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 43 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 333 of file blit_command_gles.cc.

334  {
335  if (source->GetTextureDescriptor().format != PixelFormat::kR8G8B8A8UNormInt) {
336  VALIDATION_LOG << "Only textures with pixel format RGBA are supported yet.";
337  return false;
338  }
339 
340  const auto& gl = reactor.GetProcTable();
341  TextureCoordinateSystem coord_system = source->GetCoordinateSystem();
342 
343  GLuint read_fbo = GL_NONE;
344  fml::ScopedCleanupClosure delete_fbos(
345  [&gl, &read_fbo]() { DeleteFBO(gl, read_fbo, GL_READ_FRAMEBUFFER); });
346 
347  {
348  auto read = ConfigureFBO(gl, source, GL_READ_FRAMEBUFFER);
349  if (!read.has_value()) {
350  return false;
351  }
352  read_fbo = read.value();
353  }
354 
356  .UpdateBufferData([&gl, this, coord_system,
357  rows = source->GetSize().height](uint8_t* data,
358 
359  size_t length) {
360  gl.ReadPixels(source_region.GetX(), source_region.GetY(),
361  source_region.GetWidth(), source_region.GetHeight(),
362  GL_RGBA, GL_UNSIGNED_BYTE, data + destination_offset);
363  switch (coord_system) {
364  case TextureCoordinateSystem::kUploadFromHost:
365  break;
366  case TextureCoordinateSystem::kRenderToTexture:
367  // The texture is upside down, and must be inverted when copying
368  // byte data out.
369  FlipImage(data + destination_offset, source_region.GetWidth(),
370  source_region.GetHeight(), 4);
371  }
372  });
373 
374  return true;
375 };
static DeviceBufferGLES & Cast(DeviceBuffer &base)
Definition: backend_cast.h:13
void UpdateBufferData(const std::function< void(uint8_t *, size_t length)> &update_buffer_data)
static std::optional< GLuint > ConfigureFBO(const ProcTableGLES &gl, const std::shared_ptr< Texture > &texture, GLenum fbo_type)
static void DeleteFBO(const ProcTableGLES &gl, GLuint fbo, GLenum type)
TextureCoordinateSystem
Definition: formats.h:327
std::shared_ptr< DeviceBuffer > destination
Definition: blit_command.h:33
std::shared_ptr< Texture > source
Definition: blit_command.h:32
std::shared_ptr< const fml::Mapping > data
Definition: texture_gles.cc:68
#define VALIDATION_LOG
Definition: validation.h:91

References impeller::BackendCast< DeviceBufferGLES, DeviceBuffer >::Cast(), impeller::ConfigureFBO(), data, impeller::DeleteFBO(), impeller::BlitCopyTextureToBufferCommand::destination, impeller::ReactorGLES::GetProcTable(), impeller::kR8G8B8A8UNormInt, impeller::BlitCopyTextureToBufferCommand::source, impeller::DeviceBufferGLES::UpdateBufferData(), and VALIDATION_LOG.

◆ GetLabel()

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

Implements impeller::BlitEncodeGLES.

Definition at line 329 of file blit_command_gles.cc.

329  {
330  return label;
331 }

References impeller::BlitCommand::label.


The documentation for this struct was generated from the following files: