| Flutter Impeller |

Public Member Functions | List of all members
impeller::BlitCopyTextureToBufferCommandGLES Struct Reference

`#include <blit_command_gles.h>`

Inheritance diagram for impeller::BlitCopyTextureToBufferCommandGLES:

## 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 BlitEncodeGLES & | Cast (BlitCommand &base)
static const BlitEncodeGLES & | Cast (const BlitCommand &base)
static BlitEncodeGLES * | Cast (BlitCommand *base)
static const BlitEncodeGLES * | Cast (const BlitCommand *base)
Public Attributes inherited from impeller::BlitCopyTextureToBufferCommand
std::shared_ptr< Texture > | source
std::shared_ptr< DeviceBuffer > | destination
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 | ( |  | ) |
| override default

## Member Function Documentation

## ◆ Encode()

bool impeller::BlitCopyTextureToBufferCommandGLES::Encode | ( | const ReactorGLES & | reactor | ) | const
| override virtual

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
355 DeviceBufferGLES::Cast(*destination)
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 };
impeller::BackendCast< DeviceBufferGLES, DeviceBuffer >::Cast
static DeviceBufferGLES & Cast(DeviceBuffer &base)
Definition: backend_cast.h:13
impeller::DeviceBufferGLES::UpdateBufferData
void UpdateBufferData(const std::function< void(uint8_t *, size_t length)> &update_buffer_data)
Definition: device_buffer_gles.cc:151
impeller::ConfigureFBO
static std::optional< GLuint > ConfigureFBO(const ProcTableGLES &gl, const std::shared_ptr< Texture > &texture, GLenum fbo_type)
Definition: blit_command_gles.cc:50
impeller::PixelFormat::kR8G8B8A8UNormInt
@ kR8G8B8A8UNormInt
impeller::DeleteFBO
static void DeleteFBO(const ProcTableGLES &gl, GLuint fbo, GLenum type)
Definition: blit_command_gles.cc:43
impeller::TextureCoordinateSystem
TextureCoordinateSystem
Definition: formats.h:327
impeller::BlitCopyTextureToBufferCommand::destination
std::shared_ptr< DeviceBuffer > destination
Definition: blit_command.h:33
impeller::BlitCopyTextureToBufferCommand::source
std::shared_ptr< Texture > source
Definition: blit_command.h:32
data
std::shared_ptr< const fml::Mapping > data
Definition: texture_gles.cc:64
VALIDATION_LOG
#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
| override virtual

Implements impeller::BlitEncodeGLES.

Definition at line 329 of file blit_command_gles.cc.

329 {
330 return label;
331 }
impeller::BlitCommand::label
std::string label
Definition: blit_command.h:16

References impeller::BlitCommand::label.

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

- impeller/renderer/backend/gles/blit_command_gles.h
- impeller/renderer/backend/gles/blit_command_gles.cc