Flutter Impeller
impeller::BlitCopyTextureToBufferCommandGLES Struct Reference

#include <blit_command_gles.h>

Inheritance diagram for impeller::BlitCopyTextureToBufferCommandGLES:
impeller::BlitEncodeGLES impeller::BlitCopyTextureToBufferCommand impeller::BackendCast< BlitEncodeGLES, BlitCommand > impeller::BlitCommand

Public Member Functions

 ~BlitCopyTextureToBufferCommandGLES () override
 
std::string GetLabel () const override
 
bool Encode (const ReactorGLES &reactor) const override
 
- Public Member Functions inherited from impeller::BlitEncodeGLES
virtual ~BlitEncodeGLES ()
 

Additional Inherited Members

- Static Public Member Functions inherited from impeller::BackendCast< BlitEncodeGLES, BlitCommand >
static BlitEncodeGLESCast (BlitCommand &base)
 
static const BlitEncodeGLESCast (const BlitCommand &base)
 
static BlitEncodeGLESCast (BlitCommand *base)
 
static const BlitEncodeGLESCast (const BlitCommand *base)
 
- Public Attributes inherited from impeller::BlitCopyTextureToBufferCommand
std::shared_ptr< Texturesource
 
std::shared_ptr< DeviceBufferdestination
 
IRect source_region
 
size_t destination_offset
 
- Public Attributes inherited from impeller::BlitCommand
std::string label
 

Detailed Description

Definition at line 33 of file blit_command_gles.h.

Constructor & Destructor Documentation

◆ ~BlitCopyTextureToBufferCommandGLES()

impeller::BlitCopyTextureToBufferCommandGLES::~BlitCopyTextureToBufferCommandGLES ( )
overridedefault

Member Function Documentation

◆ Encode()

bool impeller::BlitCopyTextureToBufferCommandGLES::Encode ( const ReactorGLES reactor) const
overridevirtual

Implements impeller::BlitEncodeGLES.

Definition at line 127 of file blit_command_gles.cc.

128  {
129  if (source->GetTextureDescriptor().format != PixelFormat::kR8G8B8A8UNormInt) {
130  VALIDATION_LOG << "Only textures with pixel format RGBA are supported yet.";
131  return false;
132  }
133 
134  const auto& gl = reactor.GetProcTable();
135 
136  GLuint read_fbo = GL_NONE;
137  fml::ScopedCleanupClosure delete_fbos(
138  [&gl, &read_fbo]() { DeleteFBO(gl, read_fbo, GL_READ_FRAMEBUFFER); });
139 
140  {
141  auto read = ConfigureFBO(gl, source, GL_READ_FRAMEBUFFER);
142  if (!read.has_value()) {
143  return false;
144  }
145  read_fbo = read.value();
146  }
147 
149  .UpdateBufferData([&gl, this](uint8_t* data, size_t length) {
150  gl.ReadPixels(source_region.GetX(), source_region.GetY(),
152  GL_RGBA, GL_UNSIGNED_BYTE, data + destination_offset);
153  });
154 
155  return true;
156 };

References impeller::BackendCast< DeviceBufferGLES, DeviceBuffer >::Cast(), impeller::ConfigureFBO(), impeller::DeleteFBO(), impeller::BlitCopyTextureToBufferCommand::destination, impeller::BlitCopyTextureToBufferCommand::destination_offset, impeller::TRect< T >::GetHeight(), impeller::ReactorGLES::GetProcTable(), impeller::TRect< T >::GetWidth(), impeller::TRect< T >::GetX(), impeller::TRect< T >::GetY(), impeller::kR8G8B8A8UNormInt, impeller::BlitCopyTextureToBufferCommand::source, impeller::BlitCopyTextureToBufferCommand::source_region, impeller::DeviceBufferGLES::UpdateBufferData(), and VALIDATION_LOG.

◆ GetLabel()

std::string impeller::BlitCopyTextureToBufferCommandGLES::GetLabel ( ) const
overridevirtual

Implements impeller::BlitEncodeGLES.

Definition at line 123 of file blit_command_gles.cc.

123  {
124  return label;
125 }

References impeller::BlitCommand::label.


The documentation for this struct was generated from the following files:
impeller::DeleteFBO
static void DeleteFBO(const ProcTableGLES &gl, GLuint fbo, GLenum type)
Definition: blit_command_gles.cc:16
impeller::ConfigureFBO
static std::optional< GLuint > ConfigureFBO(const ProcTableGLES &gl, const std::shared_ptr< Texture > &texture, GLenum fbo_type)
Definition: blit_command_gles.cc:23
impeller::PixelFormat::kR8G8B8A8UNormInt
@ kR8G8B8A8UNormInt
impeller::TRect::GetX
constexpr Type GetX() const
Returns the X coordinate of the upper left corner, equivalent to |GetOrigin().x|.
Definition: rect.h:300
impeller::TRect::GetHeight
constexpr Type GetHeight() const
Returns the height of the rectangle, equivalent to |GetSize().height|.
Definition: rect.h:314
impeller::BlitCommand::label
std::string label
Definition: blit_command.h:15
impeller::TRect::GetWidth
constexpr Type GetWidth() const
Returns the width of the rectangle, equivalent to |GetSize().width|.
Definition: rect.h:308
impeller::BlitCopyTextureToBufferCommand::destination_offset
size_t destination_offset
Definition: blit_command.h:29
impeller::BlitCopyTextureToBufferCommand::destination
std::shared_ptr< DeviceBuffer > destination
Definition: blit_command.h:27
impeller::DeviceBufferGLES::UpdateBufferData
void UpdateBufferData(const std::function< void(uint8_t *, size_t length)> &update_buffer_data)
Definition: device_buffer_gles.cc:117
VALIDATION_LOG
#define VALIDATION_LOG
Definition: validation.h:73
impeller::BackendCast< DeviceBufferGLES, DeviceBuffer >::Cast
static DeviceBufferGLES & Cast(DeviceBuffer &base)
Definition: backend_cast.h:13
impeller::BlitCopyTextureToBufferCommand::source
std::shared_ptr< Texture > source
Definition: blit_command.h:26
impeller::TRect::GetY
constexpr Type GetY() const
Returns the Y coordinate of the upper left corner, equivalent to |GetOrigin().y|.
Definition: rect.h:304
impeller::BlitCopyTextureToBufferCommand::source_region
IRect source_region
Definition: blit_command.h:28