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// surface.cpp
#include "surface.h"
#include <stdlib.h>
#include <stdio.h>
#include "../../source/core/slang-list.h"
namespace gfx {
using namespace Slang;
class MallocSurfaceAllocator: public SurfaceAllocator
{
public:
virtual Slang::Result allocate(int width, int height, Format format, int alignment, Surface& surface) override;
virtual void deallocate(Surface& surface) override;
};
static MallocSurfaceAllocator s_mallocSurfaceAllocator;
/// Get the malloc allocator
/* static */SurfaceAllocator* SurfaceAllocator::getMallocAllocator()
{
return &s_mallocSurfaceAllocator;
}
Slang::Result MallocSurfaceAllocator::allocate(int width, int height, Format format, int alignment, Surface& surface)
{
assert(surface.m_data == nullptr);
// Calculate row size
const int rowSizeInBytes = Surface::calcRowSize(format, width);
const int numRows = Surface::calcNumRows(format, height);
alignment = (alignment <= 0) ? int(sizeof(void*)) : alignment;
// It must be a power of 2
assert( ((alignment - 1) & alignment) == 0);
// Align rowSize
const int alignedRowSizeInBytes = (rowSizeInBytes + alignment - 1) & -alignment;
size_t totalSize = numRows * alignedRowSizeInBytes;
uint8_t* data = (uint8_t*)::malloc(totalSize);
if (!data)
{
return SLANG_E_OUT_OF_MEMORY;
}
surface.m_data = data;
surface.m_width = width;
surface.m_height = height;
surface.m_format = format;
surface.m_numRows = numRows;
surface.m_rowStrideInBytes = alignedRowSizeInBytes;
surface.m_allocator = this;
return SLANG_OK;
}
void MallocSurfaceAllocator::deallocate(Surface& surface)
{
assert(surface.m_data);
// Make sure it's not an inverted, cos otherwise m_data is not the start address
assert(surface.m_rowStrideInBytes > 0);
::free(surface.m_data);
}
// !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!! Surface !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
/* static */int Surface::calcRowSize(Format format, int width)
{
size_t pixelSize = RendererUtil::getFormatSize(format);
if (pixelSize == 0)
{
return 0;
}
return int(pixelSize * width);
}
/* static */int Surface::calcNumRows(Format format, int height)
{
// Don't have any compressed types, so number of rows is same as the height
return height;
}
void Surface::init()
{
m_width = 0;
m_height = 0;
m_format = Format::Unknown;
m_data = nullptr;
m_numRows = 0;
m_rowStrideInBytes = 0;
// NOTE! does not clear the allocator.
// If called with an allocation memory will leak!
}
Surface::~Surface()
{
if (m_data && m_allocator)
{
m_allocator->deallocate(*this);
}
}
void Surface::deallocate()
{
if (m_data && m_allocator)
{
m_allocator->deallocate(*this);
init();
}
}
Result Surface::allocate(int width, int height, Format format, int alignment, SurfaceAllocator* allocator)
{
deallocate();
allocator = allocator ? allocator : m_allocator;
if (!allocator)
{
// An allocator needs to be set on the surface, or one passed in.
return SLANG_FAIL;
}
return allocator->allocate(width, height, format, alignment, *this);
}
void Surface::setUnowned(int width, int height, Format format, int strideInBytes, void* data)
{
deallocate();
// This is unowned
m_allocator = nullptr;
m_width = width;
m_height = height;
m_format = format;
m_rowStrideInBytes = strideInBytes;
m_data = (uint8_t*)data;
m_numRows = Surface::calcNumRows(format, height);
const int rowSizeInBytes = Surface::calcRowSize(format, width);
assert((strideInBytes > 0 && rowSizeInBytes <= strideInBytes) || (strideInBytes < 0 && rowSizeInBytes <= -strideInBytes));
}
void Surface::zeroContents()
{
const int rowSizeInBytes = Surface::calcRowSize(m_format, m_width);
const int stride = m_rowStrideInBytes;
uint8_t* dst = m_data;
for (int i = 0; i < m_numRows; i++, dst += stride)
{
::memset(dst, 0, rowSizeInBytes);
}
}
void Surface::flipInplaceVertically()
{
// Can only flip when m_height matches number of rows
assert(m_numRows == m_height);
const int rowSizeInBytes = Surface::calcRowSize(m_format, m_width);
if (rowSizeInBytes <= 0 || m_numRows <= 1)
{
return;
}
uint8_t* top = m_data;
uint8_t* bottom = m_data + (m_numRows - 1) * m_rowStrideInBytes;
List<uint8_t> bufferList;
bufferList.setCount(rowSizeInBytes);
uint8_t* buffer = bufferList.getBuffer();
const int stride = m_rowStrideInBytes;
const int num = m_height >> 1;
for (int i = 0; i < num; ++i, top += stride, bottom -= stride)
{
::memcpy(buffer, top, rowSizeInBytes);
::memcpy(top, bottom, rowSizeInBytes);
::memcpy(bottom, buffer, rowSizeInBytes);
}
}
SlangResult Surface::set(int width, int height, Format format, int srcRowStride, const void* data, SurfaceAllocator* allocator)
{
if (hasContents() && m_width == width && m_height == height && m_format == format)
{
// I can just overwrite the contents that is there
}
else
{
SLANG_RETURN_ON_FAIL(allocate(width, height, format, 0, allocator));
}
// Okay just need to set the contents
{
const size_t rowSize = calcRowSize(format, width);
const uint8_t* srcRow = (const uint8_t*)data;
uint8_t* dstRow = (uint8_t*)m_data;
for (int i = 0; i < m_numRows; i++)
{
::memcpy(dstRow, srcRow, rowSize);
srcRow += srcRowStride;
dstRow += m_rowStrideInBytes;
}
}
return SLANG_OK;
}
} // renderer_test
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