mirror of https://github.com/axmolengine/axmol.git
121 lines
4.3 KiB
C
121 lines
4.3 KiB
C
/*
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* Copyright (C) 2006 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#ifndef SkMask_DEFINED
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#define SkMask_DEFINED
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#include "SkRect.h"
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/** \class SkMask
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SkMask is used to describe alpha bitmaps, either 1bit, 8bit, or
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the 3-channel 3D format. These are passed to SkMaskFilter objects.
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*/
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struct SkMask {
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enum Format {
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kBW_Format, //!< 1bit per pixel mask (e.g. monochrome)
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kA8_Format, //!< 8bits per pixel mask (e.g. antialiasing)
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k3D_Format, //!< 3 8bit per pixl planes: alpha, mul, add
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kARGB32_Format, //!< SkPMColor
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kLCD16_Format, //!< 565 alpha for r/g/b
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kLCD32_Format //!< 888 alpha for r/g/b
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};
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enum {
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kCountMaskFormats = kLCD32_Format + 1
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};
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uint8_t* fImage;
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SkIRect fBounds;
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uint32_t fRowBytes;
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Format fFormat;
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/** Returns true if the mask is empty: i.e. it has an empty bounds.
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*/
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bool isEmpty() const { return fBounds.isEmpty(); }
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/** Return the byte size of the mask, assuming only 1 plane.
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Does not account for k3D_Format. For that, use computeTotalImageSize().
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If there is an overflow of 32bits, then returns 0.
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*/
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size_t computeImageSize() const;
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/** Return the byte size of the mask, taking into account
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any extra planes (e.g. k3D_Format).
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If there is an overflow of 32bits, then returns 0.
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*/
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size_t computeTotalImageSize() const;
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/** Returns the address of the byte that holds the specified bit.
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Asserts that the mask is kBW_Format, and that x,y are in range.
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x,y are in the same coordiate space as fBounds.
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*/
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uint8_t* getAddr1(int x, int y) const {
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SkASSERT(fFormat == kBW_Format);
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SkASSERT(fBounds.contains(x, y));
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SkASSERT(fImage != NULL);
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return fImage + ((x - fBounds.fLeft) >> 3) + (y - fBounds.fTop) * fRowBytes;
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}
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/** Returns the address of the specified byte.
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Asserts that the mask is kA8_Format, and that x,y are in range.
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x,y are in the same coordiate space as fBounds.
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*/
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uint8_t* getAddr(int x, int y) const {
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SkASSERT(fFormat != kBW_Format);
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SkASSERT(fBounds.contains(x, y));
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SkASSERT(fImage != NULL);
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return fImage + x - fBounds.fLeft + (y - fBounds.fTop) * fRowBytes;
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}
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/**
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* Return the address of the specified 16bit mask. In the debug build,
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* this asserts that the mask's format is kLCD16_Format, and that (x,y)
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* are contained in the mask's fBounds.
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*/
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uint16_t* getAddrLCD16(int x, int y) const {
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SkASSERT(kLCD16_Format == fFormat);
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SkASSERT(fBounds.contains(x, y));
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SkASSERT(fImage != NULL);
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uint16_t* row = (uint16_t*)(fImage + (y - fBounds.fTop) * fRowBytes);
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return row + (x - fBounds.fLeft);
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}
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/**
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* Return the address of the specified 32bit mask. In the debug build,
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* this asserts that the mask's format is kLCD32_Format, and that (x,y)
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* are contained in the mask's fBounds.
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*/
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uint32_t* getAddrLCD32(int x, int y) const {
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SkASSERT(kLCD32_Format == fFormat);
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SkASSERT(fBounds.contains(x, y));
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SkASSERT(fImage != NULL);
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uint32_t* row = (uint32_t*)(fImage + (y - fBounds.fTop) * fRowBytes);
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return row + (x - fBounds.fLeft);
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}
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static uint8_t* AllocImage(size_t bytes);
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static void FreeImage(void* image);
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enum CreateMode {
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kJustComputeBounds_CreateMode, //!< compute bounds and return
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kJustRenderImage_CreateMode, //!< render into preallocate mask
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kComputeBoundsAndRenderImage_CreateMode //!< compute bounds, alloc image and render into it
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};
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};
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#endif
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