reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame^] | 1 | /* libs/graphics/sgl/SkColorFilter.cpp |
| 2 | ** |
| 3 | ** Copyright 2006, The Android Open Source Project |
| 4 | ** |
| 5 | ** Licensed under the Apache License, Version 2.0 (the "License"); |
| 6 | ** you may not use this file except in compliance with the License. |
| 7 | ** You may obtain a copy of the License at |
| 8 | ** |
| 9 | ** http://www.apache.org/licenses/LICENSE-2.0 |
| 10 | ** |
| 11 | ** Unless required by applicable law or agreed to in writing, software |
| 12 | ** distributed under the License is distributed on an "AS IS" BASIS, |
| 13 | ** WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| 14 | ** See the License for the specific language governing permissions and |
| 15 | ** limitations under the License. |
| 16 | */ |
| 17 | |
| 18 | #include "SkColorFilter.h" |
| 19 | #include "SkShader.h" |
| 20 | |
| 21 | void SkColorFilter::filterSpan16(const uint16_t s[], int count, uint16_t d[]) |
| 22 | { |
| 23 | SkASSERT(this->getFlags() & SkColorFilter::kHasFilter16_Flag); |
| 24 | SkASSERT(!"missing implementation of SkColorFilter::filterSpan16"); |
| 25 | |
| 26 | if (d != s) |
| 27 | memcpy(d, s, count * sizeof(uint16_t)); |
| 28 | } |
| 29 | |
| 30 | ////////////////////////////////////////////////////////////////////////////// |
| 31 | |
| 32 | SkFilterShader::SkFilterShader(SkShader* shader, SkColorFilter* filter) |
| 33 | { |
| 34 | fShader = shader; shader->ref(); |
| 35 | fFilter = filter; filter->ref(); |
| 36 | } |
| 37 | |
| 38 | SkFilterShader::SkFilterShader(SkFlattenableReadBuffer& buffer) : |
| 39 | INHERITED(buffer) |
| 40 | { |
| 41 | fShader = static_cast<SkShader*>(buffer.readFlattenable()); |
| 42 | fFilter = static_cast<SkColorFilter*>(buffer.readFlattenable()); |
| 43 | } |
| 44 | |
| 45 | SkFilterShader::~SkFilterShader() |
| 46 | { |
| 47 | fFilter->unref(); |
| 48 | fShader->unref(); |
| 49 | } |
| 50 | |
| 51 | void SkFilterShader::beginSession() |
| 52 | { |
| 53 | this->INHERITED::beginSession(); |
| 54 | fShader->beginSession(); |
| 55 | } |
| 56 | |
| 57 | void SkFilterShader::endSession() |
| 58 | { |
| 59 | fShader->endSession(); |
| 60 | this->INHERITED::endSession(); |
| 61 | } |
| 62 | |
| 63 | void SkFilterShader::flatten(SkFlattenableWriteBuffer& buffer) |
| 64 | { |
| 65 | this->INHERITED::flatten(buffer); |
| 66 | buffer.writeFlattenable(fShader); |
| 67 | buffer.writeFlattenable(fFilter); |
| 68 | } |
| 69 | |
| 70 | uint32_t SkFilterShader::getFlags() |
| 71 | { |
| 72 | uint32_t shaderF = fShader->getFlags(); |
| 73 | uint32_t filterF = fFilter->getFlags(); |
| 74 | |
| 75 | // if the filter doesn't support 16bit, clear the matching bit in the shader |
| 76 | if (!(filterF & SkColorFilter::kHasFilter16_Flag)) |
| 77 | shaderF &= ~SkShader::kHasSpan16_Flag; |
| 78 | |
| 79 | // if the filter might change alpha, clear the opaque flag in the shader |
| 80 | if (!(filterF & SkColorFilter::kAlphaUnchanged_Flag)) |
| 81 | shaderF &= ~(SkShader::kOpaqueAlpha_Flag | SkShader::kHasSpan16_Flag); |
| 82 | |
| 83 | return shaderF; |
| 84 | } |
| 85 | |
| 86 | bool SkFilterShader::setContext(const SkBitmap& device, |
| 87 | const SkPaint& paint, |
| 88 | const SkMatrix& matrix) |
| 89 | { |
| 90 | return this->INHERITED::setContext(device, paint, matrix) && |
| 91 | fShader->setContext(device, paint, matrix); |
| 92 | } |
| 93 | |
| 94 | void SkFilterShader::shadeSpan(int x, int y, SkPMColor result[], int count) |
| 95 | { |
| 96 | fShader->shadeSpan(x, y, result, count); |
| 97 | fFilter->filterSpan(result, count, result); |
| 98 | } |
| 99 | |
| 100 | void SkFilterShader::shadeSpan16(int x, int y, uint16_t result[], int count) |
| 101 | { |
| 102 | SkASSERT(fShader->getFlags() & SkShader::kHasSpan16_Flag); |
| 103 | SkASSERT(fFilter->getFlags() & SkColorFilter::kHasFilter16_Flag); |
| 104 | |
| 105 | fShader->shadeSpan16(x, y, result, count); |
| 106 | fFilter->filterSpan16(result, count, result); |
| 107 | } |
| 108 | |