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Patch buffer views.

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This commit is contained in:
Chinmay Garde 2021-06-01 14:05:06 -07:00 committed by Dan Field
parent 47540e614e
commit 070e73868e
2 changed files with 23 additions and 4 deletions
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24
engine/src/flutter/impeller/impeller/compositor/buffer.h
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@ -12,25 +12,39 @@
namespace impeller {
class HostBuffer;
class BufferBase {
public:
~BufferBase() = default;
virtual uint8_t* GetMapping() const = 0;
virtual size_t GetLength() const = 0;
};
class BufferView : public BufferBase {
class BufferView final : public BufferBase {
public:
uint8_t* GetMapping() const {
// |BufferBase|
~BufferView() = default;
// |BufferBase|
uint8_t* GetMapping() const override {
return parent_->GetMapping() + range_in_parent_.offset;
}
size_t GetLength() const { return range_in_parent_.length; }
// |BufferBase|
size_t GetLength() const override { return range_in_parent_.length; }
private:
friend HostBuffer;
std::shared_ptr<BufferBase> parent_;
Range range_in_parent_;
BufferView(std::shared_ptr<BufferBase> parent, Range range_in_parent)
: parent_(std::move(parent)), range_in_parent_(range_in_parent) {}
FML_DISALLOW_COPY_AND_ASSIGN(BufferView);
};
@ -61,10 +75,12 @@ class HostBuffer : public std::enable_shared_from_this<HostBuffer>,
std::shared_ptr<BufferView> Emplace(size_t length);
~HostBuffer();
virtual ~HostBuffer();
// |BufferBase|
uint8_t* GetMapping() const override { return buffer_; }
// |BufferBase|
size_t GetLength() const override { return length_; }
[[nodiscard]] bool Truncate(size_t length);

3
engine/src/flutter/impeller/impeller/compositor/buffer.mm
View File

@ -27,9 +27,12 @@ HostBuffer::~HostBuffer() {
}
std::shared_ptr<BufferView> HostBuffer::Emplace(size_t length) {
auto old_length = length_;
if (!Truncate(length_ + length)) {
return nullptr;
}
return std::shared_ptr<BufferView>(
new BufferView(shared_from_this(), Range{old_length, length}));
}
bool HostBuffer::Truncate(size_t length) {