Bug 96448 – [CSS Shaders] Add CustomFilterProgramType to CustomFilterProgramInfo

• Component: Layout and Rendering
• Status: RESOLVED FIXED

[Max Vujovic]

In the CSS Shaders implementation, we frequently make a decision based on programInfo.mixSettings.enabled. It would be nice if we used a CustomFilterProgramType enum in CustomFilterProgramInfo instead. Then, we could remove mixSettings.enabled. The enum would look something like:

enum CustomFilterProgramType {
    PROGRAM_TYPE_NO_ELEMENT_TEXTURE,
    PROGRAM_TYPE_BLENDS_ELEMENT_TEXTURE
}

[Michelangelo De Simone]

Created attachment 168083 [details]
Not for review

[Max Vujovic]

Comment on attachment 168083 [details]
Not for review

Looks good! Here's my informal review- just a couple of nits.

View in context: https://bugs.webkit.org/attachment.cgi?id=168083&action=review

> Source/WebCore/ChangeLog:8
> +        Refactor of CustomFilterProgramInfo: MixSettings and related program type

Can you be more specific? For example:
Remove CustomFilterProgramMixSettings.enabled and check against CustomFilterProgram.programType() instead. Add m_programType to CustomFilterProgram and CustomFilterProgramInfo.

> Source/WebCore/css/CSSComputedStyleDeclaration.cpp:925
> +            if (isMixEnabled) {

I would put the boolean expression in here without the extra variable.

> Source/WebCore/platform/graphics/filters/CustomFilterProgram.cpp:41
> +CustomFilterProgram::CustomFilterProgram(CustomFilterProgramType programType, CustomFilterProgramMixSettings mixSettings)

While you're touching this line, can you make CustomFilterProgramMixSettings a const reference?

> Source/WebCore/platform/graphics/filters/CustomFilterProgram.h:78
> +    CustomFilterProgram(CustomFilterProgramType, CustomFilterProgramMixSettings);

Ditto.

> Source/WebCore/platform/graphics/filters/CustomFilterProgramInfo.cpp:84
> +        m_programType == PROGRAM_TYPE_BLENDS_ELEMENT_TEXTURE,

Can you factor out this expression as a local boolean since we check it multiple times? Maybe like this:
bool blendsElementTexture = (m_programType == PROGRAM_TYPE_BLENDS_ELEMENT_TEXTURE);

> Source/WebCore/platform/graphics/filters/CustomFilterProgramInfo.cpp:98
>          && m_mixSettings == o.m_mixSettings;

We should only check m_mixSettings for equality if m_programType is PROGRAM_TYPE_BLENDS_ELEMENT_TEXTURE.

> Source/WebCore/platform/graphics/filters/CustomFilterValidatedProgram.cpp:86
> +    bool isMixEnabled = programInfo.programType() == PROGRAM_TYPE_BLENDS_ELEMENT_TEXTURE;

Instead of "isMixEnabled", can we call this boolean "blendsElementTexture"?

> Source/WebCore/rendering/style/StyleCustomFilterProgram.h:48
> +    static PassRefPtr<StyleCustomFilterProgram> create(PassRefPtr<StyleShader> vertexShader, PassRefPtr<StyleShader> fragmentShader, CustomFilterProgramType programType, CustomFilterProgramMixSettings mixSettings)

const CustomFilterProgramMixSettings&

> Source/WebCore/rendering/style/StyleCustomFilterProgram.h:129
> +    StyleCustomFilterProgram(PassRefPtr<StyleShader> vertexShader, PassRefPtr<StyleShader> fragmentShader, CustomFilterProgramType programType, CustomFilterProgramMixSettings mixSettings)

const CustomFilterProgramMixSettings&

[Michelangelo De Simone]

Created attachment 168304 [details]
Patch

[Kenneth Rohde Christiansen]

Comment on attachment 168304 [details]
Patch

View in context: https://bugs.webkit.org/attachment.cgi?id=168304&action=review

> Source/WebCore/ChangeLog:11
> +        CustomFilterProgramInfo has been refactored to decouple the CustomFilterProgramType from
> +        the CustomFilterProgramMixSettings, therefore CustomFilterProgramSettings.enabled has been
> +        removed, now we explicitely check for the programType(). m_program has also been added to
> +        CustomFilterProgram (and CustomFilterProgramInfo).

would be good if you told why, and why this is an improvement, instead of what you just did

> Source/WebCore/ChangeLog:13
> +        No test necessary. 

Why? covered by existing tests? Just refactoring?

> Source/WebCore/ChangeLog:38
> +        * css/CSSComputedStyleDeclaration.cpp:
> +        (WebCore::CSSComputedStyleDeclaration::valueForFilter):
> +        * css/StyleResolver.cpp:
> +        (WebCore::StyleResolver::createCustomFilterOperation):
> +        * platform/graphics/filters/CustomFilterProgram.cpp:
> +        (WebCore::CustomFilterProgram::CustomFilterProgram):
> +        (WebCore::CustomFilterProgram::programInfo):
> +        * platform/graphics/filters/CustomFilterProgram.h:
> +        * platform/graphics/filters/CustomFilterProgramInfo.cpp:
> +        (WebCore::CustomFilterProgramInfo::CustomFilterProgramInfo):
> +        (WebCore::CustomFilterProgramInfo::hash):
> +        (WebCore::CustomFilterProgramInfo::operator==):
> +        * platform/graphics/filters/CustomFilterProgramInfo.h:
> +        (WebCore::CustomFilterProgramMixSettings::CustomFilterProgramMixSettings):
> +        (WebCore::CustomFilterProgramMixSettings::operator==):
> +        (CustomFilterProgramInfo):
> +        (WebCore::CustomFilterProgramInfo::programType):
> +        * platform/graphics/filters/CustomFilterValidatedProgram.cpp:
> +        (WebCore::CustomFilterValidatedProgram::CustomFilterValidatedProgram):
> +        (WebCore::CustomFilterValidatedProgram::rewriteMixVertexShader):
> +        (WebCore::CustomFilterValidatedProgram::rewriteMixFragmentShader):
> +        * rendering/style/StyleCustomFilterProgram.h:
> +        (WebCore::StyleCustomFilterProgram::create):
> +        (WebCore::StyleCustomFilterProgram::StyleCustomFilterProgram):

Some times it can be good adding more detailed comments here

[Max Vujovic]

Comment on attachment 168304 [details]
Patch

View in context: https://bugs.webkit.org/attachment.cgi?id=168304&action=review

> Source/WebCore/ChangeLog:10
> +        removed, now we explicitely check for the programType(). m_program has also been added to

Nit: I think you meant "m_programType", not "m_program".

[Michelangelo De Simone]

Created attachment 168498 [details]
Patch

[Kenneth Rohde Christiansen]

Comment on attachment 168498 [details]
Patch

View in context: https://bugs.webkit.org/attachment.cgi?id=168498&action=review

LGTM but others might have comments

> Source/WebCore/ChangeLog:23
> +        reflect the need of setting the program type explicitely.

spelling

> Source/WebCore/ChangeLog:25
> +        type explicitely.

explicitly*

> Source/WebCore/ChangeLog:30
> +        (WebCore::CustomFilterProgramInfo::operator==): MixSetings' equality check is being performed only whether

Settings*

[Michelangelo De Simone]

(In reply to comment #7)

> LGTM but others might have comments

Cool, thanks a lot!

[Michelangelo De Simone]

Created attachment 168729 [details]
Patch for landing

[WebKit Review Bot]

Comment on attachment 168729 [details]
Patch for landing

Clearing flags on attachment: 168729

Committed r131357: <http://trac.webkit.org/changeset/131357>

[WebKit Review Bot]

All reviewed patches have been landed.  Closing bug.