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#include "path_text_shape.hpp"
#include "text_layout.hpp"
#include "visual_params.hpp"
#include "intrusive_vector.hpp"
#include "../drape/shader_def.hpp"
#include "../drape/attribute_provider.hpp"
#include "../drape/glstate.hpp"
#include "../drape/batcher.hpp"
#include "../base/math.hpp"
#include "../base/logging.hpp"
#include "../base/stl_add.hpp"
#include "../base/string_utils.hpp"
#include "../base/timer.hpp"
#include "../base/matrix.hpp"
#include "../geometry/transformations.hpp"
#include "../std/algorithm.hpp"
#include "../std/vector.hpp"
using m2::Spline;
namespace
{
class PathTextHandle : public dp::OverlayHandle
{
public:
PathTextHandle(m2::SharedSpline const & spl,
df::SharedTextLayout const & layout,
float const mercatorOffset,
float const depth)
: OverlayHandle(FeatureID(), dp::Center, depth)
, m_spline(spl)
, m_layout(layout)
{
m_centerPointIter = m_spline.CreateIterator();
m_centerPointIter.Advance(mercatorOffset);
m_normals.resize(4 * m_layout->GetGlyphCount());
}
void Update(ScreenBase const & screen)
{
if (m_layout->CacheDynamicGeometry(m_centerPointIter, screen, m_normals))
{
SetIsValid(true);
return;
}
SetIsValid(false);
}
m2::RectD GetPixelRect(ScreenBase const & screen) const
{
ASSERT(IsValid(), ());
m2::PointD pixelPivot(screen.GtoP(m_centerPointIter.m_pos));
m2::RectD result;
for (gpu::TextDynamicVertex const & v : m_normals)
result.Add(pixelPivot + glsl::ToPoint(v.m_normal));
return result;
}
void GetPixelShape(ScreenBase const & screen, Rects & rects) const
{
ASSERT(IsValid(), ());
m2::PointD pixelPivot(screen.GtoP(m_centerPointIter.m_pos));
for (size_t quadIndex = 0; quadIndex < m_normals.size(); quadIndex += 4)
{
m2::RectF r;
r.Add(pixelPivot + glsl::ToPoint(m_normals[quadIndex].m_normal));
r.Add(pixelPivot + glsl::ToPoint(m_normals[quadIndex + 1].m_normal));
r.Add(pixelPivot + glsl::ToPoint(m_normals[quadIndex + 2].m_normal));
r.Add(pixelPivot + glsl::ToPoint(m_normals[quadIndex + 3].m_normal));
rects.push_back(r);
}
}
void GetAttributeMutation(dp::RefPointer<dp::AttributeBufferMutator> mutator, ScreenBase const & screen) const
{
ASSERT(IsValid(), ());
TOffsetNode const & node = GetOffsetNode(gpu::TextDynamicVertex::GetDynamicStreamID());
ASSERT(node.first.GetElementSize() == sizeof(gpu::TextDynamicVertex), ());
ASSERT(node.second.m_count == m_normals.size(), ());
uint32_t byteCount = m_normals.size() * sizeof(gpu::TextDynamicVertex);
void * buffer = mutator->AllocateMutationBuffer(byteCount);
memcpy(buffer, m_normals.data(), byteCount);
dp::MutateNode mutateNode;
mutateNode.m_region = node.second;
mutateNode.m_data = dp::MakeStackRefPointer(buffer);
mutator->AddMutation(node.first, mutateNode);
}
private:
m2::SharedSpline m_spline;
m2::Spline::iterator m_centerPointIter;
gpu::TTextDynamicVertexBuffer m_normals;
df::SharedTextLayout m_layout;
};
}
namespace df
{
PathTextShape::PathTextShape(m2::SharedSpline const & spline,
PathTextViewParams const & params)
: m_spline(spline)
, m_params(params)
{
}
void PathTextShape::Draw(dp::RefPointer<dp::Batcher> batcher, dp::RefPointer<dp::TextureManager> textures) const
{
PathTextLayout * layout = new PathTextLayout(strings::MakeUniString(m_params.m_text),
m_params.m_textFont.m_size,
textures);
uint32_t glyphCount = layout->GetGlyphCount();
if (glyphCount == 0)
return;
//we leave a little space on either side of the text that would
//remove the comparison for equality of spline portions
float const TextBorder = 4.0f;
float const textLength = TextBorder + layout->GetPixelLength();
float const textHalfLength = textLength / 2.0f;
float const pathGlbLength = m_spline->GetLength();
// on next readable scale m_scaleGtoP will be twice
if (textLength > pathGlbLength * 2 * m_params.m_baseGtoPScale)
return;
float const pathLength = m_params.m_baseGtoPScale * m_spline->GetLength();
/// copied from old code
/// @todo Choose best constant for minimal space.
float const etalonEmpty = max(200 * df::VisualParams::Instance().GetVisualScale(), (double)textLength);
float const minPeriodSize = etalonEmpty + textLength;
float const twoTextAndEmpty = minPeriodSize + textLength;
buffer_vector<float, 32> offsets;
float const scalePtoG = 1.0f / m_params.m_baseGtoPScale;
if (pathLength < twoTextAndEmpty)
{
// if we can't place 2 text and empty part on path
// we place only one text on center of path
offsets.push_back(pathGlbLength / 2.0f);
}
else if (pathLength < twoTextAndEmpty + minPeriodSize)
{
// if we can't place 3 text and 2 empty path
// we place 2 text with empty space beetwen
// and some offset from path end
float const endOffset = (pathLength - (2 * textLength + etalonEmpty)) / 2;
// division on m_scaleGtoP give as global coord frame (Mercator)
offsets.push_back((endOffset + textHalfLength) * scalePtoG);
offsets.push_back((pathLength - (textHalfLength + endOffset)) * scalePtoG);
}
else
{
// here we place 2 text on the ends of path
// then we place as much as possible text on center path uniformly
offsets.push_back(textHalfLength * scalePtoG);
offsets.push_back((pathLength - textHalfLength) * scalePtoG);
float const emptySpace = pathLength - 2 * textLength;
uint32_t textCount = static_cast<uint32_t>(ceil(emptySpace / minPeriodSize));
float const offset = (emptySpace - textCount * textLength) / (textCount + 1);
for (size_t i = 0; i < textCount; ++i)
offsets.push_back((textHalfLength + (textLength + offset) * (i + 1)) * scalePtoG);
}
dp::TextureManager::ColorRegion color;
dp::TextureManager::ColorRegion outline;
textures->GetColorRegion(m_params.m_textFont.m_color, color);
textures->GetColorRegion(m_params.m_textFont.m_outlineColor, outline);
dp::GLState state(gpu::TEXT_PROGRAM, dp::GLState::OverlayLayer);
state.SetBlending(dp::Blending(true));
state.SetColorTexture(color.GetTexture());
state.SetMaskTexture(layout->GetMaskTexture());
ASSERT(!offsets.empty(), ());
gpu::TTextStaticVertexBuffer staticBuffer;
gpu::TTextDynamicVertexBuffer dynBuffer;
SharedTextLayout layoutPtr(layout);
for (float offset : offsets)
{
staticBuffer.clear();
dynBuffer.clear();
Spline::iterator iter = m_spline.CreateIterator();
iter.Advance(offset);
layout->CacheStaticGeometry(glsl::vec3(glsl::ToVec2(iter.m_pos), m_params.m_depth),
color, outline, staticBuffer);
dynBuffer.resize(staticBuffer.size(), gpu::TextDynamicVertex(glsl::vec2(0.0, 0.0)));
dp::AttributeProvider provider(2, staticBuffer.size());
provider.InitStream(0, gpu::TextStaticVertex::GetBindingInfo(), dp::MakeStackRefPointer<void>(staticBuffer.data()));
provider.InitStream(1, gpu::TextDynamicVertex::GetBindingInfo(), dp::MakeStackRefPointer<void>(dynBuffer.data()));
dp::OverlayHandle * handle = new PathTextHandle(m_spline, layoutPtr, offset, m_params.m_depth);
batcher->InsertListOfStrip(state, dp::MakeStackRefPointer(&provider), dp::MovePointer(handle), 4);
}
}
}
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