mirror of
https://github.com/TomHarte/CLK.git
synced 2024-11-23 03:32:32 +00:00
Simplifies semantics a little and starts accepting a single buffer of pixel data.
This commit is contained in:
Thomas Harte
parent
9799aa0975
commit
55da1e9c0f
@ -47,7 +47,7 @@ VideoOutput::VideoOutput(uint8_t *memory, Outputs::Display::ScanTarget *scan_tar
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crt_cycles_per_line,
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1,
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Outputs::Display::Type::PAL50,
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Outputs::Display::ScanTarget::Modals::DataType::Red1Green1Blue1,
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Outputs::Display::InputDataType::Red1Green1Blue1,
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scan_target));
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// crt_->set_rgb_sampling_function(
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@ -23,7 +23,7 @@ const std::size_t StandardAllocationSize = 320;
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}
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Video::Video(Outputs::Display::ScanTarget *scan_target) :
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crt_(new Outputs::CRT::CRT(207 * 2, 1, Outputs::Display::Type::PAL50, Outputs::Display::ScanTarget::Modals::DataType::Luminance1, scan_target))
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crt_(new Outputs::CRT::CRT(207 * 2, 1, Outputs::Display::Type::PAL50, Outputs::Display::InputDataType::Luminance1, scan_target))
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{
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// Set a composite sampling function that assumes two-level input; either a byte is 0, which is black,
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@ -613,6 +613,12 @@
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@ -856,8 +862,6 @@
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@ -1322,8 +1326,6 @@
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@ -1333,14 +1335,7 @@
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@ -1349,17 +1344,11 @@
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@ -1372,6 +1361,25 @@
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@ -1774,6 +1782,7 @@
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@ -2923,20 +2932,8 @@
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@ -2950,19 +2947,6 @@
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@ -3036,6 +3020,41 @@
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|
||||
4BD191E4219113B80042E144 /* OutputShader.hpp */,
|
||||
4BD191E5219113B80042E144 /* Shader.hpp */,
|
||||
);
|
||||
path = Shaders;
|
||||
sourceTree = "<group>";
|
||||
};
|
||||
4BD388431FE34E060042B588 /* Implementation */ = {
|
||||
isa = PBXGroup;
|
||||
children = (
|
||||
@ -3676,8 +3695,10 @@
|
||||
4B89451B201967B4007DE474 /* ConfidenceSummary.cpp in Sources */,
|
||||
4B1B88C1202E3DB200B67DFF /* MultiConfigurable.cpp in Sources */,
|
||||
4B055AA31FAE85DF0060FFFF /* ImplicitSectors.cpp in Sources */,
|
||||
4BD191F1219117FA0042E144 /* Rectangle.cpp in Sources */,
|
||||
4B055AAE1FAE85FD0060FFFF /* TrackSerialiser.cpp in Sources */,
|
||||
4B89452B201967B4007DE474 /* File.cpp in Sources */,
|
||||
4BD191F6219118390042E144 /* Shader.cpp in Sources */,
|
||||
4B055A981FAE85C50060FFFF /* Drive.cpp in Sources */,
|
||||
4B4B1A3D200198CA00A0F866 /* KonamiSCC.cpp in Sources */,
|
||||
4B055AC31FAE9AE80060FFFF /* AmstradCPC.cpp in Sources */,
|
||||
@ -3761,6 +3782,7 @@
|
||||
4B894537201967B4007DE474 /* Z80.cpp in Sources */,
|
||||
4B055A9F1FAE85DA0060FFFF /* HFE.cpp in Sources */,
|
||||
4B07835B1FC11D42001D12BB /* Configurable.cpp in Sources */,
|
||||
4BD191F52191180E0042E144 /* ScanTarget.cpp in Sources */,
|
||||
4B894523201967B4007DE474 /* StaticAnalyser.cpp in Sources */,
|
||||
4B055AEC1FAE9BA20060FFFF /* Z80Base.cpp in Sources */,
|
||||
4B0F94FF208C1A1600FE41D9 /* NIB.cpp in Sources */,
|
||||
@ -3826,11 +3848,13 @@
|
||||
4BBFFEE61F7B27F1005F3FEB /* TrackSerialiser.cpp in Sources */,
|
||||
4BAE49582032881E004BE78E /* CSZX8081.mm in Sources */,
|
||||
4B0333AF2094081A0050B93D /* AppleDSK.cpp in Sources */,
|
||||
4BD191F72191183A0042E144 /* Shader.cpp in Sources */,
|
||||
4B894518201967B4007DE474 /* ConfidenceCounter.cpp in Sources */,
|
||||
4B89452E201967B4007DE474 /* StaticAnalyser.cpp in Sources */,
|
||||
4B38F3481F2EC11D00D9235D /* AmstradCPC.cpp in Sources */,
|
||||
4B8FE2221DA19FB20090D3CE /* MachinePanel.swift in Sources */,
|
||||
4B4518A41F75FD1C00926311 /* OricMFMDSK.cpp in Sources */,
|
||||
4BD191F0219117F90042E144 /* Rectangle.cpp in Sources */,
|
||||
4B4B1A3C200198CA00A0F866 /* KonamiSCC.cpp in Sources */,
|
||||
4BB0A65B2044FD3000FB3688 /* SN76489.cpp in Sources */,
|
||||
4BD5F1951D13528900631CD1 /* CSBestEffortUpdater.mm in Sources */,
|
||||
@ -3864,6 +3888,7 @@
|
||||
4B4518851F75E91A00926311 /* DiskController.cpp in Sources */,
|
||||
4B8334841F5DA0360097E338 /* Z80Storage.cpp in Sources */,
|
||||
4BA61EB01D91515900B3C876 /* NSData+StdVector.mm in Sources */,
|
||||
4BD191F42191180E0042E144 /* ScanTarget.cpp in Sources */,
|
||||
4B0F94FE208C1A1600FE41D9 /* NIB.cpp in Sources */,
|
||||
4B89452A201967B4007DE474 /* File.cpp in Sources */,
|
||||
4B4DC8211D2C2425003C5BF8 /* Vic20.cpp in Sources */,
|
||||
|
||||
@ -29,7 +29,7 @@
|
||||
#import <OpenGL/OpenGL.h>
|
||||
#include <OpenGL/gl3.h>
|
||||
|
||||
#include "ScanTarget.hpp"
|
||||
#include "../../../../Outputs/OpenGL/ScanTarget.hpp"
|
||||
|
||||
@interface CSMachine() <CSFastLoading>
|
||||
- (void)speaker:(Outputs::Speaker::Speaker *)speaker didCompleteSamples:(const int16_t *)samples length:(int)length;
|
||||
@ -73,31 +73,43 @@ struct ActivityObserver: public Activity::Observer {
|
||||
__unsafe_unretained CSMachine *machine;
|
||||
};
|
||||
|
||||
class ScanTarget: public Outputs::Display::ScanTarget {
|
||||
public:
|
||||
void set_modals(Modals m) {
|
||||
modals_ = m;
|
||||
}
|
||||
|
||||
Scan *get_scan() {
|
||||
scans_.emplace_back();
|
||||
return &scans_.back();
|
||||
}
|
||||
|
||||
uint8_t *allocate_write_area(size_t required_length, size_t required_alignment) {
|
||||
write_area_.resize(required_length);
|
||||
return write_area_.data();
|
||||
}
|
||||
|
||||
void submit(bool only_if_no_allocation_failures) {
|
||||
scans_.clear();
|
||||
}
|
||||
|
||||
private:
|
||||
std::vector<Scan> scans_;
|
||||
std::vector<uint8_t> write_area_;
|
||||
Modals modals_;
|
||||
};
|
||||
//class ScanTarget: public Outputs::Display::ScanTarget {
|
||||
// public:
|
||||
// void set_modals(Modals m) {
|
||||
// modals_ = m;
|
||||
// }
|
||||
//
|
||||
// Scan *get_scan() {
|
||||
// scans_.emplace_back();
|
||||
// return &scans_.back();
|
||||
// }
|
||||
//
|
||||
// uint8_t *allocate_write_area(size_t required_length, size_t required_alignment) {
|
||||
// write_area_.resize(required_length);
|
||||
// return write_area_.data();
|
||||
// }
|
||||
//
|
||||
// void submit(bool only_if_no_allocation_failures) {
|
||||
// for(const auto &scan: scans_) {
|
||||
// printf("%0.2f %0.2f [%0.2f] -> %0.2f %0.2f [%0.2f] => %0.2f\n",
|
||||
// float(scan.end_points[0].x) / float(modals_.output_scale.x),
|
||||
// float(scan.end_points[0].y) / float(modals_.output_scale.y),
|
||||
// float(scan.end_points[0].composite_angle) / 64.0f,
|
||||
// float(scan.end_points[1].x) / float(modals_.output_scale.x),
|
||||
// float(scan.end_points[1].y) / float(modals_.output_scale.y),
|
||||
// float(scan.end_points[1].composite_angle) / 64.0f,
|
||||
// (float(scan.end_points[1].composite_angle - scan.end_points[0].composite_angle) / 64.0f) / (float(scan.end_points[1].x - scan.end_points[0].x) / float(modals_.output_scale.x))
|
||||
// );
|
||||
// }
|
||||
//
|
||||
// scans_.clear();
|
||||
// }
|
||||
//
|
||||
// private:
|
||||
// std::vector<Scan> scans_;
|
||||
// std::vector<uint8_t> write_area_;
|
||||
// Modals modals_;
|
||||
//};
|
||||
|
||||
@implementation CSMachine {
|
||||
SpeakerDelegate _speakerDelegate;
|
||||
@ -112,7 +124,7 @@ class ScanTarget: public Outputs::Display::ScanTarget {
|
||||
std::bitset<65536> _depressedKeys;
|
||||
NSMutableArray<NSString *> *_leds;
|
||||
|
||||
ScanTarget _scanTarget;
|
||||
Outputs::Display::OpenGL::ScanTarget _scanTarget;
|
||||
}
|
||||
|
||||
- (instancetype)initWithAnalyser:(CSStaticAnalyser *)result {
|
||||
|
||||
@ -65,8 +65,8 @@ void CRT::set_new_timing(int cycles_per_line, int height_of_display, Outputs::Di
|
||||
scan_target_->set_modals(scan_target_modals_);
|
||||
}
|
||||
|
||||
void CRT::set_new_data_type(Outputs::Display::ScanTarget::Modals::DataType data_type) {
|
||||
scan_target_modals_.source_data_type = data_type;
|
||||
void CRT::set_new_data_type(Outputs::Display::InputDataType data_type) {
|
||||
scan_target_modals_.input_data_type = data_type;
|
||||
scan_target_->set_modals(scan_target_modals_);
|
||||
}
|
||||
|
||||
@ -109,10 +109,10 @@ CRT::CRT( int cycles_per_line,
|
||||
int colour_cycle_numerator, int colour_cycle_denominator,
|
||||
int vertical_sync_half_lines,
|
||||
bool should_alternate,
|
||||
Outputs::Display::ScanTarget::Modals::DataType data_type,
|
||||
Outputs::Display::InputDataType data_type,
|
||||
Outputs::Display::ScanTarget *scan_target) {
|
||||
scan_target_ = scan_target;
|
||||
scan_target_modals_.source_data_type = data_type;
|
||||
scan_target_modals_.input_data_type = data_type;
|
||||
scan_target_modals_.cycles_per_line = cycles_per_line;
|
||||
scan_target_modals_.clocks_per_pixel_greatest_common_divisor = clocks_per_pixel_greatest_common_divisor;
|
||||
set_new_timing(cycles_per_line, height_of_display, colour_space, colour_cycle_numerator, colour_cycle_denominator, vertical_sync_half_lines, should_alternate);
|
||||
@ -121,10 +121,10 @@ CRT::CRT( int cycles_per_line,
|
||||
CRT::CRT( int cycles_per_line,
|
||||
int clocks_per_pixel_greatest_common_divisor,
|
||||
Outputs::Display::Type display_type,
|
||||
Outputs::Display::ScanTarget::Modals::DataType data_type,
|
||||
Outputs::Display::InputDataType data_type,
|
||||
Outputs::Display::ScanTarget *scan_target) {
|
||||
scan_target_ = scan_target;
|
||||
scan_target_modals_.source_data_type = data_type;
|
||||
scan_target_modals_.input_data_type = data_type;
|
||||
scan_target_modals_.cycles_per_line = cycles_per_line;
|
||||
scan_target_modals_.clocks_per_pixel_greatest_common_divisor = clocks_per_pixel_greatest_common_divisor;
|
||||
set_new_display_type(cycles_per_line, display_type);
|
||||
|
||||
@ -118,7 +118,7 @@ class CRT {
|
||||
int colour_cycle_denominator,
|
||||
int vertical_sync_half_lines,
|
||||
bool should_alternate,
|
||||
Outputs::Display::ScanTarget::Modals::DataType data_type,
|
||||
Outputs::Display::InputDataType data_type,
|
||||
Outputs::Display::ScanTarget *scan_target);
|
||||
|
||||
/*! Exactly identical to calling the designated constructor with colour subcarrier information
|
||||
@ -127,7 +127,7 @@ class CRT {
|
||||
CRT(int cycles_per_line,
|
||||
int minimum_cycles_per_pixel,
|
||||
Outputs::Display::Type display_type,
|
||||
Outputs::Display::ScanTarget::Modals::DataType data_type,
|
||||
Outputs::Display::InputDataType data_type,
|
||||
Outputs::Display::ScanTarget *scan_target);
|
||||
|
||||
/*! Resets the CRT with new timing information. The CRT then continues as though the new timing had
|
||||
@ -149,7 +149,7 @@ class CRT {
|
||||
|
||||
/*! Changes the type of data being supplied as input.
|
||||
*/
|
||||
void set_new_data_type(Outputs::Display::ScanTarget::Modals::DataType data_type);
|
||||
void set_new_data_type(Outputs::Display::InputDataType data_type);
|
||||
|
||||
/*! Output at the sync level.
|
||||
|
||||
|
||||
93
Outputs/OpenGL/ScanTarget.cpp
Normal file
93
Outputs/OpenGL/ScanTarget.cpp
Normal file
@ -0,0 +1,93 @@
|
||||
//
|
||||
// ScanTarget.cpp
|
||||
// Clock Signal
|
||||
//
|
||||
// Created by Thomas Harte on 05/11/2018.
|
||||
// Copyright © 2018 Thomas Harte. All rights reserved.
|
||||
//
|
||||
|
||||
#include "ScanTarget.hpp"
|
||||
|
||||
using namespace Outputs::Display::OpenGL;
|
||||
|
||||
namespace {
|
||||
|
||||
const int WriteAreaWidth = 2048;
|
||||
const int WriteAreaHeight = 2048;
|
||||
|
||||
}
|
||||
|
||||
void ScanTarget::set_modals(Modals modals) {
|
||||
// TODO: consider resizing the write_area_texture_, and setting
|
||||
// write_area_texture_line_length_ appropriately.
|
||||
modals_ = modals;
|
||||
|
||||
const auto data_type_size = Outputs::Display::size_for_data_type(modals.input_data_type);
|
||||
if(data_type_size != data_type_size_) {
|
||||
// TODO: flush output.
|
||||
|
||||
data_type_size_ = data_type_size;
|
||||
write_area_texture_.resize(2048*2048*data_type_size_);
|
||||
write_area_x_ = 0;
|
||||
write_area_pointers_.write_pointer = 0;
|
||||
}
|
||||
}
|
||||
|
||||
Outputs::Display::ScanTarget::Scan *ScanTarget::get_scan() {
|
||||
if(allocation_has_failed_) return nullptr;
|
||||
|
||||
const auto result = &scan_buffer_[scan_buffer_pointers_.write_pointer];
|
||||
|
||||
// Advance the pointer.
|
||||
const auto next_write_pointer = (scan_buffer_pointers_.write_pointer + 1) % scan_buffer_.size();
|
||||
|
||||
// Check whether that's too many.
|
||||
if(next_write_pointer == scan_buffer_pointers_.read_pointer) {
|
||||
allocation_has_failed_ = true;
|
||||
return nullptr;
|
||||
}
|
||||
scan_buffer_pointers_.write_pointer = next_write_pointer;
|
||||
|
||||
// Fill in extra OpenGL-specific details.
|
||||
result->data_y = write_area_pointers_.write_pointer;
|
||||
result->composite_y = 0;
|
||||
|
||||
return static_cast<Outputs::Display::ScanTarget::Scan *>(result);
|
||||
}
|
||||
|
||||
uint8_t *ScanTarget::allocate_write_area(size_t required_length, size_t required_alignment) {
|
||||
if(allocation_has_failed_) return nullptr;
|
||||
|
||||
// Will this fit on the current line? If so, job done.
|
||||
uint16_t aligned_start = write_area_x_ + 1;
|
||||
aligned_start += uint16_t((required_alignment - aligned_start%required_alignment)%required_alignment);
|
||||
const uint16_t end =
|
||||
aligned_start
|
||||
+ uint16_t(2 + required_length);
|
||||
if(end <= WriteAreaWidth) {
|
||||
last_supplied_x_ = aligned_start;
|
||||
return &write_area_texture_[write_area_pointers_.write_pointer*WriteAreaHeight + aligned_start];
|
||||
}
|
||||
|
||||
// Otherwise, look for the next line. But if that's where the read pointer is, don't proceed.
|
||||
const uint16_t next_y = (write_area_pointers_.write_pointer + 1) % WriteAreaHeight;
|
||||
if(next_y == write_area_pointers_.read_pointer) {
|
||||
allocation_has_failed_ = true;
|
||||
return nullptr;
|
||||
}
|
||||
|
||||
// Advance then.
|
||||
last_supplied_x_ = uint16_t(required_alignment);
|
||||
write_area_pointers_.write_pointer = next_y;
|
||||
return &write_area_texture_[write_area_pointers_.write_pointer*WriteAreaHeight + last_supplied_x_];
|
||||
}
|
||||
|
||||
void ScanTarget::reduce_previous_allocation_to(size_t actual_length) {
|
||||
if(allocation_has_failed_) return;
|
||||
|
||||
write_area_x_ = 2 + uint16_t(actual_length) + last_supplied_x_;
|
||||
}
|
||||
|
||||
void ScanTarget::submit() {
|
||||
// TODO.
|
||||
}
|
||||
71
Outputs/OpenGL/ScanTarget.hpp
Normal file
71
Outputs/OpenGL/ScanTarget.hpp
Normal file
@ -0,0 +1,71 @@
|
||||
//
|
||||
// ScanTarget.hpp
|
||||
// Clock Signal
|
||||
//
|
||||
// Created by Thomas Harte on 05/11/2018.
|
||||
// Copyright © 2018 Thomas Harte. All rights reserved.
|
||||
//
|
||||
|
||||
#ifndef ScanTarget_hpp
|
||||
#define ScanTarget_hpp
|
||||
|
||||
#include "../ScanTarget.hpp"
|
||||
|
||||
#include <array>
|
||||
#include <atomic>
|
||||
#include <cstdint>
|
||||
#include <vector>
|
||||
|
||||
namespace Outputs {
|
||||
namespace Display {
|
||||
namespace OpenGL {
|
||||
|
||||
class ScanTarget: public Outputs::Display::ScanTarget {
|
||||
public:
|
||||
void set_modals(Modals) override;
|
||||
Scan *get_scan() override;
|
||||
uint8_t *allocate_write_area(size_t required_length, size_t required_alignment) override;
|
||||
void reduce_previous_allocation_to(size_t actual_length) override;
|
||||
void submit() override;
|
||||
|
||||
private:
|
||||
// Extends the definition of a Scan to include two extra fields,
|
||||
// relevant to the way that this scan target processes video.
|
||||
struct Scan: public Outputs::Display::ScanTarget::Scan {
|
||||
/// Stores the y coordinate that this scan's data is at, within the write area texture.
|
||||
uint16_t data_y;
|
||||
/// Stores the y coordinate of this continuous composite segment within the conversion buffer.
|
||||
uint16_t composite_y;
|
||||
};
|
||||
|
||||
template <typename T> struct PointerSet {
|
||||
/// A pointer to the final thing currently cleared for submission.
|
||||
T submit_pointer;
|
||||
/// A pointer to the next thing that should be provided to the caller for data.
|
||||
T write_pointer;
|
||||
/// A pointer to the first thing not yet submitted for display.
|
||||
std::atomic<T> read_pointer;
|
||||
};
|
||||
|
||||
// Maintains a buffer of the most recent 3072 scans.
|
||||
std::array<Scan, 3072> scan_buffer_;
|
||||
PointerSet<size_t> scan_buffer_pointers_;
|
||||
|
||||
// Uses a texture to vend write areas.
|
||||
std::vector<uint8_t> write_area_texture_;
|
||||
size_t data_type_size_ = 0;
|
||||
uint16_t write_area_x_ = 0, last_supplied_x_ = 0;
|
||||
PointerSet<uint16_t> write_area_pointers_;
|
||||
|
||||
// Track allocation failures.
|
||||
bool allocation_has_failed_ = false;
|
||||
|
||||
// Receives scan target modals.
|
||||
Modals modals_;
|
||||
};
|
||||
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
#endif /* ScanTarget_hpp */
|
||||
@ -12,7 +12,7 @@
|
||||
#include <cstring>
|
||||
#include <sstream>
|
||||
|
||||
#include "../../../../SignalProcessing/FIRFilter.hpp"
|
||||
#include "../../../SignalProcessing/FIRFilter.hpp"
|
||||
|
||||
using namespace OpenGL;
|
||||
|
||||
@ -10,6 +10,7 @@
|
||||
#define Outputs_Display_ScanTarget_h
|
||||
|
||||
#include <cstddef>
|
||||
#include <cstdint>
|
||||
|
||||
namespace Outputs {
|
||||
namespace Display {
|
||||
@ -47,29 +48,10 @@ enum class ColourSpace {
|
||||
YUV
|
||||
};
|
||||
|
||||
/*!
|
||||
Provides an abstract target for 'scans' i.e. continuous sweeps of output data,
|
||||
which are identified by 2d start and end coordinates, and the PCM-sampled data
|
||||
that is output during the sweep.
|
||||
|
||||
Additional information is provided to allow decoding (and/or encoding) of a
|
||||
composite colour feed.
|
||||
|
||||
Otherwise helpful: the ScanTarget vends all allocated memory. That should allow
|
||||
for use of shared memory where available.
|
||||
*/
|
||||
struct ScanTarget {
|
||||
|
||||
/*
|
||||
This top section of the interface deals with modal settings. A ScanTarget can
|
||||
assume that the modals change very infrequently.
|
||||
*/
|
||||
|
||||
struct Modals {
|
||||
/*!
|
||||
Enumerates the potential formats of input data.
|
||||
*/
|
||||
enum class DataType {
|
||||
enum class InputDataType {
|
||||
|
||||
// The luminance types can be used to feed only two video pipelines:
|
||||
// black and white video, or composite colour.
|
||||
@ -93,7 +75,46 @@ struct ScanTarget {
|
||||
Red2Green2Blue2, // 1 byte/pixel; bits 0 and 1 are blue, bits 2 and 3 are green, bits 4 and 5 are blue.
|
||||
Red4Green4Blue4, // 2 bytes/pixel; first nibble is red, second is green, third is blue.
|
||||
Red8Green8Blue8, // 4 bytes/pixel; first is red, second is green, third is blue, fourth is vacant.
|
||||
} source_data_type;
|
||||
};
|
||||
|
||||
inline size_t size_for_data_type(InputDataType data_type) {
|
||||
switch(data_type) {
|
||||
case InputDataType::Luminance1:
|
||||
case InputDataType::Luminance8:
|
||||
case InputDataType::Red1Green1Blue1:
|
||||
case InputDataType::Red2Green2Blue2:
|
||||
return 1;
|
||||
|
||||
case InputDataType::Phase8Luminance8:
|
||||
case InputDataType::Red4Green4Blue4:
|
||||
return 2;
|
||||
|
||||
case InputDataType::Red8Green8Blue8:
|
||||
return 4;
|
||||
}
|
||||
}
|
||||
|
||||
/*!
|
||||
Provides an abstract target for 'scans' i.e. continuous sweeps of output data,
|
||||
which are identified by 2d start and end coordinates, and the PCM-sampled data
|
||||
that is output during the sweep.
|
||||
|
||||
Additional information is provided to allow decoding (and/or encoding) of a
|
||||
composite colour feed.
|
||||
|
||||
Otherwise helpful: the ScanTarget vends all allocated memory. That should allow
|
||||
for use of shared memory where available.
|
||||
*/
|
||||
struct ScanTarget {
|
||||
|
||||
/*
|
||||
This top section of the interface deals with modal settings. A ScanTarget can
|
||||
assume that the modals change very infrequently.
|
||||
*/
|
||||
|
||||
struct Modals {
|
||||
/// Describes the format of input data.
|
||||
InputDataType input_data_type;
|
||||
|
||||
/// If being fed composite data, this defines the colour space in use.
|
||||
ColourSpace composite_colour_space;
|
||||
@ -187,19 +208,22 @@ struct ScanTarget {
|
||||
|
||||
/// Announces that the owner is finished with the region created by the most recent @c allocate_write_area
|
||||
/// and indicates that its actual final size was @c actual_length.
|
||||
virtual void reduce_previous_allocation_to(size_t actual_length) {};
|
||||
///
|
||||
/// It is required that every call to allocate_write_area be paired with a call to reduce_previous_allocation_to.
|
||||
virtual void reduce_previous_allocation_to(size_t actual_length) {}
|
||||
|
||||
/// Announces that all endpoint pairs and write areas obtained since the last @c submit have now been
|
||||
/// populated with appropriate data.
|
||||
/// Marks the end of an atomic set of data. Drawing is best effort, so the scan target should either:
|
||||
///
|
||||
/// (i) output everything received since the previous submit; or
|
||||
/// (ii) output nothing.
|
||||
///
|
||||
/// If there were any allocation failures — i.e. any null responses to allocate_write_area or
|
||||
/// get_scan — then (ii) is a required response. But a scan target may also need to opt for (ii)
|
||||
/// for any other reason.
|
||||
///
|
||||
/// The ScanTarget isn't bound to take any drawing action immediately; it may sit on submitted data for
|
||||
/// as long as it feels is appropriate subject to an @c flush.
|
||||
virtual void submit(bool only_if_no_allocation_failures = true) = 0;
|
||||
|
||||
/// Announces that any submitted data not yet output should be output now, but needn't block while
|
||||
/// doing so. This generally communicates that processing is now otherwise 'up to date', so no
|
||||
/// further delay should be allowed.
|
||||
// virtual void flush() = 0;
|
||||
virtual void submit() = 0;
|
||||
|
||||
|
||||
/*
|
||||
|
||||
Loading…
Reference in New Issue
Block a user