From ad38bc6ecb80ddeb562841b33258dd53659b1da6 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?J=C3=B6rg=20Frings-F=C3=BCrst?= <debian@jff-webhosting.net>
Date: Mon, 24 Aug 2020 18:44:51 +0200
Subject: New upstream version 1.0.31

---
 backend/genesys/image_buffer.h | 65 +++++++++---------------------------------
 1 file changed, 13 insertions(+), 52 deletions(-)

(limited to 'backend/genesys/image_buffer.h')

diff --git a/backend/genesys/image_buffer.h b/backend/genesys/image_buffer.h
index 43c3eb7..1910244 100644
--- a/backend/genesys/image_buffer.h
+++ b/backend/genesys/image_buffer.h
@@ -56,72 +56,33 @@ class ImageBuffer
 {
 public:
     using ProducerCallback = std::function<bool(std::size_t size, std::uint8_t* out_data)>;
+    static constexpr std::uint64_t BUFFER_SIZE_UNSET = std::numeric_limits<std::uint64_t>::max();
 
     ImageBuffer() {}
     ImageBuffer(std::size_t size, ProducerCallback producer);
 
-    std::size_t size() const { return size_; }
-    std::size_t available() const { return size_ - buffer_offset_; }
+    std::size_t available() const { return curr_size_ - buffer_offset_; }
 
-    bool get_data(std::size_t size, std::uint8_t* out_data);
-
-private:
-    ProducerCallback producer_;
-    std::size_t size_ = 0;
-
-    std::size_t buffer_offset_ = 0;
-    std::vector<std::uint8_t> buffer_;
-};
-
-class FakeBufferModel
-{
-public:
-    FakeBufferModel() {}
-
-    void push_step(std::size_t buffer_size, std::size_t row_bytes);
-
-    std::size_t available_space() const;
-
-    void simulate_read(std::size_t size);
+    // allows adjusting the amount of data left so that we don't do a full size read from the
+    // producer on the last iteration. Set to BUFFER_SIZE_UNSET to ignore buffer size.
+    std::uint64_t remaining_size() const { return remaining_size_; }
+    void set_remaining_size(std::uint64_t bytes) { remaining_size_ = bytes; }
 
-private:
-    std::vector<std::size_t> sizes_;
-    std::vector<std::size_t> available_sizes_;
-    std::vector<std::size_t> row_bytes_;
-};
-
-// This class is similar to ImageBuffer, but preserves historical peculiarities of buffer handling
-// in the backend to preserve exact behavior
-class ImageBufferGenesysUsb
-{
-public:
-    using ProducerCallback = std::function<void(std::size_t size, std::uint8_t* out_data)>;
-
-    ImageBufferGenesysUsb() {}
-    ImageBufferGenesysUsb(std::size_t total_size, const FakeBufferModel& buffer_model,
-                          ProducerCallback producer);
-
-    std::size_t remaining_size() const { return remaining_size_; }
-
-    void set_remaining_size(std::size_t bytes) { remaining_size_ = bytes; }
-
-    std::size_t available() const { return buffer_end_ - buffer_offset_; }
+    // May be used to force the last read to be rounded up of a certain number of bytes
+    void set_last_read_multiple(std::uint64_t bytes) { last_read_multiple_ = bytes; }
 
     bool get_data(std::size_t size, std::uint8_t* out_data);
 
 private:
+    ProducerCallback producer_;
+    std::size_t size_ = 0;
+    std::size_t curr_size_ = 0;
 
-    std::size_t get_read_size();
-
-    std::size_t remaining_size_ = 0;
+    std::uint64_t remaining_size_ = BUFFER_SIZE_UNSET;
+    std::uint64_t last_read_multiple_ = BUFFER_SIZE_UNSET;
 
     std::size_t buffer_offset_ = 0;
-    std::size_t buffer_end_ = 0;
     std::vector<std::uint8_t> buffer_;
-
-    FakeBufferModel buffer_model_;
-
-    ProducerCallback producer_;
 };
 
 } // namespace genesys
-- 
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