diff options
Diffstat (limited to 'components/script/dom/webglrenderingcontext.rs')
| -rw-r--r-- | components/script/dom/webglrenderingcontext.rs | 71 |
1 files changed, 67 insertions, 4 deletions
diff --git a/components/script/dom/webglrenderingcontext.rs b/components/script/dom/webglrenderingcontext.rs index ecef53bd069..ca38df1e442 100644 --- a/components/script/dom/webglrenderingcontext.rs +++ b/components/script/dom/webglrenderingcontext.rs @@ -2,6 +2,7 @@ * License, v. 2.0. If a copy of the MPL was not distributed with this * file, You can obtain one at http://mozilla.org/MPL/2.0/. */ +use byteorder::{NativeEndian, WriteBytesExt}; use canvas_traits::{CanvasCommonMsg, CanvasMsg, byte_swap}; use core::nonzero::NonZero; use dom::bindings::codegen::Bindings::WebGLRenderingContextBinding::{self, WebGLContextAttributes}; @@ -364,6 +365,67 @@ impl WebGLRenderingContext { true } + /// Translates an image in rgba8 (red in the first byte) format to + /// the format that was requested of TexImage. + /// + /// From the WebGL 1.0 spec, 5.14.8: + /// + /// "The source image data is conceptually first converted to + /// the data type and format specified by the format and type + /// arguments, and then transferred to the WebGL + /// implementation. If a packed pixel format is specified + /// which would imply loss of bits of precision from the image + /// data, this loss of precision must occur." + fn rgba8_image_to_tex_image_data(&self, + format: TexFormat, + data_type: TexDataType, + pixels: Vec<u8>) -> Vec<u8> { + // hint for vector allocation sizing. + let pixel_count = pixels.len() / 4; + + match (format, data_type) { + (TexFormat::RGBA, TexDataType::UnsignedByte) => pixels, + (TexFormat::RGB, TexDataType::UnsignedByte) => pixels, + + (TexFormat::RGBA, TexDataType::UnsignedShort4444) => { + let mut rgba4 = Vec::<u8>::with_capacity(pixel_count * 2); + for rgba8 in pixels.chunks(4) { + rgba4.write_u16::<NativeEndian>((rgba8[0] as u16 & 0xf0) << 8 | + (rgba8[1] as u16 & 0xf0) << 4 | + (rgba8[2] as u16 & 0xf0) | + (rgba8[3] as u16 & 0xf0) >> 4).unwrap(); + } + rgba4 + } + + (TexFormat::RGBA, TexDataType::UnsignedShort5551) => { + let mut rgba5551 = Vec::<u8>::with_capacity(pixel_count * 2); + for rgba8 in pixels.chunks(4) { + rgba5551.write_u16::<NativeEndian>((rgba8[0] as u16 & 0xf8) << 8 | + (rgba8[1] as u16 & 0xf8) << 3 | + (rgba8[2] as u16 & 0xf8) >> 2 | + (rgba8[3] as u16) >> 7).unwrap(); + } + rgba5551 + } + + (TexFormat::RGB, TexDataType::UnsignedShort565) => { + let mut rgb565 = Vec::<u8>::with_capacity(pixel_count * 2); + for rgba8 in pixels.chunks(4) { + rgb565.write_u16::<NativeEndian>((rgba8[0] as u16 & 0xf8) << 8 | + (rgba8[1] as u16 & 0xfc) << 3 | + (rgba8[2] as u16 & 0xf8) >> 3).unwrap(); + } + rgb565 + } + + // Validation should have ensured that we only hit the + // above cases, but we haven't turned the (format, type) + // into an enum yet so there's a default case here. + _ => unreachable!() + } + } + fn get_image_pixels(&self, source: Option<ImageDataOrHTMLImageElementOrHTMLCanvasElementOrHTMLVideoElement>) -> ImagePixelResult { @@ -398,10 +460,7 @@ impl WebGLRenderingContext { let size = Size2D::new(img.width as i32, img.height as i32); - // TODO(emilio): Validate that the format argument - // is coherent with the image. - // - // RGB8 should be easy to support too + // For now Servo's images are all stored as RGBA8 internally. let mut data = match img.format { PixelFormat::RGBA8 => img.bytes.to_vec(), _ => unimplemented!(), @@ -2690,6 +2749,8 @@ impl WebGLRenderingContextMethods for WebGLRenderingContext { Err(_) => return Ok(()), // NB: The validator sets the correct error for us. }; + let pixels = self.rgba8_image_to_tex_image_data(format, data_type, pixels); + self.tex_image_2d(texture, target, data_type, format, level, width, height, border, pixels); Ok(()) @@ -2794,6 +2855,8 @@ impl WebGLRenderingContextMethods for WebGLRenderingContext { Err(_) => return Ok(()), // NB: The validator sets the correct error for us. }; + let pixels = self.rgba8_image_to_tex_image_data(format, data_type, pixels); + self.tex_sub_image_2d(texture, target, level, xoffset, yoffset, width, height, format, data_type, pixels); Ok(()) |