SkColorFilterImageFilter.cpp revision f3f5bad7ded35265c0b5d042cc4174386b197a33
144888c66d4bf03da58eb9fbd3db92eb477141aabsenorblanco@chromium.org/* 244888c66d4bf03da58eb9fbd3db92eb477141aabsenorblanco@chromium.org * Copyright 2012 The Android Open Source Project 344888c66d4bf03da58eb9fbd3db92eb477141aabsenorblanco@chromium.org * 444888c66d4bf03da58eb9fbd3db92eb477141aabsenorblanco@chromium.org * Use of this source code is governed by a BSD-style license that can be 544888c66d4bf03da58eb9fbd3db92eb477141aabsenorblanco@chromium.org * found in the LICENSE file. 644888c66d4bf03da58eb9fbd3db92eb477141aabsenorblanco@chromium.org */ 744888c66d4bf03da58eb9fbd3db92eb477141aabsenorblanco@chromium.org 844888c66d4bf03da58eb9fbd3db92eb477141aabsenorblanco@chromium.org#include "SkColorFilterImageFilter.h" 944888c66d4bf03da58eb9fbd3db92eb477141aabsenorblanco@chromium.org#include "SkBitmap.h" 1044888c66d4bf03da58eb9fbd3db92eb477141aabsenorblanco@chromium.org#include "SkCanvas.h" 118d21f6c7a9d0cf4f87d77c235c6da7203620c7e5senorblanco@chromium.org#include "SkColorMatrixFilter.h" 1244888c66d4bf03da58eb9fbd3db92eb477141aabsenorblanco@chromium.org#include "SkDevice.h" 1344888c66d4bf03da58eb9fbd3db92eb477141aabsenorblanco@chromium.org#include "SkColorFilter.h" 148b0e8ac5f582de80356019406e2975079bf0829dcommit-bot@chromium.org#include "SkReadBuffer.h" 158b0e8ac5f582de80356019406e2975079bf0829dcommit-bot@chromium.org#include "SkWriteBuffer.h" 1644888c66d4bf03da58eb9fbd3db92eb477141aabsenorblanco@chromium.org 178d21f6c7a9d0cf4f87d77c235c6da7203620c7e5senorblanco@chromium.orgnamespace { 188d21f6c7a9d0cf4f87d77c235c6da7203620c7e5senorblanco@chromium.org 198d21f6c7a9d0cf4f87d77c235c6da7203620c7e5senorblanco@chromium.orgvoid mult_color_matrix(SkScalar a[20], SkScalar b[20], SkScalar out[20]) { 208d21f6c7a9d0cf4f87d77c235c6da7203620c7e5senorblanco@chromium.org for (int j = 0; j < 4; ++j) { 218d21f6c7a9d0cf4f87d77c235c6da7203620c7e5senorblanco@chromium.org for (int i = 0; i < 5; ++i) { 228d21f6c7a9d0cf4f87d77c235c6da7203620c7e5senorblanco@chromium.org out[i+j*5] = 4 == i ? a[4+j*5] : 0; 238d21f6c7a9d0cf4f87d77c235c6da7203620c7e5senorblanco@chromium.org for (int k = 0; k < 4; ++k) 248d21f6c7a9d0cf4f87d77c235c6da7203620c7e5senorblanco@chromium.org out[i+j*5] += SkScalarMul(a[k+j*5], b[i+k*5]); 258d21f6c7a9d0cf4f87d77c235c6da7203620c7e5senorblanco@chromium.org } 268d21f6c7a9d0cf4f87d77c235c6da7203620c7e5senorblanco@chromium.org } 278d21f6c7a9d0cf4f87d77c235c6da7203620c7e5senorblanco@chromium.org} 288d21f6c7a9d0cf4f87d77c235c6da7203620c7e5senorblanco@chromium.org 298d21f6c7a9d0cf4f87d77c235c6da7203620c7e5senorblanco@chromium.org// To detect if we need to apply clamping after applying a matrix, we check if 308d21f6c7a9d0cf4f87d77c235c6da7203620c7e5senorblanco@chromium.org// any output component might go outside of [0, 255] for any combination of 318d21f6c7a9d0cf4f87d77c235c6da7203620c7e5senorblanco@chromium.org// input components in [0..255]. 328d21f6c7a9d0cf4f87d77c235c6da7203620c7e5senorblanco@chromium.org// Each output component is an affine transformation of the input component, so 338d21f6c7a9d0cf4f87d77c235c6da7203620c7e5senorblanco@chromium.org// the minimum and maximum values are for any combination of minimum or maximum 348d21f6c7a9d0cf4f87d77c235c6da7203620c7e5senorblanco@chromium.org// values of input components (i.e. 0 or 255). 358d21f6c7a9d0cf4f87d77c235c6da7203620c7e5senorblanco@chromium.org// E.g. if R' = x*R + y*G + z*B + w*A + t 368d21f6c7a9d0cf4f87d77c235c6da7203620c7e5senorblanco@chromium.org// Then the maximum value will be for R=255 if x>0 or R=0 if x<0, and the 378d21f6c7a9d0cf4f87d77c235c6da7203620c7e5senorblanco@chromium.org// minimum value will be for R=0 if x>0 or R=255 if x<0. 388d21f6c7a9d0cf4f87d77c235c6da7203620c7e5senorblanco@chromium.org// Same goes for all components. 398d21f6c7a9d0cf4f87d77c235c6da7203620c7e5senorblanco@chromium.orgbool component_needs_clamping(SkScalar row[5]) { 408d21f6c7a9d0cf4f87d77c235c6da7203620c7e5senorblanco@chromium.org SkScalar maxValue = row[4] / 255; 418d21f6c7a9d0cf4f87d77c235c6da7203620c7e5senorblanco@chromium.org SkScalar minValue = row[4] / 255; 428d21f6c7a9d0cf4f87d77c235c6da7203620c7e5senorblanco@chromium.org for (int i = 0; i < 4; ++i) { 438d21f6c7a9d0cf4f87d77c235c6da7203620c7e5senorblanco@chromium.org if (row[i] > 0) 448d21f6c7a9d0cf4f87d77c235c6da7203620c7e5senorblanco@chromium.org maxValue += row[i]; 458d21f6c7a9d0cf4f87d77c235c6da7203620c7e5senorblanco@chromium.org else 468d21f6c7a9d0cf4f87d77c235c6da7203620c7e5senorblanco@chromium.org minValue += row[i]; 478d21f6c7a9d0cf4f87d77c235c6da7203620c7e5senorblanco@chromium.org } 488d21f6c7a9d0cf4f87d77c235c6da7203620c7e5senorblanco@chromium.org return (maxValue > 1) || (minValue < 0); 498d21f6c7a9d0cf4f87d77c235c6da7203620c7e5senorblanco@chromium.org} 508d21f6c7a9d0cf4f87d77c235c6da7203620c7e5senorblanco@chromium.org 518d21f6c7a9d0cf4f87d77c235c6da7203620c7e5senorblanco@chromium.orgbool matrix_needs_clamping(SkScalar matrix[20]) { 528d21f6c7a9d0cf4f87d77c235c6da7203620c7e5senorblanco@chromium.org return component_needs_clamping(matrix) 538d21f6c7a9d0cf4f87d77c235c6da7203620c7e5senorblanco@chromium.org || component_needs_clamping(matrix+5) 548d21f6c7a9d0cf4f87d77c235c6da7203620c7e5senorblanco@chromium.org || component_needs_clamping(matrix+10) 558d21f6c7a9d0cf4f87d77c235c6da7203620c7e5senorblanco@chromium.org || component_needs_clamping(matrix+15); 568d21f6c7a9d0cf4f87d77c235c6da7203620c7e5senorblanco@chromium.org} 578d21f6c7a9d0cf4f87d77c235c6da7203620c7e5senorblanco@chromium.org 588d21f6c7a9d0cf4f87d77c235c6da7203620c7e5senorblanco@chromium.org}; 598d21f6c7a9d0cf4f87d77c235c6da7203620c7e5senorblanco@chromium.org 60cd9f55989e680b7f52fa21766dde0ac67ac9911fsenorblanco@chromium.orgSkColorFilterImageFilter* SkColorFilterImageFilter::Create(SkColorFilter* cf, 615e5f948b6b363dbfc8c076d8ff0c6b8e9ea99958senorblanco SkImageFilter* input, const CropRect* cropRect, uint32_t uniqueID) { 62cd9f55989e680b7f52fa21766dde0ac67ac9911fsenorblanco@chromium.org SkASSERT(cf); 639bde31e95ddd82a4a923275bb01265740407dab1sugoi if (NULL == cf) { 649bde31e95ddd82a4a923275bb01265740407dab1sugoi return NULL; 659bde31e95ddd82a4a923275bb01265740407dab1sugoi } 66cd9f55989e680b7f52fa21766dde0ac67ac9911fsenorblanco@chromium.org SkScalar colorMatrix[20], inputMatrix[20]; 67cd9f55989e680b7f52fa21766dde0ac67ac9911fsenorblanco@chromium.org SkColorFilter* inputColorFilter; 68cd9f55989e680b7f52fa21766dde0ac67ac9911fsenorblanco@chromium.org if (input && cf->asColorMatrix(colorMatrix) 69a1c511b8704c6c266b90860a4c68f30ca7514f9bsugoi@google.com && input->asColorFilter(&inputColorFilter) 7049f085dddff10473b6ebf832a974288300224e60bsalomon && (inputColorFilter)) { 71a1c511b8704c6c266b90860a4c68f30ca7514f9bsugoi@google.com SkAutoUnref autoUnref(inputColorFilter); 72a1c511b8704c6c266b90860a4c68f30ca7514f9bsugoi@google.com if (inputColorFilter->asColorMatrix(inputMatrix) && !matrix_needs_clamping(inputMatrix)) { 73a1c511b8704c6c266b90860a4c68f30ca7514f9bsugoi@google.com SkScalar combinedMatrix[20]; 743df05015efce95c306fb79c21efc77c79f1ac1basenorblanco mult_color_matrix(colorMatrix, inputMatrix, combinedMatrix); 75727a352f7412753d2a3e4d30eab6500a1a4de135commit-bot@chromium.org SkAutoTUnref<SkColorFilter> newCF(SkColorMatrixFilter::Create(combinedMatrix)); 765e5f948b6b363dbfc8c076d8ff0c6b8e9ea99958senorblanco return SkNEW_ARGS(SkColorFilterImageFilter, (newCF, input->getInput(0), cropRect, 0)); 77a1c511b8704c6c266b90860a4c68f30ca7514f9bsugoi@google.com } 78cd9f55989e680b7f52fa21766dde0ac67ac9911fsenorblanco@chromium.org } 795e5f948b6b363dbfc8c076d8ff0c6b8e9ea99958senorblanco return SkNEW_ARGS(SkColorFilterImageFilter, (cf, input, cropRect, uniqueID)); 80cd9f55989e680b7f52fa21766dde0ac67ac9911fsenorblanco@chromium.org} 81cd9f55989e680b7f52fa21766dde0ac67ac9911fsenorblanco@chromium.org 82194d775edcf5fa6e82098a97ad53018d70db1155senorblanco@chromium.orgSkColorFilterImageFilter::SkColorFilterImageFilter(SkColorFilter* cf, 835e5f948b6b363dbfc8c076d8ff0c6b8e9ea99958senorblanco SkImageFilter* input, const CropRect* cropRect, uint32_t uniqueID) 849bde31e95ddd82a4a923275bb01265740407dab1sugoi : INHERITED(1, &input, cropRect, uniqueID), fColorFilter(SkRef(cf)) { 8544888c66d4bf03da58eb9fbd3db92eb477141aabsenorblanco@chromium.org} 8644888c66d4bf03da58eb9fbd3db92eb477141aabsenorblanco@chromium.org 879fa60daad4d5f54c0dbe3dbcc7608a8f6d721187reedSkFlattenable* SkColorFilterImageFilter::CreateProc(SkReadBuffer& buffer) { 889fa60daad4d5f54c0dbe3dbcc7608a8f6d721187reed SK_IMAGEFILTER_UNFLATTEN_COMMON(common, 1); 89f0f6c405fe9646be224128fc1dd24c7fc15246efreed SkAutoTUnref<SkColorFilter> cf(buffer.readColorFilter()); 905e5f948b6b363dbfc8c076d8ff0c6b8e9ea99958senorblanco return Create(cf, common.getInput(0), &common.cropRect(), common.uniqueID()); 919fa60daad4d5f54c0dbe3dbcc7608a8f6d721187reed} 9244888c66d4bf03da58eb9fbd3db92eb477141aabsenorblanco@chromium.org 938b0e8ac5f582de80356019406e2975079bf0829dcommit-bot@chromium.orgvoid SkColorFilterImageFilter::flatten(SkWriteBuffer& buffer) const { 9444888c66d4bf03da58eb9fbd3db92eb477141aabsenorblanco@chromium.org this->INHERITED::flatten(buffer); 9544888c66d4bf03da58eb9fbd3db92eb477141aabsenorblanco@chromium.org buffer.writeFlattenable(fColorFilter); 9644888c66d4bf03da58eb9fbd3db92eb477141aabsenorblanco@chromium.org} 9744888c66d4bf03da58eb9fbd3db92eb477141aabsenorblanco@chromium.org 9844888c66d4bf03da58eb9fbd3db92eb477141aabsenorblanco@chromium.orgSkColorFilterImageFilter::~SkColorFilterImageFilter() { 999bde31e95ddd82a4a923275bb01265740407dab1sugoi fColorFilter->unref(); 10044888c66d4bf03da58eb9fbd3db92eb477141aabsenorblanco@chromium.org} 10144888c66d4bf03da58eb9fbd3db92eb477141aabsenorblanco@chromium.org 10244888c66d4bf03da58eb9fbd3db92eb477141aabsenorblanco@chromium.orgbool SkColorFilterImageFilter::onFilterImage(Proxy* proxy, const SkBitmap& source, 1034cb543d6057b692e1099e9f115155f0bf323a0c8senorblanco@chromium.org const Context& ctx, 10444888c66d4bf03da58eb9fbd3db92eb477141aabsenorblanco@chromium.org SkBitmap* result, 105ae761f7545d8ebf181d220169afac2056b057b8ccommit-bot@chromium.org SkIPoint* offset) const { 10668400767be5f72e4b9750ccc8bcf0078d42869a7senorblanco@chromium.org SkBitmap src = source; 1076776b82d466fa93ccffd251fdf556fe058395444senorblanco@chromium.org SkIPoint srcOffset = SkIPoint::Make(0, 0); 1084cb543d6057b692e1099e9f115155f0bf323a0c8senorblanco@chromium.org if (getInput(0) && !getInput(0)->filterImage(proxy, source, ctx, &src, &srcOffset)) { 10968400767be5f72e4b9750ccc8bcf0078d42869a7senorblanco@chromium.org return false; 11068400767be5f72e4b9750ccc8bcf0078d42869a7senorblanco@chromium.org } 11168400767be5f72e4b9750ccc8bcf0078d42869a7senorblanco@chromium.org 112194d775edcf5fa6e82098a97ad53018d70db1155senorblanco@chromium.org SkIRect bounds; 113118252962f89a80db661a0544f1bd61cbaab6321senorblanco@chromium.org if (!this->applyCropRect(ctx, src, srcOffset, &bounds)) { 114194d775edcf5fa6e82098a97ad53018d70db1155senorblanco@chromium.org return false; 115194d775edcf5fa6e82098a97ad53018d70db1155senorblanco@chromium.org } 116194d775edcf5fa6e82098a97ad53018d70db1155senorblanco@chromium.org 1171f2f338e23789f3eef168dcbd8171a28820ba6c1robertphillips@google.com SkAutoTUnref<SkBaseDevice> device(proxy->createDevice(bounds.width(), bounds.height())); 118cd3b15ca6364a04b0eeeb4f89c7daa8aefe854c8commit-bot@chromium.org if (NULL == device.get()) { 119cd3b15ca6364a04b0eeeb4f89c7daa8aefe854c8commit-bot@chromium.org return false; 120cd3b15ca6364a04b0eeeb4f89c7daa8aefe854c8commit-bot@chromium.org } 12144888c66d4bf03da58eb9fbd3db92eb477141aabsenorblanco@chromium.org SkCanvas canvas(device.get()); 12244888c66d4bf03da58eb9fbd3db92eb477141aabsenorblanco@chromium.org SkPaint paint; 12344888c66d4bf03da58eb9fbd3db92eb477141aabsenorblanco@chromium.org 12444888c66d4bf03da58eb9fbd3db92eb477141aabsenorblanco@chromium.org paint.setXfermodeMode(SkXfermode::kSrc_Mode); 125cd9f55989e680b7f52fa21766dde0ac67ac9911fsenorblanco@chromium.org paint.setColorFilter(fColorFilter); 1266776b82d466fa93ccffd251fdf556fe058395444senorblanco@chromium.org canvas.drawSprite(src, srcOffset.fX - bounds.fLeft, srcOffset.fY - bounds.fTop, &paint); 12744888c66d4bf03da58eb9fbd3db92eb477141aabsenorblanco@chromium.org 12844888c66d4bf03da58eb9fbd3db92eb477141aabsenorblanco@chromium.org *result = device.get()->accessBitmap(false); 1296776b82d466fa93ccffd251fdf556fe058395444senorblanco@chromium.org offset->fX = bounds.fLeft; 1306776b82d466fa93ccffd251fdf556fe058395444senorblanco@chromium.org offset->fY = bounds.fTop; 13144888c66d4bf03da58eb9fbd3db92eb477141aabsenorblanco@chromium.org return true; 13244888c66d4bf03da58eb9fbd3db92eb477141aabsenorblanco@chromium.org} 1338d21f6c7a9d0cf4f87d77c235c6da7203620c7e5senorblanco@chromium.org 134a1c511b8704c6c266b90860a4c68f30ca7514f9bsugoi@google.combool SkColorFilterImageFilter::asColorFilter(SkColorFilter** filter) const { 135b295fb6ff3222453912dfcb7a1ea5184d40014b5senorblanco@chromium.org if (!cropRectIsSet()) { 136194d775edcf5fa6e82098a97ad53018d70db1155senorblanco@chromium.org if (filter) { 137194d775edcf5fa6e82098a97ad53018d70db1155senorblanco@chromium.org *filter = fColorFilter; 138194d775edcf5fa6e82098a97ad53018d70db1155senorblanco@chromium.org fColorFilter->ref(); 139194d775edcf5fa6e82098a97ad53018d70db1155senorblanco@chromium.org } 140194d775edcf5fa6e82098a97ad53018d70db1155senorblanco@chromium.org return true; 141a1c511b8704c6c266b90860a4c68f30ca7514f9bsugoi@google.com } 142194d775edcf5fa6e82098a97ad53018d70db1155senorblanco@chromium.org return false; 1438d21f6c7a9d0cf4f87d77c235c6da7203620c7e5senorblanco@chromium.org} 144f3f5bad7ded35265c0b5d042cc4174386b197a33robertphillips 145f3f5bad7ded35265c0b5d042cc4174386b197a33robertphillips#ifndef SK_IGNORE_TO_STRING 146f3f5bad7ded35265c0b5d042cc4174386b197a33robertphillipsvoid SkColorFilterImageFilter::toString(SkString* str) const { 147f3f5bad7ded35265c0b5d042cc4174386b197a33robertphillips str->appendf("SkColorFilterImageFilter: ("); 148f3f5bad7ded35265c0b5d042cc4174386b197a33robertphillips 149f3f5bad7ded35265c0b5d042cc4174386b197a33robertphillips str->appendf("color filter: "); 150f3f5bad7ded35265c0b5d042cc4174386b197a33robertphillips fColorFilter->toString(str); 151f3f5bad7ded35265c0b5d042cc4174386b197a33robertphillips 152f3f5bad7ded35265c0b5d042cc4174386b197a33robertphillips str->append(")"); 153f3f5bad7ded35265c0b5d042cc4174386b197a33robertphillips} 154f3f5bad7ded35265c0b5d042cc4174386b197a33robertphillips#endif 155