b7f0b9cd5c
Bug: skia:7903 Change-Id: I7301d943b679a4670511b6cf60c594baf615834a Reviewed-on: https://skia-review.googlesource.com/c/164261 Commit-Queue: Jim Van Verth <jvanverth@google.com> Reviewed-by: Brian Salomon <bsalomon@google.com>
63 lines
1.9 KiB
C
63 lines
1.9 KiB
C
/*
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* Copyright 2016 Google Inc.
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*
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* Use of this source code is governed by a BSD-style license that can be
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* found in the LICENSE file.
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*/
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#ifndef SkYUVSizeInfo_DEFINED
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#define SkYUVSizeInfo_DEFINED
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#include "SkImageInfo.h"
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#include "SkSize.h"
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#include "SkYUVAIndex.h"
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struct SkYUVSizeInfo {
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static constexpr auto kMaxCount = 4;
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SkISize fSizes[kMaxCount];
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/**
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* While the widths of the Y, U, V and A planes are not restricted, the
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* implementation often requires that the width of the memory allocated
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* for each plane be a multiple of 8.
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*
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* This struct allows us to inform the client how many "widthBytes"
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* that we need. Note that we use the new idea of "widthBytes"
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* because this idea is distinct from "rowBytes" (used elsewhere in
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* Skia). "rowBytes" allow the last row of the allocation to not
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* include any extra padding, while, in this case, every single row of
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* the allocation must be at least "widthBytes".
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*/
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size_t fWidthBytes[kMaxCount];
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bool operator==(const SkYUVSizeInfo& that) const {
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for (int i = 0; i < kMaxCount; ++i) {
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SkASSERT((!fSizes[i].isEmpty() && fWidthBytes[i]) ||
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(fSizes[i].isEmpty() && !fWidthBytes[i]));
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if (fSizes[i] != that.fSizes[i] || fWidthBytes[i] != that.fWidthBytes[i]) {
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return false;
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}
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}
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return true;
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}
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size_t computeTotalBytes() const {
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size_t totalBytes = 0;
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for (int i = 0; i < kMaxCount; ++i) {
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SkASSERT((!fSizes[i].isEmpty() && fWidthBytes[i]) ||
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(fSizes[i].isEmpty() && !fWidthBytes[i]));
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totalBytes += fWidthBytes[i] * fSizes[i].height();
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}
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return totalBytes;
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}
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void computePlanes(void* base, void* planes[kMaxCount]) const;
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};
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#endif // SkYUVSizeInfo_DEFINED
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