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Documented this interface, albeit that the English could do with a second pass, and very sightly simplified inline with current usage.

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This commit is contained in:
Thomas Harte 2016-11-16 13:15:50 +08:00
parent 4d0d5eb919
commit c1a509910d
3 changed files with 13 additions and 12 deletions
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3
Outputs/CRT/Internals/CRTOpenGL.hpp
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@ -183,8 +183,7 @@ class OpenGLOutputBuilder {
inline uint8_t *allocate_write_area(size_t required_length) inline uint8_t *allocate_write_area(size_t required_length)
{ {
_texture_builder->allocate_write_area(required_length); return _texture_builder->allocate_write_area(required_length);
return _texture_builder->get_write_target();
} }
inline void reduce_previous_allocation_to(size_t actual_length) inline void reduce_previous_allocation_to(size_t actual_length)

12
Outputs/CRT/Internals/InputTextureBuilder.cpp
View File

@ -20,7 +20,7 @@ InputTextureBuilder::InputTextureBuilder(size_t bytes_per_pixel) :
_image.resize(bytes_per_pixel * InputBufferBuilderWidth * InputBufferBuilderHeight); _image.resize(bytes_per_pixel * InputBufferBuilderWidth * InputBufferBuilderHeight);
} }
void InputTextureBuilder::allocate_write_area(size_t required_length) uint8_t *InputTextureBuilder::allocate_write_area(size_t required_length)
{ {
if(_next_write_y_position != InputBufferBuilderHeight) if(_next_write_y_position != InputBufferBuilderHeight)
{ {
@ -32,7 +32,7 @@ void InputTextureBuilder::allocate_write_area(size_t required_length)
_next_write_y_position++; _next_write_y_position++;
if(_next_write_y_position == InputBufferBuilderHeight) if(_next_write_y_position == InputBufferBuilderHeight)
return; return nullptr;
} }
_write_x_position = _next_write_x_position + 1; _write_x_position = _next_write_x_position + 1;
@ -40,6 +40,9 @@ void InputTextureBuilder::allocate_write_area(size_t required_length)
_write_target_pointer = (_write_y_position * InputBufferBuilderWidth) + _write_x_position; _write_target_pointer = (_write_y_position * InputBufferBuilderWidth) + _write_x_position;
_next_write_x_position += required_length + 2; _next_write_x_position += required_length + 2;
} }
else return nullptr;
return &_image[_write_target_pointer * _bytes_per_pixel];
} }
bool InputTextureBuilder::is_full() bool InputTextureBuilder::is_full()
@ -90,11 +93,6 @@ uint16_t InputTextureBuilder::get_and_finalise_current_line()
return result; return result;
} }
uint8_t *InputTextureBuilder::get_write_target()
{
return (_next_write_y_position == InputBufferBuilderHeight) ? nullptr : &_image[_write_target_pointer * _bytes_per_pixel];
}
uint16_t InputTextureBuilder::get_last_write_x_position() uint16_t InputTextureBuilder::get_last_write_x_position()
{ {
return _write_x_position; return _write_x_position;

10
Outputs/CRT/Internals/InputTextureBuilder.hpp
View File

@ -31,7 +31,8 @@ class InputTextureBuilder {
/// Finds the first available space of at least @c required_length pixels in size. Calls must be paired off /// Finds the first available space of at least @c required_length pixels in size. Calls must be paired off
/// with calls to @c reduce_previous_allocation_to. /// with calls to @c reduce_previous_allocation_to.
void allocate_write_area(size_t required_length); /// @returns a pointer to the allocated space if any was available; @c nullptr otherwise.
uint8_t *allocate_write_area(size_t required_length);
/// Announces that the owner is finished with the region created by the most recent @c allocate_write_area /// 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. /// and indicates that its actual final size was @c actual_length.
@ -44,14 +45,17 @@ class InputTextureBuilder {
/// @returns a pointer to the image data for this texture. /// @returns a pointer to the image data for this texture.
uint8_t *get_image_pointer(); uint8_t *get_image_pointer();
uint8_t *get_write_target(); /// @returns the start column for the most recent allocated write area.
uint16_t get_last_write_x_position(); uint16_t get_last_write_x_position();
/// @returns the row of the most recent allocated write area.
uint16_t get_last_write_y_position(); uint16_t get_last_write_y_position();
/// @returns the number of bytes per pixel as supplied to the constructor.
size_t get_bytes_per_pixel(); size_t get_bytes_per_pixel();
/// @returns @c true if all future calls to @c allocate_write_area will fail on account of the input texture
/// being full; @c false if calls may succeed.
bool is_full(); bool is_full();
private: private: