/*

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                copyrights in this original Apple software (the "Apple Software"), to use,

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                this notice and the following text and disclaimers in all such redistributions of

                the Apple Software.  Neither the name, trademarks, service marks or logos of

                Apple Computer, Inc. may be used to endorse or promote products derived from the

                Apple Software without specific prior written permission from Apple.  Except as

                expressly stated in this notice, no other rights or licenses, express or implied,

                are granted by Apple herein, including but not limited to any patent rights that

                may be infringed by your derivative works or by other works in which the Apple

                Software may be incorporated.

                The Apple Software is provided by Apple on an "AS IS" basis.  APPLE MAKES NO

                WARRANTIES, EXPRESS OR IMPLIED, INCLUDING WITHOUT LIMITATION THE IMPLIED

                WARRANTIES OF NON-INFRINGEMENT, MERCHANTABILITY AND FITNESS FOR A PARTICULAR

                PURPOSE, REGARDING THE APPLE SOFTWARE OR ITS USE AND OPERATION ALONE OR IN

                COMBINATION WITH YOUR PRODUCTS.

                IN NO EVENT SHALL APPLE BE LIABLE FOR ANY SPECIAL, INDIRECT, INCIDENTAL OR

                CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE

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*/

#import <Cocoa/Cocoa.h>

#import "GBuffer.h"

@implementation GBuffer

//private

- (BOOL) createCGContext

{

    if (cg_context)

        return YES;

    else

    {

        CGColorSpaceRef colorspace_ref = CGColorSpaceCreateDeviceRGB();

        if (!colorspace_ref)

            return NO;

        else

        {

            size_t buffer_rowbytes =  (size_t) buffer_size.width * (buffer_bitdepth >> 3);

            CGImageAlphaInfo alpha_info = kCGImageAlphaPremultipliedFirst;

            cg_context = CGBitmapContextCreate(buffer_ptr, (UInt32) buffer_size.width, (UInt32) buffer_size.height, 8, buffer_rowbytes, colorspace_ref, alpha_info);

            if (cg_context)

            {

                CGContextSetFillColorSpace(cg_context, colorspace_ref);

                CGContextSetStrokeColorSpace(cg_context, colorspace_ref);

            }

            CGColorSpaceRelease(colorspace_ref);

            colorspace_ref = NULL;

        }

    }

    return !!cg_context;

}

+ (id) create: (CGSize) size bitDepth: (UInt8) bitdepth

{

    GBuffer* buffer = [[[GBuffer alloc] init] autorelease];

    if (![buffer sizeTo: size bitDepth: bitdepth])

        return nil;

    if (![buffer createCGContext])

        return nil;

    return [buffer retain];

}

- (void) clear: (float) alpha

{

    CGContextSetRGBFillColor(cg_context, 0.0, 0.0, 0.0, alpha);

    CGContextFillRect(cg_context, CGRectMake(0,0, buffer_size.width, buffer_size.height));

}

- (BOOL) sizeTo: (CGSize) size bitDepth: (UInt8) bitdepth

{

    UInt32 buffer_rowbytes = (UInt32) size.width * (bitdepth>>3);

    UInt32 pixel_format = bitdepth == 16 ? k16BE555PixelFormat : k32ARGBPixelFormat;

    buffer_memory_size = (size_t) size.height * buffer_rowbytes;

    buffer_ptr = (Ptr) malloc(buffer_memory_size);

    if (!buffer_ptr)

    {

        NSLog(@"buffer malloc failed");

        return NO;

    }

    else

    {

        GWorldFlags flags = useTempMem+keepLocal;

        Rect bounds_rect = { 0,0, size.height,size.width };

        OSErr err = NewGWorldFromPtr(&gworld_ptr, pixel_format, &bounds_rect, NULL, NULL, flags, buffer_ptr, buffer_rowbytes);

        if (err != noErr || !gworld_ptr)

        {

            NSLog(@"NewGWorld failed %d, %1.f x %1.f", buffer_bitdepth, buffer_size.width, buffer_size.height);

            return NO;

        }

        pixmap_handle = GetGWorldPixMap(gworld_ptr);

        if (!pixmap_handle)

        {

            NSLog(@"GetGWorldPixMap");

            return NO;

        }

        LockPixels(pixmap_handle);

    }

    buffer_size = size;

    buffer_bitdepth = bitdepth;

    return YES;

}

- (void) blitRect:(CGRect) src_rect dstBuffer:(GBuffer*) dst_buffer dst:(CGPoint) dst

{

    Rect srcRect, dstRect;

    SetRect(&srcRect, 0,0, src_rect.size.width, src_rect.size.height);

    OffsetRect(&srcRect, src_rect.origin.x, src_rect.origin.y);

    SetRect(&dstRect, 0,0, src_rect.size.width, src_rect.size.height);

    OffsetRect(&dstRect, dst.x, dst.y);

    {

        const BitMap* src_bitmap = GetPortBitMapForCopyBits(gworld_ptr);

        const BitMap* dst_bitmap = GetPortBitMapForCopyBits(dst_buffer->gworld_ptr);

        CopyBits(src_bitmap, dst_bitmap, &srcRect, &dstRect, srcCopy, NULL);

    }   

}   

- (void) renderText: (const char*) text font: (const char*) font size: (int) size

{

    CGContextSetRGBFillColor(cg_context, 0.0, 0.0, 0.0, 1.0);

    CGContextFillRect(cg_context, CGRectMake(0,0, buffer_size.width, buffer_size.height));

    CGContextSetRGBFillColor(cg_context, 1.0, 1.0, 1.0, 1.0);

    CGContextSelectFont(cg_context, font, size, kCGEncodingMacRoman);

    CGContextSetTextDrawingMode(cg_context, kCGTextFill);

    CGContextShowTextAtPoint(cg_context, 0, buffer_size.height*.25, text, strlen(text));

    CGContextFlush(cg_context);

}

- (void) renderGlyph: (CGGlyph) glyph typeface: (const char*) typeface size: (int) size offset: (CGPoint) offset  

{

    CGContextSetRGBFillColor(cg_context, 1.0, 1.0, 1.0, 1.0);

    CGContextSelectFont(cg_context, typeface, size, kCGEncodingMacRoman);

    CGContextSetTextDrawingMode(cg_context, kCGTextFill);

    CGContextShowGlyphsAtPoint(cg_context, offset.x, offset.y, &glyph, 1);

    CGContextFlush(cg_context);

}

@end