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rockbox/firmware/drivers/lcd-16bit-common.c
Aidan MacDonald 593103cd8b lcd: Fix 4bpp optimized 16-bit alpha blit 
Fixes a bug introduced by commit 5d0c382a59 that caused graphical
corruption on anti-aliased fonts.

Change-Id: I6052ca758382bd9a1154d2e2208dee633dd17715
2023-01-08 10:50:39 +00:00

656 lines
19 KiB
C
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/***************************************************************************
* __________ __ ___.
* Open \______ \ ____ ____ | | _\_ |__ _______ ___
* Source | _// _ \_/ ___\| |/ /| __ \ / _ \ \/ /
* Jukebox | | ( <_> ) \___| < | \_\ ( <_> > < <
* Firmware |____|_ /\____/ \___ >__|_ \|___ /\____/__/\_ \
* \/ \/ \/ \/ \/
* $Id$
*
* Copyright (C) 2005 by Dave Chapman
*
* Rockbox driver for 16-bit colour LCDs
*
* 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 2
* of the License, or (at your option) any later version.
*
* This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
* KIND, either express or implied.
*
****************************************************************************/
/* to be #included by lcd-16bit*.c */
#if !defined(ROW_INC) || !defined(COL_INC)
#error ROW_INC or COL_INC not defined
#endif
/* Clear the current viewport */
void lcd_clear_viewport(void)
{
struct viewport *vp = lcd_current_viewport;
fb_data *dst, *dst_end;
int x, y, width, height;
int len, step;
x = vp->x;
y = vp->y;
width = vp->width;
height = vp->height;
len = STRIDE_MAIN(width, height);
step = STRIDE_MAIN(ROW_INC, COL_INC);
dst = FBADDR(x, y);
dst_end = FBADDR(x + width - 1 , y + height - 1);
if (vp->drawmode & DRMODE_INVERSEVID)
{
do
{
memset16(dst, vp->fg_pattern, len);
dst += step;
}
while (dst <= dst_end);
}
else
{
if (lcd_backdrop && vp->buffer == &lcd_framebuffer_default)
{
do
{
memcpy(dst, PTR_ADD(dst, lcd_backdrop_offset),
len * sizeof(fb_data));
dst += step;
}
while (dst <= dst_end);
}
else
{
do
{
memset16(dst, vp->bg_pattern, len);
dst += step;
}
while (dst <= dst_end);
}
}
if (vp == &default_vp)
lcd_scroll_stop();
else
lcd_scroll_stop_viewport(vp);
vp->flags &= ~(VP_FLAG_VP_SET_CLEAN);
}
/*** low-level drawing functions ***/
static void ICODE_ATTR setpixel(fb_data *address)
{
*address = lcd_current_viewport->fg_pattern;
}
static void ICODE_ATTR clearpixel(fb_data *address)
{
*address = lcd_current_viewport->bg_pattern;
}
static void ICODE_ATTR clearimgpixel(fb_data *address)
{
*address = *PTR_ADD(address, lcd_backdrop_offset);
}
static void ICODE_ATTR flippixel(fb_data *address)
{
*address = ~(*address);
}
static void ICODE_ATTR nopixel(fb_data *address)
{
(void)address;
}
lcd_fastpixelfunc_type* const lcd_fastpixelfuncs_bgcolor[8] = {
flippixel, nopixel, setpixel, setpixel,
nopixel, clearpixel, nopixel, clearpixel
};
lcd_fastpixelfunc_type* const lcd_fastpixelfuncs_backdrop[8] = {
flippixel, nopixel, setpixel, setpixel,
nopixel, clearimgpixel, nopixel, clearimgpixel
};
lcd_fastpixelfunc_type* const * lcd_fastpixelfuncs = lcd_fastpixelfuncs_bgcolor;
/* Fill a rectangular area */
void lcd_fillrect(int x, int y, int width, int height)
{
struct viewport *vp = lcd_current_viewport;
unsigned bits = 0;
enum fill_opt fillopt = OPT_NONE;
fb_data *dst, *dst_end;
int len, step;
if (!clip_viewport_rect(vp, &x, &y, &width, &height, NULL, NULL))
return;
/* drawmode and optimisation */
if (vp->drawmode & DRMODE_INVERSEVID)
{
if (vp->drawmode & DRMODE_BG)
{
if (!lcd_backdrop)
{
fillopt = OPT_SET;
bits = vp->bg_pattern;
}
else
fillopt = OPT_COPY;
}
}
else
{
if (vp->drawmode & DRMODE_FG)
{
fillopt = OPT_SET;
bits = vp->fg_pattern;
}
}
if (fillopt == OPT_NONE && vp->drawmode != DRMODE_COMPLEMENT)
return;
dst = FBADDR(x, y);
dst_end = FBADDR(x + width - 1, y + height - 1);
len = STRIDE_MAIN(width, height);
step = STRIDE_MAIN(ROW_INC, COL_INC);
do
{
switch (fillopt)
{
case OPT_SET:
memset16(dst, bits, len);
break;
case OPT_COPY:
memcpy(dst, PTR_ADD(dst, lcd_backdrop_offset),
len * sizeof(fb_data));
break;
case OPT_NONE: /* DRMODE_COMPLEMENT */
{
fb_data *start = dst;
fb_data *end = start + len;
do
*start = ~(*start);
while (++start < end);
break;
}
}
dst += step;
}
while (dst <= dst_end);
}
/* About Rockbox' internal monochrome bitmap format:
*
* A bitmap contains one bit for every pixel that defines if that pixel is
* black (1) or white (0). Bits within a byte are arranged vertically, LSB
* at top.
* The bytes are stored in row-major order, with byte 0 being top left,
* byte 1 2nd from left etc. The first row of bytes defines pixel rows
* 0..7, the second row defines pixel row 8..15 etc.
*
* This is the mono bitmap format used on all other targets so far; the
* pixel packing doesn't really matter on a 8bit+ target. */
/* Draw a partial monochrome bitmap */
void ICODE_ATTR lcd_mono_bitmap_part(const unsigned char *src, int src_x,
int src_y, int stride, int x, int y,
int width, int height)
{
struct viewport *vp = lcd_current_viewport;
if (!clip_viewport_rect(vp, &x, &y, &width, &height, &src_x, &src_y))
return;
/* move starting point */
src += stride * (src_y >> 3) + src_x;
src_y &= 7;
unsigned dmask = 0;
int drmode = vp->drawmode;
if (drmode & DRMODE_INVERSEVID)
{
dmask = 0xff;
drmode &= DRMODE_SOLID; /* mask out inversevid */
}
/* Use extra bit to avoid if () in the switch-cases below */
if ((drmode & DRMODE_BG) && lcd_backdrop)
drmode |= DRMODE_INT_BD;
fb_data* dst = FBADDR(x, y);
while(height > 0)
{
const unsigned char* src_col = src;
const unsigned char* src_end = src + width;
fb_data* dst_col = dst;
unsigned data;
int fg, bg;
uintptr_t bo;
switch (drmode) {
case DRMODE_COMPLEMENT:
do {
data = (*src_col++ ^ dmask) >> src_y;
if(data & 0x01)
*dst_col = ~(*dst_col);
dst_col += COL_INC;
} while(src_col != src_end);
break;
case DRMODE_BG|DRMODE_INT_BD:
bo = lcd_backdrop_offset;
do {
data = (*src_col++ ^ dmask) >> src_y;
if(!(data & 0x01))
*dst_col = *PTR_ADD(dst_col, bo);
dst_col += COL_INC;
} while(src_col != src_end);
break;
case DRMODE_BG:
bg = vp->bg_pattern;
do {
data = (*src_col++ ^ dmask) >> src_y;
if(!(data & 0x01))
*dst_col = bg;
dst_col += COL_INC;
} while(src_col != src_end);
break;
case DRMODE_FG:
fg = vp->fg_pattern;
do {
data = (*src_col++ ^ dmask) >> src_y;
if(data & 0x01)
*dst_col = fg;
dst_col += COL_INC;
} while(src_col != src_end);
break;
case DRMODE_SOLID|DRMODE_INT_BD:
fg = vp->fg_pattern;
bo = lcd_backdrop_offset;
do {
data = (*src_col++ ^ dmask) >> src_y;
if(data & 0x01)
*dst_col = fg;
else
*dst_col = *PTR_ADD(dst_col, bo);
dst_col += COL_INC;
} while(src_col != src_end);
break;
case DRMODE_SOLID:
fg = vp->fg_pattern;
bg = vp->bg_pattern;
do {
data = (*src_col++ ^ dmask) >> src_y;
if(data & 0x01)
*dst_col = fg;
else
*dst_col = bg;
dst_col += COL_INC;
} while(src_col != src_end);
break;
}
src_y = (src_y + 1) & 7;
if(src_y == 0)
src += stride;
dst += ROW_INC;
height--;
}
}
/* Draw a full monochrome bitmap */
void lcd_mono_bitmap(const unsigned char *src, int x, int y, int width, int height)
{
lcd_mono_bitmap_part(src, 0, 0, width, x, y, width, height);
}
/* About Rockbox' internal alpha channel format (for ALPHA_BPP == 4)
*
* For each pixel, 4bit of alpha information is stored in a byte-stream,
* so two pixels are packed into one byte.
* The lower nibble is the first pixel, the upper one the second. The stride is
* horizontal. E.g row0: pixel0: byte0[0:3], pixel1: byte0[4:7], pixel2: byte1[0:3],...
* The format is independant of the internal display orientation and color
* representation, as to support the same font files on all displays.
* The values go linear from 0 (fully opaque) to 15 (fully transparent)
* (note how this is the opposite of the alpha channel in the ARGB format).
*
* This might suggest that rows need to have an even number of pixels.
* However this is generally not the case. lcd_alpha_bitmap_part_mix() can deal
* with uneven colums (i.e. two rows can share one byte). And font files do
* exploit this.
* However, this is difficult to do for image files, especially bottom-up bitmaps,
* so lcd_bmp() do expect even rows.
*/
#define ALPHA_BPP 4
#define ALPHA_MASK ((1 << ALPHA_BPP) - 1)
#define ALPHA_PIXELS_PER_BYTE (CHAR_BIT / ALPHA_BPP)
#define ALPHA_WORD_T uint32_t
#define ALPHA_WORD_LOAD load_le32
#define ALPHA_WORDSIZE sizeof(ALPHA_WORD_T)
#define ALPHA_PIXELS_PER_WORD (ALPHA_WORDSIZE * CHAR_BIT / ALPHA_BPP)
#ifdef CPU_ARM
#define BLEND_INIT do {} while (0)
#define BLEND_FINISH do {} while(0)
#define BLEND_START(acc, color, alpha) \
asm volatile("mul %0, %1, %2" : "=&r" (acc) : "r" (color), "r" (alpha))
#define BLEND_CONT(acc, color, alpha) \
asm volatile("mla %0, %1, %2, %0" : "+&r" (acc) : "r" (color), "r" (alpha))
#define BLEND_OUT(acc) do {} while (0)
#elif defined(CPU_COLDFIRE)
#define ALPHA_BITMAP_READ_WORDS
#define BLEND_INIT \
unsigned long _macsr = coldfire_get_macsr(); \
coldfire_set_macsr(EMAC_UNSIGNED)
#define BLEND_FINISH \
coldfire_set_macsr(_macsr)
#define BLEND_START(acc, color, alpha) \
asm volatile("mac.l %0, %1, %%acc0" :: "%d" (color), "d" (alpha))
#define BLEND_CONT BLEND_START
#define BLEND_OUT(acc) asm volatile("movclr.l %%acc0, %0" : "=d" (acc))
#else
#define BLEND_INIT do {} while (0)
#define BLEND_FINISH do {} while(0)
#define BLEND_START(acc, color, alpha) ((acc) = (color) * (alpha))
#define BLEND_CONT(acc, color, alpha) ((acc) += (color) * (alpha))
#define BLEND_OUT(acc) do {} while (0)
#endif
/* Blend the given two colors */
static inline unsigned blend_two_colors(unsigned c1, unsigned c2, unsigned a)
{
a += a >> (ALPHA_BPP - 1);
#if (LCD_PIXELFORMAT == RGB565SWAPPED)
c1 = swap16(c1);
c2 = swap16(c2);
#endif
unsigned c1l = (c1 | (c1 << 16)) & 0x07e0f81f;
unsigned c2l = (c2 | (c2 << 16)) & 0x07e0f81f;
unsigned p;
BLEND_START(p, c1l, a);
BLEND_CONT(p, c2l, ALPHA_MASK + 1 - a);
BLEND_OUT(p);
p = (p >> ALPHA_BPP) & 0x07e0f81f;
p |= (p >> 16);
#if (LCD_PIXELFORMAT == RGB565SWAPPED)
return swap16(p);
#else
return p;
#endif
}
static void ICODE_ATTR lcd_alpha_bitmap_part_mix(
const fb_data* image, const unsigned char *alpha,
int src_x, int src_y,
int x, int y, int width, int height,
int stride_image, int stride_alpha)
{
struct viewport *vp = lcd_current_viewport;
unsigned int dmask = 0;
int drmode = vp->drawmode;
fb_data *dst;
#ifdef ALPHA_BITMAP_READ_WORDS
ALPHA_WORD_T alpha_data, *alpha_word;
size_t alpha_offset = 0, alpha_pixels;
#else
unsigned char alpha_data;
size_t alpha_pixels;
#endif
if (!clip_viewport_rect(vp, &x, &y, &width, &height, &src_x, &src_y))
return;
if (drmode & DRMODE_INVERSEVID)
{
dmask = 0xFFFFFFFFu;
drmode &= ~DRMODE_INVERSEVID;
}
if (image != NULL)
drmode |= DRMODE_INT_IMG;
if ((drmode & DRMODE_BG) && lcd_backdrop)
drmode |= DRMODE_INT_BD;
#ifdef ALPHA_BITMAP_READ_WORDS
#define INIT_ALPHA() \
do { \
alpha_offset = src_y * stride_alpha + src_x; \
} while(0)
#define START_ALPHA() \
do { \
size_t __byteskip = (uintptr_t)alpha % ALPHA_WORDSIZE; \
size_t __byteoff = alpha_offset / ALPHA_PIXELS_PER_BYTE; \
alpha_word = (ALPHA_WORD_T *)ALIGN_DOWN(alpha + __byteoff, ALPHA_WORDSIZE); \
alpha_data = ALPHA_WORD_LOAD(alpha_word++) ^ dmask; \
alpha_pixels = ((__byteoff + __byteskip) % ALPHA_WORDSIZE) * ALPHA_PIXELS_PER_BYTE; \
alpha_pixels += alpha_offset % ALPHA_PIXELS_PER_BYTE; \
alpha_data >>= alpha_pixels * ALPHA_BPP; \
alpha_pixels = ALPHA_PIXELS_PER_WORD - alpha_pixels; \
} while(0)
#define END_ALPHA() \
do { \
alpha_offset += stride_alpha; \
} while(0)
#define READ_ALPHA() \
({ \
if (alpha_pixels == 0) { \
alpha_data = ALPHA_WORD_LOAD(alpha_word++) ^ dmask; \
alpha_pixels = ALPHA_PIXELS_PER_WORD; \
} \
ALPHA_WORD_T __ret = alpha_data & ALPHA_MASK; \
alpha_data >>= ALPHA_BPP; \
alpha_pixels--; \
__ret; \
})
#elif ALPHA_BPP == 4
#define INIT_ALPHA() \
do { \
alpha_pixels = src_y * stride_alpha + src_x; \
stride_alpha = stride_alpha - width; \
alpha += alpha_pixels / ALPHA_PIXELS_PER_BYTE; \
alpha_pixels &= 1; \
if (alpha_pixels) { \
alpha_data = *alpha++ ^ dmask; \
alpha_data >>= ALPHA_BPP; \
} \
} while(0)
#define START_ALPHA() do { } while(0)
#define END_ALPHA() \
do { \
if (stride_alpha) { \
alpha_pixels = stride_alpha - alpha_pixels; \
alpha += alpha_pixels / ALPHA_PIXELS_PER_BYTE; \
alpha_pixels &= 1; \
if (alpha_pixels) { \
alpha_data = *alpha++ ^ dmask; \
alpha_data >>= ALPHA_BPP; \
} \
} \
} while(0)
#define READ_ALPHA() \
({ \
if (alpha_pixels == 0) \
alpha_data = *alpha++ ^ dmask; \
unsigned char __ret = alpha_data & ALPHA_MASK; \
alpha_data >>= ALPHA_BPP; \
alpha_pixels ^= 1; \
__ret; \
})
#else
#define INIT_ALPHA() \
do { \
alpha_pixels = src_y * stride_alpha + src_x; \
stride_alpha = stride_alpha - width; \
alpha += alpha_pixels / ALPHA_PIXELS_PER_BYTE; \
alpha_data = *alpha++ ^ dmask; \
alpha_pixels %= ALPHA_PIXELS_PER_BYTE; \
alpha_data >>= ALPHA_BPP * alpha_pixels; \
alpha_pixels = ALPHA_PIXELS_PER_BYTE - alpha_pixels; \
} while(0)
#define START_ALPHA() do { } while(0)
#define END_ALPHA() \
do { \
if ((size_t)stride_alpha <= alpha_pixels) \
alpha_pixels -= stride_alpha; \
else { \
alpha_pixels = stride_alpha - alpha_pixels; \
alpha += alpha_pixels / ALPHA_PIXELS_PER_BYTE; \
alpha_data = *alpha++ ^ dmask; \
alpha_pixels %= ALPHA_PIXELS_PER_BYTE; \
alpha_data >>= ALPHA_BPP * alpha_pixels; \
alpha_pixels = ALPHA_PIXELS_PER_BYTE - alpha_pixels; \
} \
} while(0)
#define READ_ALPHA() \
({ \
if (alpha_pixels == 0) { \
alpha_data = *alpha++ ^ dmask; \
alpha_pixels = ALPHA_PIXELS_PER_BYTE; \
} \
unsigned char __ret = alpha_data & ALPHA_MASK; \
alpha_data >>= ALPHA_BPP; \
alpha_pixels--; \
__ret; \
})
#endif
dst = FBADDR(x, y);
image += STRIDE_MAIN(src_y * stride_image + src_x,
src_x * stride_image + src_y);
INIT_ALPHA();
BLEND_INIT;
do
{
intptr_t bo, io;
unsigned int fg, bg;
int col = width;
fb_data *dst_row = dst;
START_ALPHA();
switch (drmode)
{
case DRMODE_COMPLEMENT:
do
{
*dst = blend_two_colors(*dst, ~(*dst), READ_ALPHA());
dst += COL_INC;
} while (--col);
break;
case DRMODE_BG|DRMODE_INT_BD:
bo = lcd_backdrop_offset;
do
{
*dst = blend_two_colors(*PTR_ADD(dst, bo), *dst, READ_ALPHA());
dst += COL_INC;
} while (--col);
break;
case DRMODE_BG:
bg = vp->bg_pattern;
do
{
*dst = blend_two_colors(bg, *dst, READ_ALPHA());
dst += COL_INC;
} while (--col);
break;
case DRMODE_FG|DRMODE_INT_IMG:
io = image - dst;
do
{
*dst = blend_two_colors(*dst, *(dst + io), READ_ALPHA());
dst += COL_INC;
} while (--col);
break;
case DRMODE_FG:
fg = vp->fg_pattern;
do
{
*dst = blend_two_colors(*dst, fg, READ_ALPHA());
dst += COL_INC;
} while (--col);
break;
case DRMODE_SOLID|DRMODE_INT_BD:
fg = vp->fg_pattern;
bo = lcd_backdrop_offset;
do
{
*dst = blend_two_colors(*PTR_ADD(dst, bo), fg, READ_ALPHA());
dst += COL_INC;
} while (--col);
break;
case DRMODE_SOLID|DRMODE_INT_IMG:
bg = vp->bg_pattern;
io = image - dst;
do
{
*dst = blend_two_colors(bg, *(dst + io), READ_ALPHA());
dst += COL_INC;
} while (--col);
break;
case DRMODE_SOLID|DRMODE_INT_BD|DRMODE_INT_IMG:
bo = lcd_backdrop_offset;
io = image - dst;
do
{
*dst = blend_two_colors(*PTR_ADD(dst, bo), *(dst + io), READ_ALPHA());
dst += COL_INC;
} while (--col);
break;
case DRMODE_SOLID:
fg = vp->fg_pattern;
bg = vp->bg_pattern;
do
{
*dst = blend_two_colors(bg, fg, READ_ALPHA());
dst += COL_INC;
} while (--col);
break;
}
END_ALPHA();
image += STRIDE_MAIN(stride_image, 1);
dst = dst_row + ROW_INC;
} while (--height);
BLEND_FINISH;
}
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