mirror of
https://github.com/gnustep/libs-back.git
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55647cbdf1
git-svn-id: svn+ssh://svn.gna.org/svn/gnustep/libs/back/trunk@19800 72102866-910b-0410-8b05-ffd578937521
139 lines
3.8 KiB
Objective-C
139 lines
3.8 KiB
Objective-C
/*
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Copyright (C) 2004 Free Software Foundation, Inc.
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Author: Alexander Malmberg <alexander@malmberg.org>
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This file is part of GNUstep.
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This library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Library General Public
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License as published by the Free Software Foundation; either
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version 2 of the License, or (at your option) any later version.
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This library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Library General Public License for more details.
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You should have received a copy of the GNU Library General Public
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License along with this library; if not, write to the Free
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Software Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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*/
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#include "ARTGState.h"
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#ifndef RDS
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#include "x11/XWindowBuffer.h"
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#endif
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#include "blit.h"
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#include <math.h>
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#include <Foundation/NSData.h>
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#include <Foundation/NSValue.h>
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#include <AppKit/NSAffineTransform.h>
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#include <AppKit/NSGraphics.h>
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@implementation ARTGState (ReadRect)
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-(NSDictionary *) GSReadRect: (NSRect)r
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{
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NSMutableDictionary *md = [[NSMutableDictionary alloc] init];
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NSAffineTransform *matrix;
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int x0, y0, x1, y1, w, h;
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NSPoint p;
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/* Get the bounding rect in pixel coordinates. */
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p = r.origin;
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p = [ctm pointInMatrixSpace: p];
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x0 = floor(p.x); x1 = ceil(p.x);
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y0 = floor(p.y); y1 = ceil(p.y);
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#define CHECK do { \
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if (floor(p.x)<x0) x0=floor(p.x); \
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if (floor(p.y)<y0) y0=floor(p.y); \
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if (ceil(p.x)>x1) x1=ceil(p.x); \
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if (ceil(p.y)>y1) y1=ceil(p.y); } while (0)
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p = r.origin; p.x += r.size.width;
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p = [ctm pointInMatrixSpace: p];
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CHECK;
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p = r.origin; p.x += r.size.width; p.y += r.size.height;
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p = [ctm pointInMatrixSpace: p];
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CHECK;
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p = r.origin; p.y += r.size.height;
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p = [ctm pointInMatrixSpace: p];
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CHECK;
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#undef CHECK
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/* Clip to the window. */
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if (x0 < 0) x0 = 0;
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if (x1 < 0) x1 = 0;
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if (x0 > wi->sx) x0 = wi->sx;
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if (x1 > wi->sx) x1 = wi->sx;
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if (y0 < 0) y0 = 0;
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if (y1 < 0) y1 = 0;
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if (y0 > wi->sy) y0 = wi->sy;
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if (y1 > wi->sy) y1 = wi->sy;
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w = x1 - x0;
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h = y1 - y0;
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if (w <= 0 || h <= 0)
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w = h = 0;
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/* The matrix is the transform from user space to image space, and image
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space has its origin in the lower left corner if the image. Thus, we need
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to translate the ctm according to the position of the lower left corner
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in the window. */
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matrix=[ctm copy];
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[matrix translateXBy: -x0 yBy: -y0];
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[md setObject: NSDeviceRGBColorSpace forKey: @"ColorSpace"];
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[md setObject: [NSNumber numberWithUnsignedInt: 1] forKey: @"HasAlpha"];
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[md setObject: [NSNumber numberWithUnsignedInt: 8] forKey: @"BitsPerSample"];
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[md setObject: [NSNumber numberWithUnsignedInt: 4] forKey: @"SamplesPerPixel"];
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[md setObject: [NSValue valueWithSize: NSMakeSize(w, h)] forKey: @"Size"];
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[md setObject: matrix forKey: @"Matrix"];
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[matrix release];
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if (!w || !h)
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return [[md autorelease] makeImmutableCopyOnFail: YES];
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/* The rectangle isn't degenerate, so we need to actually copy some data. */
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{
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NSMutableData *d;
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int y;
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composite_run_t c;
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d = [[NSMutableData alloc] initWithLength: w * h * 4];
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c.dst = [d mutableBytes];
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c.src = wi->data + (wi->sy - y1) * wi->bytes_per_line + x0 * DI.bytes_per_pixel;
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c.srca = wi->alpha + (wi->sy - y1) * wi->sx + x0;
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for (y = 0; y < h; y++)
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{
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if (wi->has_alpha)
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DI.read_pixels_a(&c, w);
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else
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DI.read_pixels_o(&c, w);
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c.src += wi->bytes_per_line;
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c.srca += wi->sx;
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c.dst += w * 4;
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}
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[md setObject: [[d autorelease] makeImmutableCopyOnFail: YES] forKey: @"Data"];
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}
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return [[md autorelease] makeImmutableCopyOnFail: YES];
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}
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@end
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