| 1 | // Copyright (C) 2024 The Qt Company Ltd. |
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| 2 | // SPDX-License-Identifier: LicenseRef-Qt-Commercial OR LGPL-3.0-only OR GPL-2.0-only OR GPL-3.0-only |
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| 3 | |
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| 4 | #ifndef QVIDEOFRAMETEXTUREPOOL_P_H |
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| 5 | #define QVIDEOFRAMETEXTUREPOOL_P_H |
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| 6 | |
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| 7 | // |
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| 8 | // W A R N I N G |
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| 9 | // ------------- |
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| 10 | // |
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| 11 | // This file is not part of the Qt API. It exists purely as an |
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| 12 | // implementation detail. This header file may change from version to |
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| 13 | // version without notice, or even be removed. |
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| 14 | // |
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| 15 | // We mean it. |
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| 16 | // |
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| 17 | |
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| 18 | #include "qvideoframe.h" |
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| 19 | #include "qhwvideobuffer_p.h" |
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| 20 | |
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| 21 | #include <array> |
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| 22 | #include <optional> |
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| 23 | |
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| 24 | QT_BEGIN_NAMESPACE |
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| 25 | |
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| 26 | class QRhi; |
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| 27 | class QRhiResourceUpdateBatch; |
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| 28 | |
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| 29 | /** |
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| 30 | * @brief The class QVideoFrameTexturePool stores textures in slots to ensure |
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| 31 | * they are alive during rhi's rendering rounds. |
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| 32 | * Depending on the rhi backend, 1, 2, or 3 rounds are needed |
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| 33 | * to complete the texture presentaton. |
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| 34 | * The strategy of slots filling is based on QRhi::currentFrameSlot results. |
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| 35 | */ |
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| 36 | class Q_MULTIMEDIA_EXPORT QVideoFrameTexturePool { |
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| 37 | static constexpr size_t MaxSlotsCount = 4; |
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| 38 | public: |
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| 39 | /** |
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| 40 | * @brief The flag indicates whether the textures need update. |
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| 41 | * Whenever a new current frame is set, the flag is turning into true. |
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| 42 | */ |
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| 43 | bool texturesDirty() const { return m_texturesDirty; } |
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| 44 | |
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| 45 | const QVideoFrame& currentFrame() const { return m_currentFrame; } |
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| 46 | |
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| 47 | /** |
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| 48 | * @brief The method sets the current frame to be converted into textures. |
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| 49 | * The flag texturesDirty becomes true after setting a new frame. |
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| 50 | */ |
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| 51 | void setCurrentFrame(QVideoFrame frame); |
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| 52 | |
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| 53 | /** |
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| 54 | * @brief The method updates textures basing on the current frame. |
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| 55 | * It's recommended to invoke it during rhi's rendering, |
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| 56 | * in other words, between QRhi::beginFrame and QRhi::endFrame. |
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| 57 | * The method resets texturesDirty to false. |
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| 58 | * |
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| 59 | * @return the pointer to the updated texture or null if failed |
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| 60 | */ |
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| 61 | QVideoFrameTextures* updateTextures(QRhi &rhi, QRhiResourceUpdateBatch &rub); |
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| 62 | |
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| 63 | /** |
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| 64 | * @brief The method should be invoked after finishing QRhi::endFrame. |
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| 65 | * It propagates the call to the current texture in order to |
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| 66 | * free resources that are not needed anymore. |
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| 67 | */ |
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| 68 | void onFrameEndInvoked(); |
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| 69 | |
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| 70 | /** |
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| 71 | * @brief The method clears all texture slots and sets the dirty flag if |
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| 72 | * the current frame is valid. |
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| 73 | */ |
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| 74 | void clearTextures(); |
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| 75 | |
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| 76 | private: |
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| 77 | QVideoFrame m_currentFrame; |
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| 78 | bool m_texturesDirty = false; |
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| 79 | std::array<QVideoFrameTexturesUPtr, MaxSlotsCount> m_textureSlots; |
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| 80 | std::optional<int> m_currentSlot; |
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| 81 | QVideoFrameTexturesUPtr m_oldTextures; |
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| 82 | }; |
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| 83 | |
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| 84 | QT_END_NAMESPACE |
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| 85 | |
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| 86 | #endif // QVIDEOFRAMETEXTUREPOOL_P_H |
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| 87 | |
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