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obs-studio/plugins/obs-text/gdiplus/obs-text.cpp

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#include <graphics/math-defs.h>
#include <util/platform.h>
#include <util/util.hpp>
#include <obs-module.h>
#include <sys/stat.h>
#include <windows.h>
#include <gdiplus.h>
#include <algorithm>
#include <string>
#include <memory>
#include <locale>
using namespace std;
using namespace Gdiplus;
#define warning(format, ...) \
blog(LOG_WARNING, "[%s] " format, obs_source_get_name(source), \
##__VA_ARGS__)
#define warn_stat(call) \
do { \
if (stat != Ok) \
warning("%s: %s failed (%d)", __FUNCTION__, call, \
(int)stat); \
} while (false)
#ifndef clamp
#define clamp(val, min_val, max_val) \
if (val < min_val) \
val = min_val; \
else if (val > max_val) \
val = max_val;
#endif
#define MIN_SIZE_CX 2
#define MIN_SIZE_CY 2
#define MAX_SIZE_CX 16384
#define MAX_SIZE_CY 16384
#define MAX_AREA (4096LL * 4096LL)
/* ------------------------------------------------------------------------- */
/* clang-format off */
#define S_FONT "font"
#define S_USE_FILE "read_from_file"
#define S_FILE "file"
#define S_TEXT "text"
#define S_COLOR "color"
#define S_GRADIENT "gradient"
#define S_GRADIENT_COLOR "gradient_color"
#define S_GRADIENT_DIR "gradient_dir"
#define S_GRADIENT_OPACITY "gradient_opacity"
#define S_ALIGN "align"
#define S_VALIGN "valign"
#define S_OPACITY "opacity"
#define S_BKCOLOR "bk_color"
#define S_BKOPACITY "bk_opacity"
#define S_VERTICAL "vertical"
#define S_OUTLINE "outline"
#define S_OUTLINE_SIZE "outline_size"
#define S_OUTLINE_COLOR "outline_color"
#define S_OUTLINE_OPACITY "outline_opacity"
#define S_CHATLOG_MODE "chatlog"
#define S_CHATLOG_LINES "chatlog_lines"
#define S_EXTENTS "extents"
#define S_EXTENTS_WRAP "extents_wrap"
#define S_EXTENTS_CX "extents_cx"
#define S_EXTENTS_CY "extents_cy"
#define S_TRANSFORM "transform"
#define S_ANTIALIASING "antialiasing"
#define S_ALIGN_LEFT "left"
#define S_ALIGN_CENTER "center"
#define S_ALIGN_RIGHT "right"
#define S_VALIGN_TOP "top"
#define S_VALIGN_CENTER S_ALIGN_CENTER
#define S_VALIGN_BOTTOM "bottom"
#define S_TRANSFORM_NONE 0
#define S_TRANSFORM_UPPERCASE 1
#define S_TRANSFORM_LOWERCASE 2
#define S_TRANSFORM_STARTCASE 3
#define S_ANTIALIASING_NONE 0
#define S_ANTIALIASING_STANDARD 1
#define T_(v) obs_module_text(v)
#define T_FONT T_("Font")
#define T_USE_FILE T_("ReadFromFile")
#define T_FILE T_("TextFile")
#define T_TEXT T_("Text")
#define T_COLOR T_("Color")
#define T_GRADIENT T_("Gradient")
#define T_GRADIENT_COLOR T_("Gradient.Color")
#define T_GRADIENT_DIR T_("Gradient.Direction")
#define T_GRADIENT_OPACITY T_("Gradient.Opacity")
#define T_ALIGN T_("Alignment")
#define T_VALIGN T_("VerticalAlignment")
#define T_OPACITY T_("Opacity")
#define T_BKCOLOR T_("BkColor")
#define T_BKOPACITY T_("BkOpacity")
#define T_VERTICAL T_("Vertical")
#define T_OUTLINE T_("Outline")
#define T_OUTLINE_SIZE T_("Outline.Size")
#define T_OUTLINE_COLOR T_("Outline.Color")
#define T_OUTLINE_OPACITY T_("Outline.Opacity")
#define T_CHATLOG_MODE T_("ChatlogMode")
#define T_CHATLOG_LINES T_("ChatlogMode.Lines")
#define T_EXTENTS T_("UseCustomExtents")
#define T_EXTENTS_WRAP T_("UseCustomExtents.Wrap")
#define T_EXTENTS_CX T_("Width")
#define T_EXTENTS_CY T_("Height")
#define T_TRANSFORM T_("Transform")
#define T_ANTIALIASING T_("Antialiasing")
#define T_FILTER_TEXT_FILES T_("Filter.TextFiles")
#define T_FILTER_ALL_FILES T_("Filter.AllFiles")
#define T_ALIGN_LEFT T_("Alignment.Left")
#define T_ALIGN_CENTER T_("Alignment.Center")
#define T_ALIGN_RIGHT T_("Alignment.Right")
#define T_VALIGN_TOP T_("VerticalAlignment.Top")
#define T_VALIGN_CENTER T_ALIGN_CENTER
#define T_VALIGN_BOTTOM T_("VerticalAlignment.Bottom")
#define T_TRANSFORM_NONE T_("Transform.None")
#define T_TRANSFORM_UPPERCASE T_("Transform.Uppercase")
#define T_TRANSFORM_LOWERCASE T_("Transform.Lowercase")
#define T_TRANSFORM_STARTCASE T_("Transform.Startcase")
/* clang-format on */
/* ------------------------------------------------------------------------- */
static inline DWORD get_alpha_val(uint32_t opacity)
{
return ((opacity * 255 / 100) & 0xFF) << 24;
}
static inline DWORD calc_color(uint32_t color, uint32_t opacity)
{
return color & 0xFFFFFF | get_alpha_val(opacity);
}
static inline wstring to_wide(const char *utf8)
{
wstring text;
size_t len = os_utf8_to_wcs(utf8, 0, nullptr, 0);
text.resize(len);
if (len)
os_utf8_to_wcs(utf8, 0, &text[0], len + 1);
return text;
}
static inline uint32_t rgb_to_bgr(uint32_t rgb)
{
return ((rgb & 0xFF) << 16) | (rgb & 0xFF00) | ((rgb & 0xFF0000) >> 16);
}
/* ------------------------------------------------------------------------- */
template<typename T, typename T2, BOOL WINAPI deleter(T2)> class GDIObj {
T obj = nullptr;
inline GDIObj &Replace(T obj_)
{
if (obj)
deleter(obj);
obj = obj_;
return *this;
}
public:
inline GDIObj() {}
inline GDIObj(T obj_) : obj(obj_) {}
inline ~GDIObj() { deleter(obj); }
inline T operator=(T obj_)
{
Replace(obj_);
return obj;
}
inline operator T() const { return obj; }
inline bool operator==(T obj_) const { return obj == obj_; }
inline bool operator!=(T obj_) const { return obj != obj_; }
};
using HDCObj = GDIObj<HDC, HDC, DeleteDC>;
using HFONTObj = GDIObj<HFONT, HGDIOBJ, DeleteObject>;
using HBITMAPObj = GDIObj<HBITMAP, HGDIOBJ, DeleteObject>;
/* ------------------------------------------------------------------------- */
enum class Align {
Left,
Center,
Right,
};
enum class VAlign {
Top,
Center,
Bottom,
};
struct TextSource {
obs_source_t *source = nullptr;
gs_texture_t *tex = nullptr;
uint32_t cx = 0;
uint32_t cy = 0;
HDCObj hdc;
Graphics graphics;
HFONTObj hfont;
unique_ptr<Font> font;
bool read_from_file = false;
string file;
time_t file_timestamp = 0;
bool update_file = false;
float update_time_elapsed = 0.0f;
wstring text;
wstring face;
int face_size = 0;
uint32_t color = 0xFFFFFF;
uint32_t color2 = 0xFFFFFF;
float gradient_dir = 0;
uint32_t opacity = 100;
uint32_t opacity2 = 100;
uint32_t bk_color = 0;
uint32_t bk_opacity = 0;
Align align = Align::Left;
VAlign valign = VAlign::Top;
bool gradient = false;
bool bold = false;
bool italic = false;
bool underline = false;
bool strikeout = false;
bool antialiasing = true;
bool vertical = false;
bool use_outline = false;
float outline_size = 0.0f;
uint32_t outline_color = 0;
uint32_t outline_opacity = 100;
bool use_extents = false;
bool wrap = false;
uint32_t extents_cx = 0;
uint32_t extents_cy = 0;
int text_transform = S_TRANSFORM_NONE;
bool chatlog_mode = false;
int chatlog_lines = 6;
/* --------------------------- */
inline TextSource(obs_source_t *source_, obs_data_t *settings)
: source(source_),
hdc(CreateCompatibleDC(nullptr)),
graphics(hdc)
{
obs_source_update(source, settings);
}
inline ~TextSource()
{
if (tex) {
obs_enter_graphics();
gs_texture_destroy(tex);
obs_leave_graphics();
}
}
void UpdateFont();
void GetStringFormat(StringFormat &format);
void RemoveNewlinePadding(const StringFormat &format, RectF &box);
void CalculateTextSizes(const StringFormat &format, RectF &bounding_box,
SIZE &text_size);
void RenderOutlineText(Graphics &graphics, const GraphicsPath &path,
const Brush &brush);
void RenderText();
void LoadFileText();
void TransformText();
void SetAntiAliasing(Graphics &graphics_bitmap);
const char *GetMainString(const char *str);
inline void Update(obs_data_t *settings);
inline void Tick(float seconds);
inline void Render();
};
static time_t get_modified_timestamp(const char *filename)
{
struct stat stats;
if (os_stat(filename, &stats) != 0)
return -1;
return stats.st_mtime;
}
void TextSource::UpdateFont()
{
hfont = nullptr;
font.reset(nullptr);
LOGFONT lf = {};
lf.lfHeight = face_size;
lf.lfWeight = bold ? FW_BOLD : FW_DONTCARE;
lf.lfItalic = italic;
lf.lfUnderline = underline;
lf.lfStrikeOut = strikeout;
lf.lfQuality = ANTIALIASED_QUALITY;
lf.lfCharSet = DEFAULT_CHARSET;
if (!face.empty()) {
wcscpy(lf.lfFaceName, face.c_str());
hfont = CreateFontIndirect(&lf);
}
if (!hfont) {
wcscpy(lf.lfFaceName, L"Arial");
hfont = CreateFontIndirect(&lf);
}
if (hfont)
font.reset(new Font(hdc, hfont));
}
void TextSource::GetStringFormat(StringFormat &format)
{
UINT flags = StringFormatFlagsNoFitBlackBox |
StringFormatFlagsMeasureTrailingSpaces;
if (vertical)
flags |= StringFormatFlagsDirectionVertical |
StringFormatFlagsDirectionRightToLeft;
format.SetFormatFlags(flags);
format.SetTrimming(StringTrimmingWord);
switch (align) {
case Align::Left:
if (vertical)
format.SetLineAlignment(StringAlignmentFar);
else
format.SetAlignment(StringAlignmentNear);
break;
case Align::Center:
if (vertical)
format.SetLineAlignment(StringAlignmentCenter);
else
format.SetAlignment(StringAlignmentCenter);
break;
case Align::Right:
if (vertical)
format.SetLineAlignment(StringAlignmentNear);
else
format.SetAlignment(StringAlignmentFar);
}
switch (valign) {
case VAlign::Top:
if (vertical)
format.SetAlignment(StringAlignmentNear);
else
format.SetLineAlignment(StringAlignmentNear);
break;
case VAlign::Center:
if (vertical)
format.SetAlignment(StringAlignmentCenter);
else
format.SetLineAlignment(StringAlignmentCenter);
break;
case VAlign::Bottom:
if (vertical)
format.SetAlignment(StringAlignmentFar);
else
format.SetLineAlignment(StringAlignmentFar);
}
}
/* GDI+ treats '\n' as an extra character with an actual render size when
* calculating the texture size, so we have to calculate the size of '\n' to
* remove the padding. Because we always add a newline to the string, we
* also remove the extra unused newline. */
void TextSource::RemoveNewlinePadding(const StringFormat &format, RectF &box)
{
RectF before;
RectF after;
Status stat;
stat = graphics.MeasureString(L"W", 2, font.get(), PointF(0.0f, 0.0f),
&format, &before);
warn_stat("MeasureString (without newline)");
stat = graphics.MeasureString(L"W\n", 3, font.get(), PointF(0.0f, 0.0f),
&format, &after);
warn_stat("MeasureString (with newline)");
float offset_cx = after.Width - before.Width;
float offset_cy = after.Height - before.Height;
if (!vertical) {
if (offset_cx >= 1.0f)
offset_cx -= 1.0f;
if (valign == VAlign::Center)
box.Y -= offset_cy * 0.5f;
else if (valign == VAlign::Bottom)
box.Y -= offset_cy;
} else {
if (offset_cy >= 1.0f)
offset_cy -= 1.0f;
if (align == Align::Center)
box.X -= offset_cx * 0.5f;
else if (align == Align::Right)
box.X -= offset_cx;
}
box.Width -= offset_cx;
box.Height -= offset_cy;
}
void TextSource::CalculateTextSizes(const StringFormat &format,
RectF &bounding_box, SIZE &text_size)
{
RectF layout_box;
RectF temp_box;
Status stat;
if (!text.empty()) {
if (use_extents && wrap) {
layout_box.X = layout_box.Y = 0;
layout_box.Width = float(extents_cx);
layout_box.Height = float(extents_cy);
if (use_outline) {
layout_box.Width -= outline_size;
layout_box.Height -= outline_size;
}
stat = graphics.MeasureString(text.c_str(),
(int)text.size() + 1,
font.get(), layout_box,
&format, &bounding_box);
warn_stat("MeasureString (wrapped)");
temp_box = bounding_box;
} else {
stat = graphics.MeasureString(
text.c_str(), (int)text.size() + 1, font.get(),
PointF(0.0f, 0.0f), &format, &bounding_box);
warn_stat("MeasureString (non-wrapped)");
temp_box = bounding_box;
bounding_box.X = 0.0f;
bounding_box.Y = 0.0f;
RemoveNewlinePadding(format, bounding_box);
if (use_outline) {
bounding_box.Width += outline_size;
bounding_box.Height += outline_size;
}
}
}
if (vertical) {
if (bounding_box.Width < face_size) {
text_size.cx = face_size;
bounding_box.Width = float(face_size);
} else {
text_size.cx = LONG(bounding_box.Width + EPSILON);
}
text_size.cy = LONG(bounding_box.Height + EPSILON);
} else {
if (bounding_box.Height < face_size) {
text_size.cy = face_size;
bounding_box.Height = float(face_size);
} else {
text_size.cy = LONG(bounding_box.Height + EPSILON);
}
text_size.cx = LONG(bounding_box.Width + EPSILON);
}
if (use_extents) {
text_size.cx = extents_cx;
text_size.cy = extents_cy;
}
text_size.cx += text_size.cx % 2;
text_size.cy += text_size.cy % 2;
int64_t total_size = int64_t(text_size.cx) * int64_t(text_size.cy);
/* GPUs typically have texture size limitations */
clamp(text_size.cx, MIN_SIZE_CX, MAX_SIZE_CX);
clamp(text_size.cy, MIN_SIZE_CY, MAX_SIZE_CY);
/* avoid taking up too much VRAM */
if (total_size > MAX_AREA) {
if (text_size.cx > text_size.cy)
text_size.cx = (LONG)MAX_AREA / text_size.cy;
else
text_size.cy = (LONG)MAX_AREA / text_size.cx;
}
/* the internal text-rendering bounding box for is reset to
* its internal value in case the texture gets cut off */
bounding_box.Width = temp_box.Width;
bounding_box.Height = temp_box.Height;
}
void TextSource::RenderOutlineText(Graphics &graphics, const GraphicsPath &path,
const Brush &brush)
{
DWORD outline_rgba = calc_color(outline_color, outline_opacity);
Status stat;
Pen pen(Color(outline_rgba), outline_size);
stat = pen.SetLineJoin(LineJoinRound);
warn_stat("pen.SetLineJoin");
stat = graphics.DrawPath(&pen, &path);
warn_stat("graphics.DrawPath");
stat = graphics.FillPath(&brush, &path);
warn_stat("graphics.FillPath");
}
void TextSource::RenderText()
{
StringFormat format(StringFormat::GenericTypographic());
Status stat;
RectF box;
SIZE size;
GetStringFormat(format);
CalculateTextSizes(format, box, size);
unique_ptr<uint8_t[]> bits(new uint8_t[size.cx * size.cy * 4]);
Bitmap bitmap(size.cx, size.cy, 4 * size.cx, PixelFormat32bppARGB,
bits.get());
Graphics graphics_bitmap(&bitmap);
LinearGradientBrush brush(RectF(0, 0, (float)size.cx, (float)size.cy),
Color(calc_color(color, opacity)),
Color(calc_color(color2, opacity2)),
gradient_dir, 1);
DWORD full_bk_color = bk_color & 0xFFFFFF;
if (!text.empty() || use_extents)
full_bk_color |= get_alpha_val(bk_opacity);
if ((size.cx > box.Width || size.cy > box.Height) && !use_extents) {
stat = graphics_bitmap.Clear(Color(0));
warn_stat("graphics_bitmap.Clear");
SolidBrush bk_brush = Color(full_bk_color);
stat = graphics_bitmap.FillRectangle(&bk_brush, box);
warn_stat("graphics_bitmap.FillRectangle");
} else {
stat = graphics_bitmap.Clear(Color(full_bk_color));
warn_stat("graphics_bitmap.Clear");
}
graphics_bitmap.SetCompositingMode(CompositingModeSourceOver);
SetAntiAliasing(graphics_bitmap);
if (!text.empty()) {
if (use_outline) {
box.Offset(outline_size / 2, outline_size / 2);
FontFamily family;
GraphicsPath path;
font->GetFamily(&family);
stat = path.AddString(text.c_str(), (int)text.size(),
&family, font->GetStyle(),
font->GetSize(), box, &format);
warn_stat("path.AddString");
RenderOutlineText(graphics_bitmap, path, brush);
} else {
stat = graphics_bitmap.DrawString(text.c_str(),
(int)text.size(),
font.get(), box,
&format, &brush);
warn_stat("graphics_bitmap.DrawString");
}
}
if (!tex || (LONG)cx != size.cx || (LONG)cy != size.cy) {
obs_enter_graphics();
if (tex)
gs_texture_destroy(tex);
const uint8_t *data = (uint8_t *)bits.get();
tex = gs_texture_create(size.cx, size.cy, GS_BGRA, 1, &data,
GS_DYNAMIC);
obs_leave_graphics();
cx = (uint32_t)size.cx;
cy = (uint32_t)size.cy;
} else if (tex) {
obs_enter_graphics();
gs_texture_set_image(tex, bits.get(), size.cx * 4, false);
obs_leave_graphics();
}
}
const char *TextSource::GetMainString(const char *str)
{
if (!str)
return "";
if (!chatlog_mode || !chatlog_lines)
return str;
int lines = chatlog_lines;
size_t len = strlen(str);
if (!len)
return str;
const char *temp = str + len;
while (temp != str) {
temp--;
if (temp[0] == '\n' && temp[1] != 0) {
if (!--lines)
break;
}
}
return *temp == '\n' ? temp + 1 : temp;
}
void TextSource::LoadFileText()
{
BPtr<char> file_text = os_quick_read_utf8_file(file.c_str());
text = to_wide(GetMainString(file_text));
if (!text.empty() && text.back() != '\n')
text.push_back('\n');
}
void TextSource::TransformText()
{
const locale loc = locale(obs_get_locale());
const ctype<wchar_t> &f = use_facet<ctype<wchar_t>>(loc);
if (text_transform == S_TRANSFORM_UPPERCASE)
f.toupper(&text[0], &text[0] + text.size());
else if (text_transform == S_TRANSFORM_LOWERCASE)
f.tolower(&text[0], &text[0] + text.size());
else if (text_transform == S_TRANSFORM_STARTCASE) {
bool upper = true;
for (wstring::iterator it = text.begin(); it != text.end();
++it) {
const wchar_t upper_char = f.toupper(*it);
const wchar_t lower_char = f.tolower(*it);
if (upper && lower_char != upper_char) {
upper = false;
*it = upper_char;
} else if (lower_char != upper_char) {
*it = lower_char;
} else {
upper = iswspace(*it);
}
}
}
}
void TextSource::SetAntiAliasing(Graphics &graphics_bitmap)
{
if (!antialiasing) {
graphics_bitmap.SetTextRenderingHint(
TextRenderingHintSingleBitPerPixel);
graphics_bitmap.SetSmoothingMode(SmoothingModeNone);
return;
}
graphics_bitmap.SetTextRenderingHint(TextRenderingHintAntiAlias);
graphics_bitmap.SetSmoothingMode(SmoothingModeAntiAlias);
}
#define obs_data_get_uint32 (uint32_t) obs_data_get_int
inline void TextSource::Update(obs_data_t *s)
{
const char *new_text = obs_data_get_string(s, S_TEXT);
obs_data_t *font_obj = obs_data_get_obj(s, S_FONT);
const char *align_str = obs_data_get_string(s, S_ALIGN);
const char *valign_str = obs_data_get_string(s, S_VALIGN);
uint32_t new_color = obs_data_get_uint32(s, S_COLOR);
uint32_t new_opacity = obs_data_get_uint32(s, S_OPACITY);
bool gradient = obs_data_get_bool(s, S_GRADIENT);
uint32_t new_color2 = obs_data_get_uint32(s, S_GRADIENT_COLOR);
uint32_t new_opacity2 = obs_data_get_uint32(s, S_GRADIENT_OPACITY);
float new_grad_dir = (float)obs_data_get_double(s, S_GRADIENT_DIR);
bool new_vertical = obs_data_get_bool(s, S_VERTICAL);
bool new_outline = obs_data_get_bool(s, S_OUTLINE);
uint32_t new_o_color = obs_data_get_uint32(s, S_OUTLINE_COLOR);
uint32_t new_o_opacity = obs_data_get_uint32(s, S_OUTLINE_OPACITY);
uint32_t new_o_size = obs_data_get_uint32(s, S_OUTLINE_SIZE);
bool new_use_file = obs_data_get_bool(s, S_USE_FILE);
const char *new_file = obs_data_get_string(s, S_FILE);
bool new_chat_mode = obs_data_get_bool(s, S_CHATLOG_MODE);
int new_chat_lines = (int)obs_data_get_int(s, S_CHATLOG_LINES);
bool new_extents = obs_data_get_bool(s, S_EXTENTS);
bool new_extents_wrap = obs_data_get_bool(s, S_EXTENTS_WRAP);
uint32_t n_extents_cx = obs_data_get_uint32(s, S_EXTENTS_CX);
uint32_t n_extents_cy = obs_data_get_uint32(s, S_EXTENTS_CY);
int new_text_transform = (int)obs_data_get_int(s, S_TRANSFORM);
bool new_antialiasing = obs_data_get_bool(s, S_ANTIALIASING);
const char *font_face = obs_data_get_string(font_obj, "face");
int font_size = (int)obs_data_get_int(font_obj, "size");
int64_t font_flags = obs_data_get_int(font_obj, "flags");
bool new_bold = (font_flags & OBS_FONT_BOLD) != 0;
bool new_italic = (font_flags & OBS_FONT_ITALIC) != 0;
bool new_underline = (font_flags & OBS_FONT_UNDERLINE) != 0;
bool new_strikeout = (font_flags & OBS_FONT_STRIKEOUT) != 0;
uint32_t new_bk_color = obs_data_get_uint32(s, S_BKCOLOR);
uint32_t new_bk_opacity = obs_data_get_uint32(s, S_BKOPACITY);
/* ----------------------------- */
wstring new_face = to_wide(font_face);
if (new_face != face || face_size != font_size || new_bold != bold ||
new_italic != italic || new_underline != underline ||
new_strikeout != strikeout) {
face = new_face;
face_size = font_size;
bold = new_bold;
italic = new_italic;
underline = new_underline;
strikeout = new_strikeout;
UpdateFont();
}
/* ----------------------------- */
new_color = rgb_to_bgr(new_color);
new_color2 = rgb_to_bgr(new_color2);
new_o_color = rgb_to_bgr(new_o_color);
new_bk_color = rgb_to_bgr(new_bk_color);
color = new_color;
opacity = new_opacity;
color2 = new_color2;
opacity2 = new_opacity2;
gradient_dir = new_grad_dir;
vertical = new_vertical;
bk_color = new_bk_color;
bk_opacity = new_bk_opacity;
use_extents = new_extents;
wrap = new_extents_wrap;
extents_cx = n_extents_cx;
extents_cy = n_extents_cy;
text_transform = new_text_transform;
antialiasing = new_antialiasing;
if (!gradient) {
color2 = color;
opacity2 = opacity;
}
read_from_file = new_use_file;
chatlog_mode = new_chat_mode;
chatlog_lines = new_chat_lines;
if (read_from_file) {
file = new_file;
file_timestamp = get_modified_timestamp(new_file);
LoadFileText();
} else {
text = to_wide(GetMainString(new_text));
/* all text should end with newlines due to the fact that GDI+
* treats strings without newlines differently in terms of
* render size */
if (!text.empty())
text.push_back('\n');
}
TransformText();
use_outline = new_outline;
outline_color = new_o_color;
outline_opacity = new_o_opacity;
outline_size = roundf(float(new_o_size));
if (strcmp(align_str, S_ALIGN_CENTER) == 0)
align = Align::Center;
else if (strcmp(align_str, S_ALIGN_RIGHT) == 0)
align = Align::Right;
else
align = Align::Left;
if (strcmp(valign_str, S_VALIGN_CENTER) == 0)
valign = VAlign::Center;
else if (strcmp(valign_str, S_VALIGN_BOTTOM) == 0)
valign = VAlign::Bottom;
else
valign = VAlign::Top;
RenderText();
update_time_elapsed = 0.0f;
/* ----------------------------- */
obs_data_release(font_obj);
}
inline void TextSource::Tick(float seconds)
{
if (!read_from_file)
return;
update_time_elapsed += seconds;
if (update_time_elapsed >= 1.0f) {
time_t t = get_modified_timestamp(file.c_str());
update_time_elapsed = 0.0f;
if (update_file) {
LoadFileText();
TransformText();
RenderText();
update_file = false;
}
if (file_timestamp != t) {
file_timestamp = t;
update_file = true;
}
}
}
inline void TextSource::Render()
{
if (!tex)
return;
gs_effect_t *effect = obs_get_base_effect(OBS_EFFECT_DEFAULT);
gs_technique_t *tech = gs_effect_get_technique(effect, "Draw");
gs_technique_begin(tech);
gs_technique_begin_pass(tech, 0);
gs_effect_set_texture(gs_effect_get_param_by_name(effect, "image"),
tex);
gs_draw_sprite(tex, 0, cx, cy);
gs_technique_end_pass(tech);
gs_technique_end(tech);
}
/* ------------------------------------------------------------------------- */
static ULONG_PTR gdip_token = 0;
OBS_DECLARE_MODULE()
OBS_MODULE_USE_DEFAULT_LOCALE("obs-text", "en-US")
MODULE_EXPORT const char *obs_module_description(void)
{
return "Windows GDI+ text source";
}
#define set_vis(var, val, show) \
do { \
p = obs_properties_get(props, val); \
obs_property_set_visible(p, var == show); \
} while (false)
static bool use_file_changed(obs_properties_t *props, obs_property_t *p,
obs_data_t *s)
{
bool use_file = obs_data_get_bool(s, S_USE_FILE);
set_vis(use_file, S_TEXT, false);
set_vis(use_file, S_FILE, true);
return true;
}
static bool outline_changed(obs_properties_t *props, obs_property_t *p,
obs_data_t *s)
{
bool outline = obs_data_get_bool(s, S_OUTLINE);
set_vis(outline, S_OUTLINE_SIZE, true);
set_vis(outline, S_OUTLINE_COLOR, true);
set_vis(outline, S_OUTLINE_OPACITY, true);
return true;
}
static bool chatlog_mode_changed(obs_properties_t *props, obs_property_t *p,
obs_data_t *s)
{
bool chatlog_mode = obs_data_get_bool(s, S_CHATLOG_MODE);
set_vis(chatlog_mode, S_CHATLOG_LINES, true);
return true;
}
static bool gradient_changed(obs_properties_t *props, obs_property_t *p,
obs_data_t *s)
{
bool gradient = obs_data_get_bool(s, S_GRADIENT);
set_vis(gradient, S_GRADIENT_COLOR, true);
set_vis(gradient, S_GRADIENT_OPACITY, true);
set_vis(gradient, S_GRADIENT_DIR, true);
return true;
}
static bool extents_modified(obs_properties_t *props, obs_property_t *p,
obs_data_t *s)
{
bool use_extents = obs_data_get_bool(s, S_EXTENTS);
set_vis(use_extents, S_EXTENTS_WRAP, true);
set_vis(use_extents, S_EXTENTS_CX, true);
set_vis(use_extents, S_EXTENTS_CY, true);
return true;
}
#undef set_vis
static obs_properties_t *get_properties(void *data)
{
TextSource *s = reinterpret_cast<TextSource *>(data);
string path;
obs_properties_t *props = obs_properties_create();
obs_property_t *p;
obs_properties_add_font(props, S_FONT, T_FONT);
p = obs_properties_add_bool(props, S_USE_FILE, T_USE_FILE);
obs_property_set_modified_callback(p, use_file_changed);
string filter;
filter += T_FILTER_TEXT_FILES;
filter += " (*.txt);;";
filter += T_FILTER_ALL_FILES;
filter += " (*.*)";
if (s && !s->file.empty()) {
const char *slash;
path = s->file;
replace(path.begin(), path.end(), '\\', '/');
slash = strrchr(path.c_str(), '/');
if (slash)
path.resize(slash - path.c_str() + 1);
}
obs_properties_add_text(props, S_TEXT, T_TEXT, OBS_TEXT_MULTILINE);
obs_properties_add_path(props, S_FILE, T_FILE, OBS_PATH_FILE,
filter.c_str(), path.c_str());
obs_properties_add_bool(props, S_ANTIALIASING, T_ANTIALIASING);
p = obs_properties_add_list(props, S_TRANSFORM, T_TRANSFORM,
OBS_COMBO_TYPE_LIST, OBS_COMBO_FORMAT_INT);
obs_property_list_add_int(p, T_TRANSFORM_NONE, S_TRANSFORM_NONE);
obs_property_list_add_int(p, T_TRANSFORM_UPPERCASE,
S_TRANSFORM_UPPERCASE);
obs_property_list_add_int(p, T_TRANSFORM_LOWERCASE,
S_TRANSFORM_LOWERCASE);
obs_property_list_add_int(p, T_TRANSFORM_STARTCASE,
S_TRANSFORM_STARTCASE);
obs_properties_add_bool(props, S_VERTICAL, T_VERTICAL);
obs_properties_add_color(props, S_COLOR, T_COLOR);
p = obs_properties_add_int_slider(props, S_OPACITY, T_OPACITY, 0, 100,
1);
obs_property_int_set_suffix(p, "%");
p = obs_properties_add_bool(props, S_GRADIENT, T_GRADIENT);
obs_property_set_modified_callback(p, gradient_changed);
obs_properties_add_color(props, S_GRADIENT_COLOR, T_GRADIENT_COLOR);
p = obs_properties_add_int_slider(props, S_GRADIENT_OPACITY,
T_GRADIENT_OPACITY, 0, 100, 1);
obs_property_int_set_suffix(p, "%");
obs_properties_add_float_slider(props, S_GRADIENT_DIR, T_GRADIENT_DIR,
0, 360, 0.1);
obs_properties_add_color(props, S_BKCOLOR, T_BKCOLOR);
p = obs_properties_add_int_slider(props, S_BKOPACITY, T_BKOPACITY, 0,
100, 1);
obs_property_int_set_suffix(p, "%");
p = obs_properties_add_list(props, S_ALIGN, T_ALIGN,
OBS_COMBO_TYPE_LIST,
OBS_COMBO_FORMAT_STRING);
obs_property_list_add_string(p, T_ALIGN_LEFT, S_ALIGN_LEFT);
obs_property_list_add_string(p, T_ALIGN_CENTER, S_ALIGN_CENTER);
obs_property_list_add_string(p, T_ALIGN_RIGHT, S_ALIGN_RIGHT);
p = obs_properties_add_list(props, S_VALIGN, T_VALIGN,
OBS_COMBO_TYPE_LIST,
OBS_COMBO_FORMAT_STRING);
obs_property_list_add_string(p, T_VALIGN_TOP, S_VALIGN_TOP);
obs_property_list_add_string(p, T_VALIGN_CENTER, S_VALIGN_CENTER);
obs_property_list_add_string(p, T_VALIGN_BOTTOM, S_VALIGN_BOTTOM);
p = obs_properties_add_bool(props, S_OUTLINE, T_OUTLINE);
obs_property_set_modified_callback(p, outline_changed);
obs_properties_add_int(props, S_OUTLINE_SIZE, T_OUTLINE_SIZE, 1, 20, 1);
obs_properties_add_color(props, S_OUTLINE_COLOR, T_OUTLINE_COLOR);
p = obs_properties_add_int_slider(props, S_OUTLINE_OPACITY,
T_OUTLINE_OPACITY, 0, 100, 1);
obs_property_int_set_suffix(p, "%");
p = obs_properties_add_bool(props, S_CHATLOG_MODE, T_CHATLOG_MODE);
obs_property_set_modified_callback(p, chatlog_mode_changed);
obs_properties_add_int(props, S_CHATLOG_LINES, T_CHATLOG_LINES, 1, 1000,
1);
p = obs_properties_add_bool(props, S_EXTENTS, T_EXTENTS);
obs_property_set_modified_callback(p, extents_modified);
obs_properties_add_int(props, S_EXTENTS_CX, T_EXTENTS_CX, 32, 8000, 1);
obs_properties_add_int(props, S_EXTENTS_CY, T_EXTENTS_CY, 32, 8000, 1);
obs_properties_add_bool(props, S_EXTENTS_WRAP, T_EXTENTS_WRAP);
return props;
}
static void defaults(obs_data_t *settings, int ver)
{
obs_data_t *font_obj = obs_data_create();
obs_data_set_default_string(font_obj, "face", "Arial");
obs_data_set_default_int(font_obj, "size", ver == 1 ? 36 : 256);
obs_data_set_default_obj(settings, S_FONT, font_obj);
obs_data_set_default_string(settings, S_ALIGN, S_ALIGN_LEFT);
obs_data_set_default_string(settings, S_VALIGN, S_VALIGN_TOP);
obs_data_set_default_int(settings, S_COLOR, 0xFFFFFF);
obs_data_set_default_int(settings, S_OPACITY, 100);
obs_data_set_default_int(settings, S_GRADIENT_COLOR, 0xFFFFFF);
obs_data_set_default_int(settings, S_GRADIENT_OPACITY, 100);
obs_data_set_default_double(settings, S_GRADIENT_DIR, 90.0);
obs_data_set_default_int(settings, S_BKCOLOR, 0x000000);
obs_data_set_default_int(settings, S_BKOPACITY, 0);
obs_data_set_default_int(settings, S_OUTLINE_SIZE, 2);
obs_data_set_default_int(settings, S_OUTLINE_COLOR, 0xFFFFFF);
obs_data_set_default_int(settings, S_OUTLINE_OPACITY, 100);
obs_data_set_default_int(settings, S_CHATLOG_LINES, 6);
obs_data_set_default_bool(settings, S_EXTENTS_WRAP, true);
obs_data_set_default_int(settings, S_EXTENTS_CX, 100);
obs_data_set_default_int(settings, S_EXTENTS_CY, 100);
obs_data_set_default_int(settings, S_TRANSFORM, S_TRANSFORM_NONE);
obs_data_set_default_bool(settings, S_ANTIALIASING, true);
obs_data_release(font_obj);
};
bool obs_module_load(void)
{
obs_source_info si = {};
si.id = "text_gdiplus";
si.type = OBS_SOURCE_TYPE_INPUT;
si.output_flags = OBS_SOURCE_VIDEO | OBS_SOURCE_CUSTOM_DRAW |
OBS_SOURCE_CAP_OBSOLETE;
si.get_properties = get_properties;
si.icon_type = OBS_ICON_TYPE_TEXT;
si.get_name = [](void *) { return obs_module_text("TextGDIPlus"); };
si.create = [](obs_data_t *settings, obs_source_t *source) {
return (void *)new TextSource(source, settings);
};
si.destroy = [](void *data) {
delete reinterpret_cast<TextSource *>(data);
};
si.get_width = [](void *data) {
return reinterpret_cast<TextSource *>(data)->cx;
};
si.get_height = [](void *data) {
return reinterpret_cast<TextSource *>(data)->cy;
};
si.get_defaults = [](obs_data_t *settings) { defaults(settings, 1); };
si.update = [](void *data, obs_data_t *settings) {
reinterpret_cast<TextSource *>(data)->Update(settings);
};
si.video_tick = [](void *data, float seconds) {
reinterpret_cast<TextSource *>(data)->Tick(seconds);
};
si.video_render = [](void *data, gs_effect_t *) {
reinterpret_cast<TextSource *>(data)->Render();
};
obs_source_info si_v2 = si;
si_v2.version = 2;
si_v2.output_flags &= ~OBS_SOURCE_CAP_OBSOLETE;
si_v2.get_defaults = [](obs_data_t *settings) {
defaults(settings, 2);
};
obs_register_source(&si);
obs_register_source(&si_v2);
const GdiplusStartupInput gdip_input;
GdiplusStartup(&gdip_token, &gdip_input, nullptr);
return true;
}
void obs_module_unload(void)
{
GdiplusShutdown(gdip_token);
}
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