| 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 340 of file blit_command_gles.cc.

341 {
342 if (source->GetTextureDescriptor().format != PixelFormat::kR8G8B8A8UNormInt) {
343 VALIDATION_LOG << "Only textures with pixel format RGBA are supported yet.";
344 return false;
345 }
346
347 const auto& gl = reactor.GetProcTable();
348 TextureCoordinateSystem coord_system = source->GetCoordinateSystem();
349
350 GLuint read_fbo = GL_NONE;
351 fml::ScopedCleanupClosure delete_fbos(
352 [&gl, &read_fbo]() { DeleteFBO(gl, read_fbo, GL_FRAMEBUFFER); });
353
354 {
355 auto read = ConfigureFBO(gl, source, GL_FRAMEBUFFER);
356 if (!read.has_value()) {
357 return false;
358 }
359 read_fbo = read.value();
360 }
361
362 DeviceBufferGLES::Cast(*destination)
363 .UpdateBufferData([&gl, this, coord_system,
364 rows = source->GetSize().height](uint8_t* data,
365
366 size_t length) {
367 gl.ReadPixels(source_region.GetX(), source_region.GetY(),
368 source_region.GetWidth(), source_region.GetHeight(),
369 GL_RGBA, GL_UNSIGNED_BYTE, data + destination_offset);
370 switch (coord_system) {
371 case TextureCoordinateSystem::kUploadFromHost:
372 break;
373 case TextureCoordinateSystem::kRenderToTexture:
374 // The texture is upside down, and must be inverted when copying
375 // byte data out.
376 FlipImage(data + destination_offset, source_region.GetWidth(),
377 source_region.GetHeight(), 4);
378 }
379 });
380
381 return true;
382 };
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:330
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:69
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.

Referenced by impeller::testing::TEST().

## ◆ GetLabel()

std::string impeller::BlitCopyTextureToBufferCommandGLES::GetLabel | ( |  | ) | const
| override virtual

Implements impeller::BlitEncodeGLES.

Definition at line 336 of file blit_command_gles.cc.

336 {
337 return label;
338 }
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