/* ply-pixel-buffer.c - pixelbuffer abstraction * * Copyright (C) 2006, 2007, 2008, 2009 Red Hat, Inc. * 2008 Charlie Brej * * 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, 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, write to the Free Software * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA * 02111-1307, USA. * * Written by: Charlie Brej * Kristian Høgsberg * Ray Strode */ #include "config.h" #include "ply-list.h" #include "ply-pixel-buffer.h" #include "ply-logger.h" #include #include #include #include #include #include #include #include #include struct _ply_pixel_buffer { uint32_t *bytes; ply_rectangle_t area; ply_list_t *clip_areas; ply_region_t *updated_areas; }; static inline void ply_pixel_buffer_blend_value_at_pixel (ply_pixel_buffer_t *buffer, int x, int y, uint32_t pixel_value); static void ply_pixel_buffer_fill_area_with_pixel_value (ply_pixel_buffer_t *buffer, ply_rectangle_t *fill_area, uint32_t pixel_value); __attribute__((__pure__)) static inline uint32_t blend_two_pixel_values (uint32_t pixel_value_1, uint32_t pixel_value_2) { if ((pixel_value_2 & 0xff000000) == 0xff000000) { uint8_t alpha_1, red_1, green_1, blue_1; uint8_t red_2, green_2, blue_2; uint_least16_t red, green, blue; alpha_1 = (uint8_t) (pixel_value_1 >> 24); red_1 = (uint8_t) (pixel_value_1 >> 16); green_1 = (uint8_t) (pixel_value_1 >> 8); blue_1 = (uint8_t) pixel_value_1; red_2 = (uint8_t) (pixel_value_2 >> 16); green_2 = (uint8_t) (pixel_value_2 >> 8); blue_2 = (uint8_t) pixel_value_2; red = red_1 * 255 + red_2 * (255 - alpha_1); green = green_1 * 255 + green_2 * (255 - alpha_1); blue = blue_1 * 255 + blue_2 * (255 - alpha_1); red = (uint8_t) ((red + (red >> 8) + 0x80) >> 8); green = (uint8_t) ((green + (green >> 8) + 0x80) >> 8); blue = (uint8_t) ((blue + (blue >> 8) + 0x80) >> 8); return 0xff000000 | (red << 16) | (green << 8) | blue; } else { uint8_t alpha_1, red_1, green_1, blue_1; uint8_t alpha_2, red_2, green_2, blue_2; uint_least32_t alpha, red, green, blue; alpha_1 = (uint8_t) (pixel_value_1 >> 24); red_1 = (uint8_t) (pixel_value_1 >> 16); green_1 = (uint8_t) (pixel_value_1 >> 8); blue_1 = (uint8_t) pixel_value_1; alpha_2 = (uint8_t) (pixel_value_2 >> 24); red_2 = (uint8_t) (pixel_value_2 >> 16); green_2 = (uint8_t) (pixel_value_2 >> 8); blue_2 = (uint8_t) pixel_value_2; red = red_1 * alpha_1 + red_2 * alpha_2 * (255 - alpha_1); green = green_1 * alpha_1 + green_2 * alpha_2 * (255 - alpha_1); blue = blue_1 * alpha_1 + blue_2 * alpha_2 * (255 - alpha_1); alpha = alpha_1 * 255 + alpha_2 * (255 - alpha_1); red = (red + (red >> 8) + 0x80) >> 8; red = MIN (red, 0xff); green = (green + (green >> 8) + 0x80) >> 8; green = MIN (green, 0xff); blue = (blue + (blue >> 8) + 0x80) >> 8; blue = MIN (blue, 0xff); alpha = (alpha + (alpha >> 8) + 0x80) >> 8; alpha = MIN (alpha, 0xff); return (alpha << 24) | (red << 16) | (green << 8) | blue; } } __attribute__((__pure__)) static inline uint32_t make_pixel_value_translucent (uint32_t pixel_value, uint8_t opacity) { uint_least16_t alpha, red, green, blue; if (opacity == 255) return pixel_value; alpha = (uint8_t) (pixel_value >> 24); red = (uint8_t) (pixel_value >> 16); green = (uint8_t) (pixel_value >> 8); blue = (uint8_t) pixel_value; red *= opacity; green *= opacity; blue *= opacity; alpha *= opacity; red = (uint8_t) ((red + (red >> 8) + 0x80) >> 8); green = (uint8_t) ((green + (green >> 8) + 0x80) >> 8); blue = (uint8_t) ((blue + (blue >> 8) + 0x80) >> 8); alpha = (uint8_t) ((alpha + (alpha >> 8) + 0x80) >> 8); return (alpha << 24) | (red << 16) | (green << 8) | blue; } static inline void ply_pixel_buffer_blend_value_at_pixel (ply_pixel_buffer_t *buffer, int x, int y, uint32_t pixel_value) { uint32_t old_pixel_value; if ((pixel_value >> 24) != 0xff) { old_pixel_value = buffer->bytes[y * buffer->area.width + x]; pixel_value = blend_two_pixel_values (pixel_value, old_pixel_value); } buffer->bytes[y * buffer->area.width + x] = pixel_value; } static void ply_pixel_buffer_crop_area_to_clip_area (ply_pixel_buffer_t *buffer, ply_rectangle_t *area, ply_rectangle_t *cropped_area) { ply_list_node_t *node; *cropped_area = *area; node = ply_list_get_first_node (buffer->clip_areas); while (node != NULL) { ply_list_node_t *next_node; ply_rectangle_t *clip_rectangle; clip_rectangle = ply_list_node_get_data (node); next_node = ply_list_get_next_node (buffer->clip_areas, node); ply_rectangle_intersect (cropped_area, clip_rectangle, cropped_area); node = next_node; } } static void ply_pixel_buffer_fill_area_with_pixel_value (ply_pixel_buffer_t *buffer, ply_rectangle_t *fill_area, uint32_t pixel_value) { unsigned long row, column; ply_rectangle_t cropped_area; ply_pixel_buffer_crop_area_to_clip_area (buffer, fill_area, &cropped_area); for (row = cropped_area.y; row < cropped_area.y + cropped_area.height; row++) { for (column = cropped_area.x; column < cropped_area.x + cropped_area.width; column++) { ply_pixel_buffer_blend_value_at_pixel (buffer, column, row, pixel_value); } } } void ply_pixel_buffer_push_clip_area (ply_pixel_buffer_t *buffer, ply_rectangle_t *clip_area) { ply_rectangle_t *new_clip_area; new_clip_area = malloc (sizeof (*new_clip_area)); *new_clip_area = *clip_area; ply_list_append_data (buffer->clip_areas, new_clip_area); } void ply_pixel_buffer_pop_clip_area (ply_pixel_buffer_t *buffer) { ply_list_node_t *last_node; last_node = ply_list_get_last_node (buffer->clip_areas); free (ply_list_node_get_data (last_node)); ply_list_remove_node (buffer->clip_areas, last_node); } ply_pixel_buffer_t * ply_pixel_buffer_new (unsigned long width, unsigned long height) { ply_pixel_buffer_t *buffer; buffer = calloc (1, sizeof (ply_pixel_buffer_t)); buffer->updated_areas = ply_region_new (); buffer->bytes = (uint32_t *) calloc (height, width * sizeof (uint32_t)); buffer->area.width = width; buffer->area.height = height; buffer->clip_areas = ply_list_new (); ply_pixel_buffer_push_clip_area (buffer, &buffer->area); return buffer; } static void free_clip_areas (ply_pixel_buffer_t *buffer) { while (ply_list_get_length (buffer->clip_areas) > 0) ply_pixel_buffer_pop_clip_area (buffer); ply_list_free (buffer->clip_areas); buffer->clip_areas = NULL; } void ply_pixel_buffer_free (ply_pixel_buffer_t *buffer) { if (buffer == NULL) return; free_clip_areas (buffer); free (buffer->bytes); ply_region_free (buffer->updated_areas); free (buffer); } void ply_pixel_buffer_get_size (ply_pixel_buffer_t *buffer, ply_rectangle_t *size) { assert (buffer != NULL); assert (size != NULL); *size = buffer->area; } ply_region_t * ply_pixel_buffer_get_updated_areas (ply_pixel_buffer_t *buffer) { return buffer->updated_areas; } void ply_pixel_buffer_fill_with_gradient (ply_pixel_buffer_t *buffer, ply_rectangle_t *fill_area, uint32_t start, uint32_t end) { /* The gradient produced is a linear interpolation of the two passed * in color stops: start and end. * * In order to prevent banding when the color stops are too close * together, or are stretched over too large an area, we slightly * perturb the intermediate colors as we generate them. * * Before we do this, we store the interpolated color values in a * fixed point number with lots of fractional bits. This is so * we don't add noise after the values have been clamped to 8-bits * * We add random noise to all of the fractional bits of each color * channel and also NOISE_BITS worth of noise to the non-fractional * part of the color. By default NOISE_BITS is 1. * * We incorporate the noise by filling the bottom 24 bits of an * integer with random bits and then shifting the color channels * to the left such that the top 8 bits of the channel overlap * the noise by NOISE_BITS. E.g., if NOISE_BITS is 1, then the top * 7 bits of each channel won't overlap with the noise, and the 8th * bit + fractional bits will. When the noise and color channel * are properly aligned, we add them together, drop the precision * of the resulting channels back to 8 bits and stuff the results * into a pixel in the pixel buffer. */ #define NOISE_BITS 1 /* In the color stops, red is 8 bits starting at position 24 * (since they're argb32 pixels). * We want to move those 8 bits such that the bottom NOISE_BITS * of them overlap the top of the 24 bits of generated noise. * Of course, green and blue are 8 bits away from red and each * other, respectively. */ #define RED_SHIFT (32 - (24 + NOISE_BITS)) #define GREEN_SHIFT (RED_SHIFT + 8) #define BLUE_SHIFT (GREEN_SHIFT + 8) #define NOISE_MASK (0x00ffffff) /* Once, we've lined up the color channel we're interested in with * the noise, we need to mask out the other channels. */ #define COLOR_MASK (0xff << (24 - NOISE_BITS)) uint32_t red, green, blue, red_step, green_step, blue_step, t, pixel; uint32_t x, y; /* we use a fixed seed so that the dithering doesn't change on repaints * of the same area. */ uint32_t noise = 0x100001; ply_rectangle_t cropped_area; if (fill_area == NULL) fill_area = &buffer->area; ply_pixel_buffer_crop_area_to_clip_area (buffer, fill_area, &cropped_area); red = (start << RED_SHIFT) & COLOR_MASK; green = (start << GREEN_SHIFT) & COLOR_MASK; blue = (start << BLUE_SHIFT) & COLOR_MASK; t = (end << RED_SHIFT) & COLOR_MASK; red_step = (int32_t) (t - red) / (int32_t) buffer->area.height; t = (end << GREEN_SHIFT) & COLOR_MASK; green_step = (int32_t) (t - green) / (int32_t) buffer->area.height; t = (end << BLUE_SHIFT) & COLOR_MASK; blue_step = (int32_t) (t - blue) / (int32_t) buffer->area.height; #define RANDOMIZE(num) (num = (num + (num << 1)) & NOISE_MASK) #define UNROLLED_PIXEL_COUNT 8 for (y = buffer->area.y; y < buffer->area.y + buffer->area.height; y++) { if (cropped_area.y <= y && y < cropped_area.y + cropped_area.height) { if (cropped_area.width < UNROLLED_PIXEL_COUNT) { for (x = cropped_area.x; x < cropped_area.x + cropped_area.width; x++) { pixel = 0xff000000; RANDOMIZE(noise); pixel |= (((red + noise) & COLOR_MASK) >> RED_SHIFT); RANDOMIZE(noise); pixel |= (((green + noise) & COLOR_MASK) >> GREEN_SHIFT); RANDOMIZE(noise); pixel |= (((blue + noise) & COLOR_MASK) >> BLUE_SHIFT); buffer->bytes[y * buffer->area.width + x] = pixel; } } else { uint32_t shaded_set[UNROLLED_PIXEL_COUNT]; uint32_t *ptr = &buffer->bytes[y * buffer->area.width + cropped_area.x]; for (x = 0; x < UNROLLED_PIXEL_COUNT; x++) { shaded_set[x] = 0xff000000; RANDOMIZE(noise); shaded_set[x] |= (((red + noise) & COLOR_MASK) >> RED_SHIFT); RANDOMIZE(noise); shaded_set[x] |= (((green + noise) & COLOR_MASK) >> GREEN_SHIFT); RANDOMIZE(noise); shaded_set[x] |= (((blue + noise) & COLOR_MASK) >> BLUE_SHIFT); } for (x = cropped_area.width; x >=UNROLLED_PIXEL_COUNT; x-= UNROLLED_PIXEL_COUNT) { memcpy (ptr, (void *) shaded_set, UNROLLED_PIXEL_COUNT * sizeof (uint32_t)); ptr += UNROLLED_PIXEL_COUNT; } memcpy (ptr, (void *) shaded_set, x * sizeof (uint32_t)); } } red += red_step; green += green_step; blue += blue_step; } ply_region_add_rectangle (buffer->updated_areas, &cropped_area); } void ply_pixel_buffer_fill_with_color (ply_pixel_buffer_t *buffer, ply_rectangle_t *fill_area, double red, double green, double blue, double alpha) { uint32_t pixel_value; ply_rectangle_t cropped_area; assert (buffer != NULL); if (fill_area == NULL) fill_area = &buffer->area; ply_pixel_buffer_crop_area_to_clip_area (buffer, fill_area, &cropped_area); red *= alpha; green *= alpha; blue *= alpha; pixel_value = PLY_PIXEL_BUFFER_COLOR_TO_PIXEL_VALUE (red, green, blue, alpha); ply_pixel_buffer_fill_area_with_pixel_value (buffer, &cropped_area, pixel_value); ply_region_add_rectangle (buffer->updated_areas, &cropped_area); } void ply_pixel_buffer_fill_with_hex_color_at_opacity (ply_pixel_buffer_t *buffer, ply_rectangle_t *fill_area, uint32_t hex_color, double opacity) { ply_rectangle_t cropped_area; uint32_t pixel_value; double red; double green; double blue; double alpha; assert (buffer != NULL); if (fill_area == NULL) fill_area = &buffer->area; ply_pixel_buffer_crop_area_to_clip_area (buffer, fill_area, &cropped_area); /* if they only gave an rgb hex number, assume an alpha of 0xff */ if ((hex_color & 0xff000000) == 0) hex_color = (hex_color << 8) | 0xff; red = ((double) (hex_color & 0xff000000) / 0xff000000); green = ((double) (hex_color & 0x00ff0000) / 0x00ff0000); blue = ((double) (hex_color & 0x0000ff00) / 0x0000ff00); alpha = ((double) (hex_color & 0x000000ff) / 0x000000ff); alpha *= opacity; red *= alpha; green *= alpha; blue *= alpha; pixel_value = PLY_PIXEL_BUFFER_COLOR_TO_PIXEL_VALUE (red, green, blue, alpha); ply_pixel_buffer_fill_area_with_pixel_value (buffer, &cropped_area, pixel_value); ply_region_add_rectangle (buffer->updated_areas, &cropped_area); } void ply_pixel_buffer_fill_with_hex_color (ply_pixel_buffer_t *buffer, ply_rectangle_t *fill_area, uint32_t hex_color) { return ply_pixel_buffer_fill_with_hex_color_at_opacity (buffer, fill_area, hex_color, 1.0); } void ply_pixel_buffer_fill_with_argb32_data_at_opacity_with_clip (ply_pixel_buffer_t *buffer, ply_rectangle_t *fill_area, ply_rectangle_t *clip_area, unsigned long x, unsigned long y, uint32_t *data, double opacity) { unsigned long row, column; uint8_t opacity_as_byte; ply_rectangle_t cropped_area; assert (buffer != NULL); if (fill_area == NULL) fill_area = &buffer->area; ply_pixel_buffer_crop_area_to_clip_area (buffer, fill_area, &cropped_area); if (clip_area) ply_rectangle_intersect (&cropped_area, clip_area, &cropped_area); if (cropped_area.width == 0 || cropped_area.height == 0) return; x += cropped_area.x - fill_area->x; y += cropped_area.y - fill_area->y; opacity_as_byte = (uint8_t) (opacity * 255.0); for (row = y; row < y + cropped_area.height; row++) { for (column = x; column < x + cropped_area.width; column++) { uint32_t pixel_value; pixel_value = data[fill_area->width * row + column]; if ((pixel_value >> 24) == 0x00) continue; pixel_value = make_pixel_value_translucent (pixel_value, opacity_as_byte); ply_pixel_buffer_blend_value_at_pixel (buffer, cropped_area.x + (column - x), cropped_area.y + (row - y), pixel_value); } } ply_region_add_rectangle (buffer->updated_areas, &cropped_area); } void ply_pixel_buffer_fill_with_argb32_data_at_opacity (ply_pixel_buffer_t *buffer, ply_rectangle_t *fill_area, unsigned long x, unsigned long y, uint32_t *data, double opacity) { ply_pixel_buffer_fill_with_argb32_data_at_opacity_with_clip (buffer, fill_area, NULL, x, y, data, opacity); } void ply_pixel_buffer_fill_with_argb32_data (ply_pixel_buffer_t *buffer, ply_rectangle_t *fill_area, unsigned long x, unsigned long y, uint32_t *data) { ply_pixel_buffer_fill_with_argb32_data_at_opacity_with_clip (buffer, fill_area, NULL, x, y, data, 1.0); } void ply_pixel_buffer_fill_with_argb32_data_with_clip (ply_pixel_buffer_t *buffer, ply_rectangle_t *fill_area, ply_rectangle_t *clip_area, unsigned long x, unsigned long y, uint32_t *data) { ply_pixel_buffer_fill_with_argb32_data_at_opacity_with_clip (buffer, fill_area, clip_area, x, y, data, 1.0); } uint32_t * ply_pixel_buffer_get_argb32_data (ply_pixel_buffer_t *buffer) { return buffer->bytes; } static inline uint32_t ply_pixel_buffer_interpolate (ply_pixel_buffer_t *buffer, double x, double y) { int ix; int iy; int width; int height; int i; int offset_x; int offset_y; uint32_t pixels[2][2]; uint32_t reply = 0; uint32_t *bytes; width = buffer->area.width; height = buffer->area.height; bytes = ply_pixel_buffer_get_argb32_data (buffer); for (offset_y = 0; offset_y < 2; offset_y++) for (offset_x = 0; offset_x < 2; offset_x++) { ix = x + offset_x; iy = y + offset_y; if (ix < 0 || ix >= width || iy < 0 || iy >= height) pixels[offset_y][offset_x] = 0x00000000; else pixels[offset_y][offset_x] = bytes[ix + iy * width]; } if (!pixels[0][0] && !pixels[0][1] && !pixels[1][0] && !pixels[1][1]) return 0; ix = x; iy = y; x -= ix; y -= iy; for (i = 0; i < 4; i++) { uint32_t value = 0; uint32_t mask = 0xFF << (i * 8); value += ((pixels[0][0]) & mask) * (1-x) * (1-y); value += ((pixels[0][1]) & mask) * x * (1-y); value += ((pixels[1][0]) & mask) * (1-x) * y; value += ((pixels[1][1]) & mask) * x * y; reply |= value & mask; } return reply; } ply_pixel_buffer_t * ply_pixel_buffer_resize (ply_pixel_buffer_t *old_buffer, long width, long height) { ply_pixel_buffer_t *buffer; int x, y; double old_x, old_y; int old_width, old_height; float scale_x, scale_y; uint32_t *bytes; buffer = ply_pixel_buffer_new (width, height); bytes = ply_pixel_buffer_get_argb32_data (buffer); old_width = old_buffer->area.width; old_height = old_buffer->area.height; scale_x = ((double) old_width - 1) / MAX (width - 1, 1); scale_y = ((double) old_height - 1) / MAX (height - 1, 1); for (y = 0; y < height; y++) { old_y = y * scale_y; for (x=0; x < width; x++) { old_x = x * scale_x; bytes[x + y * width] = ply_pixel_buffer_interpolate (old_buffer, old_x, old_y); } } return buffer; } ply_pixel_buffer_t * ply_pixel_buffer_rotate (ply_pixel_buffer_t *old_buffer, long center_x, long center_y, double theta_offset) { ply_pixel_buffer_t *buffer; int x, y; double old_x, old_y; int width; int height; uint32_t *bytes; width = old_buffer->area.width; height = old_buffer->area.height; buffer = ply_pixel_buffer_new (width, height); bytes = ply_pixel_buffer_get_argb32_data (buffer); double d = sqrt ((center_x * center_x + center_y * center_y)); double theta = atan2 (-center_y, -center_x) - theta_offset; double start_x = center_x + d * cos (theta); double start_y = center_y + d * sin (theta); double step_x = cos (-theta_offset); double step_y = sin (-theta_offset); for (y = 0; y < height; y++) { old_y = start_y; old_x = start_x; start_y += step_x; start_x -= step_y; for (x = 0; x < width; x++) { if (old_x < 0 || old_x > width || old_y < 0 || old_y > height) bytes[x + y * width] = 0; else bytes[x + y * width] = ply_pixel_buffer_interpolate (old_buffer, old_x, old_y); old_x += step_x; old_y += step_y; } } return buffer; } /* vim: set ts=4 sw=4 et ai ci cino={.5s,^-2,+.5s,t0,g0,e-2,n-2,p2s,(0,=.5s,:.5s */