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/* This file is part of Owl.
*
* Copyright © 2019-2021 Sergey Bugaev <bugaevc@gmail.com>
*
* Owl is free software: you can redistribute it and/or modify it
* under the terms of the GNU General Public License as published
* by the Free Software Foundation, either version 3 of the License,
* or (at your option) any later version.
*
* Owl is distributed in the hope that it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
* for more details.
*
* You should have received a copy of the GNU General Public License
* along with Owl. If not, see <http://www.gnu.org/licenses/>.
*/
#import "OwlShmBuffer.h"
#import "OwlFeatures.h"
@implementation OwlShmBuffer
#ifdef OWL_PLATFORM_APPLE
- (CGBitmapInfo) bitmapInfoForWlShmFormat: (enum wl_shm_format) shmFormat {
switch (shmFormat) {
case WL_SHM_FORMAT_XRGB8888:
return kCGImageAlphaNoneSkipFirst | kCGBitmapByteOrder32Little;
case WL_SHM_FORMAT_ARGB8888:
return kCGImageAlphaFirst | kCGBitmapByteOrder32Little;
default:
NSLog(@"Unknown shm format");
return 0;
}
}
static void dataReleaseCallback(void *info, const void *data, size_t size) {
free((void *) data);
}
#endif /* OWL_PLATFORM_APPLE */
- (void) releaseImage {
#ifdef OWL_PLATFORM_APPLE
if (_image != NULL) {
CGImageRelease(_image);
_image = NULL;
}
#else
[_rep release];
_rep = nil;
#endif
}
- (void) invalidate {
[self releaseImage];
enum wl_shm_format format = wl_shm_buffer_get_format(_buffer);
size_t width = wl_shm_buffer_get_width(_buffer);
size_t height = wl_shm_buffer_get_height(_buffer);
size_t stride = wl_shm_buffer_get_stride(_buffer);
void *data = wl_shm_buffer_get_data(_buffer);
size_t size = height * stride;
#ifdef OWL_PLATFORM_APPLE
CGBitmapInfo bitmapInfo = [self bitmapInfoForWlShmFormat: format];
CGColorSpaceRef colorSpace = CGColorSpaceCreateDeviceRGB();
void *dataCopy = malloc(size);
wl_shm_buffer_begin_access(_buffer);
memcpy(dataCopy, data, size);
wl_shm_buffer_end_access(_buffer);
[self sendRelease];
CGDataProviderRef provider = CGDataProviderCreateWithData(
NULL,
dataCopy,
size,
dataReleaseCallback
);
_image = CGImageCreate(
width,
height,
8, // bitsPerComponent
32, // bitsPerPixel
stride,
colorSpace,
bitmapInfo,
provider,
NULL, // decode
YES, // shouldInterpolate
kCGRenderingIntentDefault
);
CGDataProviderRelease(provider);
CGColorSpaceRelease(colorSpace);
#else /* OWL_PLATFORM_APPLE */
BOOL hasAlpha = format == WL_SHM_FORMAT_ARGB8888;
size_t samplesPerPixel = hasAlpha ? 4 : 3;
size_t destStride = samplesPerPixel * width;
_rep = [NSBitmapImageRep alloc];
_rep = [_rep initWithBitmapDataPlanes: NULL
pixelsWide: width
pixelsHigh: height
bitsPerSample: 8
samplesPerPixel: samplesPerPixel
hasAlpha: hasAlpha
isPlanar: NO
colorSpaceName: NSCalibratedRGBColorSpace
bitmapFormat: 0
bytesPerRow: destStride
bitsPerPixel: 8 * samplesPerPixel];
void *destData = [_rep bitmapData];
wl_shm_buffer_begin_access(_buffer);
struct bgra {
unsigned char b, g, r, a;
};
struct rgba {
unsigned char r, g, b, a;
};
for (size_t row = 0; row < height; row++) {
for (size_t col = 0; col < width; col++) {
struct bgra *source = data + row * stride + col * 4;
struct rgba *dest = destData + row * destStride + col * samplesPerPixel;
dest->r = source->r;
dest->g = source->g;
dest->b = source->b;
if (hasAlpha) {
dest->a = source->a;
}
}
}
wl_shm_buffer_end_access(_buffer);
[self sendRelease];
#endif /* OWL_PLATFORM_APPLE */
}
- (id) initWithResource: (struct wl_resource *) resource {
self = [super initWithExternallyImplementedResource: resource];
_buffer = wl_shm_buffer_get(resource);
if (_buffer == NULL) {
[NSException raise: NSInternalInconsistencyException
format: @"wl_shm_buffer_get(wl_buffer@%u) == NULL",
wl_resource_get_id(resource)];
return nil;
}
return self;
}
- (void) dealloc {
[self releaseImage];
[super dealloc];
}
- (NSSize) size {
size_t width = wl_shm_buffer_get_width(_buffer);
size_t height = wl_shm_buffer_get_height(_buffer);
return NSMakeSize(width, height);
}
- (void) drawInRect: (NSRect) rect {
#ifdef OWL_PLATFORM_APPLE
CGContextRef context = [[NSGraphicsContext currentContext] graphicsPort];
CGContextSetBlendMode(context, kCGBlendModeCopy);
CGContextDrawImage(context, rect, _image);
#else
[_rep drawInRect: rect
fromRect: rect
operation: NSCompositeSourceOver
fraction: 1.0
respectFlipped: NO
hints: nil];
#endif
}
@end
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