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Utilize pixman for efficient pixel manipulation
According to issue #6, I replace original image compositing and trapezoid rasterization with Pixman function. Breifly, include: - pixman_image_composite: image compositing - pixman_image_fill_rectangles: fill the image with rectangles For the implementation changes: 1. add a configurable option to build. It will reduce the code bloat. 2. use the same public interface to maintain the source-level compatibility.
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,192 @@ | ||
| /* | ||
| * Twin - A Tiny Window System | ||
| * Copyright (c) 2024 National Cheng Kung University, Taiwan | ||
| * All rights reserved. | ||
| */ | ||
|
|
||
| #include <pixman.h> | ||
| #include "twin_private.h" | ||
|
|
||
| static void twin_argb32_to_pixman_color(twin_argb32_t argb, | ||
| pixman_color_t *color) | ||
| { | ||
| /* Extract ARGB every Byte */ | ||
| uint16_t a = (argb >> 24) & 0xFF; | ||
| uint16_t r = (argb >> 16) & 0xFF; | ||
| uint16_t g = (argb >> 8) & 0xFF; | ||
| uint16_t b = argb & 0xFF; | ||
|
|
||
| /* 8bits -> 16bits (255 -> 65535) */ | ||
| color->alpha = (a << 8) + a; | ||
| color->red = (r << 8) + r; | ||
| color->green = (g << 8) + g; | ||
| color->blue = (b << 8) + b; | ||
| } | ||
|
|
||
| static const pixman_format_code_t twin_pixman_format[3] = { | ||
| [TWIN_A8] = PIXMAN_a8, | ||
| [TWIN_RGB16] = PIXMAN_r5g6b5, | ||
| [TWIN_ARGB32] = PIXMAN_a8r8g8b8}; | ||
|
|
||
| static pixman_format_code_t twin_to_pixman_format( | ||
| const twin_format_t twin_format) | ||
| { | ||
| return twin_pixman_format[twin_format]; | ||
| } | ||
|
|
||
| static const pixman_op_t twin_pixman_op[2] = | ||
| {[TWIN_OVER] = PIXMAN_OP_OVER, [TWIN_SOURCE] = PIXMAN_OP_SRC}; | ||
|
|
||
| static pixman_op_t twin_to_pixman_op(const twin_operator_t twin_op) | ||
| { | ||
| return twin_pixman_op[twin_op]; | ||
| } | ||
|
|
||
| #define create_pixman_image_from_twin_pixmap(pixmap) \ | ||
| ({ \ | ||
| typeof(pixmap) _pixmap = (pixmap); \ | ||
| pixman_image_create_bits(twin_to_pixman_format((_pixmap)->format), \ | ||
| (_pixmap)->width, (_pixmap)->height, \ | ||
| (_pixmap)->p.argb32, (_pixmap)->stride); \ | ||
| }) | ||
|
|
||
| static void pixmap_matrix_scale(pixman_image_t *src, twin_matrix_t *matrix) | ||
| { | ||
| pixman_transform_t transform; | ||
| pixman_transform_init_identity(&transform); | ||
|
|
||
| pixman_fixed_t sx = matrix->m[0][0], sy = matrix->m[1][1]; | ||
|
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| pixman_transform_scale(&transform, NULL, sx, sy); | ||
| pixman_image_set_transform(src, &transform); | ||
| } | ||
|
|
||
| void twin_composite(twin_pixmap_t *_dst, | ||
| twin_coord_t dst_x, | ||
| twin_coord_t dst_y, | ||
| twin_operand_t *_src, | ||
| twin_coord_t src_x, | ||
| twin_coord_t src_y, | ||
| twin_operand_t *_msk, | ||
| twin_coord_t msk_x, | ||
| twin_coord_t msk_y, | ||
| twin_operator_t operator, | ||
| twin_coord_t width, | ||
| twin_coord_t height) | ||
| { | ||
| pixman_image_t *src; | ||
| if (_src->source_kind == TWIN_SOLID) { | ||
| pixman_color_t source_pixel; | ||
| twin_argb32_to_pixman_color(_src->u.argb, &source_pixel); | ||
| src = pixman_image_create_solid_fill(&source_pixel); | ||
| } else { | ||
| twin_pixmap_t *src_pixmap = _src->u.pixmap; | ||
| src = create_pixman_image_from_twin_pixmap(src_pixmap); | ||
|
|
||
| if (!twin_matrix_is_identity(&(src_pixmap->transform))) | ||
| pixmap_matrix_scale(src, &(src_pixmap->transform)); | ||
| } | ||
|
|
||
| pixman_image_t *dst = create_pixman_image_from_twin_pixmap(_dst); | ||
|
|
||
| /* Set origin */ | ||
| twin_coord_t ox, oy; | ||
| twin_pixmap_get_origin(_dst, &ox, &oy); | ||
| ox += dst_x; | ||
| oy += dst_y; | ||
|
|
||
| if (!_msk) { | ||
| pixman_image_composite(twin_to_pixman_op(operator), src, NULL, dst, | ||
| src_x, src_y, 0, 0, ox, oy, width, height); | ||
| } else { | ||
| pixman_image_t *msk = | ||
| create_pixman_image_from_twin_pixmap(_msk->u.pixmap); | ||
| pixman_image_composite(twin_to_pixman_op(operator), src, msk, dst, | ||
| src_x, src_y, msk_x, msk_y, ox, oy, width, | ||
| height); | ||
| pixman_image_unref(msk); | ||
| } | ||
|
|
||
| pixman_image_unref(src); | ||
| pixman_image_unref(dst); | ||
| } | ||
|
|
||
| void twin_fill(twin_pixmap_t *_dst, | ||
| twin_argb32_t pixel, | ||
| twin_operator_t operator, | ||
| twin_coord_t left, | ||
| twin_coord_t top, | ||
| twin_coord_t right, | ||
| twin_coord_t bottom) | ||
| { | ||
| /* offset */ | ||
| left += _dst->origin_x; | ||
| top += _dst->origin_y; | ||
| right += _dst->origin_x; | ||
| bottom += _dst->origin_y; | ||
|
|
||
| /* clip */ | ||
| if (left < _dst->clip.left) | ||
| left = _dst->clip.left; | ||
| if (right > _dst->clip.right) | ||
| right = _dst->clip.right; | ||
| if (top < _dst->clip.top) | ||
| top = _dst->clip.top; | ||
| if (bottom > _dst->clip.bottom) | ||
| bottom = _dst->clip.bottom; | ||
|
|
||
| pixman_image_t *dst = create_pixman_image_from_twin_pixmap(_dst); | ||
| pixman_color_t color; | ||
| twin_argb32_to_pixman_color(pixel, &color); | ||
| pixman_image_fill_rectangles( | ||
| twin_to_pixman_op(operator), dst, &color, 1, | ||
| &(pixman_rectangle16_t){left, top, right - left, bottom - top}); | ||
|
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| twin_pixmap_damage(_dst, left, top, right, bottom); | ||
|
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| pixman_image_unref(dst); | ||
| } | ||
|
|
||
| /* Same function in draw.c */ | ||
| static twin_argb32_t _twin_apply_alpha(twin_argb32_t v) | ||
| { | ||
| uint16_t t1, t2, t3; | ||
| twin_a8_t alpha = twin_get_8(v, | ||
| #if __BYTE_ORDER == __BIG_ENDIAN | ||
| 0 | ||
| #else | ||
| 24 | ||
| #endif | ||
| ); | ||
|
|
||
| /* clear RGB data if alpha is zero */ | ||
| if (!alpha) | ||
| return 0; | ||
|
|
||
| #if __BYTE_ORDER == __BIG_ENDIAN | ||
| /* twin needs ARGB format */ | ||
| return alpha << 24 | twin_int_mult(twin_get_8(v, 24), alpha, t1) << 16 | | ||
| twin_int_mult(twin_get_8(v, 16), alpha, t2) << 8 | | ||
| twin_int_mult(twin_get_8(v, 8), alpha, t3) << 0; | ||
| #else | ||
| return alpha << 24 | twin_int_mult(twin_get_8(v, 0), alpha, t1) << 16 | | ||
| twin_int_mult(twin_get_8(v, 8), alpha, t2) << 8 | | ||
| twin_int_mult(twin_get_8(v, 16), alpha, t3) << 0; | ||
| #endif | ||
| } | ||
|
|
||
| void twin_premultiply_alpha(twin_pixmap_t *px) | ||
| { | ||
| int x, y; | ||
| twin_pointer_t p; | ||
|
|
||
| if (px->format != TWIN_ARGB32) | ||
| return; | ||
|
|
||
| for (y = 0; y < px->height; y++) { | ||
| p.b = px->p.b + y * px->stride; | ||
|
|
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| for (x = 0; x < px->width; x++) | ||
| p.argb32[x] = _twin_apply_alpha(p.argb32[x]); | ||
| } | ||
| } |
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