lcd: Rewrite 16bit alpha bitmap blit
Avoids a harmless out of bounds reads in ASAN that occurs with malloc buflib. Code size and performance is similar. Change-Id: I1c674d046b069e64ad8cb6941356f7c568a81e88
This commit is contained in:
Aidan MacDonald
parent
b444ecfca2
commit
5d0c382a59
1 changed files with 220 additions and 225 deletions
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@ -336,7 +336,7 @@ void lcd_mono_bitmap(const unsigned char *src, int x, int y, int width, int heig
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}
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/* About Rockbox' internal alpha channel format (for ALPHA_COLOR_FONT_DEPTH == 2)
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/* About Rockbox' internal alpha channel format (for ALPHA_BPP == 4)
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*
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* For each pixel, 4bit of alpha information is stored in a byte-stream,
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* so two pixels are packed into one byte.
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@ -355,11 +355,15 @@ void lcd_mono_bitmap(const unsigned char *src, int x, int y, int width, int heig
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* so lcd_bmp() do expect even rows.
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*/
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#define ALPHA_COLOR_FONT_DEPTH 2
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#define ALPHA_COLOR_LOOKUP_SHIFT (1 << ALPHA_COLOR_FONT_DEPTH)
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#define ALPHA_COLOR_LOOKUP_SIZE ((1 << ALPHA_COLOR_LOOKUP_SHIFT) - 1)
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#define ALPHA_COLOR_PIXEL_PER_BYTE (8 >> ALPHA_COLOR_FONT_DEPTH)
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#define ALPHA_COLOR_PIXEL_PER_WORD (32 >> ALPHA_COLOR_FONT_DEPTH)
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#define ALPHA_BPP 4
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#define ALPHA_MASK ((1 << ALPHA_BPP) - 1)
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#define ALPHA_PIXELS_PER_BYTE (CHAR_BIT / ALPHA_BPP)
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#define ALPHA_WORD_T uint32_t
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#define ALPHA_WORD_LOAD load_le32
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#define ALPHA_WORDSIZE sizeof(ALPHA_WORD_T)
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#define ALPHA_PIXELS_PER_WORD (ALPHA_WORDSIZE * CHAR_BIT / ALPHA_BPP)
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#ifdef CPU_ARM
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#define BLEND_INIT do {} while (0)
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#define BLEND_FINISH do {} while(0)
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@ -368,6 +372,7 @@ void lcd_mono_bitmap(const unsigned char *src, int x, int y, int width, int heig
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#define BLEND_CONT(acc, color, alpha) \
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asm volatile("mla %0, %1, %2, %0" : "+&r" (acc) : "r" (color), "r" (alpha))
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#define BLEND_OUT(acc) do {} while (0)
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#elif defined(CPU_COLDFIRE)
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#define ALPHA_BITMAP_READ_WORDS
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#define BLEND_INIT \
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@ -379,6 +384,7 @@ void lcd_mono_bitmap(const unsigned char *src, int x, int y, int width, int heig
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asm volatile("mac.l %0, %1, %%acc0" :: "%d" (color), "d" (alpha))
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#define BLEND_CONT BLEND_START
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#define BLEND_OUT(acc) asm volatile("movclr.l %%acc0, %0" : "=d" (acc))
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#else
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#define BLEND_INIT do {} while (0)
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#define BLEND_FINISH do {} while(0)
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@ -390,7 +396,7 @@ void lcd_mono_bitmap(const unsigned char *src, int x, int y, int width, int heig
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/* Blend the given two colors */
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static inline unsigned blend_two_colors(unsigned c1, unsigned c2, unsigned a)
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{
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a += a >> (ALPHA_COLOR_LOOKUP_SHIFT - 1);
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a += a >> (ALPHA_BPP - 1);
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#if (LCD_PIXELFORMAT == RGB565SWAPPED)
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c1 = swap16(c1);
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c2 = swap16(c2);
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@ -399,9 +405,9 @@ static inline unsigned blend_two_colors(unsigned c1, unsigned c2, unsigned a)
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unsigned c2l = (c2 | (c2 << 16)) & 0x07e0f81f;
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unsigned p;
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BLEND_START(p, c1l, a);
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BLEND_CONT(p, c2l, ALPHA_COLOR_LOOKUP_SIZE + 1 - a);
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BLEND_CONT(p, c2l, ALPHA_MASK + 1 - a);
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BLEND_OUT(p);
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p = (p >> ALPHA_COLOR_LOOKUP_SHIFT) & 0x07e0f81f;
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p = (p >> ALPHA_BPP) & 0x07e0f81f;
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p |= (p >> 16);
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#if (LCD_PIXELFORMAT == RGB565SWAPPED)
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return swap16(p);
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@ -410,251 +416,240 @@ static inline unsigned blend_two_colors(unsigned c1, unsigned c2, unsigned a)
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#endif
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}
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/* Blend an image with an alpha channel
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* if image is NULL, drawing will happen according to the drawmode
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* src is the alpha channel (4bit per pixel) */
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static void ICODE_ATTR lcd_alpha_bitmap_part_mix(const fb_data* image,
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const unsigned char *src, int src_x,
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int src_y, int x, int y,
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int width, int height,
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int stride_image, int stride_src)
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static void ICODE_ATTR lcd_alpha_bitmap_part_mix(
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const fb_data* image, const unsigned char *alpha,
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int src_x, int src_y,
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int x, int y, int width, int height,
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int stride_image, int stride_alpha)
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{
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struct viewport *vp = lcd_current_viewport;
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fb_data *dst, *dst_row;
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unsigned dmask = 0x00000000;
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unsigned int dmask = 0;
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int drmode = vp->drawmode;
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fb_data *dst;
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#ifdef ALPHA_BITMAP_READ_WORDS
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ALPHA_WORD_T alpha_data, *alpha_word;
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size_t alpha_offset = 0, alpha_pixels;
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#else
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unsigned char alpha_data;
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size_t alpha_pixels;
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#endif
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if (!clip_viewport_rect(vp, &x, &y, &width, &height, &src_x, &src_y))
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return;
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/* initialize blending */
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BLEND_INIT;
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/* the following drawmode combinations are possible:
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* 1) COMPLEMENT: just negates the framebuffer contents
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* 2) BG and BG+backdrop: draws _only_ background pixels with either
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* the background color or the backdrop (if any). The backdrop
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* is an image in native lcd format
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* 3) FG and FG+image: draws _only_ foreground pixels with either
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* the foreground color or an image buffer. The image is in
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* native lcd format
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* 4) SOLID, SOLID+backdrop, SOLID+image, SOLID+backdrop+image, i.e. all
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* possible combinations of 2) and 3). Draws both, fore- and background,
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* pixels. The rules of 2) and 3) apply.
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*
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* INVERSEVID swaps fore- and background pixels, i.e. background pixels
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* become foreground ones and vice versa.
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*/
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if (drmode & DRMODE_INVERSEVID)
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{
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dmask = 0xffffffff;
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drmode &= DRMODE_SOLID; /* mask out inversevid */
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dmask = 0xFFFFFFFFu;
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drmode &= ~DRMODE_INVERSEVID;
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}
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/* Use extra bits to avoid if () in the switch-cases below */
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if (image != NULL)
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drmode |= DRMODE_INT_IMG;
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if ((drmode & DRMODE_BG) && lcd_backdrop)
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drmode |= DRMODE_INT_BD;
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dst_row = FBADDR(x, y);
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int col, row = height;
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unsigned data, pixels;
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unsigned skip_end = (stride_src - width);
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unsigned skip_start = src_y * stride_src + src_x;
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unsigned skip_start_image = STRIDE_MAIN(src_y * stride_image + src_x,
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src_x * stride_image + src_y);
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#ifdef ALPHA_BITMAP_READ_WORDS
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uint32_t *src_w = (uint32_t *)((uintptr_t)src & ~3);
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skip_start += ALPHA_COLOR_PIXEL_PER_BYTE * ((uintptr_t)src & 3);
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src_w += skip_start / ALPHA_COLOR_PIXEL_PER_WORD;
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data = letoh32(*src_w++) ^ dmask;
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pixels = skip_start % ALPHA_COLOR_PIXEL_PER_WORD;
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#define INIT_ALPHA() \
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do { \
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alpha_offset = src_y * stride_alpha + src_x; \
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} while(0)
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#define START_ALPHA() \
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do { \
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size_t __byteskip = (uintptr_t)alpha % ALPHA_WORDSIZE; \
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size_t __byteoff = alpha_offset / ALPHA_PIXELS_PER_BYTE; \
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alpha_word = (ALPHA_WORD_T *)ALIGN_DOWN(alpha + __byteoff, ALPHA_WORDSIZE); \
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alpha_data = ALPHA_WORD_LOAD(alpha_word++) ^ dmask; \
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alpha_pixels = ((__byteoff + __byteskip) % ALPHA_WORDSIZE) * ALPHA_PIXELS_PER_BYTE; \
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alpha_pixels += alpha_offset % ALPHA_PIXELS_PER_BYTE; \
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alpha_data >>= alpha_pixels * ALPHA_BPP; \
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alpha_pixels = ALPHA_PIXELS_PER_WORD - alpha_pixels; \
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} while(0)
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#define END_ALPHA() \
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do { \
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alpha_offset += stride_alpha; \
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} while(0)
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#define READ_ALPHA() \
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({ \
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if (alpha_pixels == 0) { \
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alpha_data = ALPHA_WORD_LOAD(alpha_word++) ^ dmask; \
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alpha_pixels = ALPHA_PIXELS_PER_WORD; \
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} \
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ALPHA_WORD_T __ret = alpha_data & ALPHA_MASK; \
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alpha_data >>= ALPHA_BPP; \
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alpha_pixels--; \
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__ret; \
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})
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#elif ALPHA_BPP == 4
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#define INIT_ALPHA() \
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do { \
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alpha_pixels = src_y * stride_alpha + src_x; \
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stride_alpha = stride_alpha - width; \
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alpha += alpha_pixels / ALPHA_PIXELS_PER_BYTE; \
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alpha_pixels &= 1; \
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if (alpha_pixels) { \
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alpha_data = *alpha++ ^ dmask; \
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alpha_data >>= ALPHA_BPP; \
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} \
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} while(0)
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#define START_ALPHA() do { } while(0)
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#define END_ALPHA() \
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do { \
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if (stride_alpha) { \
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alpha_pixels = stride_alpha - alpha_pixels; \
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alpha += alpha_pixels / ALPHA_PIXELS_PER_BYTE; \
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alpha_data = *alpha++ ^ dmask; \
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alpha_pixels &= 1; \
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if (alpha_pixels) \
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alpha_data >>= ALPHA_BPP; \
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} \
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} while(0)
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#define READ_ALPHA() \
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({ \
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if (alpha_pixels == 0) \
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alpha_data = *alpha++ ^ dmask; \
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unsigned char __ret = alpha_data & ALPHA_MASK; \
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alpha_data >>= ALPHA_BPP; \
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alpha_pixels ^= 1; \
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__ret; \
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})
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#else
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src += skip_start / ALPHA_COLOR_PIXEL_PER_BYTE;
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data = *src ^ dmask;
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pixels = skip_start % ALPHA_COLOR_PIXEL_PER_BYTE;
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#endif
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data >>= pixels * ALPHA_COLOR_LOOKUP_SHIFT;
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#ifdef ALPHA_BITMAP_READ_WORDS
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pixels = 8 - pixels;
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#define INIT_ALPHA() \
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do { \
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alpha_pixels = src_y * stride_alpha + src_x; \
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stride_alpha = stride_alpha - width; \
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alpha += alpha_pixels / ALPHA_PIXELS_PER_BYTE; \
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alpha_data = *alpha++ ^ dmask; \
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alpha_pixels %= ALPHA_PIXELS_PER_BYTE; \
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alpha_data >>= ALPHA_BPP * alpha_pixels; \
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alpha_pixels = ALPHA_PIXELS_PER_BYTE - alpha_pixels; \
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} while(0)
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#define START_ALPHA() do { } while(0)
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#define END_ALPHA() \
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do { \
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if ((size_t)stride_alpha <= alpha_pixels) \
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alpha_pixels -= stride_alpha; \
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else { \
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alpha_pixels = stride_alpha - alpha_pixels; \
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alpha += alpha_pixels / ALPHA_PIXELS_PER_BYTE; \
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alpha_data = *alpha++ ^ dmask; \
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alpha_pixels %= ALPHA_PIXELS_PER_BYTE; \
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alpha_data >>= ALPHA_BPP * alpha_pixels; \
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alpha_pixels = ALPHA_PIXELS_PER_BYTE - alpha_pixels; \
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} \
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} while(0)
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#define READ_ALPHA() \
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({ \
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if (alpha_pixels == 0) { \
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alpha_data = *alpha++ ^ dmask; \
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alpha_pixels = ALPHA_PIXELS_PER_BYTE; \
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} \
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unsigned char __ret = alpha_data & ALPHA_MASK; \
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alpha_data >>= ALPHA_BPP; \
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alpha_pixels--; \
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__ret; \
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})
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#endif
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/* image is only accessed in DRMODE_INT_IMG cases, i.e. when non-NULL.
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* Therefore NULL accesses are impossible and we can increment
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* unconditionally (applies for stride at the end of the loop as well) */
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image += skip_start_image;
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/* go through the rows and update each pixel */
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dst = FBADDR(x, y);
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image += STRIDE_MAIN(src_y * stride_image + src_x,
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src_x * stride_image + src_y);
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INIT_ALPHA();
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BLEND_INIT;
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do
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{
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/* saving lcd_current_viewport->fg/bg_pattern and lcd_backdrop_offset into these
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* temp vars just before the loop helps gcc to opimize the loop better
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* (testing showed ~15% speedup) */
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unsigned fg, bg;
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ptrdiff_t bo, img_offset;
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col = width;
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dst = dst_row;
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dst_row += ROW_INC;
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#ifdef ALPHA_BITMAP_READ_WORDS
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#define UPDATE_SRC_ALPHA do { \
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if (--pixels) \
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data >>= ALPHA_COLOR_LOOKUP_SHIFT; \
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else \
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{ \
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data = letoh32(*src_w++) ^ dmask; \
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pixels = ALPHA_COLOR_PIXEL_PER_WORD; \
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} \
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} while (0)
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#elif ALPHA_COLOR_PIXEL_PER_BYTE == 2
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#define UPDATE_SRC_ALPHA do { \
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if (pixels ^= 1) \
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data >>= ALPHA_COLOR_LOOKUP_SHIFT; \
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else \
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data = *(++src) ^ dmask; \
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} while (0)
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#else
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#define UPDATE_SRC_ALPHA do { \
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if (pixels = (++pixels % ALPHA_COLOR_PIXEL_PER_BYTE)) \
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data >>= ALPHA_COLOR_LOOKUP_SHIFT; \
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else \
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data = *(++src) ^ dmask; \
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} while (0)
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#endif
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intptr_t bo, io;
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unsigned int fg, bg;
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int col = width;
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fb_data *dst_row = dst;
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START_ALPHA();
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switch (drmode)
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{
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case DRMODE_COMPLEMENT:
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do
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{
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*dst = blend_two_colors(*dst, ~(*dst),
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data & ALPHA_COLOR_LOOKUP_SIZE );
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dst += COL_INC;
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UPDATE_SRC_ALPHA;
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}
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while (--col);
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break;
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case DRMODE_BG|DRMODE_INT_BD:
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bo = lcd_backdrop_offset;
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do
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{
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fb_data c = *(fb_data *)((uintptr_t)dst + bo);
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*dst = blend_two_colors(c, *dst, data & ALPHA_COLOR_LOOKUP_SIZE );
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dst += COL_INC;
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image += STRIDE_MAIN(1, stride_image);
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UPDATE_SRC_ALPHA;
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}
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while (--col);
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break;
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case DRMODE_BG:
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bg = vp->bg_pattern;
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do
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{
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*dst = blend_two_colors(bg, *dst, data & ALPHA_COLOR_LOOKUP_SIZE );
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dst += COL_INC;
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UPDATE_SRC_ALPHA;
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}
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while (--col);
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break;
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case DRMODE_FG|DRMODE_INT_IMG:
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img_offset = image - dst;
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do
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{
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*dst = blend_two_colors(*dst, *(dst + img_offset), data & ALPHA_COLOR_LOOKUP_SIZE );
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dst += COL_INC;
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UPDATE_SRC_ALPHA;
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}
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while (--col);
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break;
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case DRMODE_FG:
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fg = vp->fg_pattern;
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do
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{
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*dst = blend_two_colors(*dst, fg, data & ALPHA_COLOR_LOOKUP_SIZE );
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dst += COL_INC;
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UPDATE_SRC_ALPHA;
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}
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while (--col);
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break;
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case DRMODE_SOLID|DRMODE_INT_BD:
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bo = lcd_backdrop_offset;
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fg = vp->fg_pattern;
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do
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{
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fb_data *c = (fb_data *)((uintptr_t)dst + bo);
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*dst = blend_two_colors(*c, fg, data & ALPHA_COLOR_LOOKUP_SIZE );
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dst += COL_INC;
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UPDATE_SRC_ALPHA;
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}
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while (--col);
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break;
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case DRMODE_SOLID|DRMODE_INT_IMG:
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bg = vp->bg_pattern;
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img_offset = image - dst;
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do
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{
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*dst = blend_two_colors(bg, *(dst + img_offset), data & ALPHA_COLOR_LOOKUP_SIZE );
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dst += COL_INC;
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UPDATE_SRC_ALPHA;
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}
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while (--col);
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break;
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case DRMODE_SOLID|DRMODE_INT_BD|DRMODE_INT_IMG:
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bo = lcd_backdrop_offset;
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img_offset = image - dst;
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do
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{
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fb_data *c = (fb_data *)((uintptr_t)dst + bo);
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*dst = blend_two_colors(*c, *(dst + img_offset), data & ALPHA_COLOR_LOOKUP_SIZE );
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dst += COL_INC;
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UPDATE_SRC_ALPHA;
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}
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while (--col);
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break;
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case DRMODE_SOLID:
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bg = vp->bg_pattern;
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fg = vp->fg_pattern;
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do
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{
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*dst = blend_two_colors(bg, fg, data & ALPHA_COLOR_LOOKUP_SIZE );
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dst += COL_INC;
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UPDATE_SRC_ALPHA;
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}
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while (--col);
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break;
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}
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#ifdef ALPHA_BITMAP_READ_WORDS
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if (skip_end < pixels)
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{
|
||||
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)
|
||||
case DRMODE_COMPLEMENT:
|
||||
do
|
||||
{
|
||||
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;
|
||||
*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;
|
||||
}
|
||||
#endif
|
||||
|
||||
image += STRIDE_MAIN(stride_image,1);
|
||||
} while (--row);
|
||||
END_ALPHA();
|
||||
image += STRIDE_MAIN(stride_image, 1);
|
||||
dst = dst_row + ROW_INC;
|
||||
} while (--height);
|
||||
|
||||
BLEND_FINISH;
|
||||
}
|
||||
|
|
|
|||
Loading…
Reference in a new issue