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author | 2011-10-12 19:53:16 +0000 | |
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committer | 2011-10-12 19:53:16 +0000 | |
commit | d38f137e9b813f8193675ebd3dfbfe8bc42639e9 (patch) | |
tree | 1e670c378d7b31a4538fde3c2b3e4e29b72c05b5 /src/gpu/GrRectanizer_fifo.cpp | |
parent | 4d5cb45f3e3e62633304b4911d131cdd02dfd541 (diff) |
Move gpu/include/* to include/gpu and gpu/src/* to src/gpu
Review URL: http://codereview.appspot.com/5250070/
git-svn-id: http://skia.googlecode.com/svn/trunk@2471 2bbb7eff-a529-9590-31e7-b0007b416f81
Diffstat (limited to 'src/gpu/GrRectanizer_fifo.cpp')
-rw-r--r-- | src/gpu/GrRectanizer_fifo.cpp | 123 |
1 files changed, 123 insertions, 0 deletions
diff --git a/src/gpu/GrRectanizer_fifo.cpp b/src/gpu/GrRectanizer_fifo.cpp new file mode 100644 index 0000000000..3bfc46f4a3 --- /dev/null +++ b/src/gpu/GrRectanizer_fifo.cpp @@ -0,0 +1,123 @@ + +/* + * Copyright 2010 Google Inc. + * + * Use of this source code is governed by a BSD-style license that can be + * found in the LICENSE file. + */ + + + +#include "GrRectanizer.h" +#include "GrTBSearch.h" + +#define MIN_HEIGHT_POW2 2 + +class GrRectanizerFIFO : public GrRectanizer { +public: + GrRectanizerFIFO(int w, int h) : GrRectanizer(w, h) { + fNextStripY = 0; + fAreaSoFar = 0; + Gr_bzero(fRows, sizeof(fRows)); + } + + virtual ~GrRectanizerFIFO() { + } + + virtual bool addRect(int w, int h, GrIPoint16* loc); + + virtual float percentFull() const { + return fAreaSoFar / ((float)this->width() * this->height()); + } + + virtual int stripToPurge(int height) const { return -1; } + virtual void purgeStripAtY(int yCoord) { } + + /////////////////////////////////////////////////////////////////////////// + + struct Row { + GrIPoint16 fLoc; + int fRowHeight; + + bool canAddWidth(int width, int containerWidth) const { + return fLoc.fX + width <= containerWidth; + } + }; + + Row fRows[16]; + + static int HeightToRowIndex(int height) { + GrAssert(height >= MIN_HEIGHT_POW2); + return 32 - Gr_clz(height - 1); + } + + int fNextStripY; + int32_t fAreaSoFar; + + bool canAddStrip(int height) const { + return fNextStripY + height <= this->height(); + } + + void initRow(Row* row, int rowHeight) { + row->fLoc.set(0, fNextStripY); + row->fRowHeight = rowHeight; + fNextStripY += rowHeight; + } +}; + +bool GrRectanizerFIFO::addRect(int width, int height, GrIPoint16* loc) { + if ((unsigned)width > (unsigned)this->width() || + (unsigned)height > (unsigned)this->height()) { + return false; + } + + int32_t area = width * height; + + /* + We use bsearch, but there may be more than one row with the same height, + so we actually search for height-1, which can only be a pow2 itself if + height == 2. Thus we set a minimum height. + */ + height = GrNextPow2(height); + if (height < MIN_HEIGHT_POW2) { + height = MIN_HEIGHT_POW2; + } + + Row* row = &fRows[HeightToRowIndex(height)]; + GrAssert(row->fRowHeight == 0 || row->fRowHeight == height); + + if (0 == row->fRowHeight) { + if (!this->canAddStrip(height)) { + return false; + } + this->initRow(row, height); + } else { + if (!row->canAddWidth(width, this->width())) { + if (!this->canAddStrip(height)) { + return false; + } + // that row is now "full", so retarget our Row record for + // another one + this->initRow(row, height); + } + } + + GrAssert(row->fRowHeight == height); + GrAssert(row->canAddWidth(width, this->width())); + *loc = row->fLoc; + row->fLoc.fX += width; + + GrAssert(row->fLoc.fX <= this->width()); + GrAssert(row->fLoc.fY <= this->height()); + GrAssert(fNextStripY <= this->height()); + fAreaSoFar += area; + return true; +} + +/////////////////////////////////////////////////////////////////////////////// + +GrRectanizer* GrRectanizer::Factory(int width, int height) { + return new GrRectanizerFIFO(width, height); +} + + |