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TextUnformatted: Using memchr(), fixed not properly testing for text_end bound + comments. 

Internals: Added ImStreolRange() + used in LogRenderedText() + comments.
This commit is contained in:
omar 2018-10-11 11:48:40 +02:00
parent d02b11dfbd
commit cf0afb48ac
4 changed files with 29 additions and 32 deletions
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2
docs/CHANGELOG.txt
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@ -56,6 +56,8 @@ Other Changes:
- BeginChild(): Fixed BeginChild(const char*, ...) variation erroneously not applying the ID stack
to the provided string to uniquely identify the child window. This was undoing an intentional change
introduced in 1.50 and broken in 1.60. (#1698, #894, #713).
- TextUnformatted(): Fixed a case where large-text path would read bytes past the text_end marker depending
on the position of new lines in the buffer (it wasn't affecting the output but still not the right thing to do!)
- BeginMenu(): Fixed menu popup horizontal offset being off the item in the menu bar when WindowPadding=0.0f.
- ArrowButton(): Fixed arrow shape being horizontally misaligned by (FramePadding.y-FramePadding.x) if they are different.
- Drag and Drop: Added GetDragDropPayload() to peek directly into the payload (if any) from anywhere. (#143)

41
imgui.cpp
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@ -1203,10 +1203,8 @@ char* ImStrdup(const char *str)
const char* ImStrchrRange(const char* str, const char* str_end, char c)
{
for ( ; str < str_end; str++)
if (*str == c)
return str;
return NULL;
const char* p = (const char*)memchr(str, (int)c, str_end - str);
return p;
}
int ImStrlenW(const ImWchar* str)
@ -1216,6 +1214,13 @@ int ImStrlenW(const ImWchar* str)
return n;
}
// Find end-of-line. Return pointer will point to either first \n, either str_end.
const char* ImStreolRange(const char* str, const char* str_end)
{
const char* p = (const char*)memchr(str, '\n', str_end - str);
return p ? p : str_end;
}
const ImWchar* ImStrbolW(const ImWchar* buf_mid_line, const ImWchar* buf_begin) // find beginning-of-line
{
while (buf_mid_line > buf_begin && buf_mid_line[-1] != '\n')
@ -8343,29 +8348,17 @@ void ImGui::LogRenderedText(const ImVec2* ref_pos, const char* text, const char*
for (;;)
{
// Split the string. Each new line (after a '\n') is followed by spacing corresponding to the current depth of our log entry.
const char* line_end = text_remaining;
while (line_end < text_end)
if (*line_end == '\n')
break;
else
line_end++;
if (line_end >= text_end)
line_end = NULL;
const bool is_first_line = (text == text_remaining);
bool is_last_line = false;
if (line_end == NULL)
const char* line_start = text_remaining;
const char* line_end = ImStreolRange(line_start, text_end);
const bool is_first_line = (line_start == text);
const bool is_last_line = (line_end == text_end);
if (!is_last_line || (line_start != line_end))
{
is_last_line = true;
line_end = text_end;
}
if (line_end != NULL && !(is_last_line && (line_end - text_remaining)==0))
{
const int char_count = (int)(line_end - text_remaining);
const int char_count = (int)(line_end - line_start);
if (log_new_line || !is_first_line)
LogText(IM_NEWLINE "%*s%.*s", tree_depth*4, "", char_count, text_remaining);
LogText(IM_NEWLINE "%*s%.*s", tree_depth*4, "", char_count, line_start);
else
LogText(" %.*s", char_count, text_remaining);
LogText(" %.*s", char_count, line_start);
}
if (is_last_line)

3
imgui_internal.h
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@ -141,7 +141,8 @@ IMGUI_API void ImStrncpy(char* dst, const char* src, size_t count);
IMGUI_API char* ImStrdup(const char* str);
IMGUI_API const char* ImStrchrRange(const char* str_begin, const char* str_end, char c);
IMGUI_API int ImStrlenW(const ImWchar* str);
IMGUI_API const ImWchar*ImStrbolW(const ImWchar* buf_mid_line, const ImWchar* buf_begin); // Find beginning-of-line
IMGUI_API const char* ImStreolRange(const char* str, const char* str_end); // End end-of-line
IMGUI_API const ImWchar*ImStrbolW(const ImWchar* buf_mid_line, const ImWchar* buf_begin); // Find beginning-of-line
IMGUI_API const char* ImStristr(const char* haystack, const char* haystack_end, const char* needle, const char* needle_end);
IMGUI_API void ImStrTrimBlanks(char* str);
IMGUI_API int ImFormatString(char* buf, size_t buf_size, const char* fmt, ...) IM_FMTARGS(3);

15
imgui_widgets.cpp
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@ -133,8 +133,9 @@ void ImGui::TextUnformatted(const char* text, const char* text_end)
{
// Long text!
// Perform manual coarse clipping to optimize for long multi-line text
// From this point we will only compute the width of lines that are visible. Optimization only available when word-wrapping is disabled.
// We also don't vertically center the text within the line full height, which is unlikely to matter because we are likely the biggest and only item on the line.
// - From this point we will only compute the width of lines that are visible. Optimization only available when word-wrapping is disabled.
// - We also don't vertically center the text within the line full height, which is unlikely to matter because we are likely the biggest and only item on the line.
// - We use memchr(), pay attention that well optimized versions of those str/mem functions are much faster than a casually written loop.
const char* line = text;
const float line_height = GetTextLineHeight();
const ImRect clip_rect = window->ClipRect;
@ -153,7 +154,7 @@ void ImGui::TextUnformatted(const char* text, const char* text_end)
int lines_skipped = 0;
while (line < text_end && lines_skipped < lines_skippable)
{
const char* line_end = strchr(line, '\n');
const char* line_end = (const char*)memchr(line, '\n', text_end - line);
if (!line_end)
line_end = text_end;
line = line_end + 1;
@ -169,15 +170,15 @@ void ImGui::TextUnformatted(const char* text, const char* text_end)
ImRect line_rect(pos, pos + ImVec2(FLT_MAX, line_height));
while (line < text_end)
{
const char* line_end = strchr(line, '\n');
if (IsClippedEx(line_rect, 0, false))
break;
const char* line_end = (const char*)memchr(line, '\n', text_end - line);
if (!line_end)
line_end = text_end;
const ImVec2 line_size = CalcTextSize(line, line_end, false);
text_size.x = ImMax(text_size.x, line_size.x);
RenderText(pos, line, line_end, false);
if (!line_end)
line_end = text_end;
line = line_end + 1;
line_rect.Min.y += line_height;
line_rect.Max.y += line_height;
@ -188,7 +189,7 @@ void ImGui::TextUnformatted(const char* text, const char* text_end)
int lines_skipped = 0;
while (line < text_end)
{
const char* line_end = strchr(line, '\n');
const char* line_end = (const char*)memchr(line, '\n', text_end - line);
if (!line_end)
line_end = text_end;
line = line_end + 1;