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blitbuffer.c
2978 lines (2856 loc) · 152 KB
/
blitbuffer.c
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/*
KOReader: blitbuffer implementation for jit-disabled platforms
Copyright (C) 2011 Hans-Werner Hilse <hilse@web.de>
2017 Huang Xin <chrox.huang@gmail.com>
This program is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#include <stdio.h>
#include <stdlib.h>
#include <stdbool.h>
#include <string.h>
#include "blitbuffer.h"
static const char*
get_bbtype_name(int bbtype)
{
switch (bbtype) {
case TYPE_BB4:
return "BB4";
case TYPE_BB8:
return "BB8";
case TYPE_BB8A:
return "BB8A";
case TYPE_BBRGB16:
return "BBRGB16";
case TYPE_BBRGB24:
return "BBRGB24";
case TYPE_BBRGB32:
return "BBRGB32";
default:
return "Unknown!";
}
}
#define ColorRGB32_To_Color8(color) \
(Color8){(4898U*color->r + 9618U*color->g + 1869U*color->b) >> 14U}
#define ColorRGB32_To_Color8A(color) \
(Color8A){(4898U*color->r + 9618U*color->g + 1869U*color->b) >> 14U, color->alpha}
#define ColorRGB32_To_Color16(color) \
(ColorRGB16){((color->r & 0xF8) << 8U) + ((color->g & 0xFC) << 3U) + ((color->b >> 3U))}
#define ColorRGB32_To_Color24(color) \
(ColorRGB24){color->r, color->g, color->b}
#define Color8_To_Color8A(color) \
(Color8A){color->a, 0xFF}
#define Color8A_To_Color8(color) \
(Color8){color->a}
#define Color8A_To_Color24(color) \
(ColorRGB24){color->a, color->a, color->a}
#define Color8A_To_Color16(color) \
(ColorRGB16){((color->a & 0xF8) << 8U) + ((color->a & 0xFC) << 3U) + ((color->a >> 3U))}
#define Color8A_To_Color32(color) \
(ColorRGB32){color->a, color->a, color->a, color->alpha}
#define ColorRGB16_GetR(v) (((v >> 11U) << 3U) + ((v >> 11U) >> 2U))
#define ColorRGB16_GetG(v) ((((v >> 5U) & 0x3F) << 2U) + (((v >> 5U) & 0x3F) >> 4U))
#define ColorRGB16_GetB(v) (((v & 0x001F) << 3U) + ((v & 0x001F) >> 2U))
#define ColorRGB16_To_A(v) \
((39919*ColorRGB16_GetR(v) + \
39185*ColorRGB16_GetG(v) + \
15220*ColorRGB16_GetB(v)) >> 14U)
#define RGB_To_RGB16(r, g, b) (((r & 0xF8) << 8U) + ((g & 0xFC) << 3U) + (b >> 3U))
#define RGB_To_A(r, g, b) ((4898U*r + 9618U*g + 1869U*b) >> 14U)
// Helpers to pack pixels manually, without going through the Color structs.
#define Y8_To_Y8A(v) (0xFFu << 8U | v)
#define RGB_To_RGB32(r, g, b) ((uint32_t) (0xFFu << 24U) | (uint32_t) (b << 16U) | (uint32_t) (g << 8U) | r)
#define Y8_To_RGB32(v) ((uint32_t) (0xFFu << 24U) | (uint32_t) (v << 16U) | (uint32_t) (v << 8U) | v)
// __auto_type was introduced in GCC 4.9 (and Clang ~3.8)...
// NOTE: Inspired from glibc's __GNUC_PREREQ && __glibc_clang_prereq macros (from <features.h>),
// which we of course can't use because some of our TCs use a glibc version old enough not to have the clang one...
#if (defined(__clang__) && (__clang_major__ > 3 || (__clang_major__ == 3 && __clang_minor__ >= 8))) || \
((defined(__GNUC__) && !defined(__clang__)) && (__GNUC__ > 4 || (__GNUC__ == 4 && __GNUC_MINOR__ >= 9)))
//#warning "Auto Type :)"
#define DIV_255(V) \
({ \
__auto_type _v = (V) + 128; \
(((_v >> 8U) + _v) >> 8U); \
})
// MIN/MAX with no side-effects,
// c.f., https://gcc.gnu.org/onlinedocs/cpp/Duplication-of-Side-Effects.html#Duplication-of-Side-Effects
// & https://dustri.org/b/min-and-max-macro-considered-harmful.html
#define MIN(X, Y) \
({ \
__auto_type x_ = (X); \
__auto_type y_ = (Y); \
(x_ < y_) ? x_ : y_; \
})
#define MAX(X, Y) \
({ \
__auto_type x__ = (X); \
__auto_type y__ = (Y); \
(x__ > y__) ? x__ : y__; \
})
#else
#warning "TypeOf :("
#define DIV_255(V) \
({ \
typeof (V) _v = (V) + 128; \
(((_v >> 8U) + _v) >> 8U); \
})
#define MIN(X, Y) \
({ \
typeof (X) x_ = (X); \
typeof (Y) y_ = (Y); \
(x_ < y_) ? x_ : y_; \
})
#define MAX(X, Y) \
({ \
typeof (X) x__ = (X); \
typeof (Y) y__ = (Y); \
(x__ > y__) ? x__ : y__; \
})
#endif
// Likely/Unlikely branch tagging
#define likely(x) __builtin_expect(!!(x), 1)
#define unlikely(x) __builtin_expect(!!(x), 0)
// NOTE: See Pillow's transpose operations, or Qt5 qMemRotate stuff for cache-efficient ways of rotating an image data buffer,
// instead of handling the rotation per-pixel, at plotting time.
// I have no idea if it'd be an efficient method here, since it requires an extra buffer in which to do the rotation,
// just so that new buffer can be used for the memcpy-based fast paths...
#define BB_GET_PIXEL(bb, rotation, COLOR, x, y, pptr) \
({ \
if (rotation == 0) { \
*pptr = (COLOR*)(bb->data + (y) * bb->stride) + (x); \
} else if (rotation == 1) { \
*pptr = (COLOR*)(bb->data + (x) * bb->stride) + bb->w - (y) - 1; \
} else if (rotation == 2) { \
*pptr = (COLOR*)(bb->data + (bb->h - (y) - 1) * bb->stride) + bb->w - (x) - 1; \
} else if (rotation == 3) { \
*pptr = (COLOR*)(bb->data + (bb->h - (x) - 1) * bb->stride) + (y); \
} \
})
#define SET_ALPHA_FROM_A(bb, bb_type, bb_rotation, x, y, alpha) \
({ \
if (bb_type == TYPE_BB8) { \
const Color8 * restrict srcptr; \
BB_GET_PIXEL(bb, bb_rotation, Color8, x, y, &srcptr); \
*alpha = srcptr->a; \
} else if (bb_type == TYPE_BB8A) { \
const Color8A * restrict srcptr; \
BB_GET_PIXEL(bb, bb_rotation, Color8A, x, y, &srcptr); \
*alpha = srcptr->a; \
} else if (bb_type == TYPE_BBRGB16) { \
const ColorRGB16 * restrict srcptr; \
BB_GET_PIXEL(bb, bb_rotation, ColorRGB16, x, y, &srcptr); \
*alpha = (uint8_t) ColorRGB16_To_A(srcptr->v); \
} else if (bb_type == TYPE_BBRGB24) { \
const ColorRGB24 * restrict srcptr; \
BB_GET_PIXEL(bb, bb_rotation, ColorRGB24, x, y, &srcptr); \
*alpha = (uint8_t) RGB_To_A(srcptr->r, srcptr->g, srcptr->b); \
} else if (bb_type == TYPE_BBRGB32) { \
const ColorRGB32 * restrict srcptr; \
BB_GET_PIXEL(bb, bb_rotation, ColorRGB32, x, y, &srcptr); \
*alpha = (uint8_t) RGB_To_A(srcptr->r, srcptr->g, srcptr->b); \
} \
})
static inline void BB8_SET_PIXEL_CLAMPED(BlitBuffer * restrict bb, int rotation, unsigned int x, unsigned int y, unsigned int width, unsigned int height, const Color8 * restrict color) {
if (likely(x >= 0U && x < width && y >= 0U && y < height)) {
Color8 * restrict pixel;
BB_GET_PIXEL(bb, rotation, Color8, x, y, &pixel);
*pixel = *color;
}
}
static inline void BB8A_SET_PIXEL_CLAMPED(BlitBuffer * restrict bb, int rotation, unsigned int x, unsigned int y, unsigned int width, unsigned int height, const Color8A * restrict color) {
if (likely(x >= 0U && x < width && y >= 0U && y < height)) {
Color8A * restrict pixel;
BB_GET_PIXEL(bb, rotation, Color8A, x, y, &pixel);
*pixel = *color;
}
}
static inline void BBRGB16_SET_PIXEL_CLAMPED(BlitBuffer * restrict bb, int rotation, unsigned int x, unsigned int y, unsigned int width, unsigned int height, const ColorRGB16 * restrict color) {
if (likely(x >= 0U && x < width && y >= 0U && y < height)) {
ColorRGB16 * restrict pixel;
BB_GET_PIXEL(bb, rotation, ColorRGB16, x, y, &pixel);
*pixel = *color;
}
}
static inline void BBRGB24_SET_PIXEL_CLAMPED(BlitBuffer * restrict bb, int rotation, unsigned int x, unsigned int y, unsigned int width, unsigned int height, const ColorRGB24 * restrict color) {
if (likely(x >= 0U && x < width && y >= 0U && y < height)) {
ColorRGB24 * restrict pixel;
BB_GET_PIXEL(bb, rotation, ColorRGB24, x, y, &pixel);
*pixel = *color;
}
}
static inline void BBRGB32_SET_PIXEL_CLAMPED(BlitBuffer * restrict bb, int rotation, unsigned int x, unsigned int y, unsigned int width, unsigned int height, const ColorRGB32 * restrict color) {
if (likely(x >= 0U && x < width && y >= 0U && y < height)) {
ColorRGB32 * restrict pixel;
BB_GET_PIXEL(bb, rotation, ColorRGB32, x, y, &pixel);
*pixel = *color;
}
}
static inline void BB8_BLEND_PIXEL_CLAMPED(BlitBuffer * restrict bb, int rotation, unsigned int x, unsigned int y, unsigned int width, unsigned int height, const Color8A * restrict color) {
if (likely(x >= 0U && x < width && y >= 0U && y < height)) {
Color8 * restrict pixel;
BB_GET_PIXEL(bb, rotation, Color8, x, y, &pixel);
const uint8_t alpha = color->alpha;
const uint8_t ainv = alpha ^ 0xff;
pixel->a = (uint8_t) DIV_255(alpha * color->a + ainv * pixel->a);
}
}
static inline void BB8A_BLEND_PIXEL_CLAMPED(BlitBuffer * restrict bb, int rotation, unsigned int x, unsigned int y, unsigned int width, unsigned int height, const Color8A * restrict color) {
if (likely(x >= 0U && x < width && y >= 0U && y < height)) {
Color8A * restrict pixel;
BB_GET_PIXEL(bb, rotation, Color8A, x, y, &pixel);
const uint8_t alpha = color->alpha;
const uint8_t ainv = alpha ^ 0xff;
pixel->a = (uint8_t) DIV_255(alpha * color->a + ainv * pixel->a);
pixel->alpha = 0xff;
}
}
static inline void BBRGB16_BLEND_PIXEL_CLAMPED(BlitBuffer * restrict bb, int rotation, unsigned int x, unsigned int y, unsigned int width, unsigned int height, const Color8A * restrict color) {
if (likely(x >= 0U && x < width && y >= 0U && y < height)) {
ColorRGB16 * restrict pixel;
BB_GET_PIXEL(bb, rotation, ColorRGB16, x, y, &pixel);
const uint8_t alpha = color->alpha;
const uint8_t ainv = alpha ^ 0xff;
const uint8_t r = (uint8_t) DIV_255(alpha * color->a + ainv * ColorRGB16_GetR(pixel->v));
const uint8_t g = (uint8_t) DIV_255(alpha * color->a + ainv * ColorRGB16_GetG(pixel->v));
const uint8_t b = (uint8_t) DIV_255(alpha * color->a + ainv * ColorRGB16_GetB(pixel->v));
pixel->v = (uint16_t) RGB_To_RGB16(r, g, b);
}
}
static inline void BBRGB24_BLEND_PIXEL_CLAMPED(BlitBuffer * restrict bb, int rotation, unsigned int x, unsigned int y, unsigned int width, unsigned int height, const ColorRGB32 * restrict color) {
if (likely(x >= 0U && x < width && y >= 0U && y < height)) {
ColorRGB24 * restrict pixel;
BB_GET_PIXEL(bb, rotation, ColorRGB24, x, y, &pixel);
const uint8_t alpha = color->alpha;
const uint8_t ainv = alpha ^ 0xff;
pixel->r = (uint8_t) DIV_255(alpha * color->r + ainv * pixel->r);
pixel->g = (uint8_t) DIV_255(alpha * color->g + ainv * pixel->g);
pixel->b = (uint8_t) DIV_255(alpha * color->b + ainv * pixel->b);
}
}
static inline void BBRGB32_BLEND_PIXEL_CLAMPED(BlitBuffer * restrict bb, int rotation, unsigned int x, unsigned int y, unsigned int width, unsigned int height, const ColorRGB32 * restrict color) {
if (likely(x >= 0U && x < width && y >= 0U && y < height)) {
ColorRGB32 * restrict pixel;
BB_GET_PIXEL(bb, rotation, ColorRGB32, x, y, &pixel);
const uint8_t alpha = color->alpha;
const uint8_t ainv = alpha ^ 0xff;
pixel->r = (uint8_t) DIV_255(alpha * color->r + ainv * pixel->r);
pixel->g = (uint8_t) DIV_255(alpha * color->g + ainv * pixel->g);
pixel->b = (uint8_t) DIV_255(alpha * color->b + ainv * pixel->b);
pixel->alpha = (uint8_t) 0xff;
}
}
static inline unsigned int BB_GET_WIDTH(BlitBuffer * restrict bb) {
if ((GET_BB_ROTATION(bb) & 1U) == 0U) {
return bb->w;
} else {
return bb->h;
}
}
static inline unsigned int BB_GET_HEIGHT(BlitBuffer * restrict bb) {
if ((GET_BB_ROTATION(bb) & 1U) == 0U) {
return bb->h;
} else {
return bb->w;
}
}
void BB_fill(BlitBuffer * restrict bb, uint8_t v) {
// Handle any target pitch properly
const int bb_type = GET_BB_TYPE(bb);
if (bb_type == TYPE_BB8) {
//fprintf(stdout, "%s: BB8 fill\n", __FUNCTION__);
uint8_t * restrict p = bb->data;
memset(p, v, bb->stride*bb->h);
} else if (bb_type == TYPE_BB8A) {
// We do NOT want to stomp on the alpha byte here...
const uint16_t src = (uint16_t) Y8_To_Y8A(v);
//fprintf(stdout, "%s: BB8A fill\n", __FUNCTION__);
uint16_t * restrict p = (uint16_t *) bb->data;
size_t px_count = bb->pixel_stride*bb->h;
while (px_count--) {
*p++ = src;
}
} else if (bb_type == TYPE_BBRGB16) {
// Again, RGB565 means we can't use a straight memset
const uint16_t src = (uint16_t) RGB_To_RGB16(v, v, v);
//fprintf(stdout, "%s: BBRGB16 fill\n", __FUNCTION__);
uint16_t * restrict p = (uint16_t *) bb->data;
size_t px_count = bb->pixel_stride*bb->h;
while (px_count--) {
*p++ = src;
}
} else if (bb_type == TYPE_BBRGB24) {
//fprintf(stdout, "%s: BBRGB24 fill\n", __FUNCTION__);
uint8_t * restrict p = bb->data;
memset(p, v, bb->stride*bb->h);
} else if (bb_type == TYPE_BBRGB32) {
// And here either, as we want to preserve the alpha byte
const uint32_t src = (uint32_t) Y8_To_RGB32(v);
//fprintf(stdout, "%s: BBRGB32 fill\n", __FUNCTION__);
uint32_t * restrict p = (uint32_t *) bb->data;
size_t px_count = bb->pixel_stride*bb->h;
while (px_count--) {
*p++ = src;
}
}
}
void BB_fill_rect(BlitBuffer * restrict bb, unsigned int x, unsigned int y, unsigned int w, unsigned int h, uint8_t v) {
const int rotation = GET_BB_ROTATION(bb);
unsigned int rx, ry, rw, rh;
// Compute rotated rectangle coordinates & size
switch (rotation) {
case 0:
rx = x;
ry = y;
rw = w;
rh = h;
break;
case 1:
rx = bb->w - (y + h);
ry = x;
rw = h;
rh = w;
break;
case 2:
rx = bb->w - (x + w);
ry = bb->h - (y + h);
rw = w;
rh = h;
break;
case 3:
rx = y;
ry = bb->h - (x + w);
rw = h;
rh = w;
break;
}
// Handle any target pitch properly
const int bb_type = GET_BB_TYPE(bb);
switch (bb_type) {
case TYPE_BB8:
if (rx == 0 && rw == bb->w) {
// Single step for contiguous scanlines (e.g., BB_fill())
//fprintf(stdout, "%s: Full BB8 paintRect\n", __FUNCTION__);
uint8_t * restrict p = bb->data + bb->stride*ry;
memset(p, v, bb->stride*rh);
} else {
// Scanline per scanline
//fprintf(stdout, "%s: Scanline BB8 paintRect\n", __FUNCTION__);
for (unsigned int j = ry; j < ry+rh; j++) {
uint8_t * restrict p = bb->data + bb->stride*j + rx;
memset(p, v, rw);
}
}
break;
case TYPE_BB8A:
// We do NOT want to stomp on the alpha byte here...
if (rx == 0 && rw == bb->w) {
// Single step for contiguous scanlines
const uint16_t src = (uint16_t) Y8_To_Y8A(v);
//fprintf(stdout, "%s: Full BB8A paintRect\n", __FUNCTION__);
uint16_t * restrict p = (uint16_t *) (bb->data + bb->stride*ry);
size_t px_count = bb->pixel_stride*rh;
while (px_count--) {
*p++ = src;
}
} else {
// Scanline per scanline
const uint16_t src = (uint16_t) Y8_To_Y8A(v);
//fprintf(stdout, "%s: Scanline BB8A paintRect\n", __FUNCTION__);
for (unsigned int j = ry; j < ry+rh; j++) {
uint16_t * restrict p = (uint16_t *) (bb->data + bb->stride*j) + rx;
size_t px_count = rw;
while (px_count--) {
*p++ = src;
}
}
}
break;
case TYPE_BBRGB16:
// Again, RGB565 means we can't use a straight memset
if (rx == 0 && rw == bb->w) {
// Single step for contiguous scanlines
const uint16_t src = (uint16_t) RGB_To_RGB16(v, v, v);
//fprintf(stdout, "%s: Full BBRGB16 paintRect\n", __FUNCTION__);
uint16_t * restrict p = (uint16_t *) (bb->data + bb->stride*ry);
size_t px_count = bb->pixel_stride*rh;
while (px_count--) {
*p++ = src;
}
} else {
// Scanline per scanline
const uint16_t src = (uint16_t) RGB_To_RGB16(v, v, v);
//fprintf(stdout, "%s: Sanline BBRGB16 paintRect\n", __FUNCTION__);
for (unsigned int j = ry; j < ry+rh; j++) {
uint16_t * restrict p = (uint16_t *) (bb->data + bb->stride*j) + rx;
size_t px_count = rw;
while (px_count--) {
*p++ = src;
}
}
}
break;
case TYPE_BBRGB24:
if (rx == 0 && rw == bb->w) {
// Single step for contiguous scanlines
//fprintf(stdout, "%s: Full BBRGB24 paintRect\n", __FUNCTION__);
uint8_t * restrict p = bb->data + bb->stride*ry;
memset(p, v, bb->stride*rh);
} else {
// Scanline per scanline
//fprintf(stdout, "%s: Scanline BBRGB24 paintRect\n", __FUNCTION__);
for (unsigned int j = ry; j < ry+rh; j++) {
uint8_t * restrict p = bb->data + bb->stride*j + (rx * 3U);
memset(p, v, (rw * 3U));
}
}
break;
case TYPE_BBRGB32:
// And here either, as we want to preserve the alpha byte
if (rx == 0 && rw == bb->w) {
// Single step for contiguous scanlines
const uint32_t src = (uint32_t) Y8_To_RGB32(v);
//fprintf(stdout, "%s: Full BBRGB32 paintRect\n", __FUNCTION__);
uint32_t * restrict p = (uint32_t *) (bb->data + bb->stride*ry);
size_t px_count = bb->pixel_stride*rh;
while (px_count--) {
*p++ = src;
}
} else {
// Scanline per scanline
const uint32_t src = (uint32_t) Y8_To_RGB32(v);
//fprintf(stdout, "%s: Pixel BBRGB32 paintRect\n", __FUNCTION__);
for (unsigned int j = ry; j < ry+rh; j++) {
uint32_t * restrict p = (uint32_t *) (bb->data + bb->stride*j) + rx;
size_t px_count = rw;
while (px_count--) {
*p++ = src;
}
}
}
break;
}
}
void BB_blend_rect(BlitBuffer * restrict bb, unsigned int x, unsigned int y, unsigned int w, unsigned int h, Color8A * restrict color) {
const int bb_type = GET_BB_TYPE(bb);
const int bb_rotation = GET_BB_ROTATION(bb);
const uint8_t alpha = color->alpha;
const uint8_t ainv = alpha ^ 0xFF;
switch (bb_type) {
case TYPE_BB8:
for (unsigned int j = y; j < y + h; j++) {
for (unsigned int i = x; i < x + w; i++) {
Color8 * restrict dstptr;
BB_GET_PIXEL(bb, bb_rotation, Color8, i, j, &dstptr);
dstptr->a = (uint8_t) DIV_255(dstptr->a * ainv + color->a * alpha);
}
}
break;
case TYPE_BB8A:
for (unsigned int j = y; j < y + h; j++) {
for (unsigned int i = x; i < x + w; i++) {
Color8A * restrict dstptr;
BB_GET_PIXEL(bb, bb_rotation, Color8A, i, j, &dstptr);
dstptr->a = (uint8_t) DIV_255(dstptr->a * ainv + color->a * alpha);
}
}
break;
case TYPE_BBRGB16:
for (unsigned int j = y; j < y + h; j++) {
for (unsigned int i = x; i < x + w; i++) {
ColorRGB16 * restrict dstptr;
BB_GET_PIXEL(bb, bb_rotation, ColorRGB16, i, j, &dstptr);
const uint8_t r = (uint8_t) DIV_255(ColorRGB16_GetR(dstptr->v) * ainv + color->a * alpha);
const uint8_t g = (uint8_t) DIV_255(ColorRGB16_GetG(dstptr->v) * ainv + color->a * alpha);
const uint8_t b = (uint8_t) DIV_255(ColorRGB16_GetB(dstptr->v) * ainv + color->a * alpha);
dstptr->v = (uint16_t) RGB_To_RGB16(r, g, b);
}
}
break;
case TYPE_BBRGB24:
for (unsigned int j = y; j < y + h; j++) {
for (unsigned int i = x; i < x + w; i++) {
ColorRGB24 * restrict dstptr;
BB_GET_PIXEL(bb, bb_rotation, ColorRGB24, i, j, &dstptr);
dstptr->r = (uint8_t) DIV_255(dstptr->r * ainv + color->a * alpha);
dstptr->g = (uint8_t) DIV_255(dstptr->g * ainv + color->a * alpha);
dstptr->b = (uint8_t) DIV_255(dstptr->b * ainv + color->a * alpha);
}
}
break;
case TYPE_BBRGB32:
for (unsigned int j = y; j < y + h; j++) {
for (unsigned int i = x; i < x + w; i++) {
ColorRGB32 * restrict dstptr;
BB_GET_PIXEL(bb, bb_rotation, ColorRGB32, i, j, &dstptr);
dstptr->r = (uint8_t) DIV_255(dstptr->r * ainv + color->a * alpha);
dstptr->g = (uint8_t) DIV_255(dstptr->g * ainv + color->a * alpha);
dstptr->b = (uint8_t) DIV_255(dstptr->b * ainv + color->a * alpha);
}
}
break;
}
}
void BB_invert_rect(BlitBuffer * restrict bb, unsigned int x, unsigned int y, unsigned int w, unsigned int h) {
const int rotation = GET_BB_ROTATION(bb);
unsigned int rx, ry, rw, rh;
// Compute rotated rectangle coordinates & size
switch (rotation) {
case 0:
rx = x;
ry = y;
rw = w;
rh = h;
break;
case 1:
rx = bb->w - (y + h);
ry = x;
rw = h;
rh = w;
break;
case 2:
rx = bb->w - (x + w);
ry = bb->h - (y + h);
rw = w;
rh = h;
break;
case 3:
rx = y;
ry = bb->h - (x + w);
rw = h;
rh = w;
break;
}
// Handle any target pitch properly
const int bb_type = GET_BB_TYPE(bb);
switch (bb_type) {
case TYPE_BB8:
if (rx == 0 && rw == bb->w) {
// Single step for contiguous scanlines
//fprintf(stdout, "%s: Full BB8 invertRect\n", __FUNCTION__);
uint8_t * restrict p = bb->data + bb->stride*ry;
size_t px_count = bb->pixel_stride*rh;
while (px_count--) {
*p++ ^= 0xFF;
}
} else {
// Scanline per scanline
//fprintf(stdout, "%s: Scanline BB8 invertRect\n", __FUNCTION__);
for (unsigned int j = ry; j < ry+rh; j++) {
uint8_t * restrict p = bb->data + bb->stride*j + rx;
size_t px_count = rw;
while (px_count--) {
*p++ ^= 0xFF;
}
}
}
break;
case TYPE_BB8A:
if (rx == 0 && rw == bb->w) {
// Single step for contiguous scanlines
//fprintf(stdout, "%s: Full BB8A invertRect\n", __FUNCTION__);
uint16_t * restrict p = (uint16_t*) (bb->data + bb->stride*ry);
size_t px_count = bb->pixel_stride*rh;
while (px_count--) {
*p++ ^= 0x00FF;
}
} else {
// Scanline per scanline
//fprintf(stdout, "%s: Scanline BB8A invertRect\n", __FUNCTION__);
for (unsigned int j = ry; j < ry+rh; j++) {
uint16_t * restrict p = (uint16_t*) (bb->data + bb->stride*j) + rx;
size_t px_count = rw;
while (px_count--) {
*p++ ^= 0x00FF;
}
}
}
break;
case TYPE_BBRGB16:
// NOTE: Not actually accurate, but RGB565 is the worst.
if (rx == 0 && rw == bb->w) {
// Single step for contiguous scanlines
//fprintf(stdout, "%s: Full BBRGB16 invertRect\n", __FUNCTION__);
uint16_t * restrict p = (uint16_t*) (bb->data + bb->stride*ry);
size_t px_count = bb->pixel_stride*rh;
while (px_count--) {
*p++ ^= 0xFFFF;
}
} else {
// Scanline per scanline
//fprintf(stdout, "%s: Scanline BBRGB16 invertRect\n", __FUNCTION__);
for (unsigned int j = ry; j < ry+rh; j++) {
uint16_t * restrict p = (uint16_t*) (bb->data + bb->stride*j) + rx;
size_t px_count = rw;
while (px_count--) {
*p++ ^= 0xFFFF;
}
}
}
break;
case TYPE_BBRGB24:
if (rx == 0 && rw == bb->w) {
// Single step for contiguous scanlines
//fprintf(stdout, "%s: Full BBRGB24 invertRect\n", __FUNCTION__);
uint8_t * restrict p = bb->data + bb->stride*ry;
size_t px_count = bb->pixel_stride*rh;
while (px_count--) {
*p++ ^= 0xFF;
*p++ ^= 0xFF;
*p++ ^= 0xFF;
}
} else {
// Scanline per scanline
//fprintf(stdout, "%s: Scanline BBRGB24 invertRect\n", __FUNCTION__);
for (unsigned int j = ry; j < ry+rh; j++) {
uint8_t * restrict p = bb->data + bb->stride*j + (rx * 3U);
size_t px_count = rw;
while (px_count--) {
*p++ ^= 0xFF;
*p++ ^= 0xFF;
*p++ ^= 0xFF;
}
}
}
break;
case TYPE_BBRGB32:
if (rx == 0 && rw == bb->w) {
// Single step for contiguous scanlines
//fprintf(stdout, "%s: Full BBRGB32 invertRect\n", __FUNCTION__);
uint32_t * restrict p = (uint32_t*) (bb->data + bb->stride*ry);
size_t px_count = bb->pixel_stride*rh;
while (px_count--) {
*p++ ^= 0x00FFFFFF;
}
} else {
// Scanline per scanline
//fprintf(stdout, "%s: Scanline BBRGB32 invertRect\n", __FUNCTION__);
for (unsigned int j = ry; j < ry+rh; j++) {
uint32_t * restrict p = (uint32_t*) (bb->data + bb->stride*j) + rx;
size_t px_count = rw;
while (px_count--) {
*p++ ^= 0x00FFFFFF;
}
}
}
break;
}
}
void BB_hatch_rect(BlitBuffer * restrict bb, unsigned int x, unsigned int y, unsigned int w, unsigned int h, unsigned int stripe_width, Color8 * restrict color, uint8_t alpha) {
if (alpha == 0) { // NOP
return;
}
const uint8_t ainv = alpha ^ 0xFF;
const int bb_type = GET_BB_TYPE(bb);
const int rotation = GET_BB_ROTATION(bb);
const int sw2 = stripe_width * 2;
switch (bb_type) {
case TYPE_BB8:
if (alpha == 0xFF) {
for (unsigned int d_y = 0; d_y < h; d_y++) {
for (unsigned int d_x = 0; d_x < w; d_x++) {
if ((d_x + d_y) % sw2 < stripe_width) {
Color8 * restrict dstptr;
BB_GET_PIXEL(bb, rotation, Color8, x+d_x, y+d_y, &dstptr);
*dstptr = *color;
}
}
}
} else {
for (unsigned int d_y = 0; d_y < h; d_y++) {
for (unsigned int d_x = 0; d_x < w; d_x++) {
if ((d_x + d_y) % sw2 < stripe_width) {
Color8 * restrict dstptr;
BB_GET_PIXEL(bb, rotation, Color8, x+d_x, y+d_y, &dstptr);
dstptr->a = (uint8_t) DIV_255(dstptr->a * ainv + color->a * alpha);
}
}
}
}
break;
case TYPE_BB8A:
if (alpha == 0xFF) {
for (unsigned int d_y = 0; d_y < h; d_y++) {
for (unsigned int d_x = 0; d_x < w; d_x++) {
if ((d_x + d_y) % sw2 < stripe_width) {
Color8A * restrict dstptr;
BB_GET_PIXEL(bb, rotation, Color8A, x+d_x, y+d_y, &dstptr);
dstptr->a = color->a;
}
}
}
} else {
for (unsigned int d_y = 0; d_y < h; d_y++) {
for (unsigned int d_x = 0; d_x < w; d_x++) {
if ((d_x + d_y) % sw2 < stripe_width) {
Color8A * restrict dstptr;
BB_GET_PIXEL(bb, rotation, Color8A, x+d_x, y+d_y, &dstptr);
dstptr->a = (uint8_t) DIV_255(dstptr->a * ainv + color->a * alpha);
}
}
}
}
break;
case TYPE_BBRGB16:
if (alpha == 0xFF) {
for (unsigned int d_y = 0; d_y < h; d_y++) {
for (unsigned int d_x = 0; d_x < w; d_x++) {
if ((d_x + d_y) % sw2 < stripe_width) {
ColorRGB16 * restrict dstptr;
BB_GET_PIXEL(bb, rotation, ColorRGB16, x + d_x, y + d_y, &dstptr);
dstptr->v = (uint16_t) RGB_To_RGB16(color->a, color->a, color->a);
}
}
}
} else {
for (unsigned int d_y = 0; d_y < h; d_y++) {
for (unsigned int d_x = 0; d_x < w; d_x++) {
if ((d_x + d_y) % sw2 < stripe_width) {
ColorRGB16 * restrict dstptr;
BB_GET_PIXEL(bb, rotation, ColorRGB16, x + d_x, y + d_y, &dstptr);
const uint8_t r = (uint8_t) DIV_255(ColorRGB16_GetR(dstptr->v) * ainv + color->a * alpha);
const uint8_t g = (uint8_t) DIV_255(ColorRGB16_GetG(dstptr->v) * ainv + color->a * alpha);
const uint8_t b = (uint8_t) DIV_255(ColorRGB16_GetB(dstptr->v) * ainv + color->a * alpha);
dstptr->v = (uint16_t) RGB_To_RGB16(r, g, b);
}
}
}
}
break;
case TYPE_BBRGB24:
if (alpha == 0xFF) {
for (unsigned int d_y = 0; d_y < h; d_y++) {
for (unsigned int d_x = 0; d_x < w; d_x++) {
if ((d_x + d_y) % sw2 < stripe_width) {
ColorRGB24 * restrict dstptr;
BB_GET_PIXEL(bb, rotation, ColorRGB24, x + d_x, y + d_y, &dstptr);
dstptr->r = color->a;
dstptr->g = color->a;
dstptr->b = color->a;
}
}
}
} else {
for (unsigned int d_y = 0; d_y < h; d_y++) {
for (unsigned int d_x = 0; d_x < w; d_x++) {
if ((d_x + d_y) % sw2 < stripe_width) {
ColorRGB24 * restrict dstptr;
BB_GET_PIXEL(bb, rotation, ColorRGB24, x + d_x, y + d_y, &dstptr);
dstptr->r = (uint8_t) DIV_255(dstptr->r * ainv + color->a * alpha);
dstptr->g = (uint8_t) DIV_255(dstptr->g * ainv + color->a * alpha);
dstptr->b = (uint8_t) DIV_255(dstptr->b * ainv + color->a * alpha);
}
}
}
}
break;
case TYPE_BBRGB32:
if (alpha == 0xFF) {
for (unsigned int d_y = 0; d_y < h; d_y++) {
for (unsigned int d_x = 0; d_x < w; d_x++) {
if ((d_x + d_y) % sw2 < stripe_width) {
ColorRGB32 * restrict dstptr;
BB_GET_PIXEL(bb, rotation, ColorRGB32, x + d_x, y + d_y, &dstptr);
dstptr->r = (uint8_t) color->a;
dstptr->g = (uint8_t) color->a;
dstptr->b = (uint8_t) color->a;
// dstptr->alpha = 0xFF;
}
}
}
} else {
for (unsigned int d_y = 0; d_y < h; d_y++) {
for (unsigned int d_x = 0; d_x < w; d_x++) {
if ((d_x + d_y) % sw2 < stripe_width) {
ColorRGB32 * restrict dstptr;
BB_GET_PIXEL(bb, rotation, ColorRGB32, x + d_x, y + d_y, &dstptr);
dstptr->r = (uint8_t) DIV_255(dstptr->r * ainv + color->a * alpha);
dstptr->g = (uint8_t) DIV_255(dstptr->g * ainv + color->a * alpha);
dstptr->b = (uint8_t) DIV_255(dstptr->b * ainv + color->a * alpha);
// dstptr->alpha = 0xFF;
}
}
}
}
break;
}
}
void BB_blit_to_BB8(const BlitBuffer * restrict src, BlitBuffer * restrict dst,
unsigned int dest_x, unsigned int dest_y, unsigned int offs_x, unsigned int offs_y, unsigned int w, unsigned int h) {
const int sbb_type = GET_BB_TYPE(src);
const int sbb_rotation = GET_BB_ROTATION(src);
const int dbb_rotation = GET_BB_ROTATION(dst);
switch (sbb_type) {
case TYPE_BB8:
// We can only do a fast copy for simple same-to-same blitting without any extra processing.
// (i.e., setPixel, no rota, no invert).
// The cbb codepath ensures setPixel & no invert, so we only check for rotation.
if (sbb_rotation == 0 && dbb_rotation == 0) {
if (offs_x == 0 && dest_x == 0 && w == src->w && w == dst->w && src->stride == dst->stride) {
// Single step for contiguous scanlines (on both sides)
//fprintf(stdout, "%s: full copy blit from BB8 to BB8\n", __FUNCTION__);
// BB8 is 1 byte per pixel
const uint8_t * restrict srcp = src->data + src->stride*offs_y;
uint8_t * restrict dstp = dst->data + dst->stride*dest_y;
memcpy(dstp, srcp, w*h);
} else {
// Scanline per scanline copy
//fprintf(stdout, "%s: scanline copy blit from BB8 to BB8\n", __FUNCTION__);
for (unsigned int d_y = dest_y, o_y = offs_y; d_y < dest_y+h; d_y++, o_y++) {
// BB8 is 1 byte per pixel
const uint8_t * restrict srcp = src->data + src->stride*o_y + offs_x;
uint8_t * restrict dstp = dst->data + dst->stride*d_y + dest_x;
memcpy(dstp, srcp, w);
}
}
} else {
for (unsigned int d_y = dest_y, o_y = offs_y; d_y < dest_y + h; d_y++, o_y++) {
for (unsigned int d_x = dest_x, o_x = offs_x; d_x < dest_x + w; d_x++, o_x++) {
Color8 * restrict dstptr;
BB_GET_PIXEL(dst, dbb_rotation, Color8, d_x, d_y, &dstptr);
const Color8 * restrict srcptr;
BB_GET_PIXEL(src, sbb_rotation, Color8, o_x, o_y, &srcptr);
*dstptr = *srcptr;
}
}
}
break;
case TYPE_BB8A:
for (unsigned int d_y = dest_y, o_y = offs_y; d_y < dest_y + h; d_y++, o_y++) {
for (unsigned int d_x = dest_x, o_x = offs_x; d_x < dest_x + w; d_x++, o_x++) {
Color8 * restrict dstptr;
BB_GET_PIXEL(dst, dbb_rotation, Color8, d_x, d_y, &dstptr);
const Color8A * restrict srcptr;
BB_GET_PIXEL(src, sbb_rotation, Color8A, o_x, o_y, &srcptr);
dstptr->a = srcptr->a;
}
}
break;
case TYPE_BBRGB16:
for (unsigned int d_y = dest_y, o_y = offs_y; d_y < dest_y + h; d_y++, o_y++) {
for (unsigned int d_x = dest_x, o_x = offs_x; d_x < dest_x + w; d_x++, o_x++) {
Color8 * restrict dstptr;
BB_GET_PIXEL(dst, dbb_rotation, Color8, d_x, d_y, &dstptr);
const ColorRGB16 * restrict srcptr;
BB_GET_PIXEL(src, sbb_rotation, ColorRGB16, o_x, o_y, &srcptr);
dstptr->a = (uint8_t) ColorRGB16_To_A(srcptr->v);
}
}
break;
case TYPE_BBRGB24:
for (unsigned int d_y = dest_y, o_y = offs_y; d_y < dest_y + h; d_y++, o_y++) {
for (unsigned int d_x = dest_x, o_x = offs_x; d_x < dest_x + w; d_x++, o_x++) {
Color8 * restrict dstptr;
BB_GET_PIXEL(dst, dbb_rotation, Color8, d_x, d_y, &dstptr);
const ColorRGB24 * restrict srcptr;
BB_GET_PIXEL(src, sbb_rotation, ColorRGB24, o_x, o_y, &srcptr);
dstptr->a = (uint8_t) RGB_To_A(srcptr->r, srcptr->g, srcptr->b);
}
}
break;
case TYPE_BBRGB32:
for (unsigned int d_y = dest_y, o_y = offs_y; d_y < dest_y + h; d_y++, o_y++) {
for (unsigned int d_x = dest_x, o_x = offs_x; d_x < dest_x + w; d_x++, o_x++) {
Color8 * restrict dstptr;
BB_GET_PIXEL(dst, dbb_rotation, Color8, d_x, d_y, &dstptr);
const ColorRGB32 * restrict srcptr;
BB_GET_PIXEL(src, sbb_rotation, ColorRGB32, o_x, o_y, &srcptr);
dstptr->a = (uint8_t) RGB_To_A(srcptr->r, srcptr->g, srcptr->b);
}
}
break;
}
}
// Quantize an 8-bit color value down to a palette of 16 evenly spaced colors, using an ordered 8x8 dithering pattern.
// With a grayscale input, this happens to match the eInk palette perfectly ;).
// If the input is not grayscale, and the output fb is not grayscale either,
// this usually still happens to match the eInk palette after the EPDC's own quantization pass.
// c.f., https://en.wikipedia.org/wiki/Ordered_dithering
// & https://github.com/ImageMagick/ImageMagick/blob/ecfeac404e75f304004f0566557848c53030bad6/MagickCore/threshold.c#L1627
// NOTE: As the references imply, this is straight from ImageMagick,
// with only minor simplifications to enforce Q8 & avoid fp maths.
static uint8_t
dither_o8x8(unsigned int x, unsigned int y, uint8_t v)
{
// c.f., https://github.com/ImageMagick/ImageMagick/blob/ecfeac404e75f304004f0566557848c53030bad6/config/thresholds.xml#L107
static const uint8_t threshold_map_o8x8[] = { 1, 49, 13, 61, 4, 52, 16, 64, 33, 17, 45, 29, 36, 20, 48, 32,
9, 57, 5, 53, 12, 60, 8, 56, 41, 25, 37, 21, 44, 28, 40, 24,
3, 51, 15, 63, 2, 50, 14, 62, 35, 19, 47, 31, 34, 18, 46, 30,
11, 59, 7, 55, 10, 58, 6, 54, 43, 27, 39, 23, 42, 26, 38, 22 };
// Constants:
// Quantum = 8; Levels = 16; map Divisor = 65
// QuantumRange = 0xFF
// QuantumScale = 1.0 / QuantumRange
//
// threshold = QuantumScale * v * ((L-1) * (D-1) + 1)
// NOTE: The initial computation of t (specifically, what we pass to DIV255) would overflow an uint8_t.
// With a Q8 input value, we're at no risk of ever underflowing, so, keep to unsigned maths.
// Technically, an uint16_t would be wide enough, but it gains us nothing,
// and requires a few explicit casts to make GCC happy ;).
uint32_t t = DIV_255(v * ((15U << 6U) + 1U));
// level = t / (D-1);
const uint32_t l = (t >> 6U);
// t -= l * (D-1);
t = (t - (l << 6U));
// map width & height = 8
// c = ClampToQuantum((l+(t >= map[(x % mw) + mw * (y % mh)])) * QuantumRange / (L-1));
const uint32_t q = ((l + (t >= threshold_map_o8x8[(x & 7U) + 8U * (y & 7U)])) * 17U);
// NOTE: We're doing unsigned maths, so, clamping is basically MIN(q, UINT8_MAX) ;).
// The only overflow we should ever catch should be for a few white (v = 0xFF) input pixels
// that get shifted to the next step (i.e., q = 272 (0xFF + 17)).
return (q > UINT8_MAX ? UINT8_MAX : (uint8_t) q);
}
void BB_dither_blit_to_BB8(const BlitBuffer * restrict src, BlitBuffer * restrict dst,
unsigned int dest_x, unsigned int dest_y, unsigned int offs_x, unsigned int offs_y, unsigned int w, unsigned int h) {
const int sbb_type = GET_BB_TYPE(src);
const int sbb_rotation = GET_BB_ROTATION(src);
const int dbb_rotation = GET_BB_ROTATION(dst);
switch (sbb_type) {
case TYPE_BB8:
for (unsigned int d_y = dest_y, o_y = offs_y; d_y < dest_y + h; d_y++, o_y++) {
for (unsigned int d_x = dest_x, o_x = offs_x; d_x < dest_x + w; d_x++, o_x++) {
Color8 * restrict dstptr;
BB_GET_PIXEL(dst, dbb_rotation, Color8, d_x, d_y, &dstptr);
const Color8 * restrict srcptr;
BB_GET_PIXEL(src, sbb_rotation, Color8, o_x, o_y, &srcptr);
dstptr->a = dither_o8x8(o_x, o_y, srcptr->a);
}
}
break;
case TYPE_BB8A:
for (unsigned int d_y = dest_y, o_y = offs_y; d_y < dest_y + h; d_y++, o_y++) {
for (unsigned int d_x = dest_x, o_x = offs_x; d_x < dest_x + w; d_x++, o_x++) {
Color8 * restrict dstptr;
BB_GET_PIXEL(dst, dbb_rotation, Color8, d_x, d_y, &dstptr);
const Color8A * restrict srcptr;
BB_GET_PIXEL(src, sbb_rotation, Color8A, o_x, o_y, &srcptr);
dstptr->a = dither_o8x8(o_x, o_y, srcptr->a);
}
}
break;
case TYPE_BBRGB16:
for (unsigned int d_y = dest_y, o_y = offs_y; d_y < dest_y + h; d_y++, o_y++) {
for (unsigned int d_x = dest_x, o_x = offs_x; d_x < dest_x + w; d_x++, o_x++) {
Color8 * restrict dstptr;
BB_GET_PIXEL(dst, dbb_rotation, Color8, d_x, d_y, &dstptr);
const ColorRGB16 * restrict srcptr;
BB_GET_PIXEL(src, sbb_rotation, ColorRGB16, o_x, o_y, &srcptr);
dstptr->a = dither_o8x8(o_x, o_y, (uint8_t) ColorRGB16_To_A(srcptr->v));
}
}