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#include "drape/font_texture.hpp"
#include "drape/pointers.hpp"
#include "drape/utils/stb_image.h"
#include "platform/platform.hpp"
#include "coding/reader.hpp"
#include "base/logging.hpp"
#include "base/string_utils.hpp"
#include "base/stl_add.hpp"
#include "std/string.hpp"
#include "std/vector.hpp"
#include "std/map.hpp"
#include "std/bind.hpp"
#include <boost/gil/algorithm.hpp>
#include <boost/gil/typedefs.hpp>
using boost::gil::gray8c_pixel_t;
using boost::gil::gray8_pixel_t;
using boost::gil::gray8c_view_t;
using boost::gil::gray8_view_t;
using boost::gil::interleaved_view;
using boost::gil::subimage_view;
using boost::gil::copy_pixels;
typedef gray8_view_t view_t;
typedef gray8c_view_t const_view_t;
typedef gray8_pixel_t pixel_t;
typedef gray8c_pixel_t const_pixel_t;
namespace dp
{
GlyphPacker::GlyphPacker(const m2::PointU & size)
: m_size(size)
{
}
bool GlyphPacker::PackGlyph(uint32_t width, uint32_t height, m2::RectU & rect)
{
ASSERT_LESS(width, m_size.x, ());
ASSERT_LESS(height, m_size.y, ());
if (m_cursor.x + width > m_size.x)
{
m_cursor.x = 0;
m_cursor.y += m_yStep;
m_yStep = 0;
}
if (m_cursor.y + height > m_size.y)
{
m_isFull = true;
return false;
}
rect = m2::RectU(m_cursor.x, m_cursor.y,
m_cursor.x + width, m_cursor.y + height);
m_cursor.x += width;
m_yStep = max(height, m_yStep);
return true;
}
m2::RectF GlyphPacker::MapTextureCoords(const m2::RectU & pixelRect) const
{
float fWidth = static_cast<float>(m_size.x);
float fHeight = static_cast<float>(m_size.y);
return m2::RectF(pixelRect.minX() / fWidth,
pixelRect.minY() / fHeight,
pixelRect.maxX() / fWidth,
pixelRect.maxY() / fHeight);
}
bool GlyphPacker::IsFull() const { return m_isFull; }
GlyphIndex::GlyphIndex(m2::PointU size, RefPointer<GlyphManager> mng)
: m_packer(size)
, m_mng(mng)
{
}
RefPointer<Texture::ResourceInfo> GlyphIndex::MapResource(GlyphKey const & key)
{
strings::UniChar uniChar = key.GetUnicodePoint();
auto it = m_index.find(uniChar);
if (it != m_index.end())
return MakeStackRefPointer<Texture::ResourceInfo>(&it->second);
GlyphManager::Glyph glyph = m_mng->GetGlyph(uniChar);
m2::RectU r;
if (!m_packer.PackGlyph(glyph.m_image.m_width, glyph.m_image.m_height, r))
{
glyph.m_image.Destroy();
return RefPointer<GlyphInfo>();
}
m_pendingNodes.emplace_back(r, glyph);
auto res = m_index.emplace(uniChar, GlyphInfo(m_packer.MapTextureCoords(r), glyph.m_metrics));
ASSERT(res.second, ());
return MakeStackRefPointer<GlyphInfo>(&res.first->second);
}
void GlyphIndex::UploadResources(RefPointer<Texture> texture)
{
if (m_pendingNodes.empty())
return;
buffer_vector<size_t, 3> ranges;
buffer_vector<uint32_t, 2> maxHeights;
ranges.push_back(0);
uint32_t maxHeight = m_pendingNodes[0].first.SizeY();
for (size_t i = 1; i < m_pendingNodes.size(); ++i)
{
TPendingNode const & prevNode = m_pendingNodes[i - 1];
maxHeight = max(maxHeight, prevNode.first.SizeY());
TPendingNode const & currentNode = m_pendingNodes[i];
if (ranges.size() < 2 && prevNode.first.minY() < currentNode.first.minY())
{
ranges.push_back(i);
maxHeights.push_back(maxHeight);
maxHeight = currentNode.first.SizeY();
}
}
maxHeights.push_back(maxHeight);
ranges.push_back(m_pendingNodes.size());
ASSERT(maxHeights.size() < 3, ());
ASSERT(ranges.size() < 4, ());
for (size_t i = 1; i < ranges.size(); ++i)
{
size_t startIndex = ranges[i - 1];
size_t endIndex = ranges[i];
uint32_t height = maxHeights[i - 1];
uint32_t width = m_pendingNodes[endIndex - 1].first.maxX() - m_pendingNodes[startIndex].first.minX();
uint32_t byteCount = my::NextPowOf2(height * width);
m2::PointU zeroPoint = m_pendingNodes[startIndex].first.LeftBottom();
SharedBufferManager::shared_buffer_ptr_t buffer = SharedBufferManager::instance().reserveSharedBuffer(byteCount);
uint8_t * dstMemory = SharedBufferManager::GetRawPointer(buffer);
view_t dstView = interleaved_view(width, height, (pixel_t *)dstMemory, width);
for (size_t node = startIndex; node < endIndex; ++node)
{
GlyphManager::Glyph & glyph = m_pendingNodes[node].second;
m2::RectU rect = m_pendingNodes[node].first;
if (rect.SizeX() == 0 || rect.SizeY() == 0)
continue;
rect.Offset(-zeroPoint);
uint32_t w = rect.SizeX();
uint32_t h = rect.SizeY();
ASSERT_EQUAL(glyph.m_image.m_width, w, ());
ASSERT_EQUAL(glyph.m_image.m_height, h, ());
view_t dstSubView = subimage_view(dstView, rect.minX(), rect.minY(), w, h);
uint8_t * srcMemory = SharedBufferManager::GetRawPointer(glyph.m_image.m_data);
const_view_t srcView = interleaved_view(w, h, (const_pixel_t *)srcMemory, w);
copy_pixels(srcView, dstSubView);
glyph.m_image.Destroy();
}
texture->UploadData(zeroPoint.x, zeroPoint.y, width, height, dp::ALPHA, MakeStackRefPointer<void>(dstMemory));
SharedBufferManager::instance().freeSharedBuffer(byteCount, buffer);
}
m_pendingNodes.clear();
}
} // namespace dp
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