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v/vlib/gg/image.c.v

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// Copyright (c) 2019-2022 Alexander Medvednikov. All rights reserved.
// Use of this source code is governed by an MIT license that can be found in the LICENSE file.
module gg
import os
import stbi
import sokol.gfx
import sokol.sgl
// Image holds the fileds and data needed to
// represent a bitmap/pixel based image in memory.
[heap]
pub struct Image {
pub mut:
id int
width int
height int
nr_channels int
ok bool
data voidptr
ext string
simg_ok bool
simg gfx.Image
path string
}
// create_image creates an `Image` from `file`.
// TODO return !Image
pub fn (ctx &Context) create_image(file string) Image {
// println('\ncreate_image("$file")')
if !os.exists(file) {
return Image{}
}
$if macos {
if ctx.native_rendering {
// return C.darwin_create_image(file)
mut img := C.darwin_create_image(file)
// println('created macos image: $img.path w=$img.width')
// C.printf('p = %p\n', img.data)
img.id = ctx.image_cache.len
unsafe {
ctx.image_cache << img
}
return img
}
}
if !gfx.is_valid() {
// Sokol is not initialized yet, add stbi object to a queue/cache
// ctx.image_queue << file
stb_img := stbi.load(file) or { return Image{} }
img := Image{
width: stb_img.width
height: stb_img.height
nr_channels: stb_img.nr_channels
ok: false
data: stb_img.data
ext: stb_img.ext
path: file
id: ctx.image_cache.len
}
unsafe {
ctx.image_cache << img
}
return img
}
mut img := create_image(file)
img.id = ctx.image_cache.len
unsafe {
ctx.image_cache << img
}
return img
}
// init_sokol_image initializes this `Image` for use with the
// sokol graphical backend system.
pub fn (mut img Image) init_sokol_image() &Image {
// println('\n init sokol image $img.path ok=$img.simg_ok')
mut img_desc := gfx.ImageDesc{
width: img.width
height: img.height
num_mipmaps: 0
wrap_u: .clamp_to_edge
wrap_v: .clamp_to_edge
label: img.path.str
d3d11_texture: 0
}
// NOTE the following code, sometimes, result in hard-to-detect visual errors/bugs:
// img_size := usize(img.nr_channels * img.width * img.height)
// As an example see https://github.com/vlang/vab/issues/239
// The image will come out blank for some reason and no SOKOL_ASSERT
// nor any CI check will/can currently catch this.
// Since all of gg currently runs with more or less *defaults* from sokol_gfx/sokol_gl
// we should currently just use the sum of each of the RGB and A channels (= 4) here instead.
// Optimized PNG images that have no alpha channel is often optimized to only have
// 3 (or less) channels which stbi will correctly detect and set as `img.nr_channels`
// but the current sokol_gl context setup expects 4. It *should* be the same with
// all other stbi supported formats.
img_size := usize(4 * img.width * img.height)
img_desc.data.subimage[0][0] = gfx.Range{
ptr: img.data
size: img_size
}
img.simg = gfx.make_image(&img_desc)
img.simg_ok = true
img.ok = true
return img
}
// draw_image draws the provided image onto the screen.
pub fn (ctx &Context) draw_image(x f32, y f32, width f32, height f32, img_ &Image) {
$if macos {
if img_.id >= ctx.image_cache.len {
eprintln('gg: draw_image() bad img id ${img_.id} (img cache len = ${ctx.image_cache.len})')
return
}
if ctx.native_rendering {
if img_.width == 0 {
return
}
if !os.exists(img_.path) {
return
}
C.darwin_draw_image(x, ctx.height - (y + height), width, height, img_)
return
}
}
ctx.draw_image_with_config(
img: img_
img_rect: Rect{x, y, width, height}
part_rect: Rect{0, 0, img_.width, img_.height}
)
}
// new_streaming_image returns a cached `image_idx` of a special image, that
// can be updated *each frame* by calling: gg.update_pixel_data(image_idx, buf)
// ... where buf is a pointer to the actual pixel data for the image.
// Note: you still need to call app.gg.draw_image after that, to actually draw it.
pub fn (mut ctx Context) new_streaming_image(w int, h int, channels int, sicfg StreamingImageConfig) int {
mut img := Image{}
img.width = w
img.height = h
img.nr_channels = channels // 4 bytes per pixel for .rgba8, see pixel_format
mut img_desc := gfx.ImageDesc{
width: img.width
height: img.height
pixel_format: sicfg.pixel_format
num_slices: 1
num_mipmaps: 1
usage: .stream
wrap_u: sicfg.wrap_u
wrap_v: sicfg.wrap_v
min_filter: sicfg.min_filter
mag_filter: sicfg.mag_filter
label: img.path.str
}
// Sokol requires that streamed images have NO .ptr/.size initially:
img_desc.data.subimage[0][0] = gfx.Range{
ptr: 0
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size: usize(0)
}
img.simg = gfx.make_image(&img_desc)
img.simg_ok = true
img.ok = true
img_idx := ctx.cache_image(img)
return img_idx
}
// update_pixel_data is a helper for working with image streams (i.e. images,
// that are updated dynamically by the CPU on each frame)
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pub fn (mut ctx Context) update_pixel_data(cached_image_idx int, buf &u8) {
mut image := ctx.get_cached_image_by_idx(cached_image_idx)
image.update_pixel_data(buf)
}
// update_pixel_data updates the sokol specific pixel data associated
// with this `Image`.
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pub fn (mut img Image) update_pixel_data(buf &u8) {
mut data := gfx.ImageData{}
data.subimage[0][0].ptr = buf
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data.subimage[0][0].size = usize(img.width * img.height * img.nr_channels)
gfx.update_image(img.simg, &data)
}
// create_image_with_size creates an `Image` from `file` in the given
// `width` x `height` dimension.
//
// TODO copypasta
pub fn (mut ctx Context) create_image_with_size(file string, width int, height int) Image {
if !gfx.is_valid() {
// Sokol is not initialized yet, add stbi object to a queue/cache
// ctx.image_queue << file
stb_img := stbi.load(file) or { return Image{} }
img := Image{
width: width
height: height
nr_channels: stb_img.nr_channels
ok: false
data: stb_img.data
ext: stb_img.ext
path: file
id: ctx.image_cache.len
}
ctx.image_cache << img
return img
}
mut img := create_image(file)
img.id = ctx.image_cache.len
ctx.image_cache << img
return img
}
// create_image creates an `Image` from `file`.
//
// TODO remove this
fn create_image(file string) Image {
if !os.exists(file) {
println('gg.create_image(): file not found: ${file}')
return Image{} // none
}
stb_img := stbi.load(file) or { return Image{} }
mut img := Image{
width: stb_img.width
height: stb_img.height
nr_channels: stb_img.nr_channels
ok: stb_img.ok
data: stb_img.data
ext: stb_img.ext
path: file
}
img.init_sokol_image()
return img
}
// create_image_from_memory creates an `Image` from the
// memory buffer `buf` of size `bufsize`.
//
// See also: create_image_from_byte_array
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pub fn (mut ctx Context) create_image_from_memory(buf &u8, bufsize int) Image {
stb_img := stbi.load_from_memory(buf, bufsize) or { return Image{} }
mut img := Image{
width: stb_img.width
height: stb_img.height
nr_channels: stb_img.nr_channels
ok: stb_img.ok
data: stb_img.data
ext: stb_img.ext
id: ctx.image_cache.len
}
ctx.image_cache << img
return img
}
// create_image_from_byte_array creates an `Image` from the
// byte array `b`.
//
// See also: create_image_from_memory
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pub fn (mut ctx Context) create_image_from_byte_array(b []u8) Image {
return ctx.create_image_from_memory(b.data, b.len)
}
pub struct StreamingImageConfig {
pixel_format gfx.PixelFormat = .rgba8
wrap_u gfx.Wrap = .clamp_to_edge
wrap_v gfx.Wrap = .clamp_to_edge
min_filter gfx.Filter = .linear
mag_filter gfx.Filter = .linear
num_mipmaps int = 1
num_slices int = 1
}
// draw_image_with_config takes in a config that details how the
// provided image should be drawn onto the screen
pub fn (ctx &Context) draw_image_with_config(config DrawImageConfig) {
id := if !isnil(config.img) { config.img.id } else { config.img_id }
if id >= ctx.image_cache.len {
eprintln('gg: draw_image() bad img id ${id} (img cache len = ${ctx.image_cache.len})')
return
}
img := &ctx.image_cache[id]
if !img.simg_ok {
return
}
mut img_rect := config.img_rect
if img_rect.width == 0 && img_rect.height == 0 {
img_rect = Rect{img_rect.x, img_rect.y, img.width, img.height}
}
mut part_rect := config.part_rect
if part_rect.width == 0 && part_rect.height == 0 {
part_rect = Rect{part_rect.x, part_rect.y, img.width, img.height}
}
u0 := part_rect.x / img.width
v0 := part_rect.y / img.height
u1 := (part_rect.x + part_rect.width) / img.width
v1 := (part_rect.y + part_rect.height) / img.height
x0 := img_rect.x * ctx.scale
y0 := img_rect.y * ctx.scale
x1 := (img_rect.x + img_rect.width) * ctx.scale
mut y1 := (img_rect.y + img_rect.height) * ctx.scale
if img_rect.height == 0 {
scale := f32(img.width) / f32(img_rect.width)
y1 = f32(img_rect.y + int(f32(img.height) / scale)) * ctx.scale
}
flip_x := config.flip_x
flip_y := config.flip_y
mut u0f := if !flip_x { u0 } else { u1 }
mut u1f := if !flip_x { u1 } else { u0 }
mut v0f := if !flip_y { v0 } else { v1 }
mut v1f := if !flip_y { v1 } else { v0 }
// FIXME: is this okay?
match config.effect {
.alpha { sgl.load_pipeline(ctx.pipeline.alpha) }
.add { sgl.load_pipeline(ctx.pipeline.add) }
}
sgl.enable_texture()
sgl.texture(img.simg)
if config.rotate != 0 {
width := img_rect.width * ctx.scale
height := (if img_rect.height > 0 { img_rect.height } else { img.height }) * ctx.scale
sgl.push_matrix()
sgl.translate(x0 + (width / 2), y0 + (height / 2), 0)
sgl.rotate(sgl.rad(-config.rotate), 0, 0, 1)
sgl.translate(-x0 - (width / 2), -y0 - (height / 2), 0)
}
sgl.begin_quads()
sgl.c4b(config.color.r, config.color.g, config.color.b, config.color.a)
sgl.v3f_t2f(x0, y0, config.z, u0f, v0f)
sgl.v3f_t2f(x1, y0, config.z, u1f, v0f)
sgl.v3f_t2f(x1, y1, config.z, u1f, v1f)
sgl.v3f_t2f(x0, y1, config.z, u0f, v1f)
sgl.end()
if config.rotate != 0 {
sgl.pop_matrix()
}
sgl.disable_texture()
}