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gterm: Reintroduce fast canvas drawing, only.

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Co-authored-by: StaticSaga <61866965+StaticSaga@users.noreply.github.com>
This commit is contained in:
mintsuki 2021-07-11 07:28:09 +02:00
parent f4dc6481f1
commit e5ec3c1fb3
4 changed files with 109 additions and 84 deletions
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61
stage23/lib/bmp.c
View File

@ -28,46 +28,6 @@ struct bmp_header {
uint32_t blue_mask;
} __attribute__((packed));
struct bmp_local {
uint8_t *image;
uint32_t pitch;
struct bmp_header header;
};
static uint32_t get_pixel(struct image *this, int x, int y) {
struct bmp_local *local = this->local;
struct bmp_header *header = &local->header;
switch (this->type) {
case IMAGE_TILED: {
x %= header->bi_width;
y %= header->bi_height;
break;
}
case IMAGE_CENTERED: {
x -= this->x_displacement;
y -= this->y_displacement;
if (x < 0 || y < 0 || x >= this->x_size || y >= this->y_size)
return this->back_colour;
break;
}
case IMAGE_STRETCHED: {
x = (x * this->old_x_size) / this->x_size;
y = (y * this->old_y_size) / this->y_size;
break;
}
}
size_t pixel_offset = local->pitch * (header->bi_height - y - 1) + x * (header->bi_bpp / 8);
// TODO: Perhaps use masks here, they're there for a reason
uint32_t composite = 0;
for (int i = 0; i < header->bi_bpp / 8; i++)
composite |= (uint32_t)local->image[pixel_offset + i] << (i * 8);
return composite;
}
int bmp_open_image(struct image *image, struct file_handle *file) {
struct bmp_header header;
fread(file, &header, 0, sizeof(struct bmp_header));
@ -76,21 +36,18 @@ int bmp_open_image(struct image *image, struct file_handle *file) {
return -1;
// We don't support bpp lower than 8
if (header.bi_bpp < 8)
if (header.bi_bpp % 8 != 0)
return -1;
struct bmp_local *local = ext_mem_alloc(sizeof(struct bmp_local));
image->img = ext_mem_alloc(header.bf_size);
fread(file, image->img, header.bf_offset, header.bf_size);
local->image = ext_mem_alloc(header.bf_size);
fread(file, local->image, header.bf_offset, header.bf_size);
local->pitch = ALIGN_UP(header.bi_width * header.bi_bpp, 32) / 8;
local->header = header;
image->x_size = header.bi_width;
image->y_size = header.bi_height;
image->get_pixel = get_pixel;
image->local = local;
image->x_size = header.bi_width;
image->y_size = header.bi_height;
image->pitch = ALIGN_UP(header.bi_width * header.bi_bpp, 32) / 8;
image->bpp = header.bi_bpp;
image->img_width = header.bi_width;
image->img_height = header.bi_height;
return 0;
}

110
stage23/lib/gterm.c
View File

@ -74,17 +74,7 @@ void gterm_plot_px(int x, int y, uint32_t hex) {
gterm_framebuffer[fb_i] = hex;
}
static uint32_t blend_gradient_from_box(int x, int y, uint32_t hex) {
if (x >= frame_width && x < frame_width + VGA_FONT_WIDTH * cols
&& y >= frame_height && y < frame_height + VGA_FONT_HEIGHT * rows) {
return colour_blend(hex, background->get_pixel(background, x, y));
}
uint32_t bg_px = background->get_pixel(background, x, y);
if (margin_gradient == 0)
return bg_px;
static uint32_t blend_gradient_from_box(int x, int y, uint32_t bg_px, uint32_t hex) {
int distance, x_distance, y_distance;
if (x < frame_width)
@ -115,14 +105,100 @@ static uint32_t blend_gradient_from_box(int x, int y, uint32_t hex) {
return colour_blend((hex & 0xffffff) | (new_alpha << 24), bg_px);
}
void gterm_generate_canvas(void) {
if (background) {
for (int y = 0; y < gterm_height; y++) {
for (int x = 0; x < gterm_width; x++) {
bg_canvas[y * gterm_width + x] = blend_gradient_from_box(x, y, ansi_colours[8]);
gterm_plot_px(x, y, bg_canvas[y * gterm_width + x]);
typedef int fixedp6; // the last 6 bits are the fixed point part
static int fixedp6_to_int(fixedp6 value) { return value / 64; }
static fixedp6 int_to_fixedp6(int value) { return value * 64; }
// Draw rect at coordinates, copying from the image to the fb and canvas, applying fn on every pixel
__attribute__((always_inline)) static inline void genloop(int xstart, int xend, int ystart, int yend, uint32_t (*blend)(int x, int y, uint32_t orig)) {
uint8_t *img = background->img;
const int img_width = background->img_width, img_height = background->img_height, img_pitch = background->pitch, colsize = background->bpp / 8;
switch (background->type) {
case IMAGE_TILED:
for (int y = ystart; y < yend; y++) {
int image_y = y % img_height, image_x = xstart % img_width;
const size_t off = img_pitch * (img_height - 1 - image_y);
int canvas_off = gterm_width * y, fb_off = gterm_pitch / 4 * y;
for (int x = xstart; x < xend; x++) {
uint32_t img_pixel = *(uint32_t*)(img + image_x * colsize + off);
uint32_t i = blend(x, y, img_pixel);
bg_canvas[canvas_off + x] = i; gterm_framebuffer[fb_off + x] = i;
if (image_x++ == img_width) image_x = 0; // image_x = x % img_width, but modulo is too expensive
}
}
break;
case IMAGE_CENTERED:
for (int y = ystart; y < yend; y++) {
int image_y = y - background->y_displacement;
const size_t off = img_pitch * (img_height - 1 - image_y);
int canvas_off = gterm_width * y, fb_off = gterm_pitch / 4 * y;
if ((image_y < 0) || (image_y >= background->y_size)) { /* external part */
for (int x = xstart; x < xend; x++) {
uint32_t i = blend(x, y, background->back_colour);
bg_canvas[canvas_off + x] = i; gterm_framebuffer[fb_off + x] = i;
}
}
else { /* internal part */
for (int x = xstart; x < xend; x++) {
int image_x = (x - background->x_displacement);
bool x_external = (image_x < 0) || (image_x >= background->x_size);
uint32_t img_pixel = *(uint32_t*)(img + image_x * colsize + off);
uint32_t i = blend(x, y, x_external ? background->back_colour : img_pixel);
bg_canvas[canvas_off + x] = i; gterm_framebuffer[fb_off + x] = i;
}
}
}
break;
// For every pixel, ratio = img_width / gterm_width, img_x = x * ratio, x = (xstart + i)
// hence x = xstart * ratio + i * ratio
// so you can set x = xstart * ratio, and increment by ratio at each iteration
case IMAGE_STRETCHED:
for (int y = ystart; y < yend; y++) {
int img_y = (y * img_height) / gterm_height; // calculate Y with full precision
int off = img_pitch * (img_height - 1 - img_y);
int canvas_off = gterm_width * y, fb_off = gterm_pitch / 4 * y;
size_t ratio = int_to_fixedp6(img_width) / gterm_width;
fixedp6 img_x = ratio * xstart;
for (int x = xstart; x < xend; x++) {
uint32_t img_pixel = *(uint32_t*)(img + fixedp6_to_int(img_x) * colsize + off);
uint32_t i = blend(x, y, img_pixel);
bg_canvas[canvas_off + x] = i; gterm_framebuffer[fb_off + x] = i;
img_x += ratio;
}
}
break;
}
}
static uint32_t blend_external(int x, int y, uint32_t orig) { (void)x; (void)y; return orig; }
static uint32_t blend_internal(int x, int y, uint32_t orig) { (void)x; (void)y; return colour_blend(ansi_colours[8], orig); }
static uint32_t blend_margin(int x, int y, uint32_t orig) { return blend_gradient_from_box(x, y, orig, ansi_colours[8]); }
static void loop_external(int xstart, int xend, int ystart, int yend) { genloop(xstart, xend, ystart, yend, blend_external); }
static void loop_margin(int xstart, int xend, int ystart, int yend) { genloop(xstart, xend, ystart, yend, blend_margin); }
static void loop_internal(int xstart, int xend, int ystart, int yend) { genloop(xstart, xend, ystart, yend, blend_internal); }
void gterm_generate_canvas(void) {
if (background) {
const int frame_height_end = frame_height + VGA_FONT_HEIGHT * rows, frame_width_end = frame_width + VGA_FONT_WIDTH * cols;
const int fheight = frame_height - margin_gradient, fheight_end = frame_height_end + margin_gradient,
fwidth = frame_width - margin_gradient, fwidth_end = frame_width_end + margin_gradient;
loop_external(0, gterm_width, 0, fheight);
loop_external(0, gterm_width, fheight_end, gterm_height);
loop_external(0, fwidth, fheight, fheight_end);
loop_external(fwidth_end, gterm_width, fheight, fheight_end);
if (margin_gradient) {
loop_margin(fwidth, fwidth_end, fheight, frame_height);
loop_margin(fwidth, fwidth_end, frame_height_end, fheight_end);
loop_margin(fwidth, frame_width, frame_height, frame_height_end);
loop_margin(frame_width_end, fwidth_end, frame_height, frame_height_end);
}
loop_internal(frame_width, frame_width_end, frame_height, frame_height_end);
} else {
for (int y = 0; y < gterm_height; y++) {
for (int x = 0; x < gterm_width; x++) {

3
stage23/lib/image.c
View File

@ -17,9 +17,6 @@ void image_make_centered(struct image *image, int frame_x_size, int frame_y_size
void image_make_stretched(struct image *image, int new_x_size, int new_y_size) {
image->type = IMAGE_STRETCHED;
image->old_x_size = image->x_size;
image->old_y_size = image->y_size;
image->x_size = new_x_size;
image->y_size = new_y_size;
}

19
stage23/lib/image.h
View File

@ -9,19 +9,14 @@ struct image {
int x_size;
int y_size;
int type;
union {
struct {
int x_displacement;
int y_displacement;
};
struct {
int old_x_size;
int old_y_size;
};
};
uint8_t *img;
int bpp;
int pitch;
int img_width; // x_size = scaled size, img_width = bitmap size
int img_height;
int x_displacement;
int y_displacement;
uint32_t back_colour;
uint32_t (*get_pixel)(struct image *this, int x, int y);
void *local;
};
enum {