SDL_blit_0.c
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/*
Simple DirectMedia Layer
Copyright (C) 1997-2018 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 "../SDL_internal.h"
#include "SDL_video.h"
#include "SDL_blit.h"
/* Functions to blit from bitmaps to other surfaces */
static void
BlitBto1(SDL_BlitInfo * info)
{
int c;
int width, height;
Uint8 *src, *map, *dst;
int srcskip, dstskip;
/* Set up some basic variables */
width = info->dst_w;
height = info->dst_h;
src = info->src;
srcskip = info->src_skip;
dst = info->dst;
dstskip = info->dst_skip;
map = info->table;
srcskip += width - (width + 7) / 8;
if (map) {
while (height--) {
Uint8 byte = 0, bit;
for (c = 0; c < width; ++c) {
if ((c & 7) == 0) {
byte = *src++;
}
bit = (byte & 0x80) >> 7;
if (1) {
*dst = map[bit];
}
dst++;
byte <<= 1;
}
src += srcskip;
dst += dstskip;
}
} else {
while (height--) {
Uint8 byte = 0, bit;
for (c = 0; c < width; ++c) {
if ((c & 7) == 0) {
byte = *src++;
}
bit = (byte & 0x80) >> 7;
if (1) {
*dst = bit;
}
dst++;
byte <<= 1;
}
src += srcskip;
dst += dstskip;
}
}
}
static void
BlitBto2(SDL_BlitInfo * info)
{
int c;
int width, height;
Uint8 *src;
Uint16 *map, *dst;
int srcskip, dstskip;
/* Set up some basic variables */
width = info->dst_w;
height = info->dst_h;
src = info->src;
srcskip = info->src_skip;
dst = (Uint16 *) info->dst;
dstskip = info->dst_skip / 2;
map = (Uint16 *) info->table;
srcskip += width - (width + 7) / 8;
while (height--) {
Uint8 byte = 0, bit;
for (c = 0; c < width; ++c) {
if ((c & 7) == 0) {
byte = *src++;
}
bit = (byte & 0x80) >> 7;
if (1) {
*dst = map[bit];
}
byte <<= 1;
dst++;
}
src += srcskip;
dst += dstskip;
}
}
static void
BlitBto3(SDL_BlitInfo * info)
{
int c, o;
int width, height;
Uint8 *src, *map, *dst;
int srcskip, dstskip;
/* Set up some basic variables */
width = info->dst_w;
height = info->dst_h;
src = info->src;
srcskip = info->src_skip;
dst = info->dst;
dstskip = info->dst_skip;
map = info->table;
srcskip += width - (width + 7) / 8;
while (height--) {
Uint8 byte = 0, bit;
for (c = 0; c < width; ++c) {
if ((c & 7) == 0) {
byte = *src++;
}
bit = (byte & 0x80) >> 7;
if (1) {
o = bit * 4;
dst[0] = map[o++];
dst[1] = map[o++];
dst[2] = map[o++];
}
byte <<= 1;
dst += 3;
}
src += srcskip;
dst += dstskip;
}
}
static void
BlitBto4(SDL_BlitInfo * info)
{
int width, height;
Uint8 *src;
Uint32 *map, *dst;
int srcskip, dstskip;
int c;
/* Set up some basic variables */
width = info->dst_w;
height = info->dst_h;
src = info->src;
srcskip = info->src_skip;
dst = (Uint32 *) info->dst;
dstskip = info->dst_skip / 4;
map = (Uint32 *) info->table;
srcskip += width - (width + 7) / 8;
while (height--) {
Uint8 byte = 0, bit;
for (c = 0; c < width; ++c) {
if ((c & 7) == 0) {
byte = *src++;
}
bit = (byte & 0x80) >> 7;
if (1) {
*dst = map[bit];
}
byte <<= 1;
dst++;
}
src += srcskip;
dst += dstskip;
}
}
static void
BlitBto1Key(SDL_BlitInfo * info)
{
int width = info->dst_w;
int height = info->dst_h;
Uint8 *src = info->src;
Uint8 *dst = info->dst;
int srcskip = info->src_skip;
int dstskip = info->dst_skip;
Uint32 ckey = info->colorkey;
Uint8 *palmap = info->table;
int c;
/* Set up some basic variables */
srcskip += width - (width + 7) / 8;
if (palmap) {
while (height--) {
Uint8 byte = 0, bit;
for (c = 0; c < width; ++c) {
if ((c & 7) == 0) {
byte = *src++;
}
bit = (byte & 0x80) >> 7;
if (bit != ckey) {
*dst = palmap[bit];
}
dst++;
byte <<= 1;
}
src += srcskip;
dst += dstskip;
}
} else {
while (height--) {
Uint8 byte = 0, bit;
for (c = 0; c < width; ++c) {
if ((c & 7) == 0) {
byte = *src++;
}
bit = (byte & 0x80) >> 7;
if (bit != ckey) {
*dst = bit;
}
dst++;
byte <<= 1;
}
src += srcskip;
dst += dstskip;
}
}
}
static void
BlitBto2Key(SDL_BlitInfo * info)
{
int width = info->dst_w;
int height = info->dst_h;
Uint8 *src = info->src;
Uint16 *dstp = (Uint16 *) info->dst;
int srcskip = info->src_skip;
int dstskip = info->dst_skip;
Uint32 ckey = info->colorkey;
Uint8 *palmap = info->table;
int c;
/* Set up some basic variables */
srcskip += width - (width + 7) / 8;
dstskip /= 2;
while (height--) {
Uint8 byte = 0, bit;
for (c = 0; c < width; ++c) {
if ((c & 7) == 0) {
byte = *src++;
}
bit = (byte & 0x80) >> 7;
if (bit != ckey) {
*dstp = ((Uint16 *) palmap)[bit];
}
byte <<= 1;
dstp++;
}
src += srcskip;
dstp += dstskip;
}
}
static void
BlitBto3Key(SDL_BlitInfo * info)
{
int width = info->dst_w;
int height = info->dst_h;
Uint8 *src = info->src;
Uint8 *dst = info->dst;
int srcskip = info->src_skip;
int dstskip = info->dst_skip;
Uint32 ckey = info->colorkey;
Uint8 *palmap = info->table;
int c;
/* Set up some basic variables */
srcskip += width - (width + 7) / 8;
while (height--) {
Uint8 byte = 0, bit;
for (c = 0; c < width; ++c) {
if ((c & 7) == 0) {
byte = *src++;
}
bit = (byte & 0x80) >> 7;
if (bit != ckey) {
SDL_memcpy(dst, &palmap[bit * 4], 3);
}
byte <<= 1;
dst += 3;
}
src += srcskip;
dst += dstskip;
}
}
static void
BlitBto4Key(SDL_BlitInfo * info)
{
int width = info->dst_w;
int height = info->dst_h;
Uint8 *src = info->src;
Uint32 *dstp = (Uint32 *) info->dst;
int srcskip = info->src_skip;
int dstskip = info->dst_skip;
Uint32 ckey = info->colorkey;
Uint8 *palmap = info->table;
int c;
/* Set up some basic variables */
srcskip += width - (width + 7) / 8;
dstskip /= 4;
while (height--) {
Uint8 byte = 0, bit;
for (c = 0; c < width; ++c) {
if ((c & 7) == 0) {
byte = *src++;
}
bit = (byte & 0x80) >> 7;
if (bit != ckey) {
*dstp = ((Uint32 *) palmap)[bit];
}
byte <<= 1;
dstp++;
}
src += srcskip;
dstp += dstskip;
}
}
static void
BlitBtoNAlpha(SDL_BlitInfo * info)
{
int width = info->dst_w;
int height = info->dst_h;
Uint8 *src = info->src;
Uint8 *dst = info->dst;
int srcskip = info->src_skip;
int dstskip = info->dst_skip;
const SDL_Color *srcpal = info->src_fmt->palette->colors;
SDL_PixelFormat *dstfmt = info->dst_fmt;
int dstbpp;
int c;
Uint32 pixel;
unsigned sR, sG, sB;
unsigned dR, dG, dB, dA;
const unsigned A = info->a;
/* Set up some basic variables */
dstbpp = dstfmt->BytesPerPixel;
srcskip += width - (width + 7) / 8;
while (height--) {
Uint8 byte = 0, bit;
for (c = 0; c < width; ++c) {
if ((c & 7) == 0) {
byte = *src++;
}
bit = (byte & 0x80) >> 7;
if (1) {
sR = srcpal[bit].r;
sG = srcpal[bit].g;
sB = srcpal[bit].b;
DISEMBLE_RGBA(dst, dstbpp, dstfmt, pixel, dR, dG, dB, dA);
ALPHA_BLEND_RGBA(sR, sG, sB, A, dR, dG, dB, dA);
ASSEMBLE_RGBA(dst, dstbpp, dstfmt, dR, dG, dB, dA);
}
byte <<= 1;
dst += dstbpp;
}
src += srcskip;
dst += dstskip;
}
}
static void
BlitBtoNAlphaKey(SDL_BlitInfo * info)
{
int width = info->dst_w;
int height = info->dst_h;
Uint8 *src = info->src;
Uint8 *dst = info->dst;
int srcskip = info->src_skip;
int dstskip = info->dst_skip;
SDL_PixelFormat *srcfmt = info->src_fmt;
SDL_PixelFormat *dstfmt = info->dst_fmt;
const SDL_Color *srcpal = srcfmt->palette->colors;
int dstbpp;
int c;
Uint32 pixel;
unsigned sR, sG, sB;
unsigned dR, dG, dB, dA;
const unsigned A = info->a;
Uint32 ckey = info->colorkey;
/* Set up some basic variables */
dstbpp = dstfmt->BytesPerPixel;
srcskip += width - (width + 7) / 8;
while (height--) {
Uint8 byte = 0, bit;
for (c = 0; c < width; ++c) {
if ((c & 7) == 0) {
byte = *src++;
}
bit = (byte & 0x80) >> 7;
if (bit != ckey) {
sR = srcpal[bit].r;
sG = srcpal[bit].g;
sB = srcpal[bit].b;
DISEMBLE_RGBA(dst, dstbpp, dstfmt, pixel, dR, dG, dB, dA);
ALPHA_BLEND_RGBA(sR, sG, sB, A, dR, dG, dB, dA);
ASSEMBLE_RGBA(dst, dstbpp, dstfmt, dR, dG, dB, dA);
}
byte <<= 1;
dst += dstbpp;
}
src += srcskip;
dst += dstskip;
}
}
static const SDL_BlitFunc bitmap_blit[] = {
(SDL_BlitFunc) NULL, BlitBto1, BlitBto2, BlitBto3, BlitBto4
};
static const SDL_BlitFunc colorkey_blit[] = {
(SDL_BlitFunc) NULL, BlitBto1Key, BlitBto2Key, BlitBto3Key, BlitBto4Key
};
SDL_BlitFunc
SDL_CalculateBlit0(SDL_Surface * surface)
{
int which;
if (surface->format->BitsPerPixel != 1) {
/* We don't support sub 8-bit packed pixel modes */
return (SDL_BlitFunc) NULL;
}
if (surface->map->dst->format->BitsPerPixel < 8) {
which = 0;
} else {
which = surface->map->dst->format->BytesPerPixel;
}
switch (surface->map->info.flags & ~SDL_COPY_RLE_MASK) {
case 0:
return bitmap_blit[which];
case SDL_COPY_COLORKEY:
return colorkey_blit[which];
case SDL_COPY_MODULATE_ALPHA | SDL_COPY_BLEND:
return which >= 2 ? BlitBtoNAlpha : (SDL_BlitFunc) NULL;
case SDL_COPY_COLORKEY | SDL_COPY_MODULATE_ALPHA | SDL_COPY_BLEND:
return which >= 2 ? BlitBtoNAlphaKey : (SDL_BlitFunc) NULL;
}
return (SDL_BlitFunc) NULL;
}
/* vi: set ts=4 sw=4 expandtab: */
SDL_BlitInfo::table
Uint8 * table
Definition: SDL_blit.h:67
BlitBto2
static void BlitBto2(SDL_BlitInfo *info)
Definition: SDL_blit_0.c:84
BlitBto2Key
static void BlitBto2Key(SDL_BlitInfo *info)
Definition: SDL_blit_0.c:250
SDL_Color
Definition: SDL_pixels.h:295
SDL_COPY_COLORKEY
#define SDL_COPY_COLORKEY
Definition: SDL_blit.h:39
SDL_BlitInfo::src_skip
int src_skip
Definition: SDL_blit.h:60
SDL_Color::g
Uint8 g
Definition: SDL_pixels.h:298
dst
GLenum GLenum dst
Definition: SDL_opengl_glext.h:1737
BlitBto4
static void BlitBto4(SDL_BlitInfo *info)
Definition: SDL_blit_0.c:160
SDL_CalculateBlit0
SDL_BlitFunc SDL_CalculateBlit0(SDL_Surface *surface)
Definition: SDL_blit_0.c:454
ALPHA_BLEND_RGBA
#define ALPHA_BLEND_RGBA(sR, sG, sB, sA, dR, dG, dB, dA)
Definition: SDL_blit.h:454
BlitBto1Key
static void BlitBto1Key(SDL_BlitInfo *info)
Definition: SDL_blit_0.c:197
SDL_PixelFormat::BytesPerPixel
Uint8 BytesPerPixel
Definition: SDL_pixels.h:320
SDL_BlitInfo::flags
int flags
Definition: SDL_blit.h:68
SDL_BlitInfo::src_fmt
SDL_PixelFormat * src_fmt
Definition: SDL_blit.h:65
surface
EGLSurface surface
Definition: eglext.h:248
ASSEMBLE_RGBA
#define ASSEMBLE_RGBA(buf, bpp, fmt, r, g, b, a)
Definition: SDL_blit.h:402
SDL_Surface
A collection of pixels used in software blitting.
Definition: SDL_surface.h:69
BlitBto3Key
static void BlitBto3Key(SDL_BlitInfo *info)
Definition: SDL_blit_0.c:285
SDL_COPY_RLE_MASK
#define SDL_COPY_RLE_MASK
Definition: SDL_blit.h:44
SDL_Color::b
Uint8 b
Definition: SDL_pixels.h:299
SDL_BlitInfo::dst_skip
int dst_skip
Definition: SDL_blit.h:64
Uint32
uint32_t Uint32
Definition: SDL_stdinc.h:181
src
GLenum src
Definition: SDL_opengl_glext.h:1737
SDL_BlitInfo::dst_h
int dst_h
Definition: SDL_blit.h:62
width
GLint GLint GLsizei width
Definition: SDL_opengl.h:1572
SDL_BlitInfo::colorkey
Uint32 colorkey
Definition: SDL_blit.h:69
SDL_BlitInfo::dst
Uint8 * dst
Definition: SDL_blit.h:61
SDL_Surface::map
struct SDL_BlitMap * map
Definition: SDL_surface.h:88
SDL_memcpy
#define SDL_memcpy
Definition: SDL_dynapi_overrides.h:387
SDL_video.h
DISEMBLE_RGBA
#define DISEMBLE_RGBA(buf, bpp, fmt, Pixel, r, g, b, a)
Definition: SDL_blit.h:353
SDL_Color::r
Uint8 r
Definition: SDL_pixels.h:297
BlitBto1
static void BlitBto1(SDL_BlitInfo *info)
Definition: SDL_blit_0.c:29
SDL_BlitInfo
Definition: SDL_blit.h:55
BlitBto4Key
static void BlitBto4Key(SDL_BlitInfo *info)
Definition: SDL_blit_0.c:319
Uint8
uint8_t Uint8
Definition: SDL_stdinc.h:157
SDL_PixelFormat::BitsPerPixel
Uint8 BitsPerPixel
Definition: SDL_pixels.h:319
BlitBtoNAlpha
static void BlitBtoNAlpha(SDL_BlitInfo *info)
Definition: SDL_blit_0.c:354
BlitBtoNAlphaKey
static void BlitBtoNAlphaKey(SDL_BlitInfo *info)
Definition: SDL_blit_0.c:399
c
const GLubyte * c
Definition: SDL_opengl_glext.h:11093
SDL_BlitInfo::src
Uint8 * src
Definition: SDL_blit.h:57
SDL_BlitInfo::dst_fmt
SDL_PixelFormat * dst_fmt
Definition: SDL_blit.h:66
SDL_BlitMap::dst
SDL_Surface * dst
Definition: SDL_blit.h:88
NULL
#define NULL
Definition: begin_code.h:164
SDL_Palette::colors
SDL_Color * colors
Definition: SDL_pixels.h:307
SDL_Surface::format
SDL_PixelFormat * format
Definition: SDL_surface.h:72
height
GLint GLint GLsizei GLsizei height
Definition: SDL_opengl.h:1572
SDL_blit.h
BlitBto3
static void BlitBto3(SDL_BlitInfo *info)
Definition: SDL_blit_0.c:121
SDL_COPY_MODULATE_ALPHA
#define SDL_COPY_MODULATE_ALPHA
Definition: SDL_blit.h:35
bitmap_blit
static const SDL_BlitFunc bitmap_blit[]
Definition: SDL_blit_0.c:445
SDL_PixelFormat
Definition: SDL_pixels.h:315
SDL_BlitFunc
void(* SDL_BlitFunc)(SDL_BlitInfo *info)
Definition: SDL_blit.h:73
Uint16
uint16_t Uint16
Definition: SDL_stdinc.h:169
colorkey_blit
static const SDL_BlitFunc colorkey_blit[]
Definition: SDL_blit_0.c:449
SDL_PixelFormat::palette
SDL_Palette * palette
Definition: SDL_pixels.h:318
SDL_BlitInfo::dst_w
int dst_w
Definition: SDL_blit.h:62
map
const GLubyte GLuint GLuint GLuint GLuint alpha GLboolean GLboolean GLboolean GLboolean alpha GLint GLint GLsizei GLsizei GLenum type GLenum GLint GLenum GLint GLint GLsizei GLsizei GLint border GLenum GLint GLint GLint GLint GLint GLsizei GLsizei height GLsizei GLsizei GLenum GLenum const GLvoid *pixels GLenum GLint GLint GLint GLint j2 GLdouble GLdouble GLdouble GLdouble GLdouble GLdouble zFar GLenum GLenum GLint *params GLenum GLenum GLint *params GLenum GLenum GLint *params GLenum GLenum GLfloat *params GLenum GLint GLenum GLenum GLvoid *pixels GLenum GLint GLenum GLint *params GLenum GLenum GLint *params GLenum GLsizei const GLvoid *pointer GLenum GLenum const GLint *params GLenum GLfloat GLfloat GLint GLint const GLfloat *points GLenum GLfloat GLfloat GLint GLint GLfloat GLfloat GLint GLint const GLfloat *points GLint GLfloat GLfloat GLint GLfloat GLfloat v2 GLenum GLenum const GLint *params GLdouble GLdouble GLdouble GLdouble GLdouble GLdouble zFar GLenum map
Definition: SDL_glfuncs.h:290
SDL_COPY_BLEND
#define SDL_COPY_BLEND
Definition: SDL_blit.h:36
SDL_BlitMap::info
SDL_BlitInfo info
Definition: SDL_blit.h:92
SDL_BlitInfo::a
Uint8 a
Definition: SDL_blit.h:70