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ImFont: RenderText() useful directly without ImDrawList::AddText().. Changed prototype. Reserving vertices after skipping non-visible lead.

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This commit is contained in:
ocornut
2016-04-23 11:09:56 +02:00
parent fe73a23cf5
commit 44fb99542f
3 changed files with 28 additions and 32 deletions
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50
imgui_draw.cpp
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@ -918,14 +918,6 @@ void ImDrawList::AddText(const ImFont* font, float font_size, const ImVec2& pos,
IM_ASSERT(font->ContainerAtlas->TexID == _TextureIdStack.back()); // Use high-level ImGui::PushFont() or low-level ImDrawList::PushTextureId() to change font.
// reserve vertices for worse case (over-reserving is useful and easily amortized)
const int char_count = (int)(text_end - text_begin);
const int vtx_count_max = char_count * 4;
const int idx_count_max = char_count * 6;
const int vtx_begin = VtxBuffer.Size;
const int idx_begin = IdxBuffer.Size;
PrimReserve(idx_count_max, vtx_count_max);
ImVec4 clip_rect = _ClipRectStack.back();
if (cpu_fine_clip_rect)
{
@ -934,18 +926,7 @@ void ImDrawList::AddText(const ImFont* font, float font_size, const ImVec2& pos,
clip_rect.z = ImMin(clip_rect.z, cpu_fine_clip_rect->z);
clip_rect.w = ImMin(clip_rect.w, cpu_fine_clip_rect->w);
}
font->RenderText(font_size, pos, col, clip_rect, text_begin, text_end, this, wrap_width, cpu_fine_clip_rect != NULL);
// give back unused vertices
// FIXME-OPT: clean this up
VtxBuffer.resize((int)(_VtxWritePtr - VtxBuffer.Data));
IdxBuffer.resize((int)(_IdxWritePtr - IdxBuffer.Data));
int vtx_unused = vtx_count_max - (VtxBuffer.Size - vtx_begin);
int idx_unused = idx_count_max - (IdxBuffer.Size - idx_begin);
CmdBuffer.back().ElemCount -= idx_unused;
_VtxWritePtr -= vtx_unused;
_IdxWritePtr -= idx_unused;
_VtxCurrentIdx = (unsigned int)VtxBuffer.Size;
font->RenderText(this, font_size, pos, col, clip_rect, text_begin, text_end, wrap_width, cpu_fine_clip_rect != NULL);
}
void ImDrawList::AddText(const ImVec2& pos, ImU32 col, const char* text_begin, const char* text_end)
@ -1956,7 +1937,7 @@ void ImFont::RenderChar(ImDrawList* draw_list, float size, ImVec2 pos, ImU32 col
}
}
void ImFont::RenderText(float size, ImVec2 pos, ImU32 col, const ImVec4& clip_rect, const char* text_begin, const char* text_end, ImDrawList* draw_list, float wrap_width, bool cpu_fine_clip) const
void ImFont::RenderText(ImDrawList* draw_list, float size, ImVec2 pos, ImU32 col, const ImVec4& clip_rect, const char* text_begin, const char* text_end, float wrap_width, bool cpu_fine_clip) const
{
if (!text_end)
text_end = text_begin + strlen(text_begin);
@ -1974,14 +1955,22 @@ void ImFont::RenderText(float size, ImVec2 pos, ImU32 col, const ImVec4& clip_re
const bool word_wrap_enabled = (wrap_width > 0.0f);
const char* word_wrap_eol = NULL;
ImDrawVert* vtx_write = draw_list->_VtxWritePtr;
ImDrawIdx* idx_write = draw_list->_IdxWritePtr;
unsigned int vtx_current_idx = draw_list->_VtxCurrentIdx;
// Skip non-visible lines
const char* s = text_begin;
if (!word_wrap_enabled && y + line_height < clip_rect.y)
while (s < text_end && *s != '\n') // Fast-forward to next line
s++;
// Reserve vertices for remaining worse case (over-reserving is useful and easily amortized)
const int vtx_count_max = (int)(text_end - s) * 4;
const int idx_count_max = (int)(text_end - s) * 6;
const int idx_expected_size = draw_list->IdxBuffer.Size + idx_count_max;
draw_list->PrimReserve(idx_count_max, vtx_count_max);
ImDrawVert* vtx_write = draw_list->_VtxWritePtr;
ImDrawIdx* idx_write = draw_list->_IdxWritePtr;
unsigned int vtx_current_idx = draw_list->_VtxCurrentIdx;
while (s < text_end)
{
if (word_wrap_enabled)
@ -2050,11 +2039,10 @@ void ImFont::RenderText(float size, ImVec2 pos, ImU32 col, const ImVec4& clip_re
if (c != ' ' && c != '\t')
{
// We don't do a second finer clipping test on the Y axis as we've already skipped anything before clip_rect.y and exit once we pass clip_rect.w
float y1 = y + glyph->Y0 * scale;
float y2 = y + glyph->Y1 * scale;
float x1 = x + glyph->X0 * scale;
float x2 = x + glyph->X1 * scale;
float y1 = y + glyph->Y0 * scale;
float y2 = y + glyph->Y1 * scale;
if (x1 <= clip_rect.z && x2 >= clip_rect.x)
{
// Render a character
@ -2113,9 +2101,13 @@ void ImFont::RenderText(float size, ImVec2 pos, ImU32 col, const ImVec4& clip_re
x += char_width;
}
// Give back unused vertices
draw_list->VtxBuffer.resize((int)(vtx_write - draw_list->VtxBuffer.Data));
draw_list->IdxBuffer.resize((int)(idx_write - draw_list->IdxBuffer.Data));
draw_list->CmdBuffer[draw_list->CmdBuffer.Size-1].ElemCount -= (idx_expected_size - draw_list->IdxBuffer.Size);
draw_list->_VtxWritePtr = vtx_write;
draw_list->_VtxCurrentIdx = vtx_current_idx;
draw_list->_IdxWritePtr = idx_write;
draw_list->_VtxCurrentIdx = (unsigned int)draw_list->VtxBuffer.Size;
}
//-----------------------------------------------------------------------------