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-rw-r--r--skia/ext/skia_utils_mac.h20
-rw-r--r--skia/ext/skia_utils_mac.mm169
2 files changed, 127 insertions, 62 deletions
diff --git a/skia/ext/skia_utils_mac.h b/skia/ext/skia_utils_mac.h
index 6a0efde..e087867 100644
--- a/skia/ext/skia_utils_mac.h
+++ b/skia/ext/skia_utils_mac.h
@@ -109,16 +109,36 @@ SK_API NSImage* SkBitmapToNSImage(const SkBitmap& icon);
class SK_API SkiaBitLocker {
public:
explicit SkiaBitLocker(SkCanvas* canvas);
+ SkiaBitLocker(SkCanvas* canvas, const SkIRect& userClipRect);
~SkiaBitLocker();
CGContextRef cgContext();
+ bool hasEmptyClipRegion() const;
private:
void releaseIfNeeded();
+ SkIRect computeDirtyRect();
+
SkCanvas* canvas_;
+
+ // If the user specified a clip rect it would draw into then the locker may
+ // skip the step of searching for a rect bounding the pixels that the user
+ // has drawn into.
+ bool userClipRectSpecified_;
+
CGContextRef cgContext_;
SkBitmap bitmap_;
SkIPoint bitmapOffset_;
+
+ // True if we are drawing to |canvas_|'s SkBaseDevice's bits directly through
+ // |bitmap_|. Otherwise, the bits in |bitmap_| are our allocation and need to
+ // be copied over to |canvas_|.
bool useDeviceBits_;
+
+ // True if |bitmap_| is a dummy 1x1 bitmap allocated for the sake of creating
+ // a non-NULL CGContext (it is invalid to use a NULL CGContext), and will not
+ // be copied to |canvas_|. This will happen if |canvas_|'s clip region is
+ // empty.
+ bool bitmapIsDummy_;
};
diff --git a/skia/ext/skia_utils_mac.mm b/skia/ext/skia_utils_mac.mm
index 4f7ddd9..d6b6041 100644
--- a/skia/ext/skia_utils_mac.mm
+++ b/skia/ext/skia_utils_mac.mm
@@ -267,81 +267,107 @@ NSImage* SkBitmapToNSImage(const SkBitmap& skiaBitmap) {
SkiaBitLocker::SkiaBitLocker(SkCanvas* canvas)
: canvas_(canvas),
- cgContext_(0) {
+ userClipRectSpecified_(false),
+ cgContext_(0),
+ useDeviceBits_(false),
+ bitmapIsDummy_(false) {
+}
+
+SkiaBitLocker::SkiaBitLocker(SkCanvas* canvas, const SkIRect& userClipRect)
+ : canvas_(canvas),
+ userClipRectSpecified_(true),
+ cgContext_(0),
+ useDeviceBits_(false),
+ bitmapIsDummy_(false) {
+ canvas_->save();
+ canvas_->clipRect(SkRect::MakeFromIRect(userClipRect));
}
SkiaBitLocker::~SkiaBitLocker() {
releaseIfNeeded();
+ if (userClipRectSpecified_)
+ canvas_->restore();
}
-// This must be called to balance calls to cgContext
-void SkiaBitLocker::releaseIfNeeded() {
- if (!cgContext_)
- return;
- if (useDeviceBits_) {
- bitmap_.unlockPixels();
- } else {
- // Find the bits that were drawn to.
- SkAutoLockPixels lockedPixels(bitmap_);
- const uint32_t* pixelBase
- = reinterpret_cast<uint32_t*>(bitmap_.getPixels());
- int rowPixels = bitmap_.rowBytesAsPixels();
- int width = bitmap_.width();
- int height = bitmap_.height();
- SkIRect bounds;
- bounds.fTop = 0;
- int x;
- int y = -1;
- const uint32_t* pixels = pixelBase;
- while (++y < height) {
- for (x = 0; x < width; ++x) {
- if (pixels[x]) {
- bounds.fTop = y;
- goto foundTop;
- }
+SkIRect SkiaBitLocker::computeDirtyRect() {
+ // If the user specified a clip region, assume that it was tight and that the
+ // dirty rect is approximately the whole bitmap.
+ if (userClipRectSpecified_)
+ return SkIRect::MakeWH(bitmap_.width(), bitmap_.height());
+
+ // Find the bits that were drawn to.
+ SkAutoLockPixels lockedPixels(bitmap_);
+ const uint32_t* pixelBase
+ = reinterpret_cast<uint32_t*>(bitmap_.getPixels());
+ int rowPixels = bitmap_.rowBytesAsPixels();
+ int width = bitmap_.width();
+ int height = bitmap_.height();
+ SkIRect bounds;
+ bounds.fTop = 0;
+ int x;
+ int y = -1;
+ const uint32_t* pixels = pixelBase;
+ while (++y < height) {
+ for (x = 0; x < width; ++x) {
+ if (pixels[x]) {
+ bounds.fTop = y;
+ goto foundTop;
}
- pixels += rowPixels;
}
+ pixels += rowPixels;
+ }
foundTop:
- bounds.fBottom = height;
- y = height;
- pixels = pixelBase + rowPixels * (y - 1);
- while (--y > bounds.fTop) {
- for (x = 0; x < width; ++x) {
- if (pixels[x]) {
- bounds.fBottom = y + 1;
- goto foundBottom;
- }
+ bounds.fBottom = height;
+ y = height;
+ pixels = pixelBase + rowPixels * (y - 1);
+ while (--y > bounds.fTop) {
+ for (x = 0; x < width; ++x) {
+ if (pixels[x]) {
+ bounds.fBottom = y + 1;
+ goto foundBottom;
}
- pixels -= rowPixels;
}
+ pixels -= rowPixels;
+ }
foundBottom:
- bounds.fLeft = 0;
- x = -1;
- while (++x < width) {
- pixels = pixelBase + rowPixels * bounds.fTop;
- for (y = bounds.fTop; y < bounds.fBottom; ++y) {
- if (pixels[x]) {
- bounds.fLeft = x;
- goto foundLeft;
- }
- pixels += rowPixels;
+ bounds.fLeft = 0;
+ x = -1;
+ while (++x < width) {
+ pixels = pixelBase + rowPixels * bounds.fTop;
+ for (y = bounds.fTop; y < bounds.fBottom; ++y) {
+ if (pixels[x]) {
+ bounds.fLeft = x;
+ goto foundLeft;
}
+ pixels += rowPixels;
}
+ }
foundLeft:
- bounds.fRight = width;
- x = width;
- while (--x > bounds.fLeft) {
- pixels = pixelBase + rowPixels * bounds.fTop;
- for (y = bounds.fTop; y < bounds.fBottom; ++y) {
- if (pixels[x]) {
- bounds.fRight = x + 1;
- goto foundRight;
- }
- pixels += rowPixels;
+ bounds.fRight = width;
+ x = width;
+ while (--x > bounds.fLeft) {
+ pixels = pixelBase + rowPixels * bounds.fTop;
+ for (y = bounds.fTop; y < bounds.fBottom; ++y) {
+ if (pixels[x]) {
+ bounds.fRight = x + 1;
+ goto foundRight;
}
+ pixels += rowPixels;
}
+ }
foundRight:
+ return bounds;
+}
+
+// This must be called to balance calls to cgContext
+void SkiaBitLocker::releaseIfNeeded() {
+ if (!cgContext_)
+ return;
+ if (useDeviceBits_) {
+ bitmap_.unlockPixels();
+ } else if (!bitmapIsDummy_) {
+ // Find the bits that were drawn to.
+ SkIRect bounds = computeDirtyRect();
SkBitmap subset;
if (!bitmap_.extractSubset(&subset, bounds)) {
return;
@@ -362,12 +388,19 @@ foundRight:
}
CGContextRelease(cgContext_);
cgContext_ = 0;
+ useDeviceBits_ = false;
+ bitmapIsDummy_ = false;
}
CGContextRef SkiaBitLocker::cgContext() {
SkIRect clip_bounds;
- if (!canvas_->getClipDeviceBounds(&clip_bounds))
- return 0; // the clip is empty, nothing to draw
+ if (!canvas_->getClipDeviceBounds(&clip_bounds)) {
+ // If the clip is empty, then there is nothing to draw. The caller may
+ // attempt to draw (to-be-clipped) results, so ensure there is a dummy
+ // non-NULL CGContext to use.
+ bitmapIsDummy_ = true;
+ clip_bounds = SkIRect::MakeXYWH(0, 0, 1, 1);
+ }
SkBaseDevice* device = canvas_->getTopDevice();
DCHECK(device);
@@ -387,13 +420,20 @@ CGContextRef SkiaBitLocker::cgContext() {
// Only draw directly if we have pixels, and we're only rect-clipped.
// If not, we allocate an offscreen and draw into that, relying on the
// compositing step to apply skia's clip.
- useDeviceBits_ = deviceBits.getPixels() && canvas_->isClipRect();
+ useDeviceBits_ = deviceBits.getPixels() &&
+ canvas_->isClipRect() &&
+ !bitmapIsDummy_;
if (useDeviceBits_) {
- if (!deviceBits.extractSubset(&bitmap_, clip_bounds))
+ bool result = deviceBits.extractSubset(&bitmap_, clip_bounds);
+ DCHECK(result);
+ if (!result)
return 0;
bitmap_.lockPixels();
} else {
- if (!bitmap_.allocN32Pixels(clip_bounds.width(), clip_bounds.height()))
+ bool result = bitmap_.allocN32Pixels(
+ clip_bounds.width(), clip_bounds.height());
+ DCHECK(result);
+ if (!result)
return 0;
bitmap_.eraseColor(0);
}
@@ -402,6 +442,7 @@ CGContextRef SkiaBitLocker::cgContext() {
cgContext_ = CGBitmapContextCreate(bitmap_.getPixels(), bitmap_.width(),
bitmap_.height(), 8, bitmap_.rowBytes(), colorSpace,
kCGBitmapByteOrder32Host | kCGImageAlphaPremultipliedFirst);
+ DCHECK(cgContext_);
SkMatrix matrix = canvas_->getTotalMatrix();
matrix.postTranslate(-SkIntToScalar(bitmapOffset_.x()),
@@ -414,4 +455,8 @@ CGContextRef SkiaBitLocker::cgContext() {
return cgContext_;
}
+bool SkiaBitLocker::hasEmptyClipRegion() const {
+ return canvas_->isClipEmpty();
+}
+
} // namespace gfx
generated by cgit v1.1 at 2024-10-31 01:31:06 +0000