Merge lcd_{alpha,mono}_bitmap_part() for both lcd-16bit. Add small loop optimizations too.

git-svn-id: svn://svn.rockbox.org/rockbox/trunk@29541 a1c6a512-1295-4272-9138-f99709370657

1 files changed, 517 insertions, 0 deletions

diff --git a/firmware/drivers/lcd-16bit-common.c b/firmware/drivers/lcd-16bit-common.c
new file mode 100644
index 0000000000..1e1548e997
--- /dev/null
+++ b/firmware/drivers/lcd-16bit-common.c
@@ -0,0 +1,517 @@
+/***************************************************************************
+ *             __________               __   ___.
+ *   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
+
+/* 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)
+{
+    const unsigned char *src_end;
+    fb_data *dst, *dst_col;
+    unsigned dmask = 0x100; /* bit 8 == sentinel */
+    int drmode = current_vp->drawmode;
+    int row;
+
+    /******************** Image in viewport clipping **********************/
+    /* nothing to draw? */
+    if ((width <= 0) || (height <= 0) || (x >= current_vp->width) || 
+        (y >= current_vp->height) || (x + width <= 0) || (y + height <= 0))
+        return;
+
+    if (x < 0)
+    {
+        width += x;
+        src_x -= x;
+        x = 0;
+    }
+    if (y < 0)
+    {
+        height += y;
+        src_y -= y;
+        y = 0;
+    }
+    if (x + width > current_vp->width)
+        width = current_vp->width - x;
+    if (y + height > current_vp->height)
+        height = current_vp->height - y;
+        
+    /* adjust for viewport */
+    x += current_vp->x;
+    y += current_vp->y;
+        
+#if defined(HAVE_VIEWPORT_CLIP)
+    /********************* Viewport on screen clipping ********************/
+    /* nothing to draw? */
+    if ((x >= LCD_WIDTH) || (y >= LCD_HEIGHT) 
+        || (x + width <= 0) || (y + height <= 0))
+        return;
+    
+    /* clip image in viewport in screen */
+    if (x < 0)
+    {
+        width += x;
+        src_x -= x;
+        x = 0;
+    }
+    if (y < 0)
+    {
+        height += y;
+        src_y -= y;
+        y = 0;
+    }
+    if (x + width > LCD_WIDTH)
+        width = LCD_WIDTH - x;
+    if (y + height > LCD_HEIGHT)
+        height = LCD_HEIGHT - y;
+#endif
+
+    src += stride * (src_y >> 3) + src_x; /* move starting point */
+    src_y  &= 7;
+    src_end = src + width;
+    dst_col = LCDADDR(x, y);
+    
+
+    if (drmode & DRMODE_INVERSEVID)
+    {
+        dmask = 0x1ff;          /* bit 8 == sentinel */
+        drmode &= DRMODE_SOLID; /* mask out inversevid */
+    }
+
+    /* go through each column and update each pixel  */
+    do
+    {
+        const unsigned char *src_col = src++;
+        unsigned data = (*src_col ^ dmask) >> src_y;
+        int fg, bg;
+        long bo;
+
+        dst = dst_col;
+        dst_col += COL_INC;
+        row = height;
+
+#define UPDATE_SRC  do {                  \
+            data >>= 1;                   \
+            if (data == 0x001) {          \
+                src_col += stride;        \
+                data = *src_col ^ dmask;  \
+            }                             \
+        } while (0)
+
+        switch (drmode)
+        {
+          case DRMODE_COMPLEMENT:
+            do
+            {
+                if (data & 0x01)
+                    *dst = ~(*dst);
+
+                dst += ROW_INC;
+                UPDATE_SRC;
+            }
+            while (--row);
+            break;
+
+          case DRMODE_BG:
+            if (lcd_backdrop)
+            {
+                bo = lcd_backdrop_offset;
+                do
+                {
+                    if (!(data & 0x01))
+                        *dst = *(fb_data *)((long)dst + bo);
+
+                    dst += ROW_INC;
+                    UPDATE_SRC;
+                }
+                while (--row);
+            }
+            else
+            {
+                bg = current_vp->bg_pattern;
+                do
+                {
+                    if (!(data & 0x01))
+                        *dst = bg;
+
+                    dst += ROW_INC;
+                    UPDATE_SRC;
+                }
+                while (--row);
+            }
+            break;
+
+          case DRMODE_FG:
+            fg = current_vp->fg_pattern;
+            do
+            {
+                if (data & 0x01)
+                    *dst = fg;
+
+                dst += ROW_INC;
+                UPDATE_SRC;
+            }
+            while (--row);
+            break;
+
+          case DRMODE_SOLID:
+            fg = current_vp->fg_pattern;
+            if (lcd_backdrop)
+            {
+                bo = lcd_backdrop_offset;
+                do
+                {
+                    *dst = (data & 0x01) ? fg 
+                               : *(fb_data *)((long)dst + bo);
+                    dst += ROW_INC;
+                    UPDATE_SRC;
+                }
+                while (--row);
+            }
+            else
+            {
+                bg = current_vp->bg_pattern;
+                do
+                {
+                    *dst = (data & 0x01) ? fg : bg;
+                    dst += ROW_INC;
+                    UPDATE_SRC;
+                }
+                while (--row);
+            }
+            break;
+        }
+    }
+    while (src < src_end);
+}
+/* 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);
+}
+
+/* draw alpha bitmap for anti-alias font */
+#define ALPHA_COLOR_FONT_DEPTH 2
+#define ALPHA_COLOR_LOOKUP_SHIFT (1 << ALPHA_COLOR_FONT_DEPTH)
+#define ALPHA_COLOR_LOOKUP_SIZE ((1 << ALPHA_COLOR_LOOKUP_SHIFT) - 1)
+#define ALPHA_COLOR_PIXEL_PER_BYTE (8 >> ALPHA_COLOR_FONT_DEPTH)
+#define ALPHA_COLOR_PIXEL_PER_WORD (32 >> ALPHA_COLOR_FONT_DEPTH)
+#ifdef CPU_ARM
+#define BLEND_INIT 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 coldfire_set_macsr(EMAC_UNSIGNED)
+#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_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_COLOR_LOOKUP_SHIFT - 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_COLOR_LOOKUP_SIZE + 1 - a);
+    BLEND_OUT(p);
+    p = (p >> ALPHA_COLOR_LOOKUP_SHIFT) & 0x07e0f81f;
+    p |= (p >> 16);
+#if (LCD_PIXELFORMAT == RGB565SWAPPED)
+    return swap16(p);
+#else
+    return p;
+#endif
+}
+
+/* Blend the given color with the value from the alpha_color_lookup table */
+static inline unsigned blend_color(unsigned c, unsigned a)
+{
+    return blend_two_colors(c, current_vp->fg_pattern, a);
+}
+
+void ICODE_ATTR lcd_alpha_bitmap_part(const unsigned char *src, int src_x,
+                                      int src_y, int stride, int x, int y,
+                                      int width, int height)
+{
+    fb_data *dst, *dst_row;
+    unsigned dmask = 0x00000000;
+    int drmode = current_vp->drawmode;
+    /* nothing to draw? */
+    if ((width <= 0) || (height <= 0) || (x >= current_vp->width) ||
+         (y >= current_vp->height) || (x + width <= 0) || (y + height <= 0))
+        return;
+    /* initialize blending */
+    BLEND_INIT;
+
+    /* clipping */
+    if (x < 0)
+    {
+        width += x;
+        src_x -= x;
+        x = 0;
+    }
+    if (y < 0)
+    {
+        height += y;
+        src_y -= y;
+        y = 0;
+    }
+    if (x + width > current_vp->width)
+        width = current_vp->width - x;
+    if (y + height > current_vp->height)
+        height = current_vp->height - y;
+
+    /* adjust for viewport */
+    x += current_vp->x;
+    y += current_vp->y;
+
+#if defined(HAVE_VIEWPORT_CLIP)
+    /********************* Viewport on screen clipping ********************/
+    /* nothing to draw? */
+    if ((x >= LCD_WIDTH) || (y >= LCD_HEIGHT) 
+        || (x + width <= 0) || (y + height <= 0))
+        return;
+    
+    /* clip image in viewport in screen */
+    if (x < 0)
+    {
+        width += x;
+        src_x -= x;
+        x = 0;
+    }
+    if (y < 0)
+    {
+        height += y;
+        src_y -= y;
+        y = 0;
+    }
+    if (x + width > LCD_WIDTH)
+        width = LCD_WIDTH - x;
+    if (y + height > LCD_HEIGHT)
+        height = LCD_HEIGHT - y;
+#endif
+
+    if (drmode & DRMODE_INVERSEVID)
+    {
+        dmask = 0xffffffff;
+        drmode &= DRMODE_SOLID; /* mask out inversevid */
+    }
+    if (drmode == DRMODE_BG)
+    {
+        dmask = ~dmask;
+    }
+
+    dst_row = LCDADDR(x, y);
+
+    int col, row = height;
+    unsigned data, pixels;
+    unsigned skip_end = (stride - width);
+    unsigned skip_start = src_y * stride + src_x;
+
+#ifdef ALPHA_BITMAP_READ_WORDS
+    uint32_t *src_w = (uint32_t *)((uintptr_t)src & ~3);
+    skip_start += ALPHA_COLOR_PIXEL_PER_BYTE * ((uintptr_t)src & 3);
+    src_w += skip_start / ALPHA_COLOR_PIXEL_PER_WORD;
+    data = letoh32(*src_w++) ^ dmask;
+    pixels = skip_start % ALPHA_COLOR_PIXEL_PER_WORD;
+#else
+    src += skip_start / ALPHA_COLOR_PIXEL_PER_BYTE;
+    data = *src ^ dmask;
+    pixels = skip_start % ALPHA_COLOR_PIXEL_PER_BYTE;
+#endif
+    data >>= pixels * ALPHA_COLOR_LOOKUP_SHIFT;
+#ifdef ALPHA_BITMAP_READ_WORDS
+    pixels = 8 - pixels;
+#endif
+
+    /* go through the rows and update each pixel */
+    do
+    {
+        col = width;
+        dst = dst_row;
+        dst_row += ROW_INC;
+#ifdef ALPHA_BITMAP_READ_WORDS
+#define UPDATE_SRC_ALPHA    do { \
+            if (--pixels) \
+                data >>= ALPHA_COLOR_LOOKUP_SHIFT; \
+            else \
+            { \
+                data = letoh32(*src_w++) ^ dmask; \
+                pixels = ALPHA_COLOR_PIXEL_PER_WORD; \
+            } \
+        } while (0)
+#elif ALPHA_COLOR_PIXEL_PER_BYTE == 2
+#define UPDATE_SRC_ALPHA    do { \
+            if (pixels ^= 1) \
+                data >>= ALPHA_COLOR_LOOKUP_SHIFT; \
+            else \
+                data = *(++src) ^ dmask; \
+        } while (0)
+#else
+#define UPDATE_SRC_ALPHA    do { \
+            if (pixels = (++pixels % ALPHA_COLOR_PIXEL_PER_BYTE)) \
+                data >>= ALPHA_COLOR_LOOKUP_SHIFT; \
+            else \
+                data = *(++src) ^ dmask; \
+        } while (0)
+#endif
+        /* we don't want to have this in our inner
+         * loop and the codesize increase is minimal */
+        switch (drmode)
+        {
+            case DRMODE_COMPLEMENT:
+                do
+                {
+                    *dst = blend_two_colors(*dst, ~(*dst),
+                                data & ALPHA_COLOR_LOOKUP_SIZE );
+                    dst += COL_INC;
+                    UPDATE_SRC_ALPHA;
+                }
+                while (--col);
+                break;
+            case DRMODE_BG:
+                if(lcd_backdrop)
+                {
+                    uintptr_t bo = lcd_backdrop_offset;
+                    do
+                    {
+                        *dst = blend_two_colors(*dst, *(fb_data *)((uintptr_t)dst + bo),
+                                    data & ALPHA_COLOR_LOOKUP_SIZE );
+
+                        dst += COL_INC;
+                        UPDATE_SRC_ALPHA;
+                    }
+                    while (--col);
+                }
+                else
+                {
+                    do
+                    {
+                        *dst = blend_two_colors(*dst, current_vp->bg_pattern,
+                                    data & ALPHA_COLOR_LOOKUP_SIZE );
+                        dst += COL_INC;
+                        UPDATE_SRC_ALPHA;
+                    }
+                    while (--col);
+                }
+                break;
+            case DRMODE_FG:
+                do
+                {
+                    *dst = blend_color(*dst, data & ALPHA_COLOR_LOOKUP_SIZE );
+                    dst += COL_INC;
+                    UPDATE_SRC_ALPHA;
+                }
+                while (--col);
+                break;
+            case DRMODE_SOLID:
+                if(lcd_backdrop)
+                {
+                    uintptr_t bo = lcd_backdrop_offset;
+                    do
+                    {
+                        *dst = blend_color(*(fb_data *)((uintptr_t)dst + bo),
+                                        data & ALPHA_COLOR_LOOKUP_SIZE );
+                        dst += COL_INC;
+                        UPDATE_SRC_ALPHA;
+                    }
+                    while (--col);
+                }
+                else
+                {
+                    do
+                    {
+                        *dst = blend_color(current_vp->bg_pattern,
+                                        data & ALPHA_COLOR_LOOKUP_SIZE );
+                        dst += COL_INC;
+                        UPDATE_SRC_ALPHA;
+                    }
+                    while (--col);
+                }
+                break;
+        }
+#ifdef ALPHA_BITMAP_READ_WORDS
+        if (skip_end < pixels)
+        {
+            pixels -= skip_end;
+            data >>= skip_end * ALPHA_COLOR_LOOKUP_SHIFT;
+        } else {
+            pixels = skip_end - pixels;
+            src_w += pixels / ALPHA_COLOR_PIXEL_PER_WORD;
+            pixels %= ALPHA_COLOR_PIXEL_PER_WORD;
+            data = letoh32(*src_w++) ^ dmask;
+            data >>= pixels * ALPHA_COLOR_LOOKUP_SHIFT;
+            pixels = 8 - pixels;
+        }
+#else
+        if (skip_end)
+        {
+            pixels += skip_end;
+            if (pixels >= ALPHA_COLOR_PIXEL_PER_BYTE)
+            {
+                src += pixels / ALPHA_COLOR_PIXEL_PER_BYTE;
+                pixels %= ALPHA_COLOR_PIXEL_PER_BYTE;
+                data = *src ^ dmask;
+                data >>= pixels * ALPHA_COLOR_LOOKUP_SHIFT;
+            } else
+                data >>= skip_end * ALPHA_COLOR_LOOKUP_SHIFT;
+        }
+#endif
+    } while (--row);
+}