRef string;
UniChar *text;
UniCharCount length;
UniCharArrayOffset currentStart, currentEnd;
ATSUStyle style1, style2;
ATSUTextLayout layout;
ATSUFontID font;
Fixed pointSize;
ATSUAttributeTag tags[2];
ByteCount sizes[2];
ATSUAttributeValuePtr values[2];
Fixed lineWidth, ascent, descent;
CGContextRef cgContext;
float x, y, cgY, windowHeight;
ItemCount numSoftBreaks;
UniCharArrayOffset *theSoftBreaks;
int i;
GrafPtr port, savedPort;
Rect portBounds;
// Set up the graphics port
port = GetWindowPort(window);
GetPort(&savedPort);
SetPort(port);
GetPortBounds(port, &portBounds);
EraseRect(&portBounds);
// Create a style object. This is one of two objects necessary to draw using ATSUI.
// (The layout is the other.)
verify_noerr( ATSUCreateStyle(&style1) );
// Look up the font we are going to use, and set it in the style object, using
// the aforementioned "triple" (tag, size, value) semantics. This is how almost
// all settings in ATSUI are applied.
verify_noerr( ATSUFindFontFromName(kMultipleStylesFontName, strlen(kMultipleStylesFontName), kFontFullName, kFontNoPlatform, kFontNoScript, kFontNoLanguage, &font) );
tags[0] = kATSUFontTag;
sizes[0] = sizeof(ATSUFontID);
values[0] = &font;
verify_noerr( ATSUSetAttributes(style1, 1, tags, sizes, values) );
// Set the point size, also using a triple. You can actually set multiple triples at once,
// since the tag, size, and value parameters are arrays. Other examples do this, such as
// the vertical text example.
//
pointSize = Long2Fix(kMultipleStylesFontSize);
tags[0] = kATSUSizeTag;
sizes[0] = sizeof(Fixed);
values[0] = &pointSize;
verify_noerr( ATSUSetAttributes(style1, 1, tags, sizes, values) );
// Now we create the second of two objects necessary to draw text using ATSUI, the layout.
// You can specify a pointer to the text buffer at layout creation time, or later using
// the routine ATSUSetTextPointerLocation(). Below, we do it after layout creation time.
verify_noerr( ATSUCreateTextLayout(&layout) );
// Before assigning text to the layout, we must first convert the string we plan to draw
// from a CFStringRef into an array of UniChar.
string = CFStringCreateWithCString(NULL, "In this example, various parts of the text have different styles applied. The same style is used more than once.", kCFStringEncodingASCII);
// Extract the raw Unicode from the CFString, then dispose of the CFString
length = CFStringGetLength(string);
text = (UniChar *)malloc(length * sizeof(UniChar));
CFStringGetCharacters(string, CFRangeMake(0, length), text);
CFRelease(string);
// Attach the resulting UTF-16 Unicode text to the layout
verify_noerr( ATSUSetTextPointerLocation(layout, text, kATSUFromTextBeginning, kATSUToTextEnd, length) );
// Now we tie the two necessary objects, the layout and the style, together
verify_noerr( ATSUSetRunStyle(layout, style1, kATSUFromTextBeginning, kATSUToTextEnd) );
// Now, for this example we create a second style, and assign it to various runs within
// the text. For our example, the run offsets are hard-coded for simplicity's sake. In
// a real application, style runs are often assigned from external sources, such as user
// selection.
verify_noerr( ATSUCreateAndCopyStyle(style1, &style2) );
// Change the font for the second style
verify_noerr( ATSUFindFontFromName(kMultipleStylesFontName2, strlen(kMultipleStylesFontName2), kFontFullName, kFontNoPlatform, kFontNoScript, kFontNoLanguage, &font) );
tags[0] = kATSUFontTag;
sizes[0] = sizeof(ATSUFontID);
values[0] = &font;
verify_noerr( ATSUSetAttributes(style2, 1, tags, sizes, values) );
// Apply the new style to the text in various places
verify_noerr( ATSUSetRunStyle(layout, style2, 8, 7) ); // The word "example"
verify_noerr( ATSUSetRunStyle(layout, style2, 65, 7) ); // The word "applied"
verify_noerr( ATSUSetRunStyle(layout, style2, 83, 5) ); // The word "style"
verify_noerr( ATSUSetRunStyle(layout, style2, 107, 4) ); // The word "once"
// In this example, we are breaking text into lines.
// Therefore, we need to know the width of the line.
lineWidth = X2Fix(portBounds.right - portBounds.left - 2.0*kMultipleStylesMargin);
tags[0] = kATSULineWidthTag;
sizes[0] = sizeof(Fixed);
values[0] = &lineWidth;
verify_noerr( ATSUSetLayoutControls(layout, 1, tags, sizes, values) );
// Prepare the CGContext for drawing
QDBeginCGContext(port, &cgContext);
tags[0] = kATSUCGContextTag;
sizes[0] = sizeof(CGContextRef);
values[0] = &cgContext;
verify_noerr( ATSUSetLayoutControls(layout, 1, tags, sizes, values) );
// Prepare the coordinates for drawing. In our example, "x" and "y" are the coordinates
// in QD space. "cgY" contains the y coordinate in CG space.
//
windowHeight = portBounds.bottom - portBounds.top;
x = kMultipleStylesMargin; // leave a small left margin
y = kMultipleStylesMargin; // leave a small top margin
cgY = windowHeight - y; // Subtract the y coordinate from the height of the
// window to get the coordinate in CG-aware space.
// Break the text into lines
verify_noerr( ATSUBatchBreakLines(layout, kATSUFromTextBeginning, length, lineWidth, &numSoftBreaks) );
verify_noerr( ATSUGetSoftLineBreaks(layout, kATSUFromTextBeginning, kATSUToTextEnd, 0, NULL, &numSoftBreaks) );
theSoftBreaks = (UniCharArrayOffset *) malloc(numSoftBreaks * sizeof(UniCharArrayOffset));
verify_noerr( ATSUGetSoftLineBreaks(layout, kATSUFromTextBeginning, kATSUToTextEnd, numSoftBreaks, theSoftBreaks, &numSoftBreaks) );
// Loop over all the lines and draw them
currentStart = 0;
for (i=0; i <= numSoftBreaks; i++) {
currentEnd = ((numSoftBreaks > 0 ) && (numSoftBreaks > i)) ? theSoftBreaks[i] : length;
// This is the height of a line, the ascent and descent. Getting the values this way is the preferred method.
ATSUGetLineControl(layout, currentStart, kATSULineAscentTag, sizeof(ATSUTextMeasurement), &ascent, NULL);
ATSUGetLineControl(layout, currentStart, kATSULineDescentTag, sizeof(ATSUTextMeasurement), &descent, NULL);
// Make room for the area above the baseline
y += Fix2X(ascent);
cgY = windowHeight - y;
// Draw the text
verify_noerr( ATSUDrawText(layout, currentStart, currentEnd - currentStart, X2Fix(x), X2Fix(cgY)) );
// Make room for the area beloww the baseline
y += Fix2X(descent);
// Prepare for next line
currentStart = currentEnd;
}
// This is a one-shot window, so we are now ready to dispose of all our objects.
// Normally, we would want to keep everything around in case we needed to redraw or change
// the text at some point.
// Tear down the CGContext
CGContextFlush(cgContext);
QDEndCGContext(port, &cgContext);
// Deallocate string storage
free(text);
// Layout and styles also need to be disposed
verify_noerr( ATSUDisposeStyle(style1) );
verify_noerr( ATSUDisposeStyle(style2) );
verify_noerr( ATSUDisposeTextLayout(layout) );
// Restore the graphics port
SetPort(savedPort);
}
void drawPlugin(NPP instance, NPCocoaEvent* event)
{
if (!browserUAString)
return;
PluginInstance* currentInstance = (PluginInstance*)(instance->pdata);
CGContextRef cgContext = event->data.draw.context;
if (!cgContext)
return;
float windowWidth = currentInstance->window.width;
float windowHeight = currentInstance->window.height;
// save the cgcontext gstate
CGContextSaveGState(cgContext);
// we get a flipped context
CGContextTranslateCTM(cgContext, 0.0, windowHeight);
CGContextScaleCTM(cgContext, 1.0, -1.0);
// draw a gray background for the plugin
CGContextAddRect(cgContext, CGRectMake(0, 0, windowWidth, windowHeight));
CGContextSetGrayFillColor(cgContext, 0.5, 1.0);
CGContextDrawPath(cgContext, kCGPathFill);
// draw a black frame around the plugin
CGContextAddRect(cgContext, CGRectMake(0, 0, windowWidth, windowHeight));
CGContextSetGrayStrokeColor(cgContext, 0.0, 1.0);
CGContextSetLineWidth(cgContext, 6.0);
CGContextStrokePath(cgContext);
// draw the UA string using ATSUI
CGContextSetGrayFillColor(cgContext, 0.0, 1.0);
ATSUStyle atsuStyle;
ATSUCreateStyle(&atsuStyle);
CFIndex stringLength = CFStringGetLength(browserUAString);
UniChar* unicharBuffer = (UniChar*)malloc((stringLength + 1) * sizeof(UniChar));
CFStringGetCharacters(browserUAString, CFRangeMake(0, stringLength), unicharBuffer);
UniCharCount runLengths = kATSUToTextEnd;
ATSUTextLayout atsuLayout;
ATSUCreateTextLayoutWithTextPtr(unicharBuffer,
kATSUFromTextBeginning,
kATSUToTextEnd,
stringLength,
1,
&runLengths,
&atsuStyle,
&atsuLayout);
ATSUAttributeTag contextTag = kATSUCGContextTag;
ByteCount byteSize = sizeof(CGContextRef);
ATSUAttributeValuePtr contextATSUPtr = &cgContext;
ATSUSetLayoutControls(atsuLayout, 1, &contextTag, &byteSize, &contextATSUPtr);
ATSUTextMeasurement lineAscent, lineDescent;
ATSUGetLineControl(atsuLayout,
kATSUFromTextBeginning,
kATSULineAscentTag,
sizeof(ATSUTextMeasurement),
&lineAscent,
&byteSize);
ATSUGetLineControl(atsuLayout,
kATSUFromTextBeginning,
kATSULineDescentTag,
sizeof(ATSUTextMeasurement),
&lineDescent,
&byteSize);
float lineHeight = FixedToFloat(lineAscent) + FixedToFloat(lineDescent);
ItemCount softBreakCount;
ATSUBatchBreakLines(atsuLayout,
kATSUFromTextBeginning,
stringLength,
FloatToFixed(windowWidth - 10.0),
&softBreakCount);
ATSUGetSoftLineBreaks(atsuLayout,
kATSUFromTextBeginning,
kATSUToTextEnd,
0, NULL, &softBreakCount);
UniCharArrayOffset* softBreaks = (UniCharArrayOffset*)malloc(softBreakCount * sizeof(UniCharArrayOffset));
ATSUGetSoftLineBreaks(atsuLayout,
kATSUFromTextBeginning,
kATSUToTextEnd,
softBreakCount, softBreaks, &softBreakCount);
UniCharArrayOffset currentDrawOffset = kATSUFromTextBeginning;
int i = 0;
while (i < softBreakCount) {
ATSUDrawText(atsuLayout, currentDrawOffset, softBreaks[i], FloatToFixed(5.0), FloatToFixed(windowHeight - 5.0 - (lineHeight * (i + 1.0))));
currentDrawOffset = softBreaks[i];
i++;
}
ATSUDrawText(atsuLayout, currentDrawOffset, kATSUToTextEnd, FloatToFixed(5.0), FloatToFixed(windowHeight - 5.0 - (lineHeight * (i + 1.0))));
free(unicharBuffer);
free(softBreaks);
// restore the cgcontext gstate
CGContextRestoreGState(cgContext);
}
