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/*
SDL_ttf: A companion library to SDL for working with TrueType (tm) fonts
Copyright (C) 2001-2025 Sam Lantinga <slouken@libsdl.org>
This software is provided 'as-is', without any express or implied
warranty. In no event will the authors be held liable for any damages
arising from the use of this software.
Permission is granted to anyone to use this software for any purpose,
including commercial applications, and to alter it and redistribute it
freely, subject to the following restrictions:
1. The origin of this software must not be misrepresented; you must not
claim that you wrote the original software. If you use this software
in a product, an acknowledgment in the product documentation would be
appreciated but is not required.
2. Altered source versions must be plainly marked as such, and must not be
misrepresented as being the original software.
3. This notice may not be removed or altered from any source distribution.
*/
#include <SDL3/SDL.h>
#include <SDL3_ttf/SDL_ttf.h>
#include <SDL3_ttf/SDL_textengine.h>
#include "SDL_hashtable.h"
#include <ft2build.h>
#include FT_FREETYPE_H
#include FT_OUTLINE_H
#include FT_STROKER_H
#include FT_GLYPH_H
#include FT_TRUETYPE_IDS_H
#include FT_TRUETYPE_TABLES_H
#include FT_IMAGE_H
/* Enable rendering with color
* Freetype may need to be compiled with FT_CONFIG_OPTION_USE_PNG */
#if defined(FT_HAS_COLOR)
# define TTF_USE_COLOR 1
#else
# define TTF_USE_COLOR 0
#endif
// Enable Signed Distance Field rendering (requires latest FreeType version)
#if defined(FT_RASTER_FLAG_SDF)
# define TTF_USE_SDF 1
#else
# define TTF_USE_SDF 0
#endif
#if TTF_USE_SDF
#include FT_MODULE_H
#endif
#define DEFAULT_SDF_SPREAD 8
/* Enable HarfBuzz for Complex text rendering
* Freetype may need to be compiled with FT_CONFIG_OPTION_USE_HARFBUZZ */
#ifndef TTF_USE_HARFBUZZ
# define TTF_USE_HARFBUZZ 0
#endif
// Enable PlutoSVG for color emoji rendering
#ifndef TTF_USE_PLUTOSVG
# define TTF_USE_PLUTOSVG 0
#endif
#ifndef TTF_DEFAULT_DPI
#define TTF_DEFAULT_DPI 72
#endif
// FT_FACE_FLAG_SVG and FT_HAS_SVG require freetype 2.12+
#ifndef FT_HAS_SVG
#define FT_FACE_FLAG_SVG ( 1L << 16 )
#define FT_HAS_SVG( face ) \
( !!( (face)->face_flags & FT_FACE_FLAG_SVG ) )
#define FT_GLYPH_FORMAT_SVG \
( ( (unsigned long)'S' << 24 ) | \
( (unsigned long)'V' << 16 ) | \
( (unsigned long)'G' << 8 ) | \
(unsigned long)' ' )
#endif // !FT_HAS_SVG
#define TTF_PROP_IOSTREAM_REFCOUNT "SDL_ttf.font.src.refcount"
/**
* ZERO WIDTH NO-BREAKSPACE (Unicode byte order mark)
*/
#define UNICODE_BOM_NATIVE 0xFEFF
#define UNICODE_BOM_SWAPPED 0xFFFE
#if defined(SDL_BUILD_MAJOR_VERSION)
SDL_COMPILE_TIME_ASSERT(SDL_BUILD_MAJOR_VERSION,
SDL_TTF_MAJOR_VERSION == SDL_BUILD_MAJOR_VERSION);
SDL_COMPILE_TIME_ASSERT(SDL_BUILD_MINOR_VERSION,
SDL_TTF_MINOR_VERSION == SDL_BUILD_MINOR_VERSION);
SDL_COMPILE_TIME_ASSERT(SDL_BUILD_MICRO_VERSION,
SDL_TTF_MICRO_VERSION == SDL_BUILD_MICRO_VERSION);
#endif
// Limited by its encoding in SDL_VERSIONNUM
SDL_COMPILE_TIME_ASSERT(SDL_TTF_MAJOR_VERSION_min, SDL_TTF_MAJOR_VERSION >= 0);
SDL_COMPILE_TIME_ASSERT(SDL_TTF_MAJOR_VERSION_max, SDL_TTF_MAJOR_VERSION <= 10);
SDL_COMPILE_TIME_ASSERT(SDL_TTF_MINOR_VERSION_min, SDL_TTF_MINOR_VERSION >= 0);
SDL_COMPILE_TIME_ASSERT(SDL_TTF_MINOR_VERSION_max, SDL_TTF_MINOR_VERSION <= 999);
SDL_COMPILE_TIME_ASSERT(SDL_TTF_MICRO_VERSION_min, SDL_TTF_MICRO_VERSION >= 0);
SDL_COMPILE_TIME_ASSERT(SDL_TTF_MICRO_VERSION_max, SDL_TTF_MICRO_VERSION <= 999);
#if TTF_USE_HARFBUZZ
#include <hb.h>
#include <hb-ft.h>
#endif
#if TTF_USE_PLUTOSVG
#include <plutosvg.h>
#endif
// Round glyph to 16 bytes width and use SSE2 instructions
#if defined(__SSE2__)
# define HAVE_SSE2_INTRINSICS 1
#include <emmintrin.h>
#endif
// Round glyph width to 16 bytes use NEON instructions
#if defined(__ARM_NEON)
# define HAVE_NEON_INTRINSICS 1
#include <arm_neon.h>
#endif
// Round glyph width to 8 bytes
#define HAVE_BLIT_GLYPH_64
/* Android armeabi-v7a doesn't like int64 (Maybe all other __ARM_ARCH < 7 ?),
* un-activate it, especially if NEON isn't detected */
#if defined(__ARM_ARCH)
# if __ARM_ARCH < 8
# if defined(HAVE_BLIT_GLYPH_64)
# undef HAVE_BLIT_GLYPH_64
# endif
# endif
#endif
// Default: round glyph width to 4 bytes to copy them faster
#define HAVE_BLIT_GLYPH_32
// Use Duff's device to unroll loops
//#define USE_DUFFS_LOOP
#if defined(HAVE_SSE2_INTRINSICS)
static SDL_INLINE int hasSSE2(void)
{
static int val = -1;
if (val != -1) {
return val;
}
val = SDL_HasSSE2();
return val;
}
#endif
#if defined(HAVE_NEON_INTRINSICS)
static SDL_INLINE int hasNEON(void)
{
static int val = -1;
if (val != -1) {
return val;
}
val = SDL_HasNEON();
return val;
}
#endif
/* FIXME: Right now we assume the gray-scale renderer Freetype is using
supports 256 shades of gray, but we should instead key off of num_grays
in the result FT_Bitmap after the FT_Render_Glyph() call. */
#define NUM_GRAYS 256
/* x offset = cos(((90.0-12)/360) * 2 * M_PI), or 12 degree angle */
// same value as in FT_GlyphSlot_Oblique, fixed point 16.16
#define GLYPH_ITALICS 0x0366AL
// Handy routines for converting from fixed point 26.6
#define FT_FLOOR(X) (int)(((X) & -64) / 64)
#define FT_CEIL(X) FT_FLOOR((X) + 63)
// Handy routine for converting to fixed point 26.6
#define F26Dot6(X) ((X) << 6)
/* Faster divide by 255, with same result
* in range [0; 255]: (x + 1 + (x >> 8)) >> 8
* in range [-255; 0]: (x + 255 + (x >> 8)) >> 8 */
#define DIVIDE_BY_255_SIGNED(x, sign_val) (((x) + (sign_val) + ((x)>>8)) >> 8)
// When x positive
#define DIVIDE_BY_255(x) DIVIDE_BY_255_SIGNED(x, 1)
#define CACHED_METRICS 0x20
#define CACHED_BITMAP 0x01
#define CACHED_PIXMAP 0x02
#define CACHED_COLOR 0x04
#define CACHED_LCD 0x08
#define CACHED_SUBPIX 0x10
typedef struct {
unsigned char *buffer; // aligned
int left;
int top;
int width;
int rows;
int pitch;
int is_color;
} TTF_Image;
// Cached glyph information
typedef struct cached_glyph {
int stored;
FT_UInt index;
TTF_Image bitmap;
TTF_Image pixmap;
int sz_left;
int sz_top;
int sz_width;
int sz_rows;
int advance;
union {
// TTF_HINTING_LIGHT_SUBPIXEL (only pixmap)
struct {
int lsb_minus_rsb;
int translation;
} subpixel;
// Other hinting
struct {
int rsb_delta;
int lsb_delta;
} kerning_smart;
};
} c_glyph;
/* Internal buffer to store positions computed by TTF_Size_Internal()
* for rendered string by Render_Line() */
typedef struct GlyphPosition {
TTF_Font *font;
FT_UInt index;
c_glyph *glyph;
int x_offset;
int y_offset;
int x_advance;
int y_advance;
int x;
int y;
int offset;
} GlyphPosition;
typedef struct GlyphPositions {
GlyphPosition *pos;
int len;
int width26dot6;
int height26dot6;
int num_clusters;
int maxlen;
} GlyphPositions;
typedef struct CachedGlyphPositions {
TTF_Direction direction;
Uint32 script;
char *text;
size_t length;
GlyphPositions positions;
} CachedGlyphPositions;
// A structure maintaining a list of fonts
typedef struct TTF_FontList {
TTF_Font *font;
struct TTF_FontList *next;
} TTF_FontList;
// The structure used to hold internal font information
struct TTF_Font {
// The name of the font
char *name;
// Freetype2 maintains all sorts of useful info itself
FT_Face face;
long face_index;
// Properties exposed to the application
SDL_PropertiesID props;
// The current font generation, changes when glyphs need to be rebuilt
Uint32 generation;
// Text objects using this font
SDL_HashTable *text;
// We'll cache these ourselves
float ptsize;
int hdpi;
int vdpi;
int height;
int ascent;
int descent;
int lineskip;
// The font style
TTF_FontStyleFlags style;
int weight;
int outline;
FT_Stroker stroker;
// Whether kerning is desired
bool enable_kerning;
#if !TTF_USE_HARFBUZZ
bool use_kerning;
#endif
// Extra width in glyph bounds for text styles
int glyph_overhang;
// Information in the font for underlining
int line_thickness;
int underline_top_row;
int strikethrough_top_row;
// Cache for style-transformed glyphs
SDL_HashTable *glyphs;
SDL_HashTable *glyph_indices;
// We are responsible for closing the font stream
SDL_IOStream *src;
Sint64 src_offset;
bool closeio;
FT_Open_Args args;
/* Internal buffer to store positions computed by TTF_Size_Internal()
* for rendered string by Render_Line() */
int next_cached_positions;
CachedGlyphPositions cached_positions[8];
GlyphPositions *positions;
// Hinting modes
int ft_load_target;
int render_subpixel;
#if TTF_USE_HARFBUZZ
hb_font_t *hb_font;
hb_language_t hb_language;
#endif
Uint32 script; // ISO 15924 script tag
TTF_Direction direction;
bool render_sdf;
// Extra layout setting for wrapped text
TTF_HorizontalAlignment horizontal_align;
// Fallback fonts
TTF_FontList *fallbacks;
TTF_FontList *fallback_for;
};
typedef struct
{
const char *text;
size_t length;
} TTF_Line;
// Tell if SDL_ttf has to handle the style
#define TTF_HANDLE_STYLE_BOLD(font) ((font)->style & TTF_STYLE_BOLD)
#define TTF_HANDLE_STYLE_ITALIC(font) ((font)->style & TTF_STYLE_ITALIC)
#define TTF_HANDLE_STYLE_UNDERLINE(font) ((font)->style & TTF_STYLE_UNDERLINE)
#define TTF_HANDLE_STYLE_STRIKETHROUGH(font) ((font)->style & TTF_STYLE_STRIKETHROUGH)
// Font styles that does not impact glyph drawing
#define TTF_STYLE_NO_GLYPH_CHANGE (TTF_STYLE_UNDERLINE | TTF_STYLE_STRIKETHROUGH)
// The FreeType font engine/library
static struct
{
SDL_InitState init;
SDL_AtomicInt refcount;
SDL_AtomicInt generation;
SDL_Mutex *lock;
FT_Library library;
} TTF_state;
#define TTF_CHECK_INITIALIZED(errval) \
if (SDL_ShouldInit(&TTF_state.init)) { \
SDL_SetInitialized(&TTF_state.init, false); \
SDL_SetError("Library not initialized"); \
return errval; \
}
#define TTF_CHECK_POINTER(name, p, errval) \
if (!(p)) { \
SDL_InvalidParamError(name); \
return errval; \
}
#define TTF_CHECK_FONT(font, errval) \
TTF_CHECK_POINTER("font", font, errval)
typedef enum {
RENDER_SOLID = 0,
RENDER_SHADED,
RENDER_BLENDED,
RENDER_LCD
} render_mode_t;
#define NO_MEASUREMENT \
false, 0, NULL, NULL
static Uint32 TTF_GetNextFontGeneration(void)
{
Uint32 id = (Uint32)SDL_AtomicIncRef(&TTF_state.generation) + 1;
if (id == 0) {
id = (Uint32)SDL_AtomicIncRef(&TTF_state.generation) + 1;
}
return id;
}
static bool Find_GlyphByIndex(TTF_Font *font, FT_UInt idx, int want_bitmap, int want_pixmap, int want_color, int want_lcd, int want_subpixel, int translation, c_glyph **out_glyph, TTF_Image **out_image);
#if defined(USE_DUFFS_LOOP)
// 4-times unrolled loop
#define DUFFS_LOOP4(pixel_copy_increment, width) \
{ int n = (width+3)/4; \
switch (width & 3) { \
case 0: do { pixel_copy_increment; /* fallthrough */ \
case 3: pixel_copy_increment; /* fallthrough */ \
case 2: pixel_copy_increment; /* fallthrough */ \
case 1: pixel_copy_increment; /* fallthrough */ \
} while (--n > 0); \
} \
}
#else
// Don't use Duff's device to unroll loops
#define DUFFS_LOOP(pixel_copy_increment, width) \
{ int n; \
for ( n=width; n > 0; --n ) { \
pixel_copy_increment; \
} \
}
#define DUFFS_LOOP4(pixel_copy_increment, width) \
DUFFS_LOOP(pixel_copy_increment, width)
#endif
// Blend colored glyphs
static void BG_Blended_Color(const TTF_Image *image, Uint32 *destination, Sint32 srcskip, Uint32 dstskip, Uint8 fg_alpha)
{
const Uint32 *src = (Uint32 *)image->buffer;
Uint32 *dst = destination;
Uint32 width = image->width;
Uint32 height = image->rows;
if (fg_alpha == SDL_ALPHA_OPAQUE) {
while (height--) {
/* *INDENT-OFF* */
DUFFS_LOOP4(
*dst++ = *src++;
, width);
/* *INDENT-ON* */
src = (const Uint32 *)((const Uint8 *)src + srcskip);
dst = (Uint32 *)((Uint8 *)dst + dstskip);
}
} else {
Uint32 alpha;
Uint32 tmp;
while (height--) {
/* *INDENT-OFF* */
DUFFS_LOOP4(
/* prevent misaligned load: tmp = *src++; */
// eventually, we can expect the compiler to replace the memcpy call with something optimized
SDL_memcpy(&tmp, src++, sizeof(tmp));
alpha = tmp >> 24;
tmp &= ~0xFF000000;
alpha = fg_alpha * alpha;
alpha = DIVIDE_BY_255(alpha) << 24;
*dst++ = tmp | alpha
, width);
/* *INDENT-ON* */
src = (const Uint32 *)((const Uint8 *)src + srcskip);
dst = (Uint32 *)((Uint8 *)dst + dstskip);
}
}
}
// Blend with LCD rendering
static void BG_Blended_LCD(const TTF_Image *image, Uint32 *destination, Sint32 srcskip, Uint32 dstskip, SDL_Color *fg)
{
const Uint32 *src = (Uint32 *)image->buffer;
Uint32 *dst = destination;
Uint32 width = image->width;
Uint32 height = image->rows;
Uint32 tmp, bg;
Uint32 r, g, b;
Uint8 fg_r, fg_g, fg_b;
Uint8 bg_r, bg_g, bg_b;
Uint32 bg_a;
fg_r = fg->r;
fg_g = fg->g;
fg_b = fg->b;
while (height--) {
/* *INDENT-OFF* */
DUFFS_LOOP4(
/* prevent misaligned load: tmp = *src++; */
SDL_memcpy(&tmp, src++, sizeof(tmp));
if (tmp) {
bg = *dst;
bg_a = bg & 0xff000000;
bg_r = (bg >> 16) & 0xff;
bg_g = (bg >> 8) & 0xff;
bg_b = (bg >> 0) & 0xff;
r = (tmp >> 16) & 0xff;
g = (tmp >> 8) & 0xff;
b = (tmp >> 0) & 0xff;
r = fg_r * r + bg_r * (255 - r) + 127;
r = DIVIDE_BY_255(r);
g = fg_g * g + bg_g * (255 - g) + 127;
g = DIVIDE_BY_255(g);
b = fg_b * b + bg_b * (255 - b) + 127;
b = DIVIDE_BY_255(b);
r <<= 16;
g <<= 8;
b <<= 0;
*dst = r | g | b | bg_a;
}
dst++;
, width);
/* *INDENT-ON* */
src = (const Uint32 *)((const Uint8 *)src + srcskip);
dst = (Uint32 *)((Uint8 *)dst + dstskip);
}
}
// Blended Opaque
static void BG_Blended_Opaque(const TTF_Image *image, Uint32 *destination, Sint32 srcskip, Uint32 dstskip)
{
const Uint8 *src = image->buffer;
Uint32 *dst = destination;
Uint32 width = image->width;
Uint32 height = image->rows;
while (height--) {
/* *INDENT-OFF* */
DUFFS_LOOP4(
*dst++ |= ((Uint32)*src++) << 24;
, width);
/* *INDENT-ON* */
src += srcskip;
dst = (Uint32 *)((Uint8 *)dst + dstskip);
}
}
// Blended non-opaque
static void BG_Blended(const TTF_Image *image, Uint32 *destination, Sint32 srcskip, Uint32 dstskip, Uint8 fg_alpha)
{
const Uint8 *src = image->buffer;
Uint32 *dst = destination;
Uint32 width = image->width;
Uint32 height = image->rows;
Uint32 tmp;
while (height--) {
/* *INDENT-OFF* */
DUFFS_LOOP4(
tmp = fg_alpha * (*src++);
*dst++ |= DIVIDE_BY_255(tmp) << 24;
, width);
/* *INDENT-ON* */
src += srcskip;
dst = (Uint32 *)((Uint8 *)dst + dstskip);
}
}
#if defined(HAVE_BLIT_GLYPH_32) || defined(HAVE_BLIT_GLYPH_64)
static void BG_Blended_Opaque_32(const TTF_Image *image, Uint32 *destination, Sint32 srcskip, Uint32 dstskip)
{
const Uint8 *src = image->buffer;
Uint32 *dst = destination;
Uint32 width = image->width / 4;
Uint32 height = image->rows;
while (height--) {
/* *INDENT-OFF* */
DUFFS_LOOP4(
*dst++ |= ((Uint32)*src++) << 24;
*dst++ |= ((Uint32)*src++) << 24;
*dst++ |= ((Uint32)*src++) << 24;
*dst++ |= ((Uint32)*src++) << 24;
, width);
/* *INDENT-ON* */
src += srcskip;
dst = (Uint32 *)((Uint8 *)dst + dstskip);
}
}
static void BG_Blended_32(const TTF_Image *image, Uint32 *destination, Sint32 srcskip, Uint32 dstskip, Uint8 fg_alpha)
{
const Uint8 *src = image->buffer;
Uint32 *dst = destination;
Uint32 width = image->width / 4;
Uint32 height = image->rows;
Uint32 tmp0, tmp1, tmp2, tmp3;
while (height--) {
/* *INDENT-OFF* */
DUFFS_LOOP4(
tmp0 = fg_alpha * (*src++);
tmp1 = fg_alpha * (*src++);
tmp2 = fg_alpha * (*src++);
tmp3 = fg_alpha * (*src++);
*dst++ |= DIVIDE_BY_255(tmp0) << 24;
*dst++ |= DIVIDE_BY_255(tmp1) << 24;
*dst++ |= DIVIDE_BY_255(tmp2) << 24;
*dst++ |= DIVIDE_BY_255(tmp3) << 24;
, width);
/* *INDENT-ON* */
src += srcskip;
dst = (Uint32 *)((Uint8 *)dst + dstskip);
}
}
#endif
#if defined(HAVE_SSE2_INTRINSICS)
// Apply: alpha_table[i] = i << 24;
static void BG_Blended_Opaque_SSE(const TTF_Image *image, Uint32 *destination, Sint32 srcskip, Uint32 dstskip)
{
const __m128i *src = (__m128i *)image->buffer;
__m128i *dst = (__m128i *)destination;
Uint32 width = image->width / 16;
Uint32 height = image->rows;
__m128i s, s0, s1, s2, s3, d0, d1, d2, d3, r0, r1, r2, r3, L, H;
const __m128i zero = _mm_setzero_si128();
while (height--) {
/* *INDENT-OFF* */
DUFFS_LOOP4(
// Read 16 Uint8 at once and put into 4 __m128i
s = _mm_loadu_si128(src); // load unaligned
d0 = _mm_load_si128(dst); // load
d1 = _mm_load_si128(dst + 1); // load
d2 = _mm_load_si128(dst + 2); // load
d3 = _mm_load_si128(dst + 3); // load
L = _mm_unpacklo_epi8(zero, s);
H = _mm_unpackhi_epi8(zero, s);
s0 = _mm_unpacklo_epi8(zero, L);
s1 = _mm_unpackhi_epi8(zero, L);
s2 = _mm_unpacklo_epi8(zero, H);
s3 = _mm_unpackhi_epi8(zero, H);
// already shifted by 24
r0 = _mm_or_si128(d0, s0); // or
r1 = _mm_or_si128(d1, s1); // or
r2 = _mm_or_si128(d2, s2); // or
r3 = _mm_or_si128(d3, s3); // or
_mm_store_si128(dst, r0); // store
_mm_store_si128(dst + 1, r1); // store
_mm_store_si128(dst + 2, r2); // store
_mm_store_si128(dst + 3, r3); // store
dst += 4;
src += 1;
, width);
/* *INDENT-ON* */
src = (const __m128i *)((const Uint8 *)src + srcskip);
dst = (__m128i *)((Uint8 *)dst + dstskip);
}
}
static void BG_Blended_SSE(const TTF_Image *image, Uint32 *destination, Sint32 srcskip, Uint32 dstskip, Uint8 fg_alpha)
{
const __m128i *src = (__m128i *)image->buffer;
__m128i *dst = (__m128i *)destination;
Uint32 width = image->width / 16;
Uint32 height = image->rows;
const __m128i alpha = _mm_set1_epi16(fg_alpha);
const __m128i >
const __m128i zero = _mm_setzero_si128();
__m128i s, s0, s1, s2, s3, d0, d1, d2, d3, r0, r1, r2, r3, L, H, Ls8, Hs8;
while (height--) {
/* *INDENT-OFF* */
DUFFS_LOOP4(
// Read 16 Uint8 at once and put into 4 __m128i
s = _mm_loadu_si128(src); // load unaligned
d0 = _mm_load_si128(dst); // load
d1 = _mm_load_si128(dst + 1); // load
d2 = _mm_load_si128(dst + 2); // load
d3 = _mm_load_si128(dst + 3); // load
L = _mm_unpacklo_epi8(s, zero); // interleave, no shifting
H = _mm_unpackhi_epi8(s, zero); // enough room to multiply
/* Apply: alpha_table[i] = ((i * fg.a / 255) << 24; */
// Divide by 255 is done as: (x + 1 + (x >> 8)) >> 8
L = _mm_mullo_epi16(L, alpha); // x := i * fg.a
H = _mm_mullo_epi16(H, alpha);
Ls8 = _mm_srli_epi16(L, 8); // x >> 8
Hs8 = _mm_srli_epi16(H, 8);
L = _mm_add_epi16(L, one); // x + 1
H = _mm_add_epi16(H, one);
L = _mm_add_epi16(L, Ls8); // x + 1 + (x >> 8)
H = _mm_add_epi16(H, Hs8);
L = _mm_srli_epi16(L, 8); // ((x + 1 + (x >> 8)) >> 8
H = _mm_srli_epi16(H, 8);
L = _mm_slli_epi16(L, 8); // shift << 8, so we're prepared
H = _mm_slli_epi16(H, 8); // to have final format << 24
s0 = _mm_unpacklo_epi8(zero, L);
s1 = _mm_unpackhi_epi8(zero, L);
s2 = _mm_unpacklo_epi8(zero, H);
s3 = _mm_unpackhi_epi8(zero, H);
// already shifted by 24
r0 = _mm_or_si128(d0, s0); // or
r1 = _mm_or_si128(d1, s1); // or
r2 = _mm_or_si128(d2, s2); // or
r3 = _mm_or_si128(d3, s3); // or
_mm_store_si128(dst, r0); // store
_mm_store_si128(dst + 1, r1); // store
_mm_store_si128(dst + 2, r2); // store
_mm_store_si128(dst + 3, r3); // store
dst += 4;
src += 1;
, width);
/* *INDENT-ON* */
src = (const __m128i *)((const Uint8 *)src + srcskip);
dst = (__m128i *)((Uint8 *)dst + dstskip);
}
}
#endif
#if defined(HAVE_NEON_INTRINSICS)
// Apply: alpha_table[i] = i << 24;
static void BG_Blended_Opaque_NEON(const TTF_Image *image, Uint32 *destination, Sint32 srcskip, Uint32 dstskip)
{
const Uint32 *src = (Uint32 *)image->buffer;
Uint32 *dst = destination;
Uint32 width = image->width / 16;
Uint32 height = image->rows;
uint32x4_t s, d0, d1, d2, d3, r0, r1, r2, r3;
uint8x16x2_t sx, sx01, sx23;
const uint8x16_t zero = vdupq_n_u8(0);
while (height--) {
/* *INDENT-OFF* */
DUFFS_LOOP4(
/* Read 4 Uint32 and put 16 Uint8 into uint32x4x2_t (uint8x16x2_t)
* takes advantage of vzipq_u8 which produces two lanes */
s = vld1q_u32(src); // load
d0 = vld1q_u32(dst); // load
d1 = vld1q_u32(dst + 4); // load
d2 = vld1q_u32(dst + 8); // load
d3 = vld1q_u32(dst + 12);
10479
// load
sx = vzipq_u8(zero, (uint8x16_t)s); // interleave
sx01 = vzipq_u8(zero, sx.val[0]); // interleave
sx23 = vzipq_u8(zero, sx.val[1]); // interleave
// already shifted by 24
r0 = vorrq_u32(d0, (uint32x4_t)sx01.val[0]); // or
r1 = vorrq_u32(d1, (uint32x4_t)sx01.val[1]); // or
r2 = vorrq_u32(d2, (uint32x4_t)sx23.val[0]); // or
r3 = vorrq_u32(d3, (uint32x4_t)sx23.val[1]); // or
vst1q_u32(dst, r0); // store
vst1q_u32(dst + 4, r1); // store
vst1q_u32(dst + 8, r2); // store
vst1q_u32(dst + 12, r3); // store
dst += 16;
src += 4;
, width);
/* *INDENT-ON* */
src = (const Uint32 *)((const Uint8 *)src + srcskip);
dst = (Uint32 *)((Uint8 *)dst + dstskip);
}
}
// Non-opaque, computes alpha blending on the fly
static void BG_Blended_NEON(const TTF_Image *image, Uint32 *destination, Sint32 srcskip, Uint32 dstskip, Uint8 fg_alpha)
{
const Uint32 *src = (Uint32 *)image->buffer;
Uint32 *dst = destination;
Uint32 width = image->width / 16;
Uint32 height = image->rows;
uint32x4_t s, d0, d1, d2, d3, r0, r1, r2, r3;
uint16x8_t Ls8, Hs8;
uint8x16x2_t sx, sx01, sx23;
uint16x8x2_t sxm;
const uint16x8_t alpha = vmovq_n_u16(fg_alpha);
const uint16x8_t >
const uint8x16_t zero = vdupq_n_u8(0);
while (height--) {
/* *INDENT-OFF* */
DUFFS_LOOP4(
/* Read 4 Uint32 and put 16 Uint8 into uint32x4x2_t (uint8x16x2_t)
* takes advantage of vzipq_u8 which produces two lanes */
s = vld1q_u32(src); // load
d0 = vld1q_u32(dst); // load
d1 = vld1q_u32(dst + 4); // load
d2 = vld1q_u32(dst + 8); // load
d3 = vld1q_u32(dst + 12); // load
sx = vzipq_u8((uint8x16_t)s, zero); // interleave, no shifting
// enough room to multiply
/* Apply: alpha_table[i] = ((i * fg.a / 255) << 24; */
// Divide by 255 is done as: (x + 1 + (x >> 8)) >> 8
sxm.val[0] = vmulq_u16((uint16x8_t)sx.val[0], alpha); // x := i * fg.a
sxm.val[1] = vmulq_u16((uint16x8_t)sx.val[1], alpha);
Ls8 = vshrq_n_u16(sxm.val[0], 8); // x >> 8
Hs8 = vshrq_n_u16(sxm.val[1], 8);
sxm.val[0] = vaddq_u16(sxm.val[0], one); // x + 1
sxm.val[1] = vaddq_u16(sxm.val[1], one);
sxm.val[0] = vaddq_u16(sxm.val[0], Ls8); // x + 1 + (x >> 8)
sxm.val[1] = vaddq_u16(sxm.val[1], Hs8);
sxm.val[0] = vshrq_n_u16(sxm.val[0], 8); // ((x + 1 + (x >> 8)) >> 8
sxm.val[1] = vshrq_n_u16(sxm.val[1], 8);
sxm.val[0] = vshlq_n_u16(sxm.val[0], 8); // shift << 8, so we're prepared
sxm.val[1] = vshlq_n_u16(sxm.val[1], 8); // to have final format << 24
sx01 = vzipq_u8(zero, (uint8x16_t)sxm.val[0]); // interleave
sx23 = vzipq_u8(zero, (uint8x16_t)sxm.val[1]); // interleave
// already shifted by 24
r0 = vorrq_u32(d0, (uint32x4_t)sx01.val[0]); // or
r1 = vorrq_u32(d1, (uint32x4_t)sx01.val[1]); // or
r2 = vorrq_u32(d2, (uint32x4_t)sx23.val[0]); // or
r3 = vorrq_u32(d3, (uint32x4_t)sx23.val[1]); // or
vst1q_u32(dst, r0); // store
vst1q_u32(dst + 4, r1); // store
vst1q_u32(dst + 8, r2); // store
vst1q_u32(dst + 12, r3); // store
dst += 16;
src += 4;
, width);
/* *INDENT-ON* */
src = (const Uint32 *)((const Uint8 *)src + srcskip);
dst = (Uint32 *)((Uint8 *)dst + dstskip);
}
}
#endif
static void BG(const TTF_Image *image, Uint8 *destination, Sint32 srcskip, Uint32 dstskip)
{
const Uint8 *src = image->buffer;
Uint8 *dst = destination;
Uint32 width = image->width;
Uint32 height = image->rows;
while (height--) {
/* *INDENT-OFF* */
DUFFS_LOOP4(
*dst++ |= *src++;
, width);
/* *INDENT-ON* */
src += srcskip;
dst += dstskip;
}
}
#if defined(HAVE_BLIT_GLYPH_64)
static void BG_64(const TTF_Image *image, Uint8 *destination, Sint32 srcskip, Uint32 dstskip)
{
const Uint64 *src = (Uint64 *)image->buffer;
Uint64 *dst = (Uint64 *)destination;
Uint32 width = image->width / 8;
Uint32 height = image->rows;
Uint64 tmp;
while (height--) {
/* *INDENT-OFF* */
DUFFS_LOOP4(
/* prevent misaligned load: *dst++ |= *src++; */
SDL_memcpy(&tmp, src++, sizeof(tmp));
*dst++ |= tmp;
, width);
/* *INDENT-ON* */
src = (const Uint64 *)((const Uint8 *)src + srcskip);
dst = (Uint64 *)((Uint8 *)dst + dstskip);
}
}
#elif defined(HAVE_BLIT_GLYPH_32)
static void BG_32(const TTF_Image *image, Uint8 *destination, Sint32 srcskip, Uint32 dstskip)
{
const Uint32 *src = (Uint32 *)image->buffer;
Uint32 *dst = (Uint32 *)destination;
Uint32 width = image->width / 4;
Uint32 height = image->rows;
Uint32 tmp;
while (height--) {
/* *INDENT-OFF* */
DUFFS_LOOP4(
/* prevent misaligned load: *dst++ |= *src++; */
SDL_memcpy(&tmp, src++, sizeof(tmp));
*dst++ |= tmp;
, width);
/* *INDENT-ON* */
src = (const Uint32 *)((const Uint8 *)src + srcskip);
dst = (Uint32 *)((Uint8 *)dst + dstskip);
}
}
#endif
#if defined(HAVE_SSE2_INTRINSICS)
static void BG_SSE(const TTF_Image *image, Uint8 *destination, Sint32 srcskip, Uint32 dstskip)
{
const __m128i *src = (__m128i *)image->buffer;
__m128i *dst = (__m128i *)destination;
Uint32 width = image->width / 16;
Uint32 height = image->rows;
__m128i s, d, r;
while (height--) {
/* *INDENT-OFF* */
DUFFS_LOOP4(
s = _mm_loadu_si128(src); // load unaligned
d = _mm_load_si128(dst); // load
r = _mm_or_si128(d, s); // or
_mm_store_si128(dst, r); // store
src += 1;
dst += 1;
, width);
/* *INDENT-ON* */
src = (const __m128i *)((const Uint8 *)src + srcskip);
dst = (__m128i *)((Uint8 *)dst + dstskip);
}
}
#endif
#if defined(HAVE_NEON_INTRINSICS)
static void BG_NEON(const TTF_Image *image, Uint8 *destination, Sint32 srcskip, Uint32 dstskip)
{
const Uint8 *src = image->buffer;
Uint8 *dst = destination;
Uint32 width = image->width / 16;
Uint32 height = image->rows;
uint8x16_t s, d, r;
while (height--) {
/* *INDENT-OFF* */
DUFFS_LOOP4(
s = vld1q_u8(src); // load
d = vld1q_u8(dst); // load
r = vorrq_u8(d, s); // or
vst1q_u8(dst, r); // store
src += 16;
dst += 16;
, width);
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