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